Operating Manual
679.B.141.04
Digital Multifunctional
Power Meter with LCD
Display and Optional
Modules
WPM 770
-1-
Contents
1.
Safety Notes ..............................................................................................................4
2.
General Information ...................................................................................................4
3.
Dimensions ................................................................................................................6
4.
Installation and Connection ........................................................................................6
4.1. Installing and connecting the meter ............................................................................6
4.2. Connection of the basic unit .......................................................................................7
4.2.1. Terminal assignment of the basic unit......................................................................7
4.2.2. Connection to the mains ..........................................................................................8
4.2.3. Connection of the RS485 interface ........................................................................10
4.2.4. Connection of the status inputs..............................................................................11
4.2.5. Connection of the relay outputs .............................................................................11
4.3. Connection of the optional modules .........................................................................12
4.3.1 Terminal assignment of the optional modules ........................................................12
4.3.2. WPM 770-EP: 2 pulse outputs ..............................................................................12
4.3.3. WPM770–S: 4 additional status inputs...................................................................13
4.3.4. WPM770–R: 2 additional relay outputs ..................................................................13
4.3.5. WPM770–AO: 2 analog outputs.............................................................................14
4.3.6. WPM770–AI: 2 analog inputs.................................................................................14
4.4. WPM770–M: Memory module ..................................................................................15
4.4.1. Functional description............................................................................................15
4.4.2. Specifications ........................................................................................................15
5.
Display and Keys .....................................................................................................16
5.1. LCD Display .............................................................................................................16
5.2. Keys and key functions ............................................................................................17
6.
Measurements .........................................................................................................18
6.1. Voltages...................................................................................................................18
6.2. Currents ...................................................................................................................18
6.3. Powers.....................................................................................................................18
6.4. Power factor.............................................................................................................18
6.5. Frequency................................................................................................................18
6.6. Energies...................................................................................................................18
6.7. Demand ...................................................................................................................19
6.8. Phase sequence ......................................................................................................20
7.
Quality Analysis........................................................................................................21
7.1. Overview..................................................................................................................21
7.2. Harmonics................................................................................................................22
7.3. Frequency deviation.................................................................................................23
7.4. Voltage deviation......................................................................................................23
-2-
Weigel Meßgeräte GmbH
P.O.B. 720 154 D–90241 Nürnberg Phone: 0911 / 4 23 47–0
Erlenstraße 14 D–90441 Nürnberg
Fax: 0911 / 4 23 47–39
Management:
Phone: 0911 / 4 23 47–94
Internet:
http://www.weigel-messgeraete.de
e-mail:
vertrieb@weigel-messgeraete.de
Operating Manual
679.B.141.04
Digital Multifunctional
Power Meter with LCD
Display and Optional
Modules
7.5. Voltage unbalance ................................................................................................... 23
8.
Displaying Measured Values.................................................................................... 24
8.1. Display after power-on ............................................................................................. 24
8.2. Menu overview for measuring values diplay ............................................................. 25
8.3. Display of the voltages (VOL) ................................................................................. 27
8.4. Display of the currents (I) ........................................................................................ 29
8.5. Display of the frequency (FRE)............................................................................... 30
8.6. Display of the powers (POWER)............................................................................. 31
8.7. Display of the energies (ENERGY) ........................................................................ 32
8.8. Display of the harmonics (EQ)................................................................................. 34
8.9. Display of the demand values (DMD) ...................................................................... 37
8.10. Display of analog inputs (ANALOG IN) - only with WPM770-AI .......................... 38
9.
Programming ........................................................................................................... 38
9.1. Start programming ................................................................................................... 38
9.2. Entering the key number (PIN)................................................................................. 39
9.3. Programming menu overview................................................................................... 40
9.4. Meter settings (METER)......................................................................................... 40
9.5. RS485 settings (COM)............................................................................................. 43
9.6. Clear data (CLEAR) ............................................................................................... 43
9.7. Relay settings (RELAY)......................................................................................... 43
9.8. Settings for analog outputs (AO) - only with WPM770-AO ....................................... 45
9.9. Setpoint settings (LIMIT)........................................................................................ 47
9.10. Error log (ERROR) .............................................................................................. 47
10. Energy Counting and Tariffs..................................................................................... 48
10.1. Energy counting .................................................................................................... 48
10.2. Tariff tables............................................................................................................ 48
11. Event Recording ...................................................................................................... 50
11.1. Relay events.......................................................................................................... 50
11.2. Frequency deviations ............................................................................................ 50
11.3. Voltage deviations ................................................................................................. 50
11.4. Voltage unbalance................................................................................................. 51
11.5. Maximum demand ................................................................................................. 51
11.6. Maximum and minimum values ............................................................................. 51
12.
Troubleshooting ....................................................................................................... 52
13.
Technical Data......................................................................................................... 53
-3-
1.
Safety Notes
Warning
• This device may only installed or maintained by personnel who have the required
technical and specialist knowledge.
• The manufacturer will not hold any responsability for damage due to disregarding this
manual.
Risk of electric hazard, fire, or explosion
• Before working on the device or equipment, disconnect all conductors of voltage inputs
and auxiliary supply from mains power. The outputs of all the current transformers must
be short-circuited.
• Use a suitable measuring device to confirm the absence of hazardous voltage.
• Put all covers and protection devices in place before energizing the equipment.
• Always supply the device with the correct rated voltage (see the label on the device).
Not observing these precautions may cause serious injuries.
2.
General Information
WPM 770 is a multi-functional power meter, integrating data acquisition and control into one
device. It can take the place of numerous meters, transducers, and other components.
• Real-time true-RMS measurement: Voltages phase to neutral and phase to phase of the
3 phases as well as mean value, minimum/maximum values, unbalance and deviation
from nominal value; currents of 3 phases and mean value, neutral current,
minimum/maximum values; phase sequence; frequency and frequency deviation; active
power, reactive power, apparent power, and power factor of the 3 phases and in total
• Programmable demand calculation for currents and powers (fixed block or moving block,
demand time can be set to 5; 10; 15; 30 min)
• Active energy and reactive energy in 4 quadrants (imported/exported,
inductive/capacitive), 4 tariffs for energies in up to 8 periods in 24 hours in 2 time zones,
working days and holiday days can be set
• Harmonic analysis of voltages, currents, powers, and energies up to the 31st harmonics
as well as total harmonic distortion (THD)
• Built - in clock and event logging
• Alarms for upper and lower setpoints
• 2 relay outputs and 3 status inputs
-4-
Weigel Meßgeräte GmbH
P.O.B. 720 154 D–90241 Nürnberg Phone: 0911 / 4 23 47–0
Erlenstraße 14 D–90441 Nürnberg
Fax: 0911 / 4 23 47–39
Management:
Phone: 0911 / 4 23 47–94
Internet:
http://www.weigel-messgeraete.de
e-mail:
vertrieb@weigel-messgeraete.de
Operating Manual
679.B.141.04
Digital Multifunctional
Power Meter with LCD
Display and Optional
Modules
• RS485 interface (Modbus-RTU)
WPM 770 can be equipped with up to 3 optional modules:
• WPM 770---EP
Optional module 2 pulse outputs
(maximum 1 module per device)
• WPM 770---S
Optional module 4 additional status inputs
(maximum 2 modules per device)
• WPM 770---R
Optional module 2 additional relay outputs
(maximum 1 module per device)
• WPM 770---M
Optional module memory extension 8 MB
• WPM 770---AO
Optional module 2 analogue outputs 4 ... 20 mA
(maximum 1 module per device)
• WPM 770---AI
Optional module 2 analogue inputs 4 ... 20 mA
(maximum 1 module per device)
• WPM 770---P
Optional module Profibus interface (on request)
(maximum 1 module per device)
• WPM 770---BA
Optional module BACnet interface (on request)
(maximum 1 module per device)
The modules can be attached to the rear of the device.
-5-
3.
Dimensions
optional module
(dimensions in mm)
4.
Installation and Connection
4.1. Installing and connecting the meter
♦ If you want to use one or more than one optional module: Press the optional module on
the rear of the meter until it snaps in. Then, fix it with the screw.
♦ Make sure that all the lines are de-energized and the outputs of the current transducers
are short-circuited.
♦ Insert the meter into the panel cutout.
♦ Fix the meter using the two plastic clips.
♦ Connect the meter according the terminal assignment (also see the print on the meter).
-6-
Weigel Meßgeräte GmbH
P.O.B. 720 154 D–90241 Nürnberg Phone: 0911 / 4 23 47–0
Erlenstraße 14 D–90441 Nürnberg
Fax: 0911 / 4 23 47–39
Management:
Phone: 0911 / 4 23 47–94
Internet:
http://www.weigel-messgeraete.de
e-mail:
vertrieb@weigel-messgeraete.de
Operating Manual
679.B.141.04
Digital Multifunctional
Power Meter with LCD
Display and Optional
Modules
♦ Insert the terminal strips into the meter and fasten the two screws of the terminal strip.
4.2.
Connection of the basic unit
4.2.1. Terminal assignment of the basic unit
9
1
10
No.
1
23
Terminal
NC
Description
not connected
No.
10
Terminal
RL21
Description
relay output 2 +
2
N/–
auxiliary supply
11
RL22
relay output 2 -
3
N/+
auxiliary supply
12
RL11
relay output 1 +
4
V1
voltage L1
13
RL12
relay output 1 -
5
V2
voltage L2
14
SG
status input ground
6
V3
voltage L3
15
S3
status input 3 +
7
VN
voltage neutral
16
S2
status input 2 +
8
RS485–
RS485 –
17
S1
status input 1 +
9
RS485+
RS485 +
18
I1+
current L1
19
I1-
current L1
20
I2+
current L2
21
I2-
current L2
22
I3+
current L3
23
I3-
current L3
-7-
4.2.2. Connection to the mains
3–phase 4–wire system, 3 CTs, voltage directly connected
3–phase 3–wire system, 3 CTs
-8-
Weigel Meßgeräte GmbH
P.O.B. 720 154 D–90241 Nürnberg Phone: 0911 / 4 23 47–0
Erlenstraße 14 D–90441 Nürnberg
Fax: 0911 / 4 23 47–39
Management:
Phone: 0911 / 4 23 47–94
Internet:
http://www.weigel-messgeraete.de
e-mail:
vertrieb@weigel-messgeraete.de
Operating Manual
679.B.141.04
Digital Multifunctional
Power Meter with LCD
Display and Optional
Modules
3–phase 3–wire system, 2 CTs
Note: The currents and the powers are measured in 4 quadrants. Pay attention to the
phase sequence of the voltage and current connections. If not connected correctly, the
currents, powers, and energies will be displayed incorrectly!
-9-
4.2.3. Connection of the RS485 interface
WPM 770 is equipped with one RS485 interface:
RS485
converter
WPM770
WPM770
WPM770
Notes:
The RS485 bus must be terminated by a 120 Ω resistor.
A maximum of 32 devices can be connected to one RS485 bus.
Without repeater, the bus length must not exceed 1200 m.
The RS485 terminals of the WPM 770 are protected against 230 V for max. 5 min. The
inputs will not be destroyed and, after powering on again, the interface will work again.
For programming see 9.5.RS485 settings (COM)
- 10 -
Weigel Meßgeräte GmbH
P.O.B. 720 154 D–90241 Nürnberg Phone: 0911 / 4 23 47–0
Erlenstraße 14 D–90441 Nürnberg
Fax: 0911 / 4 23 47–39
Management:
Phone: 0911 / 4 23 47–94
Internet:
http://www.weigel-messgeraete.de
e-mail:
vertrieb@weigel-messgeraete.de
Operating Manual
679.B.141.04
Digital Multifunctional
Power Meter with LCD
Display and Optional
Modules
4.2.4. Connection of the status inputs
WPM 770 is equipped with three status inputs which can be used, e.g. for recording switch
positions. The status inputs must be connected by switch contacts and an external supply of
80 ... 265 V AC.
~
external
supply
WPM 770
~
4.2.5. Connection of the relay outputs
WPM 770 is equipped with two relay outputs. To each relay output, the exceed or deceed of
one measuring unit can be assigned.
Setpoints upper and lower setpoint adjustable 0 ... 120%
Delay on-delay and off-delay adjustable 0 ... 99 s
Measuring unit selectable
See 9.7. Relay settings (RELAY)
When a realy output is activated, an event and a time stamp will be recorded.
Switching capacity: 250 V AC, 5 A / 30 V DC, 5 A
- 11 -
4.3.
Connection of the optional modules
4.3.1 Terminal assignment of the optional modules
4.3.2. WPM 770-EP: 2 pulse outputs
No.
Terminal
Description
1
EX P1+
pulse output for active energy +
2
EX P1–
pulse output for active energy –
3
NC
not connected
4
EX P2+
pulse output for reactive energy +
5
EX P2–
pulse output for reactive energy –
WPM770–EP is equipped with pulse outputs for active energy and for reactive energy.
The outputs provide optocoupler open–collector, max. 50 V, 50 mA
The pulse weight and the pulse length are programmable.
See 9.4. Meter settings (METER)
external supply
WPM 770-EP
- 12 -
Weigel Meßgeräte GmbH
P.O.B. 720 154 D–90241 Nürnberg Phone: 0911 / 4 23 47–0
Erlenstraße 14 D–90441 Nürnberg
Fax: 0911 / 4 23 47–39
Management:
Phone: 0911 / 4 23 47–94
Internet:
http://www.weigel-messgeraete.de
e-mail:
vertrieb@weigel-messgeraete.de
Operating Manual
679.B.141.04
Digital Multifunctional
Power Meter with LCD
Display and Optional
Modules
4.3.3. WPM770–S: 4 additional status inputs
No.
Terminal
Description
1
EX S4(S8)
status input 4 (or 8) +
2
EX S5(S9)
status input 5 (or 9) +
3
EX S6(S10)
status input 6 (or 10) +
4
EX S7(S11)
status input 7 (or 11) +
5
EX SG
status input groand
See 4.2.4. Connection of the status inputs
4.3.4. WPM770–R: 2 additional relay outputs
No.
Terminal
Description
1
RL42
relay output 4 –
2
RL41
relay output 4 +
3
NC
not connected
5
RL32
relay output 3 –
6
RL31
relay output 3 +
See 4.2.5. Connection of the relay outputs
- 13 -
4.3.5. WPM770–AO: 2 analog outputs
No.
Terminal
1
EX AO2
Description
analog output 2 +
2
EX AG
analog output 2 –
3
NC
not connected
5
EX AO1
analog output 1 +
6
EX AG
analog output 1 –
Note: The AO module must be placed on the 3rd interface from left to right.
AO module
4.3.6. WPM770–AI: 2 analog inputs
No.
1
Terminal
EX AI1
Description
analog input 1 +
2
EX AG
analog input 1 –
3
NC
not connected
5
EX AI2
analog input 2 +
6
EX AG
analog input 2 –
- 14 -
Weigel Meßgeräte GmbH
P.O.B. 720 154 D–90241 Nürnberg Phone: 0911 / 4 23 47–0
Erlenstraße 14 D–90441 Nürnberg
Fax: 0911 / 4 23 47–39
Management:
Phone: 0911 / 4 23 47–94
Internet:
http://www.weigel-messgeraete.de
e-mail:
vertrieb@weigel-messgeraete.de
Operating Manual
679.B.141.04
Digital Multifunctional
Power Meter with LCD
Display and Optional
Modules
4.4.
WPM770–M: Memory module
4.4.1. Functional description
The memory module works with the WPM770 basic unit to save the measured data
regularly (interval: 5 min). The save cycle is one year.
It saves the parameters as below:
• 3-phase voltage
• 3-phase current
• Frequency
• Voltage unbalance rate
• 3-phase power factor
• THD for voltage
• Demand current
• Demand active power
• Demand reactive power
• Demand apparent power
The stored data can be read out from the WPM770 via RS485 communication.
4.4.2. Specifications
Parameter
Specification
Storage capacity
64 Mbit
Speed
500 ... 1000 ms
Temperature
-20 ... 55°C
Service life
10 years
Data save cycle
1 year
Data save interval
5 min
- 15 -
5.
Display and Keys
5.1.
LCD Display
Displays for:
1: Function
2: Measuring units 1)
3: Load rate = average current/rated current *
100%
4: Status of the digital inputs (DI) and the
digital outputs (DO):
= ON,
= OFF
5: Communikation:
= no connection,
= connection with internal RS485
interface 1,
= connection with interface 2
6: Unit
7: Measured values 2)
8: Key function
9: Alarm:
5
9
1
6
2
3
7
4
8
means, there is an error
1
) The phases are indicated by A, B, C:
A = L1, B = L2, C = L3
2
) none (+) = import,
= capacitive,
- = export
= inductive
Note: The display backgroand illumination is lit after pressing a key. When no key is
pressed, the illumination goes out after approximately 35 s
- 16 -
Weigel Meßgeräte GmbH
P.O.B. 720 154 D–90241 Nürnberg Phone: 0911 / 4 23 47–0
Erlenstraße 14 D–90441 Nürnberg
Fax: 0911 / 4 23 47–39
Management:
Phone: 0911 / 4 23 47–94
Internet:
http://www.weigel-messgeraete.de
e-mail:
vertrieb@weigel-messgeraete.de
Operating Manual
679.B.141.04
Digital Multifunctional
Power Meter with LCD
Display and Optional
Modules
5.2. Keys and key functions
WPM 770 is equipped by four keys F1 to F4. By pressing these keys, you can display
measured values and you can program settings.
The key function is indicated in the display.
Key function
Menu item
Description
Call up the respective menu
-- -- -- -- {
Display further functions
Return to previous menu or cancel
SET
Call up the settings
Displays see 8. Displaying Measured Values
Programming see 9. Programming
- 17 -
6.
Measurements
6.1. Voltages
The overload limit for voltages is 120% of the rated voltage. Exceeding this limit may result
in inaccurate measurement readouts.
6.2. Currents
WPM 770 can only be connected via current transducers.
The CT secondary rating must coincide with the rated current of the meter.
The CT primaty rating can be programmed to 1 ... 9999 A. The CT primary rating should not
be smaller than the rated current of the meter.
The overload limit for currents is 120% of the rated current. Exceeding this limit may result
in inaccurate measurement readouts.
6.3. Powers
The measuring range for active, reactive, and apparent power is 0 ... 649,9 MW/Mvar/MVA
per phase or 0 ... 1949,9 MW/Mvar/MVA in total.
6.4. Power factor
The power factor is calculated and displayed in 4 quadrants. The display will only be correct
if the phase sequence of the connection is correct.
6.5. Frequency
Depending on the connection, the frequency is measured on different phases.
With 3-wire connection, the frequency is measured on the L1-L2 voltage.
With 4-wire connection, the frequency is measured on the L1 voltage.
In the case of L1 outage, the frequency is measured on the L3 voltage.
In the case of L1 and L3 outage, the frequency is measured on the L2 voltage.
6.6. Energies
WPM 770 measures the energies bidirectionally in 4 quadrants.
The polarities of the active and reactive energies (import/export, inductive/capacitive)
comply to the powers according to the IEC standards.
The energy values are counted up to 99.999.999,9 kWh/kVarh. After that, the count restarts
from zero.
- 18 -
Weigel Meßgeräte GmbH
P.O.B. 720 154 D–90241 Nürnberg Phone: 0911 / 4 23 47–0
Erlenstraße 14 D–90441 Nürnberg
Fax: 0911 / 4 23 47–39
Management:
Phone: 0911 / 4 23 47–94
Internet:
http://www.weigel-messgeraete.de
e-mail:
vertrieb@weigel-messgeraete.de
Operating Manual
679.B.141.04
Digital Multifunctional
Power Meter with LCD
Display and Optional
Modules
6.7. Demand
WPM 770 calculates the demand for the currents of the 3 phases and for the total active,
reactive, and apparent powers.
WPM 770 supports two calculation methods: fixed block and moving block
The demand time is programmable to 5 min, 10 min, 15 min, 30 min, or 60 min.
• With the "fixed" calculation method, no subinterval is required.
• With the "moving" calculation method, a subinterval of 1 min, 2 min, or 3 min can be
programmed:
Demand time
Possible subintervals
5 min
1 min
10 min
1 min or 2 min
15 min
1 min or 3 min
30 min
1 min, 2 min, or 3 min
60 min
1 min, 2 min, or 3 min
With the "moving" calculation method, the demand values are calculated as follows:
Sum of an electrical parameter in the demand time divided by the demand time.
The calculation is updated after expiration of the subinterval each.
The following figure illustrates the calculation method:
On the end of the subinterval,
the calculation is updated.
The demand value is the mean
value in in the demand time.
Calculation interval
Demand time e.g. 10 min
Time
(minutes)
WPM 770 stores the maximum demand of the powers and currents with time stamps in the
non-volatile memory.
- 19 -
The demand values are shown on the display and can be read out via RS 485.
6.8. Phase sequence
WPM 770 identifies the phase sequence and shows it directly on voltage display (VOL).
Examples:
Correct phase sequence
On L3, the incorrect phase
L2 is present
Phases L1 and L2 are
exchanged
Note: The phase sequence will only be identified correctly, if the voltages as well as the
currents are powered 3-phase.
- 20 -
Weigel Meßgeräte GmbH
P.O.B. 720 154 D–90241 Nürnberg Phone: 0911 / 4 23 47–0
Erlenstraße 14 D–90441 Nürnberg
Fax: 0911 / 4 23 47–39
Management:
Phone: 0911 / 4 23 47–94
Internet:
http://www.weigel-messgeraete.de
e-mail:
vertrieb@weigel-messgeraete.de
Operating Manual
679.B.141.04
Digital Multifunctional
Power Meter with LCD
Display and Optional
Modules
7.
Quality Analysis
7.1. Overview
The following values are calculated in class B accuracy for assessment of the voltage,
current, power, and energy quality:
Unit
Total Harmonic
Distorsion (THD)
TOHD = even
harmonics
TEHD = odd
harmonics
Parameter
THD of the phase voltages
Range
0 ... 100%
TOHD of the phase voltages
0 ... 100%
TEHD of the phase voltages
0 ... 100%
THD of the phase currents
0 ... 100%
TOHD of the phase currents
0 ... 100%
TEHD of the phase currents
0 ... 100%
Harmonics
Harmonic Ratio (HR) HR of the phase voltages
0 ... 100%
HR of the phase currents
0 ... 100%
2. - 31.
effective value
0. - 31.
Root Mean Square RMS of the phase voltages
(RMS)
RMS of the phase currents
Others
2. - 31.
effective value
0. - 31.
RMS of the total active power
effective value
0. - 31.
RMS of the total active energy
effective value
1. - 31.
Crest faktor of the phase voltages
-
K faktor of the phase voltages
-
Frequency deviation
Hz
Voltage deviation
0 ... 100%
Voltage unbalance
0 ... 100%
The can be read on the display or read out via RS 485.
- 21 -
7.2. Harmonics
WPM 770 provides harmonic analysis up to the 31st harmonic as well as calculation of the
total harmonic distortion (THD), of the K factor and the crest factor.
The THD refers to the total of higher harmonics except fandamental harmonic, and it is
calculated according to the following formula:
THD = Σ iN= 2
i
X
2
i
: Harmonic order
X i : Percentage of the effective value of each harmonic to that of the fundamental
harmonic
N: Highest harmonic, here 31
The crest factor is calculated as follows:
N
CF = 1.414Σ h=
1
Uh
U1
U1: Amplitude of the fundamental harmonic
Uh: Amplitude of the hth harmonic
N: Highest harmonic, here 31
If no voltage is applied, the crest factor will be zero.
The K factor is calculated as follows:
K − Factor =
Σ hN=1 (I h × h)
2
Σ hN=1 (I h )
2
Ih: Ratio of the hth harmonic
h: Harmonic order
N: Highest harmonic, here 31
If no current is applied, the K factor will be zero.
- 22 -
Weigel Meßgeräte GmbH
P.O.B. 720 154 D–90241 Nürnberg Phone: 0911 / 4 23 47–0
Erlenstraße 14 D–90441 Nürnberg
Fax: 0911 / 4 23 47–39
Management:
Phone: 0911 / 4 23 47–94
Internet:
http://www.weigel-messgeraete.de
e-mail:
vertrieb@weigel-messgeraete.de
Operating Manual
679.B.141.04
Digital Multifunctional
Power Meter with LCD
Display and Optional
Modules
7.3. Frequency deviation
The frequency deviation is the difference between the actual frequency and the rated
frequency.
Fequency deviation = current frequency - rated frequency
The rated ferquency can be set via RS 485 to 50 Hz or 60 Hz.
WPM 770 records 30 events of frequency deviations, which exceed a programmable
setpoint. In the case of a setpoint exceedance, the event is recorded with a time stamp, the
durance, and the maximum deviation.
7.4. Voltage deviation
The voltage deviation is the ratio of the difference of the actual voltage and the rated voltage
in relation to the rated voltage.
Voltage deviation (%) = (current voltage - rated voltage) / rated voltage x 100%
The voltage deviation can be positive or negative.
WPM 770 records 30 events of voltage deviations, which exceed a programmable setpoint.
In the case of a setpoint exceedance the event is recorded with a time stamp, the durance
and the maximum deviation.
7.5. Voltage unbalance
The voltage unbalance is calculated as follows:
ε U = U 2 U × 100%
1
U1: Effektive value of the 3-phase voltage in positive direction
U2: Effektive value of the 3-phase voltage in negative direction
WPM 770 records 30 events of voltage unbalance, which exceed a programmable setpoint.
In the case of a setpoint exceedance the event is recorded with a time stamp, the durance
and the maximum deviation.
Note: Current unbalance is not calculated.
- 23 -
8.
Displaying Measured Values
8.1.
Display after power-on
Mean voltage Ph-N (4 wire) or Ph-Ph (3 wire)
Mean current
Total power
Total energy
Menu prompt/Key function: (Select with -- -- -- -- { )
VOL: Voltages
I: Currents
FRE: Frequency
POWER: Powers
ENERGY: Energies
EQ: Harmonics
DMD: Demand
further menus with optional modules
SET: Settings
- 24 -
Weigel Meßgeräte GmbH
P.O.B. 720 154 D–90241 Nürnberg Phone: 0911 / 4 23 47–0
Erlenstraße 14 D–90441 Nürnberg
Fax: 0911 / 4 23 47–39
Management:
Phone: 0911 / 4 23 47–94
Internet:
http://www.weigel-messgeraete.de
e-mail:
vertrieb@weigel-messgeraete.de
Operating Manual
679.B.141.04
Digital Multifunctional
Power Meter with LCD
Display and Optional
Modules
8.2.
Menu overview for measuring values diplay
Menu
Description
VOL
Voltages
L-N
Voltages phase-neutral and mean value
L-L
Voltages phase-phase and mean value
UNBAL
Phase unbalance positive (U-2), negative (U-1), neutral
(U-0), ratio
MAX
Maximum voltages Ph-N or Ph-Ph and time stamps
MIN
Minimum voltages Ph-N or Ph-Ph and time stamps
REC
Recording of voltage deviations
I
Currents
I-0
Neutral current
MAX
Maximum currents and time stamps
MIN
Minimum currents and time stamps
FRE
Frequency
REC
POWER
Recording of frequency deviations
Leistungen
P
Active powers per phase and in total
Q
Reactive powers per phase and in total
S
Apparent powers per phase and in total
PF
Power factor per phase and in total
ENERGY
Energies
KWH
Import (IN) and Export (OUT) active energies per phase
KVARH
Import (IN) and Export (OUT) reactive energies per
phase
TOU
Import (IN) and Export (OUT) active and reactive
energies in the tariffs 1 - 4
- 25 -
EQ
Harmonics
THD
Total Harmonic Distorsion for voltage (U) and current (I)
for L1, L2, L3
HR
2nd to 31st harmonic in % for voltage (U) and current (I)
for L1, L2, L3 (Harmonic Ratio)
RMS
Effective value of the 0th to 31st harmonic for voltage (U),
current (I), and total power (P) for L1, L2, L3
CF
Crest faktor of the voltages for L1, L2, L3
K-FAC
K faktor of the voltages for L1, L2, L3
ENRGY
1st to 13th harmonic of the active energy
DMD
Demand
IA
Maximum demand for current L1 and time stamp
IB
Maximum demand for current L2 and time stamp
IC
Maximum demand for current L3 and time stamp
P
Maximum demand for active power and time stamp
Q
Maximum demand for reactive power and time stamp
S
Maximum demand for apparent power and time stamp
- 26 -
Weigel Meßgeräte GmbH
P.O.B. 720 154 D–90241 Nürnberg Phone: 0911 / 4 23 47–0
Erlenstraße 14 D–90441 Nürnberg
Fax: 0911 / 4 23 47–39
Management:
Phone: 0911 / 4 23 47–94
Internet:
http://www.weigel-messgeraete.de
e-mail:
vertrieb@weigel-messgeraete.de
Operating Manual
679.B.141.04
Digital Multifunctional
Power Meter with LCD
Display and Optional
Modules
8.3.
Display of the voltages (VOL)
♦ Press key F1 once.
Voltage L1
Voltage L2
Voltage L3
Mean value voltages phase-neutral
Menu prompt/Key function: (Select with -- -- -- -- { )
L-N: Voltages phase-neutral and mean value
L-L: Voltages phase-phase and mean value
UNBAL: Phase unbalance positive (U-2), negative (U-1), neutral (U-0), ratio
MAX: Maximum voltages Ph-N or Ph-Ph and time stamps
MIN: Minimum voltages Ph-N or Ph-Ph and time stamps
REC: Recording of the voltage setpoint exceedings
- 27 -
Display of the maximum/minimum voltages (MAX/MIN)
Maximum value
Year YYYY
Date MM-DD
Time hh-mm-ss
Display of the voltage deviations (REC)
Event number
Voltage deviation
Year YYYY
Date MM-DD
Time hh-mm-ss
Menu prompt/Key function:
UP: Previous event
DOWN: Next event
START: Start of event
END: End of event
- 28 -
Weigel Meßgeräte GmbH
P.O.B. 720 154 D–90241 Nürnberg Phone: 0911 / 4 23 47–0
Erlenstraße 14 D–90441 Nürnberg
Fax: 0911 / 4 23 47–39
Management:
Phone: 0911 / 4 23 47–94
Internet:
http://www.weigel-messgeraete.de
e-mail:
vertrieb@weigel-messgeraete.de
Operating Manual
679.B.141.04
Digital Multifunctional
Power Meter with LCD
Display and Optional
Modules
8.4.
Display of the currents (I)
Current L1
Current L2
Current L3
Mean current
I-0
Menu prompt/Key function:
I-0: Neutral current
MAX: Maximum currents and time stamps
MIN: Minimum currents and time stamps
- 29 -
8.5.
Display of the frequency (FRE)
Menu prompt/Key function:
REC: Recording of the frequency deviations
Display of the frequency deviations (REC)
Event number
Frequency deviation
Year YYYY
Date MM-DD
Time hh-mm-ss
Menu prompt/Key function:
UP: Previous event
DOWN: Next event
START: Start of event
END: End of event
- 30 -
Weigel Meßgeräte GmbH
P.O.B. 720 154 D–90241 Nürnberg Phone: 0911 / 4 23 47–0
Erlenstraße 14 D–90441 Nürnberg
Fax: 0911 / 4 23 47–39
Management:
Phone: 0911 / 4 23 47–94
Internet:
http://www.weigel-messgeraete.de
e-mail:
vertrieb@weigel-messgeraete.de
Operating Manual
679.B.141.04
Digital Multifunctional
Power Meter with LCD
Display and Optional
Modules
8.6.
Display of the powers (POWER)
Menu prompt/Key function: (Select with -- -- -- -- { )
P: Active powers per phase and in total
Q: Reactive powers per phase and in total
S: Apparent powers per phase and in total
PF: Power factor per phase and in total
Display of the active powers:
L1
L2
L3
Gesamt
Display of the reactive powers:
L1
L2
L3
Gesamt
- 31 -
8.7.
Display of the energies (ENERGY)
Menu prompt/Key function:
KWH: Imported (IN) and exported (OUT) active energies per phase
KVARH: Imported (IN) and exported (OUT) reactive energies per phase
TOU: Imported (IN) and exported (OUT) active and reactive energies in the tariffs 1 - 4
Display example of the imported active energy in phase L1 (KWH A-IN)
Display example of the imported active energy in tariff 1 (TOU I IN KWH)
- 32 -
Weigel Meßgeräte GmbH
P.O.B. 720 154 D–90241 Nürnberg Phone: 0911 / 4 23 47–0
Erlenstraße 14 D–90441 Nürnberg
Fax: 0911 / 4 23 47–39
Management:
Phone: 0911 / 4 23 47–94
Internet:
http://www.weigel-messgeraete.de
e-mail:
vertrieb@weigel-messgeraete.de
Operating Manual
679.B.141.04
Digital Multifunctional
Power Meter with LCD
Display and Optional
Modules
4-Quadrant measurement and display
Display
Unit
kWh
Display of energy value
Imported inductive active energy
kWh
Exported capacitive active energy
kWh
Exported inductive active energy
kWh
Imported capacitive active energy
kVarh
Imported inductive reactive energy
kVarh
Exported capacitive reactive energy
kVarh
Exported inductive reactive energy
kVarh
Imported capacitive reactive energy
kWh
Imported inductive and capacitive active energy
kWh
Exported inductive and capacitive active energy
kVarh
Reactive 1st and 2nd quadrant energy
kVarh
Reactive 3rd and 4th quadrant energy
- 33 -
8.8.
Display of the harmonics (EQ)
Menu prompt/Key function: (Select with -- -- -- -- { )
THD: Total Harmonic Distorsion
• THD: THD for voltage (U) and current (I) for L1, L2, L3
• TEHD: THD of the even harmonics for voltage (U) and current (I) for L1, L2, L3
• TOHD: THD of the odd harmonics for voltage (U) and current (I) for L1, L2, L3
HR (Harmonic Ratio): 2nd to 31st harmonic in % for voltage (U) and current (I) for L1, L2, L3
RMS: Effective value of the 0th to 31st harmonic for voltage (U), current (I) for L1, L2, L3
and total active power (P)
CF: Crest faktor of the voltages for L1, L2, L3
K-FAC: K faktor of the voltages for L1, L2, L3
ENRGY: 1st to 13th harmonic of the active energy
Display example of the THD of the voltages
- 34 -
Weigel Meßgeräte GmbH
P.O.B. 720 154 D–90241 Nürnberg Phone: 0911 / 4 23 47–0
Erlenstraße 14 D–90441 Nürnberg
Fax: 0911 / 4 23 47–39
Management:
Phone: 0911 / 4 23 47–94
Internet:
http://www.weigel-messgeraete.de
e-mail:
vertrieb@weigel-messgeraete.de
Operating Manual
679.B.141.04
Digital Multifunctional
Power Meter with LCD
Display and Optional
Modules
Display example of the 2nd harmonic of the voltages in %
Display example of the effective value of the 0th harmonic of the voltages
Display example of the crest faktor of the voltages
- 35 -
Display example of the K faktor of the voltages
Display example of the 1st harmonic of the active energy
- 36 -
Weigel Meßgeräte GmbH
P.O.B. 720 154 D–90241 Nürnberg Phone: 0911 / 4 23 47–0
Erlenstraße 14 D–90441 Nürnberg
Fax: 0911 / 4 23 47–39
Management:
Phone: 0911 / 4 23 47–94
Internet:
http://www.weigel-messgeraete.de
e-mail:
vertrieb@weigel-messgeraete.de
Operating Manual
679.B.141.04
Digital Multifunctional
Power Meter with LCD
Display and Optional
Modules
8.9.
Display of the demand values (DMD)
Menu prompt/Key function: (Select with -- -- -- -- { )
IA: Maximum demand for current L1 and time stamp
IB: Maximum demand for current L2 and time stamp
IC: Maximum demand for current L3 and time stamp
P: Maximum demand for active power and time stamp
Q: Maximum demand for reactive power and time stamp
S: Maximum demand for apparent power and time stamp
Display example of the maximum demand for current L1
Maximum demand
Year YYYY
Date MM-DD
Time hh-mm-ss
- 37 -
8.10. Display of analog inputs (ANALOG IN) - only with WPM770-AI
analog input 1
analog input 2
9.
Programming
9.1. Start programming
♦ When SET is displayed, press the F4 key.
Measurements display
Programming
SET: Press F4 key
Menu/Key function: (Select with -- -- -- -- { )
METER: Meter settings
COM: RS485 settings
CLEAR: Clear data
RELAY: Relay settings
further menus with optional modules
LIMIT: Setpoint settings
ERROR: Error log
- 38 -
Weigel Meßgeräte GmbH
P.O.B. 720 154 D–90241 Nürnberg Phone: 0911 / 4 23 47–0
Erlenstraße 14 D–90441 Nürnberg
Fax: 0911 / 4 23 47–39
Management:
Phone: 0911 / 4 23 47–94
Internet:
http://www.weigel-messgeraete.de
e-mail:
vertrieb@weigel-messgeraete.de
Operating Manual
679.B.141.04
Digital Multifunctional
Power Meter with LCD
Display and Optional
Modules
9.2.
Entering the key number (PIN)
For changing programmed settings, you must enter the
key number (PIN).
CODE is displayed.
♦ Press the F3 key.
♦ Enter the correct PIN:
Standard PIN: 0001
Super PIN: 2011
UP: Increase value
LEFT: Select figure to the left (active figure flashes)
: Cancel, back to previous menu
EDIT is displayed when the key number has been
entered correctly.
♦ Press the F3 key to change the setting.
♦ Change the value.
♦ Press the F3 key again to accept the setting.
Example:
flashes
- 39 -
9.3.
Programming menu overview
9.4.
Meter settings (METER)
Menu
INFO
Ex-M
Description
Device information:
V-S: Software version
V-H: Hardware version
S N: Series number
Attached optional modules (1 to 3):
nuLL: none
PULSE: WPM 770–EP Optional module 2 pulse outputs
- 40 -
Weigel Meßgeräte GmbH
P.O.B. 720 154 D–90241 Nürnberg Phone: 0911 / 4 23 47–0
Erlenstraße 14 D–90441 Nürnberg
Fax: 0911 / 4 23 47–39
Management:
Phone: 0911 / 4 23 47–94
Internet:
http://www.weigel-messgeraete.de
e-mail:
vertrieb@weigel-messgeraete.de
Operating Manual
679.B.141.04
Digital Multifunctional
Power Meter with LCD
Display and Optional
Modules
DI: WPM 770–S Optional module 4 additional status inputs
DO: WPM 770–R Optional module 2 additional relay outputs
M 8MB: WPM 770–M Optional module memory extension 8 MB
AO: WPM 770–AO Optional module 2 analogue outputs 4 ... 20 mA
AI: WPM 770–AI Optional module 2 analogue inputs 4 ... 20 mA
PROFI: WPM 770–P Optional module Profibus interface 1)
BACNE: WPM 770–BA Optional module BACnet interface 1)
PT
P-R: Voltage transducer primary value 0,1 ... 65 kV 1) 2)
S-E: Voltage transducer secondary value (fixed, see meter label) 2)
CT
P-R: Current transducer primary value 1 ... 9999 A
S-E: Current transducer secondary value (fixed, see meter label) 2)
MODE
Mains type: 2)
4Y: 4-wire star
3d: 3-wire delta
DATE
Date:
Y: Year 2000 ... 2099
M: Month 1 ... 12
D: Day 1 ... 31
TIME
Time:
H: Hour 0 ... 23
M: Minute 0 ... 59
S: Second 0 ... 59
DMD
Demand settings:
TYPE: Calculation method STAC = fixed, SLIP = moving
PERIO: Demand time 5, 10, 15, 30 or 60 min
SLIP: Time for subinterval 1, 2 or 3 min (only required for moving
calculation method)
Pulse outputs (only with WPM 770–EP):
PUL-1: Pulse output 1
OBJ: Object/measuring unit: Active energy (only displayed, cannot be
changed)
CONST: Pulse constant 1000 ... 9999
WIDTH: Pulse width 60 ... 100 ms
PULSE
- 41 -
PUL-2: Pulse output 2
OBJ: Object/measuring unit: Active energy (only displayed, cannot be
changed)
CONST: Pulse constant 1000 ... 9999
WIDTH: Pulse width 60 ... 100 ms
DEFAU
Reset to factory settings: no: / YES
CODE
Change key number (PIN): 1 ... 9999
CALIB
Meter calibration: no: / YES
♦ Before starting calibration, connect the meter to 3-phase mains.
♦ Select YES.
♦ Select START.
♦ Step 1: RMS RATIO BIG - Feed the meter with rated voltage, rated
current with power factor 1.0
♦ Select NEXT.
♦ Step 2: RMS DEG BIG - Feed the meter with rated voltage, rated
current with power factor 0.5 inductive.
♦ Select NEXT.
♦ Step 3: RMS RTO SMALL - Feed the meter with rated voltage,
0,25 A with power factor 1.0
♦ Select NEXT.
♦ Step 4: RMS DEG SMALL - Feed the meter with rated voltage,
0,25 A with power factor 0.5 inductive.
Device test: Segment test of the dsplay, memory test, test of the keys
(when prompted F1 PUT, press the F1 key, etc.)
CHECK
DEMO
Demonstration mode:
The meter shows fixed values for demonstration purposes.
1
) on request
) A different value can be set but will not be stored if not supported by the meter.
2
- 42 -
Weigel Meßgeräte GmbH
P.O.B. 720 154 D–90241 Nürnberg Phone: 0911 / 4 23 47–0
Erlenstraße 14 D–90441 Nürnberg
Fax: 0911 / 4 23 47–39
Management:
Phone: 0911 / 4 23 47–94
Internet:
http://www.weigel-messgeraete.de
e-mail:
vertrieb@weigel-messgeraete.de
Operating Manual
679.B.141.04
Digital Multifunctional
Power Meter with LCD
Display and Optional
Modules
9.5.
RS485 settings (COM)
Menu
M1ADD
M1BAU
9.6.
Description
RS485 device address of the internal RS485 interface: 1 ... 247
RS485 baud rate of the internal RS485 interface: 2400, 4800, 9600,
19200, 38400
Clear data (CLEAR)
Menu
ENERG
Description
Reset energy counters
DMD
Reset demand values
MX/MN
Reset mininimum and maximum values
REC
Reset all setpoint exeedings/deceedings for frequecy, voltage and voltage
unbalance
Reset all events
SOE
Note: When YES is selected, the values will be reset. After that, no will be displayed
again.
9.7.
Relay settings (RELAY)
Menu
R1
Description
Settings relay output 1
R2
Settings relay output 2
R3
Settings relay output 3 (only with WPM 770–R)
R4
Settings relay output 4 (only with WPM 770–R)
jeweils:
MODE
Switching mode
Lo: Local: Relay reacts on the programmed internal setpoint.
rE: Remote: Relay reacts on an external switching signal.
HIGH
Upper setpoint 0 ... 120% (only for setting Lo local)
LOW
Lower setpoint 0 ... 120% (only for setting Lo local)
- 43 -
OBJ
Measuring unit for realy output (only for setting Lo local):
nuLL: none
F: Frequency
U1: Voltage L1
U2: Voltage L2
U3: Voltage L3
U0: Voltage N
UnA: Mean voltage phase-N
U12: Voltage L1-L2
U23: Voltage L2-L3
U31: Voltage L3-L1
ULA: Mean voltage phase-phase
A1: Current L1
A2: Current L2
A3: Current L3
A0: Current N
IAu9: Mean current
PF1: Power factor L1
PF2: Power factor L2
PF3: Power factor L3
PFtot: Power factor total
UnbU: Phase unbalance voltages
THdU1: THD Voltage L1
THdU2: THD Voltage L2
THdU3: THD Voltage L3
THdA1: THD Current L1
THdA2: THD Current L2
THdA3: THD Current L3
DELAY
Delay time 0 ... 99 s (only for setting Lo local)
0 means, that relay will react immediately when the setpoint is reached.
BACK
Delay time 0 ... 99 s (only for setting rE remote)
0 means, that the relay will not fall back.
- 44 -
Weigel Meßgeräte GmbH
P.O.B. 720 154 D–90241 Nürnberg Phone: 0911 / 4 23 47–0
Erlenstraße 14 D–90441 Nürnberg
Fax: 0911 / 4 23 47–39
Management:
Phone: 0911 / 4 23 47–94
Internet:
http://www.weigel-messgeraete.de
e-mail:
vertrieb@weigel-messgeraete.de
Operating Manual
679.B.141.04
Digital Multifunctional
Power Meter with LCD
Display and Optional
Modules
Note: If the programmed setpoint is outside of the measuring range, the setpoint will be
ignored by the meter.
Example: The measuring range for frequency is 45 ... 65 Hz.
• For rated frequency 50 Hz: the setpoint range is 90 ... 120%
• For rated frequency 60 Hz: the setpoint range is 75 ... 108,3%
When programming a lower setpoint of 20% (i.e. 10 Hz or 12 Hz), no alarm will be output
because the setpoint is not valid.
Note: Only when the setpoint is exceeded or deceeded and the delay time has elapsed, the
relay will be activated. Delay time = 0 means immediate activation.
9.8.
Settings for analog outputs (AO) - only with WPM770-AO
Menu
Description
AO1
Settings analog output 1
AO2
Settings analog output 2
OBJ
Measuring unit for analog output:
nuLL: none
U1: Voltage L1
U2: Voltage L2
U3: Voltage L3
U12: Voltage L1-L2
U23: Voltage L2-L3
U31: Voltage L3-L1
A1: Current L1
A2: Current L2
A3: Current L3
P: Total active power
q: Total reactive power
PF: Total power factor
F: Frequency
RATES
Scaling factor for analog range: λ = 1,0 ... 10,0
- 45 -
Conversion characteristics with scaling factor λ
I
U
P
¦Ë*Ie
¦Ë*Ue
¦Ë*Pe
Output
0 4mA
Output
0 4mA
20mA
PF
Q
-¦Ë*Qe 4mA
Output
20mA
-1.000 4mA
20mA
F
1.000
¦Ë*Qe
Output
-¦Ë*Pe 4mA
20mA
65Hz
Output
Output
35Hz 4mA
20mA
20mA
with:
with:
:
Phase)
is the real measurement of analog value,
unit: mA.
Rated
voltage
(Phase-
: Rated Current
: Rated power in W or var.
: Scaling factor in the range 1 ... 10
Factory setting: λ =1
Note:
When the measuring unit for the analog output is set to frequency (F) or total power (P, q),
then always λ =1.
- 46 -
Weigel Meßgeräte GmbH
P.O.B. 720 154 D–90241 Nürnberg Phone: 0911 / 4 23 47–0
Erlenstraße 14 D–90441 Nürnberg
Fax: 0911 / 4 23 47–39
Management:
Phone: 0911 / 4 23 47–94
Internet:
http://www.weigel-messgeraete.de
e-mail:
vertrieb@weigel-messgeraete.de
Operating Manual
679.B.141.04
Digital Multifunctional
Power Meter with LCD
Display and Optional
Modules
9.9.
Setpoint settings (LIMIT)
Menu
F
Description
Setpoint for frequency deviation 0 ... 10,00 Hz
VOL
Setpoint for voltage deviation 0 ... 100,00%
UNBAL
Setpoint for voltage unbalance 0 ... 100,00%
9.10. Error log (ERROR)
Menu
Description
1
Read error non-volatile memory
2
Write error non-volatile memory
3
Read error volatile memory
4
Write error volatile memory
5
Sampling error
6
Communication error
7
Calculation error
10 errors are recorded for each error category.
is shown in the display.
In case of an error,
In this case, contact your distributor.
- 47 -
10. Energy Counting and Tariffs
10.1. Energy counting
WPM 770 calculates the energy flow in in 4 quadrants in multiple tariffs and records it.
The energies are counted as of the first powering on of the meter.
The energies can be reset to zero by using the keys or via the RS 485 interface.
After 99.999.999,9 kWh/kvarh, the counters restart from zero.
The total energy, the multiple tariff energies, and the energies of the last month and the last
year are counted.
With 4-wire connection, the energies per phase are counted additionally in 4 quadrants.
10.2. Tariff tables
WPM 770 supports two tariff tables, which can be programmed separately.
Each tariff table can be programmed in 8 periods per day with 4 different tariffs.
Example for tariff tables:
Tariff table
Tbale 1
Table 2
No. periods
8
5
Sequence Starting time (period)
1.
00:00 (- 03:00)
Tariff
F1
2.
03:00 (- 06:00)
F2
3.
4.
06:00 (- 09:00)
09:00 (- 12.00)
F4
F3
5.
12:00 (- 15:00)
F1
6.
7.
15:00 (- 18:00)
18:00 (- 21:00)
F4
F2
8.
21:00 (- 24:00)
F3
1.
2.
06:00 (- 10:00)
10:00 (-12:00)
F1
F2
3.
12:00 (-14:00)
F1
4.
5.
14:00 (- 20:00)
20:00 (- 06:00)
F3
F4
- 48 -
Weigel Meßgeräte GmbH
P.O.B. 720 154 D–90241 Nürnberg Phone: 0911 / 4 23 47–0
Erlenstraße 14 D–90441 Nürnberg
Fax: 0911 / 4 23 47–39
Management:
Phone: 0911 / 4 23 47–94
Internet:
http://www.weigel-messgeraete.de
e-mail:
vertrieb@weigel-messgeraete.de
Operating Manual
679.B.141.04
Digital Multifunctional
Power Meter with LCD
Display and Optional
Modules
There are two modes for the tariffs: "by date" or by "holiday days"
• In the "by date" mode, the year (365 days) is divided in two periods.
• In the "by holiday days" mode, the days are classified as working days and holiday days.
Working days are monday to friday, holyday days are saturday and sunday.
Example for programming the modes:
Mode
by date
Time zone 1 (tariff table 1)
April 1st - September 30th
Time zone 2 (tariff table 2)
October 1st - March 31st
by holiday days
Monday to Friday
Saturday and Sunday
Important notes
•
•
•
•
A day (24 hours) can be divided into a maximum of 8 periods with 4 tariffs.
Each period must be >15 min, the duration must be a multiple of 15 min.
The starting times must be programmed in ascending order.
The tariffs can only be programmed via the RS485 interface and not by using the keys.
• If two periods of the same tariff interfere to each other, the meter merges the two
periods.
• Time zone 1 uses tariff table 1, time zone 2 uses tariff table 2
It cannot be changed.
- 49 -
11. Event Recording
WPM 770 records 100 error events and 30 setpoint events for frequency, voltage and
voltage unbalance each.
Additionally, the WPM 770 provides the maximum values of the demand as well as the
maximum and minimum values of the consumation.
11.1. Relay events
WPM 770 is able to record the switching events and the relay status (ON/OFF).
The switching events are stored with time stamp in the UNIX time format.
(UNIX time format = Time in seconds as of the 1/1/1970, 00:00 hours)
The time resolution is 1 ms.
The events can be read out by software.
Example: 2013-07-23 09:31:34 792 ms Relay 1 ON
11.2. Frequency deviations
The setpoint for frequency deviation can be programmed
(default: 0,2 Hz, range: 0 ... 10 Hz).
When exceeding or deceeding the setpoint, the frequency deviation, start and end of the
frequency devaiation, and the maximum frequency deviation (with sign) are stored.
The values can be shown on the display and read out via the RS 485 interface.
Example: 2013-07-23 09:28:34 - 2013-07-23 09:30:15, frequency deviation, max. 0.5 Hz
11.3. Voltage deviations
The setpoint for voltage deviation can be programmed (default: 10%, range: 0 ... 99,99%).
When exceeding or deceeding the setpoint, the voltage deviation, start and end of the
voltage devaiation, and the maximum voltage deviation (with sign) are stored.
The values can be shown on the display and read out via the RS 485 interface.
Example: 2013-07-23 15:02:25 - 2013-07-23 15:30:46, voltage deviation, max. -14%
- 50 -
Weigel Meßgeräte GmbH
P.O.B. 720 154 D–90241 Nürnberg Phone: 0911 / 4 23 47–0
Erlenstraße 14 D–90441 Nürnberg
Fax: 0911 / 4 23 47–39
Management:
Phone: 0911 / 4 23 47–94
Internet:
http://www.weigel-messgeraete.de
e-mail:
vertrieb@weigel-messgeraete.de
Operating Manual
679.B.141.04
Digital Multifunctional
Power Meter with LCD
Display and Optional
Modules
11.4. Voltage unbalance
The setpoint for voltage unbalance can be programmed (default: 20%, range: 0 ... 100%).
When exceeding or deceeding the setpoint, the voltage unbalance, start and end of the
voltage unbalance, and the maximum voltage unbalance are stored.
The values can be shown on the display and read out via the RS 485 interface.
Example: 2013-07-23 17:05:25 - 2013-07-23 17:28:35, voltage unbalance, max. 24%
11.5. Maximum demand
WPM 770 records the maximum demand for the currents of the 3 phases and the total
active, reactive, and apparent power.
When the actual demand exceeds the stored demand, the new maximum demand will be
stored with time stamp.
The values can be shown on the display and read out via the RS 485 interface.
11.6. Maximum and minimum values
WPM 770 records the maximum and minimum 3-phase values for the voltages (Ph-N or PhPh), currents, active, reactive, and apparent powers.
When the actual value exceeds or deceeds the stored value, the new maximum value will
be stored with time stamp.
The values can be shown on the display and read out via the RS 485 interface.
- 51 -
12. Troubleshooting
Possible problem
Possible cause
No display after
power-up.
Auxiliary supply may
not be connected.
Voltage measurement
is not correct.
Measured values are
false
or
not
as
expected.
There is no change in
the ON-OFF status of
the status inputs
Relay does not react
No or not correct
pulses on pulse output
(only with WPM 770EP)
No
communication
with the meter
Current measurement
is not correct.
Possible solution
Check rated voltage on L/+ and N/terminals.
Check fuse in auxiliary supply.
Check neutral connection.
Check voltage to match rated voltage.
Check voltage transformer ratio or PT
primary and secondary values.
Check current to match rated current.
Check current transformer ratio or CT
primary and secondary values.
Power measurement
is not correct.
Check system type setting: 4-wire star
or 3-wire delta
Check phase sequence of voltages and
currents
Check sequence of CT connection
Power supply for sttus
inputs is not correct.
Check external contacts.
Check external connections.
Relay mode is not
correct.
Relay
does
not
receive an external
command..
Delay time has not
been set correctly..
The pulse output is
deactivated or wrong
measured quantity or
wrong pulse weight is
set.
Meter
wrong.
address
is
- 52 -
Weigel Meßgeräte GmbH
P.O.B. 720 154 D–90241 Nürnberg Phone: 0911 / 4 23 47–0
Erlenstraße 14 D–90441 Nürnberg
Fax: 0911 / 4 23 47–39
Management:
Phone: 0911 / 4 23 47–94
Internet:
http://www.weigel-messgeraete.de
e-mail:
vertrieb@weigel-messgeraete.de
Check programming.
Check programming.
Check communication.
Check programming.
Check programming.
Check if the address of the meter is set
correctly, or if there is more than one
meter with the same address on the
bus.
Operating Manual
679.B.141.04
Digital Multifunctional
Power Meter with LCD
Display and Optional
Modules
Baud rate is wrong.
Check baud rate.
The communication
line has not been
correctly connected to
the terminal resistor.
Check if the 120 Ohm resistor has been
connected only to the last device.
The communication
line suffers
interference.
Check if the communication-shielding
layer has been earthed effectively.
The communication
line is interrupted.
Check if the communication cable has
been disconnected.
13. Technical Data
see the Data Sheet 679.D.141.xx
- Specifications subject to change without notice; date of issue; Stand 01/15 -
- 53 -