MANUAL No. 20606E1.1
Published in Jul. 2006
Revised in Sep. 2007
VM-21 Series
VM-21P
3-WIRE LVDT SIGNAL CONDITIONER
INSTRUCTION MANUAL
z Carefully read and understand this manual before using this equipment.
z After reading this manual, store it in a safe location where it can be
consulted at any time.
Thank you for purchasing the VM-21 Series VM-21P 3-Wire LVDT Signal Conditioner.
This instruction manual explains the operation of and cautionary instructions for the VM-21 Series
VM-21P 3-Wire LVDT Signal Conditioner.
VM-21P 3-Wire LVDT Signal Conditioner Instruction Manual
Important Information
▌Important Information▐
► Carefully read and understand this manual before using this product. After reading this manual,
store it in a safe location where it can be consulted at any time.
► If you have any questions regarding this manual or the product, contact the sales office where it
was purchased for assistance.
► When using this product, it is necessary to be knowledgeable about not only the information in
this manual, but also any instrumentation that is connected to this product. Also, general
knowledge about safety is required in addition to the safety information provided in this manual.
► The VM-21 Series uses a variety of noise tests to evaluate EMC (electro-magnetic compatibility).
However, since the following environmental conditions will cause fluctuations in EMC
characteristics, it is important to ensure the stability of the system according to the cautionary
instructions found in this manual.
y
Volume of noise produced
y
Temperature and humidity
y
Equipment layout
► If this product is combined with other instrumentation and then resold or transferred as part of an
assembly, be sure that this manual is given to the end user.
► When disposing of this product, follow all local laws and regulations.
► This product is used in combination with the VM-21G Signal Conditioner socket and the VM-21H
backplane unit (sold separately). Some descriptions of these parts are included in this manual,
when explaining how to install and wire this product.
► The illustrations in this manual of parts that are sold separately may differ from their actual
appearance.
► The company and product names appearing in this manual are the trademarks and registered
trademarks of those companies.
► Shinkawa Sensor Technology, Inc. owns the copyright to this manual. No part of this manual
may be made public or copied/duplicated in any manner without permission.
VM-21P 3-Wire LVDT Signal Conditioner Instruction Manual
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Important Information
▌Liability▐
► Shinkawa Sensor Technology, Inc. shall not be liable for any damage or injury that occurs as a
result of failure to observe the instructions in this manual, or careless operation or installation of
this product.
► Compensation shall not be made for any damage, injury, or loss that occurs as a direct or
indirect result of the incorrect use, improper use, modification, or disassembly of this product.
► Shinkawa Sensor Technology, Inc. does not provide, implicitly or otherwise, any guarantee for
merchantability, specific uses, or patent violation, beyond what is indicated in this manual and
warranty provisions.
► The warranty provisions for this product are included at the back of this manual. In the event of
trouble with this product, repairs will be performed according to these warranty provisions.
► Shinkawa Sensor Technology, Inc. shall not be liable for any trouble that occurs as a result of
the use of parts other than those that have been recommended.
▌Checking the Product and Packaging▐
Shinkawa Sensor Technology, Inc. performs vigorous quality control and quality inspections, to
provide highly reliable products.
When this product is delivered, make sure it is the product that was ordered, and check for any
damage that may have occurred during shipment and any missing accessories.
If the product is damaged or accessories are missing, contact the sales office where the product
was purchased for assistance.
In addition to this manual, the following product is included:
● VM-21P 3-Wire LVDT Signal Conditioner (this product)
● VM-21G Signal Conditioner Socket
1章
VM-21P 3-Wire LVDT Signal Conditioner Instruction Manual
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Contents
▌Contents▐
Page
Important Information .............................................................................................................1
Liability ...................................................................................................................................2
Checking the Product and Packaging ....................................................................................2
Section 1
Safety Information ..............................................................................................4
1.1 Warning symbols........................................................................................4
1.2 Cautions .....................................................................................................4
Section 2
Introduction.........................................................................................................6
2.1 Scope of application ...................................................................................6
2.2 Specifications .............................................................................................6
2.2.1 Product specifications .....................................................................6
2.2.2
VM-21G Signal Conditioner Socket
Specifications ..................................................................................8
2.2.3 VM-21H Backplane Unit (sold separately) Specifications ...............9
2.2.4 VM-21H Backplane Unit (sold separately)
Expansion Specifications ..............................................................11
2.3 External dimensions and part names .......................................................12
2.3.1 External dimensions and part names............................................12
2.3.2
VM-21G Signal Conditioner Socket
External dimensions and part names............................................12
2.3.3 VM-21H Backplane Unit (sold separately)
External dimensions and part names............................................13
Section 3
Installation ........................................................................................................14
3.1 Installation environment ...........................................................................15
3.2 Installing the product ................................................................................17
3.2.1 Using a signal conditioner socket for installation ..........................17
3.2.2 Using a backplane unit for installation...........................................19
3.3 Wire connections......................................................................................20
3.3.1 Connecting the transducer ............................................................20
3.3.2 Connecting the output signal receiver...........................................25
3.3.3 Connecting the power supply........................................................26
3.3.4 Checking connections ...................................................................27
Section 4
Corrections .......................................................................................................28
4.1 Correction preparation..............................................................................28
4.2 Correcting the product..............................................................................29
Section 5
Maintenance and Inspections ...........................................................................30
5.1 Regular inspections..................................................................................30
5.2 Product life ...............................................................................................30
5.3 Troubleshooting........................................................................................30
VM-21P 3-Wire LVDT Signal Conditioner Instruction Manual
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Section 1
Section 1
Safety Information
Safety Information
Read this section carefully in order to use this product safely.
1.1
Warning symbols
The following symbols are shown with information in this manual that must be observed in order
to prevent situations that are hazardous to the user and/or could cause property damage, and to
use this product safely. Carefully read and follow the instructions.
Warning symbol
Meaning
This symbol is used to warn against the possibility of serious or
WARNING
fatal injury. Follow the instructions to ensure safety.
This symbol is used to caution against the possibility of injury.
CAUTION
Follow the instructions to ensure safety.
This symbol is used to draw attention to the possibility of property
ATTENTION
damage.
Follow the instructions to prevent damage to equipment.
Point
1.2
Point is used to emphasize important instructions, and provide helpful
information.
Cautions
Be sure to observe the following to ensure safety when using this product.
▌Prohibited Actions▐
WARNING
DO NOT disassemble or modify this product. Also, do not use it with any standards other than
what is indicated in the specifications.
Doing so could result in damage to the product, fire, or injury.
ATTENTION
Do not use wireless equipment, such as transceivers, or handy phones around this product.
Exposing this product, the signal cables, or the transducer to electromagnetic waves could
result in a reduction in the precision indicated in the specifications.
VM-21P 3-Wire LVDT Signal Conditioner Instruction Manual
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Section 1 Safety Information
▌Required Actions▐
WARNING
When installing this product, be sure to follow the procedure explained in “Section 3
Installation”.
Failure to do so could result in damage to the product, fire, or injury.
ATTENTION
● Before using this product, be sure to read the instruction manuals for the equipment to
which it is connected.
Specialized knowledge of both equipment and related instrumentation is required to use
this product.
● Before touching this product, be sure to touch a nearby metal area to discharge any static
electricity.
Failure to do so could cause this product to be damaged by static electricity that has built
up in your body.
● Use a delayed circuit protector.
Failure to do so could result in the product becoming damaged by the inrush electrical
current when the power supply is turned on. The level of inrush current is several times
greater than normal input current. (The level of inrush current will differ depending upon
the timing when the power supply is turned on, and the impedance of the supply source.)
● When performing a mega test (insulation test) on signal transmission cables, be sure to
remove the cables from the driver (transducer) and signal conditioner.
In addition, be sure to short-circuit the cables before reconnecting them after a mega test
to discharge any electrical charge.
Connecting cables with an electrical charge to the driver or signal conditioner could result
in damage to the product.
● Perform the following measures to ensure the stability of the system.
- Be sure to install surge killers on the product and related equipment, as well as on the
relays around the signal cables connecting the equipment.
- Tighten installation screws to securely fix all units.
- Install an interlock function on the system to prevent misoperation in the event of
trouble with the product.
● If any of the following situations occur, stop using the product and contact the sales office
where it was purchased for assistance.
Continuing to use the product in abnormal conditions could result in fire or damage.
- When the product emits foul odors
- When the product becomes abnormally hot
- When the product falls or is dropped
- When the product’s case becomes damaged
● When storing the product, place it in a location free from direct sunlight. Store it in a
location free from high temperature, high humidity, and corrosive gas.
- Temperature: −40 to 70°C
- Humidity: 10 to 90％ RH (no condensation)
VM-21P 3-Wire LVDT Signal Conditioner Instruction Manual
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Section 2
Section 2
2.1
Introduction
Introduction
Scope of application
This product is used in combination with either the VM-21G Signal Conditioner Socket, or the
VM-21H Backplane Unit (sold separately), and receives signals from a 3-WIRE LVDT SIGNAL
CONDITIONER (LVDT), and converts them to insulated 4 to 20mA DC or 1 to 5V DC.
Do not use for any other purposes.
2.2
Specifications
2.2.1
Product specifications
VM-21P
Power supply
1
2
Measuring range
24VDC
20
100 to 240VAC/DC 21
22
23
24
25
26
27
28
30
31
Input LVDT
Measuring Range
Output (isolated)
I/O Conversion Accuracy
Response Speed
Polarity
Burn-down Function *1
T.P. Output (test point
output for confirmation null
point)
Output for LVDT Excitation
Supply Permissible Voltage
Power Consumption
Insulation Resistance
Withstanding Voltage
Operating Temperature
Relative Humidity
Casing Material (color)
Weight
CE Marking
*1
25mm
50mm
75mm
100mm
150mm
200mm
250mm
300mm
350mm
400mm
450mm
Input LVDT
S
LS Series
-
S
Full range of
input LVDT
050
50mm
100
100mm
150
150mm
200
200mm
250
250mm
300
300mm
350
350mm
400
400mm
450
450mm
Output
1
2
1 to 5VDC
4 to 20mADC
Conditioner socket
0
1
Without
Include
Standard
LS Series
See Model Code above
1 to 5VDC (output resistance: 250Ω) or 4 to 20mADC (permissible load resistance: 600Ω or less)
±1% of F.S. at 25°C, ±2% of F.S. at 0 to 50°C
Deviation from an ideal linear output of voltage or current in combination with LS Series LVDT.
However, when measuring range and full range of input LVDT are the same.
τ=45ms, 90% response
Can be changed by wiring
Detects transducer failure and causes the 4 to 20mADC (1 to 5VDC) output to go to less than
0.8mADC (0.2VDC).
Output 0V when core position is on Null point.
Output impedance: 100Ω
Voltage: 5Vrms, Frequency: 3kHz, Max. current: 50mA, Sine wave
24VDC±10% or 85 to 264VAC/DC (50/60Hz)
24VDC: 3.5W, 100-240VDC: 3.5W, 100-240VAC: 10VA
100 MΩ minimum at 500VDC between input-output-power-GND mutually.
2000VAC for one minute between input-output-power-GND mutually.
(With VM-21H: 1,000VAC between output-GND.)
0 to 50°C (32 to 122°F REF.)
10 to 90%RH (no condensation)
Modified polyphenylene oxide (black)
Approx. 110g (0.24lb)
Only as for 24VDC power supply specifications.
Abnormal condition
• When there is an abnormality in the LVDT or signal cable (breaking in LVDT wiring, breaking or short circuit in signal cable).
• When there is an abnormality in LVDT excitation output (oscillation has stopped).
VM-21P 3-Wire LVDT Signal Conditioner Instruction Manual
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Section 2 Introduction
ATTENTION
● Standard specifications, when measuring range and full range of input LVDT are the same.
● Satisfy the following when using LS Series LVDT :
1≦
Full range of input LVDT
≦2
Measuring range
● Satisfy the following when using single coil type LVDT except LS Series LVDT :
1)Impedance
At 50% (Null point)
500 to 700Ω
(between A and C)
Within LVDT stroke
More than 400Ω
Core comes out
Less than 250Ω
2) 4.33 × LVDT sensitivity (mV/mm/V) × Measuring range (mm) ≧1,000
● This signal conditioner does not support the zero shift function, so the null point is always the center
position of measurement.
● Abnormal condition
- When there is an abnormality in the LVDT or signal cable (breaking in LVDT wiring, breaking or short
circuit in signal cable).
However, there may be some instances where these conditions will not be detected.
-When there is an abnormality in LVDT excitation output (oscillation has stopped).
Burn-down function:
The burn-down function is used to reduce output to indicate that the product is not taking measurements.
The burn-down function is used in the following situations to reduce output to F.S. –20% (0.8mA DC or
0.2V DC) or lower.
● When there is an abnormality in the LVDT or signal cable (breaking in LVDT wiring, breaking or short
circuit in signal cable)
● When there is an abnormality in LVDT excitation output (oscillation has stopped)
The delay will be triggered and the burn-down function continued in the following situations.
● Approximately 10 seconds after a normal input signal is recovered
● Approximately 10 seconds after the power supply is turned on
VM-21P 3-Wire LVDT Signal Conditioner Instruction Manual
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Section 2
2.2.2
VM-21G Signal Conditioner socket
specifications
Terminal screw size
Number of signal
conditioner mounting
stands
Operation temperature
M3
0 to 50°C
Relative humidity
10 to 90%RH (no condensation)
Installation method
DIN Rail, Wall-mounted
Case material (color)
Polyphenylene oxide with glass fiber (black)
Mass
Approx. 50g (0.11lb)
1
▌Terminal Arrangement▐
Terminal
No.
1
2
3
4
5
6
7
8
9
10
11
Signal
INPUT(A)
INPUT(B)
INPUT(C)
T.P.OUT－
T.P.OUT＋
OUTPUT＋
GND
OUTPUT－
SUPPLY＋(L)
SUPPLY－(N)
When using above signals, refer to “3.3 Wire connections” (☞ Page 20)
VM-21P 3-Wire LVDT Signal Conditioner Instruction Manual
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Introduction
Section 2 Introduction
2.2.3
VM-21H BACKPLANE UNIT (sold separately) specifications
VM-21H
Power supply
1
2
Terminal screw size
Connector
specifications
24VDC
100-240VAC/DC
M3.5
MASTER: D-Sub25P (socket)
Housing lock screws: #4-40
Recommended connector for plug side: DB-25PF-N [Japan Aviation
Electronics Industry, Ltd.]
SLAVE:
D-Sub25P (socket)
Housing lock screws: #4-40
Recommended connector for plug side: DB-25PF-N [Japan Aviation
Electronics Industry, Ltd.]
OUTPUT: Panel connector 56P (socket)
Recommended connector for plug side: 00-8016-056 [Kyocera Elco
Corporation]
Number of signal
conditioner mounting
stands
8 Max.
Redundant power
supply
When selecting the power supply of 24V DC (VM-21H1), it is possible to make the
power supply redundant by inputting a secondary 24V DC power supply. However, a
redundant AC power supply, or a redundant power supply with input from an AC
power supply and a DC power supply are not possible.
Operation
temperature
Relative humidity
10 to 90%RH (no condensation)
Installation method
Rack-mounted, wall-mounted
Case material (color)
SPCC (black)
Mass
Approx. 2.2kg (4.85lb)
0 to 50°C
▌Terminal Arrangement▐
Terminal
No.
1
2
3
4
5
6
Signal
INPUT(A)
INPUT(B)
INPUT(C)
T.P.OUT－
T.P.OUT＋
VM-21P 3-Wire LVDT Signal Conditioner Instruction Manual
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Section 2
Introduction
▌MASTER, SLAVE, OUTPUT Pin Assignments▐
MASTER Pin Assignments
SLAVE Pin Assignments
Pin
Signal
Pin
Signal
1
2
3
4
5
6
7
8
OUT1
COM1
OUT2
COM2
OUT3
COM3
OUT4
COM4
9
OUT5
10
COM5
11
OUT6
12
COM6
13
OUT7
14
COM7
15
OUT8
16
COM8
17 to 25
Pin
1
2
3
4
5
6
7
8
OUTPUT
connection
(Signal )
LL (OUT9)
MM (COM9)
CC (OUT10)
HH (COM10)
t (OUT11)
x (COM11)
j (OUT12)
m (COM12)
Pin
9
10
11
12
13
14
15
16
17 to 25
OUTPUT
connection
（Signal ）
f (OUT13)
c (COM13)
Z (OUT14)
U (COM14)
P (OUT15)
C (COM15)
N (OUT16)
C (COM16)
OUTPUT Pin Assignments
Pin
Signal
A
Pin
Signal
K
Pin
Signal
Pin
Signal
Pin
Signal
Pin
U
COM 14
c
COM 13
m
COM 12
w
B
COM 8
L
OUT7
V
C
COM 16
M
OUT8
W
N
P
OUT16
X
Y
D
E
F
COM 7
H
S
J
T
COM 15
OUT15
R
Z
COM 6
d
OUT6
OUT14
n
e
OUT5
p
f
h
OUT13
OUT4
r
s
j
OUT12
t
x
OUT3
OUT11
Signal
EE
COM 2
FF
HH
OUT1
OUT9
LL
COM 1
OUT10
MM
COM 9
CC
b
l
v
DD
OUT2
JJ
KK
NN
▌Power Supply Terminal Arrangement▐
Terminal
No.
1
2
3
4
5
24VDCPower
Supply
Specifications
＋
－
＋
－
GND
100-240VACPower
Supply
Specifications
100-240VDCPower
Supply
Specifications
L
N
GND
＋
－
GND
<24V DC Power Supply Specifications>
<100 to 240V AC/DC Power Supply Specifications>
VM-21P 3-Wire LVDT Signal Conditioner Instruction Manual
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COM 10
BB
u
COM 3
Pin
z
AA
k
COM 4
COM 11
y
a
COM 5
Signal
Section 2 Introduction
2.2.4
VM-21H BACKPLANE UNIT (sold separately) Expansion Specifications
The output signal from an expansion backplane unit can be output from the first backplane unit.
D-Sub25P Cable Specifications
D-Sub25P
D-Sub25P
25
―
―
―
••• •
(plug)
1
2
3
―
Backplane Unit A
(plug)
1
2
3
SLOT 1
SLOT 2
SLOT 3 SLOT 4
SLOT 5
SLOT 6
SLOT 7
SLOT 8
SLOT 7
SLOT 8
25
(straight connection)
Backplane Unit B (expansion)
SLOT 1
SLOT 2
SLOT 3 SLOT 4
SLOT 5
SLOT 6
OUTPUT Cable Pin Assignment
Pin
AA
KK
LL
z
DD
EE
p
u
v
h
k
l
e
a
b
W
R
S
L
E
F
M
A
B
Backplane Unit A
SLOT No.
Signal Name
OUT1
SLOT 1
―
COM1
OUT2
SLOT 2
―
COM2
OUT3
SLOT 3
―
COM3
OUT4
SLOT 4
―
COM4
OUT5
SLOT 5
―
COM5
OUT6
SLOT 6
―
COM6
OUT7
SLOT 7
―
COM7
OUT8
SLOT 8
―
COM8
Pin
BB
NN
MM
CC
JJ
HH
t
y
x
j
n
m
f
d
c
Z
V
U
P
K
J
N
D
C
Backplane Unit B
SLOT No.
SLOT 1
SLOT 2
SLOT 3
SLOT 4
SLOT 5
SLOT 6
SLOT 7
SLOT 8
VM-21P 3-Wire LVDT Signal Conditioner Instruction Manual
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Signal Name
OUT9
―
COM9
OUT10
―
COM10
OUT11
―
COM11
OUT12
―
COM12
OUT13
―
COM13
OUT14
―
COM14
OUT15
―
COM15
OUT16
―
COM16
Section 2
2.3
External Dimensions and Part Names
2.3.1
Product External Dimensions and Part Names
Units: mm
Zero Adjustment
Potentiometer
Span Adjustment
Potentiometer
2.3.2
Installation
Screw
VM-21G Signal Conditioner socket
Mounting hole
External Dimensions and Part Names
Input Terminal
Units: mm
DIN Rail
Output / Power Supply
Terminal
VM-21P 3-Wire LVDT Signal Conditioner Instruction Manual
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Introduction
Section 2 Introduction
2.3.3
VM-21H BACKPLANE UNIT (sold separately) External Dimensions and Part Names
Units: mm
Mounting hole
Input Terminal
Input Terminal
Power Supply Terminal
VM-21P 3-Wire LVDT Signal Conditioner Instruction Manual
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Section 3
Section 3
Installation
Installation
WARNING
● Installation, wiring, and wire connections should be performed by a qualified technician.
● Be sure to install an earth wire. In addition, DO NOT turn on the power before all wiring
and wire connection work is complete. Doing so could result in electric shock.
ATTENTION
● Before touching this product, be sure to touch a nearby metal area connected to ground to
discharge any static electricity.
Failure to do so could cause this product to be damaged by static electricity that has built
up in your body.
● Make sure that all wiring has been connected correctly before turning the power on.
Failure to do so could result in damage to the product or fire.
● Install this product away from motors and relays.
In addition, do not install the input and output signal cables near electrical cables or control
cables. Noise from motors and relays could adversely affect the product. It is
recommended that wiring ducts be kept separate.
● When using shielded cable, keep the length of unshielded areas as short as possible.
(less than 100mm recommended)
Otherwise, the signal may become unstable.
● When installation work is complete, be sure to check the installation conditions.
Check carefully to make sure the product will not fall and trouble.
Point
VM-21G Signal Conditioner socket
is abbreviated as “signal conditioner socket”.
VM-21H Backplane Unit (sold separately) is abbreviated as “Backplane Unit”.
VM-21P 3-Wire LVDT Signal Conditioner Instruction Manual
- 14 -
Section 3 Installation
3.1
Installation environment
Install this product in a location that satisfies the following environment and installation
conditions.
Point
VM-21G Signal Conditioner Socket is abbreviated as “signal conditioner socket”.
VM-21H Backplane Unit (sold separately) is abbreviated as “Backplane Unit”.
▌Environment Conditions▐
0 to 50°C when the equipment is operational
● Ambient
temperature:
● Ambient
10 to 90％RH (no condensation) when the equipment is operational
humidity:
● Vibration:
2m/s or less at 10 to 150Hz
● Air
An air dust volume of 0.2mg/m3 or less is preferred.
cleanliness:
In addition, there should be very little corrosive gas, such as hydrogen
sulfide, zincate gas, and chlorine, and electrically conductive particles,
such as iron and carbon.
(The tolerable levels of hydrogen sulfide and zincate gas are based on
JEIDA-63.)
JEIDA:
Japan Electronics and Information Technology Industries
Association JEIDA-63
Hydrogen sulfide: 0.01ppm or less
Zincate gas:
0.05ppm or less
(Ambient temperature: 25°C ± 5°C, Humidity: 40 to 80％RH)
▌Installation Conditions▐
● Refer to the illustrations below to maintain the required spacing. This product is installed
using either a signal conditioner socket or a backplane unit.
● To install this product in a cabinet, it needs to be cooled with a forced-air cooling apparatus.
● Do not install this product on a heat-generating object.
● If there is a bottom plate underneath, maintain at least 100mm of distance from the bottom
plate.
VM-21P 3-Wire LVDT Signal Conditioner Instruction Manual
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Section 3
„ Using a signal conditioner
socket for installation
Installation
„ Using a backplane unit
for installation
Air-cooling fan or
exhaust opening
Air-cooling fan or
exhaust opening
100mm or more
100mm or more
128mm or more
78mm or more
If there is a wall or other object
behind the product, leave at
least 60mm of distance.
VM-21P 3-Wire LVDT Signal Conditioner Instruction Manual
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Section 3 Installation
3.2
Installing the product
Use one of the following methods to install the product. Install the product as appropriate,
maintaining the required space indicated in the installation conditions.
● Use a signal conditioner socket to install the product to a wall. (☞ Page 17)
● Use a signal conditioner socket to install the product to a DIN rail. (☞ Page 18)
● Use a backplane unit to install the product to a rack or wall. (☞ Page 19)
3.2.1
Using a signal conditioner socket for installation
You can use a signal conditioner socket to install this product to a wall or DIN rail.
▌Wall Installation▐
Use the following installation procedure.
1
Install the signal conditioner socket to the
wall.
2
Wire the signal conditioner socket, and then
install the product to the signal conditioner
socket.
Installation screw
Units: mm
Installation Dimensions
VM-21P 3-Wire LVDT Signal Conditioner Instruction Manual
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Section 3
Installation
▌DIN Rail Installation▐
Use the following installation procedure.
1
Fit the upper tabs on the back of the signal
conditioner socket into the DIN rail.
2
Pull the slide lock while pushing the signal
DIN rail
Upper tab
conditioner socket onto the DIN rail.
Slide lock
3
Make sure the upper tabs and slide lock
have clamped onto the DIN rail.
DIN rail
4
Fix the DIN rail.
5
Wire the signal conditioner socket, and then
install the product to the signal conditioner
socket.
DIN rail
Installation screw
Point
The signal conditioner socket can be removed by using a flathead
screwdriver to push the slide lock down.
VM-21P 3-Wire LVDT Signal Conditioner Instruction Manual
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Section 3 Installation
3.2.2
Using a backplane unit for installation
You can use a backplane unit to install the product closely appressed to a wall or 19-inch rack
panel.
Use the following installation procedure.
1
Install the backplane unit onto the
installation angles or the wall.
2
Wire the backplane unit, and then install
the product to the backplane unit.
Installation angle
Installation screw
Units: mm
Installation Dimensions
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Section 3
3.3
Installation
Wire connections
WARNING
● Wiring and wire connections should be performed by a qualified technician.
● Be sure to install an earth wire. In addition, DO NOT turn on the power before all wiring
and wire connection work is complete. Doing so could result in electric shock.
Make wire connections in the following order.
1. Connect the transducer.
2. Connect the output signal receiver.
3. Connect the power supply.
4. Check all connections.
Point
Flexible, stranded electrical wire is recommended for wiring. Round,
crimped terminals (JIS C 2805, or similar) with good contact and resistant
to degradation over time are recommended.
3.3.1
Connecting the transducer
Connect the transducer as explained below.
● It is recommended that you use a 0.75 to 2mm2 3-wire shielded cable
Point
between the signal conditioner socket and junction terminal, or
backplane unit and junction terminal.
●
It is recommended that non-shielded areas be kept to a length of no
more than 100mm.
VM-21P 3-Wire LVDT Signal Conditioner Instruction Manual
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Section 3 Installation
„ When using a signal conditioner socket (using LS-□□□C)
LS-□□□C
PIN SYMBOL
A
B
C
D
E
Point
WIRE
NAME
A
B
C
VM-21G
TERMINAL NO.
1
2
3
Shield
3
Connect a shield of wire cable to signal line (C) in the signal conditioner side.
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Section 3
Installation
„ When using a signal conditioner socket (using LS-□□□T)
Ａ
Ｂ
Ｃ
LS-□□□T
TERMINAL
SYMBOL
A
B
C
WIRE
NAME
VM-21G
TERMINAL NO.
A
B
C
Shield
1
2
3
3
ATTENTION
● In case of specification of reverse polarity , doth connect the NO.1 terminal of
conditioner of C terminal of LVDT and the NO.3 terminal of conditioner of A terminal of
LVDT.
● Refer to (☞ Page 29) on polarity.
● In addition , connect a shield to the terminal NO.3 by all means.
Point
Connect a shield of wire cable to signal line (C) in the signal conditioner side.
VM-21P 3-Wire LVDT Signal Conditioner Instruction Manual
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Section 3 Installation
„ When using a backplane unit (using LS-□□□C)
LS-□□□C
PIN SYMBOL
A
B
C
D
E
Point
WIRE
NAME
A
B
C
VM-21H
TERMINAL NO.
1
2
3
Shield
3
When connecting to slots 2 through 8, connect in the same way as Slot 1.
Connect a shield of wire cable to signal line (C) in the signal conditioner side.
VM-21P 3-Wire LVDT Signal Conditioner Instruction Manual
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Section 3
Installation
„ When using a backplane unit (using LS-□□□T)
Ｂ
Ａ
Ｃ
LS-□□□T
TERMINAL
SYMBOL
A
B
C
Point
WIRE
NAME
VM-21H
TERMINAL NO.
A
B
C
Shield
1
2
3
3
When connecting to slots 2 through 8, connect in the same way as Slot 1.
Connect a shield of wire cable to signal line (C) in the signal conditioner side.
VM-21P 3-Wire LVDT Signal Conditioner Instruction Manual
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Section 3 Installation
3.3.2
Connecting the output signal receiver
Connect the output signal receiver as explained below.
Point
Tool-grade vinyl code (VSF) stranded wire (JIS C 3306, or similar) with a
nominal conductor sectional area of 0.5 to 0.75mm2, or similar product, is
recommended for signal wire.
„ When using a signal conditioner socket
Output signal
receiver
„ When using a backplane unit
Output signal
receiver
Point
To expand the backplane unit, refer to “2.2.4 VM-21H BACKPLANE UNIT
(sold separately) Expansion Specifications” (☞ Page 11).
VM-21P 3-Wire LVDT Signal Conditioner Instruction Manual
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Section 3
3.3.3
Installation
Connecting the power supply
Connect the power supply as explained below.
Point
600V vinyl code (IV) stranded wire (JIS C 3307, or similar) with a nominal
conductor sectional area of 1.25 to 2.0mm2, or similar product, is
recommended for electric wire.
„ When using a signal conditioner socket
„ When using a backplane unit
<24V DC power supply specifications>
Connect wires as shown in figure when the redundant is necessary for the power supply.
But,there is not priority to ①,②.
Connect either ① or ② with power supply when the redundant is not necessary .
<100 to 240V AC/DC power supply specifications>
VM-21P 3-Wire LVDT Signal Conditioner Instruction Manual
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Section 3 Installation
3.3.4
Checking connections
Check the following before turning on the power supply.
● Make sure there is no looseness in connection terminals, and that all wiring has been
connected correctly.
● Make sure that the wiring for the power supply is connected to one of the power supplies
indicated below.
24V DC power supply specifications: 24VDC ± 10％
100-240V AC/DC power supply specifications: 85 to 264VAC/DC
● Make sure the product is installed in a location that satisfies the installation environment
requirements.
In particular, make sure there are no flaws in the installation of the product, and that it has
not been installed in any of the following types of areas.
-
Areas with high temperature or high humidity
-
Areas with a large amount of dust
-
Areas susceptible to vibration
This completes the installation of the product.
Make corrections as necessary after assembling this product with other instrumentation.
(☞ Page 28)
Point
The output of this product might overshoot , when the power supply is torned on.
Be afraid of need , please establish a safe system.
VM-21P 3-Wire LVDT Signal Conditioner Instruction Manual
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Section 4
Section 4
Corrections
Corrections
To maintain the performance of this product, make corrections in the following instances.
● When turning on the power supply for the first time
● When 1 year has passed since the previous correction
● When the performance of the product has dropped for some reason
4.1
Correction preparations
ATTENTION
● The T.P. output signal is not insulated from the input signal.
● The common for the T.P. output signal should be insulated from the ground to prevent
noise.
Place a T.P.output signal receiver as shown below, and make corrections.
Refer to “4.2 Correcting the product” (☞ Page 29) for the procedure for making corrections.
„ When using a signal conditioner socket
Digital multimeter
„ When using a backplane unit
Digital multimeter
Point
The example in the illustration shows a connection to Slot 1. If a
connection is made to a different slot, make connections in the same way
to terminals 5 and 6.
VM-21P 3-Wire LVDT Signal Conditioner Instruction Manual
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Section 4 Corrections
4.2
Correcting the product
Use the following procedure to make corrections.
1
Turn on the power supply.
2
Move the LVDT core so that the T.P. output
becomes 0.00V.
3
Adjust the zero adjustment volume until the
4
Move the LVDT core to the 100% position on
the measuring range.
5
Adjust the span adjustment volume until the
Zero adjustment
Potentiometer
Span adjustment
Potentiometer
output is 3V or 12mA.
output is 5V or 20mA.
Extension rod-end Extension rod-end
toward LVDT
away from LVDT
6
Repeat steps 2 through 5 until the I/O
Direct
Polarity
Increase
Decrease
conversion precision satisfies the values
indicated in the specifications.
Reverse
Polarity
Decrease
Increase
Point
●
The product has a zero shift function (approx. 25%).
●
The measurement range of this product is always centered on the null
point.
If corrections are completed successfully, the input/output conversion precision indicated in the
specifications will be met within approximately 5 minutes after the next time the power supply is
turned on.
If the product does not operate correctly according to the specifications, contact the sales office
where it was purchased for assistance.
VM-21P 3-Wire LVDT Signal Conditioner Instruction Manual
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Section 5
Section 5
Maintenance and Inspections
Maintenance and Inspections
The maintenance and inspections for this product are explained in this section.
5.1
Regular inspections
Recommend corrections once annually to maintain product performance and ensure system
stability.
Refer to “Section 4 Corrections” for more information about the procedure for performing
corrections. (☞ Page 28)
5.2
Product life
As long as there are no abnormalities with the product, in the case of using in room temperature
(25°C), it should have a recommended service life of 10 years.
Product life decrease as room temperature increases.
Point
Service life may be shorter than 10 years due to the surrounding
environment. To ensure system stability, it is recommended to replace the
product earlier when necessary.
5.3
Troubleshooting
Solutions for possible trouble with this product are described below.
Symptom
Output dose not out more
than 10 seconds.
Input/output conversion
precision is not in line with
the specifications.
Possible Cause
The power supply is not
turned on.
Solution
Turn on the power supply.
Cable or Connection of
LVDT is breaking.
Confirm connection of cable or LVDT.
Wires have not been
connected correctly.
Refer to “Section 3.3 Connecting
wires” to connect wires correctly.
(☞ Page 20)
Core of LVDT drop out.
Confirm LVDT.
Corrections have not
been performed
correctly.
Refer to “Section 4 Corrections” to
perform corrections. (☞ Page 28)
VM-21P 3-Wire LVDT Signal Conditioner Instruction Manual
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▌Warranty Provisions▐
The warranty for this product is as follows.
1. Warranty conditions for newly delivered products
The warranty periods for delivered products shall be 3 years from the date they are
shipped from Shinkawa Sensor Technology, Inc. (The warranty period for special
products and software shall be 1 year.) If Shinkawa liable for a fault in a Shinkawa
product that occurs during this warranty period, the replacement and/or repair of that
product shall be performed at a Shinkawa factory at Shinkawa’s expense.
In addition, if it becomes necessary to send a technician to perform repairs during the
warranty period, Shinkawa shall covercharge travel expenses based on Shinkawa
regulations. In addition, such cases, repair fees shall be provided by Shinkawa.
However, the following situations do not apply, and are excluded from warranty.
(1) Inappropriate use and/or operation by the user
(2) Faults attributable to some other cause for which Shinkawa is not liable
(3) Modifications or repairs performed by someone other than Shinkawa or personnel
comissioned by Shinkawa
(4) Operation, storage, and/or use in a severe environment that exceeds the design
specifications
(5) Fire, flood, earthquake, lightening, or other natural disaster
(6) Consumable
(7) Any other fault for which Shinkawa is not liable
Warranty as used herein is limited to the individual product that has been delivered;
Shinkawa shall be exempt from any liability regarding damage caused either directly or
indirectly as a result of a fault in a delivered product.
Notwithstanding the warranty provisions hereto, the manufacturer’s of all other
equipmentall parts manufacturers other than Shinkawa shall be liable for the warranty
periods and provisions of suchtheir own equipment.
2. Warranty conditions for repaired products
The warranty period for repaired products shall be for a period of 6 months after the
repair is complete, and shall be limited to the areas repaired.
All other conditions shall be as stipulated in Article 1, above.
Hiroshima Factory
4-22 Yoshikawa-kogyodanchi, Higashi-hiroshima 739-0153, Japan
Tel. +81-82-429-1118 Fax. +81-82-429-0804
[Field support & Repair Dept] E-Mail : service@sst.shinkawa.co.jp