SPECIFICATIONS
Zero Adjustment:
Variable range set by fixed resistors
Time Constant:
Adjustable up to 10 seconds,
others possible
Gain Range:
Typically 50:1, other ranges possible
Input Range:
±10 V
DPDT Relay Section:
➢ Jumper selectable
HI (+24V) or LOW (0VDC)
➢ May be used for latch/reset
operation, controlling an external
device, alarm, etc.
Temperature Range:
0°C to 50°C (32°F to 122°F)
Hysteresis:
±10 mV typical,
preset with fixed resistors
Power Consumption:
±50 mA @ ±15 V
100 mA @ 24 V with relay energized
Relay Contact Rating:
Consumption: 20.8 mA @ 24 VDC
Contact Rating: 2A @ 30 VDC,
50 VAC
Contact Form: DPDT
Operating Time: 7 mSec (max)
Release Time: 3 mSec (max)
Bounce Time: Oper. 0.5 mSec/
Rel. 3.5mSec
Form Factor:
Eurocard 100 x 160 mm, 7 HP, 3 U
Weight:
0.40 lb (0.18 kg)
The Dual DC Level Detector/Comparator card is designed to provide a
variable “window” width detection circuit on each channel. Front panel
controls and test points provide independent setting of level and window
width. Comparator status is indicated by front panel LED’s.The output
transistor may be used in an optional open collector mode, and the relay may
be configured for latch/reset operation. Input signals are summed at the input
amplifier, which has adjustable gain and zero.The summed signal feeds an
up/down integrator that provides a variable time delay, used to eliminate the
effects of transient over signal conditions.The comparator can also be
configured as a single detection circuit.
The NE123-212-1 Dual DC Level Detector/Comparator Card is a
forward compatible replacement for the E123-212-001.
FEATURES
➢
➢
➢
➢
➢
➢
➢
➢
Dual channel window comparator
Four inputs per channel
Summing input amplifier
Adjustable time delay
Status indication with LED’s
Two sets of dry contacts per window comparator
Transistor output option
Preset hysteresis
NE123-212-1 Series
Dual DC Level
Detector/Comparator
INSTALLATION AND SET-UP
TECHNICAL BACKGROUND:VARIABLE TIME DELAY
Adjustment Procedure: Preliminary Test Set-up &
Operational Verification
A “positive trigger pulse causes the up/down integrator output to “ramp”
from “high” to “low” for a time-delay interval approximately equal to:
1) All voltage readings are to be taken with respect to Pin-22 SIGNAL
COMMON unless otherwise specified.All Set-up procedures will be
referenced to Channel-1. Refer to schematic diagram for Channel-2
designations. Channel-1 & Channel-2 electronic functions are identical.
2) Ensure “Jumpers” on PC Board are as follows:
CH1:
JMPR1 ON
Relay latch/reset Operation
JMPR2 ON
Output Transistor Open Collector Mode
JMPR3 OFF Up/Down Integrator Time Delay
CH2:
JMPR4 ON
Relay latch/reset Operation
JMPR5 ON
Output Transistor Open Collector Mode
JMPR6 OFF Up/Down Integrator Time Delay
3) Ensure NE123-212 “Potentiometers” are pre-set as follows:
CH1 CH2
P1
P5
Full CCW
Gain Adjust
P2
P6
Full CCW
Time Adj (Integrator Time Delay)
P3
P7
Full CW
Level Adjust
P4
P8
Full CW
Window Adjust
R12
R62
Mid-Range
Zero Adjust (Offset or d-c Bias)
4) Observe front panel LED comparator status indicator lights:
CH1:
HI LED
LED3
RED
LO LED
LED2
RED
IN LED
LED1
GREEN
CH2:
HI LED
LED6
RED
LO LED
LED5
RED
IN LED
LED4
GREEN
5) Connect Jumper Wire across Pin-22 (Signal Common) and Pin-24
(Power Ground).
NOTE: Failure to connect both grounds together will result in incorrect
Comparator circuit operation and false transitions.
6) Check DC Offset Voltage at TP1. Ensure voltage is set for 0.00±0.01
VDC.‘Fine tune’ R12 if necessary to obtain 0.00 VDC atTP1.
7) Determine desired Input Voltage Range to be monitored. Comparator
max window range to be monitored is ±10.0 VDC.
8) Verify voltage reference points on front panel: Channel-1
TP1
Zero-1 Output Voltage Test Point
TPL1 Level-1 Reference level setting voltage
TPW1 Window-1 Upper/lower voltage limit setting
9) Apply +15 VDC to Pin-5 & -15 VDC to Pin-9 outputs for Relay (RL1)
contacts. Monitor Relay Contact output voltage at Pin-7.
10) Apply +1.00±0.05 VDC to Pin-2 (Command or Error Monitoring
Voltage Input).Verify -1.0±0.05 VDC at TP1 on front panel.
11) Verify 0.00±0.01 VDC at TPL1 (Level Set) on front panel.
12) Verify -2.0±0.01 VDC at TPW1 (Window limit set) on front panel.
13) Adjust input voltage to Pin-2 From +3 VDC to -3 VDC.
a. Adjust input voltage at Pin-2 for ≥ +2.1 VDC.
The “HI LED” (Red) on front panel will be “illuminated”.
Verify Relay Output Voltage at Pin-7 is -15.0±0.1 VDC.
b. Adjust input voltage at PIN-2 for ≤ 2.1 VDC.
The “LO LED” (Red) on front panel will be ”illuminated”.
Verify Relay Output Voltage at Pin-7 is -15.0±0.1 VDC.
c. Adjust input voltage at Pin-2 for ≤ -1.9 VDC and ≥ +1.9 VDC.
The “IN LED” (Green) on front panel will be “illuminated”.
Verify Relay Output Voltage at Pin-7 is +15.0±0.1 VDC.
14) The ZERO or DC BIAS adjustment Pot is used to minimize errors in
output voltage due to bias currents of op amps.
15) A small capacitor (C1 or C8) in the pf range is placed across feedback
loop to increase response time; ensure frequency stability; reduce noise
gain at high frequencies; prevent oscillation at hi-freq.
T=RxC
The variable delay time is determined by adjusting Potentiometer P2 (Time1) and Gain-1 Pot P1 for a Time Constant range of 0 to 10 Sec.The delay
time is determined as follows:
+10
(+Vsat)
0
C
(Vin)
JMPR3
ON
R17
A1
P2
TIME-1
Vo
1M
10K
0v
TP1
-10v
(-VSAT)
Vramp
T = (P2/R17) x (C) ≈ 0 to 10 Sec
Figure 6 – Variable Time-Delay
T = RC
RELAY RL1 AND RL2 SPECS
The relays are normally powered up by the incoming +24V power supply
@ Pin-20 which energizes the relay and N.O./N.C. contacts for Channel-1
at Pins 7, 9 (N.C.); 7, 5 (N.O.) & 11, 13 (N.O.).The jumpers JMPR1 &
JMPR4 provide capability of ‘ON/OFF’ options. In the ‘ON’ position, relays
RL1 & RL2 are energized by the +24V on-board power supply and will
remain energized as long as the input power supply is active. In the ‘OFF’
position, relays RL1 & RL2 can be externally controlled or energized by
another power supply or signal switching arrangement. Generally, the ‘ON’
position is used since this will activate relay. Pin-11 & Pin-25 can be used
for ‘relay trigger’. In the ‘relay trigger’ mode, connect Pin-11 (Ch1) and Pin25 (Ch2) to Power Gnd Pin-24. JMPR2 and JMPR5 must be in the ‘ON’
position for this to occur. JMPR2 can also be used as a relay logic jumper
for changing activation state of each relay.With JMPR1 or JMPR4 in the
‘ON’ position (+24V) and JMPR2 or JMPR5 in the ‘ON’ position, the relay
is in the “active-low state” (enabled-low). Grounding Pin-11 or 25 will
cause relay to activate. Relay energized by a low (0 VDC) logic signal may
be used for integrator reset, signal switching, alarm sensing, or other
functions.The N.O. contact at Pin-13 or 27 may be used for relay signal
switching.With jumper JMPR2 or JMPR4 in the ‘OFF’ position, the N.O.
contact ‘b’ across Pin-11, 13 (Ch1) or Pin-25, 27, may be used as an
auxiliary ‘dry contact’ brought out for controlling an external device, alarm,
etc. depending on the desired application & use.
N.O. Contact ‘a’ (relay RLI) across Pin-5 & 7, is an auxiliary dry contact
brought out for remote control status indication. Its purpose is to provide
remote indication by controlling output signal switching for such devices as
an external alarm, LED warning light, or other function to monitor status
condition from comparator such as HI, LO and IN led indicators provided
on the front panel of the NE123-212 comparator eurocard. For example,
the indicator may be used to signify whether the input voltage is above or
below (fault condition) the pre-set upper and lower threshold voltage, or if
it is operating within the pre-set voltage range.The contact ‘a’ status can
also indicate power failure (+24V) or interruption.
The Output Transistor (Q1 & Q5) may be used in an optional “open”
collector mode, and the relay (RL1 & RL2) may be configured for
“latch/reset” operations which has adjustable Gain and Zero span.
NE123-212-1 DUAL DC LEVEL DETECTOR/COMPARATOR SCHEMATIC
WINDOW-1
R24
+24V
0
JMPR1
LEVEL-1
P3 100K
R22
CW
TPL1
18.2K
UP / DOWN
INTEGRATOR-1
R14
10K
3 +
R2
2
2 -A1
1
100K
R3
4
49.9
10K
5 A1
+
100K
-
7
R15
P2
10K
100K
OFF
R20-1
100K
D3
13
12 A1
+
9
10 A1
+
D4
R21
27.4K
TP1
6
5 A2
+
14
R20-6
R18
1K
D5
13
7
D7
A2
+
R30
357
R26
49.9
14
3
7
RELAY-1
D6
9
10 A2
+
8
R33
NC
RL1
JMPR2
ON
1
R27
100K
13
16
10M
R28
2K
2
Q1
R38
1K
4.75K
R37
D9
68.1
1N4003
9 NO
11
5
9
+24V
2.74K
R31
D10
R41
4.75K
2.74K
D12
1N4003
1N4003
+24V
R40
2.74K
100K
11
R32
Q3
1
R34
10M
R35
2K
R36
NC 13
NO
+24V
3
2
8
1
+24V
4.75K
4
OFF
R39
4.75K
D8
6
3
R29
R20-7
COMPARATOR
1
POLARITY
SEPARATOR-1
D2
1
OFF
8
10K
100K
R11 D1
392
100K
100K
100K
R19
R9
1 R20-8
R20-5
R20-4
100K
ZERO-1
-15V
R17
CW 1M
R16
1K
R8
1K
150K
100K
3 A2
+
12
0.01µF DELAY-1
TIME-1
47.5K
CW R10
JMPR3
ON
R20-3
49.9
CW
P1
100K
+15V
R12
100K
6
100pF
R7
100K
R5
8
R13
R20-2
10µF
C2
GAIN-1
C1
100K
R4
6
R6
100K
C3
1M
SUMMER-1
R1
R25
+15V
18.2K
ON
2
R23
-15V
LED2
LED3
LO
HI
IN
CW
LED1
P4 100K
-15V
TPW1
3
2
Q2
1
D11
+15V
1N4003
WINDOW-2
LEVEL-2
C15
22µF
+24V
R72
-15V
24
R99
10K
3 +
2 A3
-
R52
-
5 A3
+
7
R65
100K
P6
10K
P5
1M
R66
1K
47.5K
R58
1K
ZERO-2
R59
100K
100K
100K
100K
R70-1
TP2
9
1 - A3
0 +
13
12
D18
-
14
A3
+
D17
CH2
P5
P6
P7
P8
R62
Function
Gain Adjust
Time Adjust (Integrator Time Delay)
Level Adjust
Window Adjust
Zero Adjust (Offset or D-C Bias)
CH1
JMPR1
JMPR2
JMPR3
Relay Latch/Reset Operation
Output Transistor Open Collector Mode
Up/Down Integrator Time Delay
CH2
JMPR4
JMPR5
JMPR6
Relay Latch/Reset Operation
Output Transistor Open Collector Mode
Up/Down Integrator Time Delay
6
D19
R71
27.4K
-
A4
+
9
10 A4
+
POLARITY
SEPARATOR-2
100K
D22
13
R76
49.9
14
-
R83
R80
357
10M
R78
2K
D23
4.75K
2
100K
68.1
D24
6
8 NO 11
25
19
1
23
R82
+24V
+24V
D25
R81
R91
2.74K 4.75K
D27
+24V
1N4003
LED5
LED6
LO
HI
1N4003
NOTES:
1. ■ – PIN 1 (SQUARE PAD ON PCB).
2. A1,A2,A3,A4 ARE TL084.
3. Q1, Q2, Q3, Q5, Q6, Q7 ARE 2N2222A.
4. UNLESS OTHERWISE SPECIFIED, ALL DIODES ARE IN4148.
Resistor Pack
R20/R70
Pins Used
-1
1 & 16
-2
2 & 15
-3
3 & 14
-4
4 & 13
-5
5 & 12
-6
6 & 11
-7
7 & 10
-8
8&9
9 NO
OFF
1N4003
2.74K
3
2 Q6
1
D26
+15V
An ‘Extender Card’ is highly recommended to gain access to ‘Test Points’ and ‘Adjustments’ while cards are powered-up within a Eurocard Rack Assembly.
(Moog ref P/N A81750-1)
Q7
1
R90
2.74K
R84
R85
2K
R86
Q5
3
10M
R87
ON
NC 13
4
+24V
4.75K
1K
27
JMPR5
3
2
R89
4.75K
R88
21
NC
RL2
1
R77
17
RELAY-2
16
D21
R79
100K
8
15
OFF
D20
7 R70-7
COMPARATOR
2
8
R70-6
1 R70-8
12 A4
+
5
100K
R68
1K
ADJUSTMENTS
CH1
P1
P2
P3
P4
R12
R70-5
10K
100K
R61
392 D16
A4
+
3
R70-4
R69
CW R60
150K
CW
2
R70-3
DELAY-2
TIME-2
ON
R70-2
100K
0.01µF
R67
JMPR4
0
100K
OFF
49.9
+24V
R74
R75
10µF
C9
CW
C8
100K
-15V
10K
100pF
R57
100K
R55
+15V
R62
100K
49.9
6
TPW2
GAIN-2
100K
R54
18
R63
CW
JMPR6
ON
C10
1M
R56
1
100K
R53
16
R73
+15V
18.2K
UP / DOWN
INTEGRATOR-2
R64
SUMMER-2
R51
14
CW
-15V
0
12
P7 100K
18.2K
TPL2
C16
22µF
22
30
-15V
1N4003
IN
0
20
P8 100K
+15V
LED4
R98
28
BASIC OPERATION DESCRIPTION/FUNCTIONAL DESCRIPTION
The Electronic Card Is designed to provide a variable “window” width detection circuit on each of two channels. Front Panel controls and Test Points
provide “independent” setting of level and window width. Comparator status is indicated by front panel LED’s.The output transistor may be used in an
optional “open” collector mode, and the relay may be configured for latch/reset operation, which has adjustable Gain and Zero (Bias) span.The “summed”
signal feeds an up/down integrator that provides a variable time delay.This is used to eliminate the effects of transient over signal conditions.The
comparator can also be configured as a single detection circuit.
The Comparator is essentially an Analog circuit that monitors two input voltages. One voltage is called the Reference Voltage (VREF) and the other is
called the Input Voltage (VIN).When VIN “rises” above or “falls” below VREF, the output of the Comparator changes states.
As an example, Channel-1 may be used to monitor voltage for one specific appIication such as error voltage monitoring while Channel-2 may be used
to monitor a regulated power supply output. In either case, the Comparator provides the user with independent options from the same card.
FRONT PANEL INDICATORS
INITIAL CUSTOMER INSTALLATION & SET-UP
• There are “Six” light emitting diodes (LED’s) visible on the front panel
which indicate Comparator Status for various on/off switching modes
Power OFF checks:
l)
• Channel-1 and Channel-2 each have “Three” status indicator lights
including the following:
Channel-1:
Channel-2:
HI LED
LO LED
IN LED
LED3
LED2
LED1
RED
RED
GREEN
HI LED
LO LED
IN LED
LED6
LED5
LED4
RED
RED
GREEN
2)
3)
4)
5)
6)
SIGNAL FLOW DIAGRAM
7)
+24v
JMPR1
UP/DOWN
INTEGRATOR
GAIN - 1
WINDOW - 1
-15v
JMPR3
+V
0v
9)
Q1
Vin
COMP.
SECT.
Power ON checks:
0v
+ 15v
- 15v
- 15v
LEVEL - 1
zero - 1
Vo
RELAY
LATCH
TIME
DELAY
TIME-1
R
+ 15v
JMPR2
SIG
GND
C
SUM AMP
8)
RL1
Observe all standard anti-static precautions as specified In MIL-STD1686 Electrostatic Discharge documentation.
Carefully remove the Electronic Assembly (Comparator Card) from
protective carrier at an approved static protected work station or
site.A “grounded” table mat and “wrist” strap is highly
recommended.
Before applying power, make a detailed visual inspection of
Comparator Circuit Card.
Check Card for any damage or broken connections.
Check Assembly for any loose wiring, pinched wires or loose
mechanical connections.
Verify all “six” jumpers are installed on Card. Ensure jumpers are in
the proper position as specified in Adjustment Procedure Section.
With “wrist strap” connected, insert card into rack by sliding card
securely in rails of rack assembly. Ensure plug is firmly seated into
connector located on backplane of rack assembly.
Tighten upper & lower front panel mounting screws securely into
card rack.
Install jumper wire from Pin-22 (Sig Gnd) to Pin 24 (Pwr Gnd).
HI IN
LO
PWR
GND
0v
-10v
Vramp
T = RC
Figure 1: Channel-1: Signal Flow Diagram
• H1 LED INDICATOR: If the monitoring voltage should exceed the set
upper limit, the HI “red” indicator light will illuminate to signify that
the input voltage is above the pre-set upper threshold.The LED will
go “off” when the voltage state falls to within the prescribed limits.
• LO LED INDICATOR: If the input voltage being monitored should
drop below the pre-set lower threshold voltage, the LO “red”
indicator light will illuminate.The LED will go “off” when the voltage
state rises to within the prescribed limits.
• IN LED INDICATOR: If the input voltage being monitored operates
within the pre-set lower & upper threshold voltage range, the IN
“green” indicator light will remain “on”.This is the ‘NORMAL’
operating condition.The LED will go “off” should the voltage
switching level “rise” above or “fall” below the prescribed limits.These
conditions will illuminate a “red” LED for either fault indication.
I)
Apply AC power to rack and verify all DC voltage power supply
voltages are present.
2) Verify +15 VDC at Pin-28 & -15 VDC at Pin-30. Measurement taken
with respect to Pin-22 (SIGNAL GROUND).
3) Verify +24 VDC at Pin-20. Measurement taken with respect to Pin-24
(POWER GROUND).
4) Apply +15 VDC to Pin-5 & -15 VDC to Pin-9. Monitor Relay contact
output voltage at Pin-7.
5) Apply an input voltage of ±3.0 VDC to Pin-2.Vary the input range.
a. Verify when Pin-2 ≥ +2.1 VDC.The “HI LED” (Red) is
“illuminated” and Pin-7 is -15.0 VDC.
b. Verify when Pin-2 ≤ -2.1 VDC.The “LO LED” (Red) is
”illuminated” and Pin-7 is -15.0 VDC.
c. Verify when Pin-2 ≤ -1.9 VDC and ≥ +1.9 VDC.The
“IN LED” (Green) is “illuminated” & Pin-7 is +15.0 VDC.
CUSTOMER ADJUSTMENT PROCEDURES: CHANNEL-1
Initial Set-up:
l)
Set JMPR1 and JMPR2 to “ON” position.
2) Set JMPR3 to “OFF” position
Level and Window Comparator Setup:
l)
Determine the desired Input Voltage Range to to be monitored.The
Comparator MAX WINDOW range available is ±10.0 VDC.
2) Apply +1.00±0.05 VDC to Pin-2 (Input Monitoring Pin).
3) Adjust P1 (Gain-1) for -1.00±0.01 VDC at TP1.
4) Adjust P3 (Level-1) and P4 (Window-1) to set-up desired window
detection and voltage limits.
5) Selected setting examples include:
a. Monitoring Error Input Voltage: 0 to +10 VDC
• Description: This Set-up allows monitoring of an input error
voltage from 0 to +10 VDC.When d-c input voltage rises above
+10 VDC or falls below 0 VDC, the output changes state and
LED’s located on front panel will illuminate respectively.
Operation within the limits will also illuminate an LED on front
panel. Monitoring is performed on Channel-1.
• Adjust P3 (Level-1) for +5.00±0.01 VDC at TPL1
• Adjust P4 (Window-1) for 5.00±0.01 VDC at TPW1
• HI LED is illuminated when Pin-2 ≥ +10.1 VDC
• LO LED is illuminated when Pin-2 ≤ -0.05 VDC
• IN LED is illuminated when Pin-2 range is between +0.1 VDC
and +9.9 VDC
Window Range
0 to +10 VDC
+10
+5
P3 Adj. (Level-1)
VDC
0
-5
t
P4 Adj. (Window-1)
Figure 2 – Monitoring Error Input Voltage
b. Monitoring Power Supply Voltage: +5.0±0.5 VDC
• Description: This Set-up allows monitoring of regulated power
supply voltage within prescribed specification limits.When d-c
voltage rises above +5.5 VDC max limit or falls below 4.5 VDC
min limit, the output changes state and LED’s will illuminate.
• Adjust P3 (Level-1) for +5.10±0.01 VDC at TPL1
• Adjust P4 (Window-1) for -0.50±0.01 VDC at TPW1
• HI LED is illuminated when Pin-2 ≥ +5.6 VDC
• LO LED is illuminated when Pin-2 ≤ +4.4 VDC
• IN LED is illuminated when Pin-2 range is between +4.5 VDC
and +5.5 VDC
+5.0±0.5 VDC
+5.5
+5
+4.5
VDC
P3 Adj. (Level-1)
t
0
-0.5
P4 Adj. (Window-1)
Figure 3 – Monitoring Power Supply Voltage
c.Window DC Voltage Level Detector: ±2.0 VDC
• Description: This Set-up allows monitoring of on/off switching
output modes that are tripped at settable levels of d-c input
(+ & -). LED’s on front panel are illuminated for visual indication
of switching states.Typical applications include set-polnt detection
and null-detection. Monitoring is performed on Channel-1.
•
•
•
•
•
Adjust P3 (Level-1) for 0.00±0.01 VDC at TPL1
Adjust P4 (Window-1) for -2.00±0.01 VDC at TPW1
HI LED is illuminated when Pin-2 ≥ +2.1 VDC
LO LED is illuminated when Pin-2 ≤ -2.1 VDC
IN LED is illuminated when Pin-2 range is between -1.9 VDC
and +1.9 VDC
• VUT is the Upper-Threshold Voltage
• VLT is the Lower-Threshold Voltage
HI LED
± 2.00 VDC Range
Window
(VUT) +2.0
0
VDC
t
(VLT) -2.0
LO LED
IN LED
Figure 4 – Monitoring Window DC Voltage Level
TIME DELAY OPERATION & SET-UP PROCEDURES:
CHANNEL-1
Operation:
1) Set jumper “JMPR3” to “ON” position
2) Ensure jumper wire is installed across Pin-22 & Pin-24
3) Ground Pin-2 to Pin-22 (Signal Gnd)
4) Ensure P2 is set Fully CCW
5) Apply +10.0±0.1 VDC to Pin-2
6) Verify voltage at TP1 is -10.0±0.5 VDC.Adjust P1 (Gain-1) if necessary
to obtain desired voltage level.
7) Apply Oscilloscope to TP1.Vary input from 0 to +10 VDC to observe
on/off switching states. Measure the “fall-time” of the negative voltage
ramp as the change in states occur.
8) Verify the “fall-time” of the negative voltage ramp for the transition of
switching level states is 90±20 mSec. (See Figure 5 below)
0V ref
VRAMP
-10 VDC (-VSAT)
Figure 5
Fall-Time (T=RxC)
9) Set P2 Fully CW
10) Repeat steps (5) thru (7)
11) Verify the “fall-time” of the negative voltage ramp for the transition of
switching level states is 900±200 mSec
Set-up Procedures:
1) Determine required Time Delay needed for specific application.
2) Verify thru calculation.
3) Refer to chart below for Time-Delay Setting Guide:
Vin
Vo @ TP1
Gain (P1)
P2
C
JMPR3
Time-Delay
+10
+10
+10
+10
-10
-10
-10
-10
1
1
10
10
CCW
CW
CCW
CW
10MF
10MF
10MF
10MF
ON
ON
ON
ON
0.09 Sec
0.90 Sec
0.90 Sec
9.00 Sec
TROUBLESHOOTING GUIDE
General Troubleshooting
• Check interconnect wiring discontinuity caused by broken wires or
loose connections
• Check circuit grounding within the interconnections or the power
wiring interface
• DO NOT make electrical adjustments before checking all wiring
connections, jumper locations and test point voltages
• Check power supply to ensure all voltages are present
• Monitor all Test Point positions and indicator lights before proceeding
with troubleshooting checks
• Check if jumper wire is installed across signal ground and power
ground
• Ensure all Power is OFF before removing or installing the
Comparator Card
Symptom and Cause
• Comparator Card will NOT operate
- AC Power to rack is not ON
- DC power supply is not functional
- Card plug is not fully engaged into backplane connector
- Regulated ±15VDC Supply voltage is present but not
Unregulated +24VDC supply to LED’s and relay
• Both HI and LO LED’s are illuminated
- Jumper wire is loose or not installed across Pin-22 (Sig Gnd)
and Pin-24 (Pwr Gnd)
- Defective Potentiometer settings
- Incorrect Power Supply hook-up to card
- Incorrect Power Supply voltages exist
• Relay Contacts will not change on/off switching states
- Defective Relay component
- Incorrect jumper settings in output transistor section;
- Set Jumpers JMPR1, JMPR2, JMPR4 & JMPR5 to ON
- Defective output transistor (Q1 or Q2); monitor collector
voltage
- Unregulated +24VDC supply is not ON
• One or more of the LED Indicator lights will Not function
- Defective LED component
- Shorted Diode
- Unregulated +24VDC Power Supply is not present
• Potentiometer adjustments on Channel-1 effect LED operation on
BOTH channels
- Jumper wire is loose or not connected across signal & power
ground
- Only one ground is connected
• Only the H1 LED or LO LED will operate
- incorrect Level & Window Potentiometer settings
- Shorted Diode in Relay Latching Stage
- Power to LED is not present
• Unable to monitor desired input voltage range; HI & LO LED’s will
not trigger on; Only IN LED (Green) will illuminate
- Input voltage range exceeds Maximum Window Span of ±10VDC
- Wlndow is limited to the saturation voltage of dc supply
- Signal Ground & Power Ground are not connected
- Power Supply Voltages are not present at LED’s
• HI and LO LED’s will not trigger-on at prescribed voltage limits
- incorrect Window or Level Pot Settings
- Adjustments performed on incorrect Channel Selection
- Built-in Hysteresis of approximately 50mV not taken into
consideration when setting up Window Limits
• Unable to set-up input voltage monitoring Window or Level
- Incorrect Window or Level Pot Settings
- Incorrect Adjustment procedure performed; Review Customer
Set-Up procedures
- Adjustments performed on incorrect Channel Selection
• Unable to set-up Time Delay function
- Set jumpers JMPR3 & JMPR4 to ON position for Channel-1 &
Channel-2 respectively
- Time delay exceeds 0 to 10 Sec range; higher range may be
achieved by component substitution
- Defective “TIME-1 or 2” Potentiometer
- GAIN Pot not property adjusted
• False voltage level transitions occur along with improper LED
indications
- Signal and Power Grounds ate not connected
- Noisy input signals
- Hysteresis too low; adjust Bias Pot (Zero)
• Excessive Output Voltage Errors and Noise occuring
- Incorrect DC Bias Pot Adjustment
- ZERO Pot not adjusted properly for 0VDC at TP1
- Input Offset-Voltage driving output into Saturation
• Output Voltage resulting in Oscillation
- Excessive input voltage Noise present resulting in Oscillation
- Compensation Capacitor (10-1000pf) needed across current
limit resistor to prevent Oscillation
- The GAIN Adjust Pot set too High
Schematic Diagram
• NE123-212: Dual Channel Comparator/DC Level Detector
• Ref. Schematic No. G1270
GENERAL WARRANTY & SAFETY
WARRANTY CAUTION:
Disassembly, maintenance or repair other than in accordance with
the instructions herein or other specific written directions from
Moog Industrial Controls will invalidate MIC’s obligation under its
warranty. Refer to Moog Industrial Controls warranty for complete
provisions thereof.
SET-UP ADJUSTMENT CAUTION:
The Comparator Card has been completely tested and adjusted
including setting of the jumper positions prior to shipment from
Moog-ICD. Further adjustments may be needed to achieve desired
application specification requirements. Potentiometer adjustments
have been provided for both Channel-1 & 2 including Gain,TimeDelay, Level Setting,Window Span and DC Bias.
All jumpers have been pre-set to the ON position except for the
Time-Delay Mode which is initially set to the OFF position. If
adjustments ate required such as for setting up the Window or Level
voltage range, refer to specific set-up and adjustment procedure
instructions within this manual.
TROUBLESHOOTING NOTICE:
If a fault develops in the Comparator Card operation which was
operating correctly, DO NOT make any further adjustments.The
problem must be properly diagnosed by observing the LED indicator
lights, checking test set-up voltages and using the troubleshooting
guide as described in this manual.
DO NOT attempt to replace components or parts on the PC
Circuit Board.This could cause further problems and void warranty.
WARNING!!
Use only recommended test instruments (DVM, Oscilloscope), or
equivalents, when performing any diagnosis or set-up of the
Comparator Card. Failure to observe this warning may result in
Electronic Comparator Card damage or interfacing system modules.
Refer to Set-up instruction and Adjustment Procedure sections for
proper installation and operation/set-up of card.
Industrial Controls Division
Moog Inc., East Aurora, NY 14052-0018
Telephone: 716/655-3000
Fax: 716/655-1803
Toll Free: 1-800-272-MOOG
CDL6185 Rev C 500-202 898