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Effective 10/2004
Page 46
I.L. 70C1036H05
Symptom
Probable Cause
Possible Solution(s)
Comments
SETTINGS
ERROR
ALARM
Set point mismatch
between CHip A and CHip
B Microcomputers
Enter Program Settings by using the Esc
Button (do not use Reset Button) and SAVE
CURRENT curve. If setpoint download is
successful press Reset. Re-verify settings that
you desire.
If alarm reappears after trying the possible solution,
replace trip unit at first opportunity.
Ref. Fig. 3.1
SETTINGS ERROR
ALARM – or –
GROUND FAULT
PICKUP TEST
INCORRECT
Source Ground
configuration jumper
disconnected when circuit
breaker removed from cell
1. Make temporary secondary connector
jumper B-6 to B-7 to duplicate actual field
application – or –
2. Place circuit breaker back into test
position.
If ground test is to be conducted, apply ground test
current into external sensor’s primary conductor with
secondary leads B-4, B-5 connected to circuit
breaker.
WATCHDOG
ALARM
Low line Voltage
Communication Problem
Between CHip A and CHip
B Microcomputers
Check input voltage for Aux Power A14, A15
1. Push Reset Button
2. Replace unit if WATCHDOG alarm
reappears or if status LED is not flashing.
See Appendix G and H.
If alarm persists, protection (CHip A) function may
still be present if STATUS LED is flashing. However,
its values cannot be communicated properly to the
Display.
Ref. Fig. 3.1 and Section 3.2.1
CIRCUIT BREAKER
DOES NOT
COMMUNICATE WITH
PowerNet, BIM
II
Digitrip 1150 Firmware
version 8B must be REV
02 or greater for 1150
mode communication
1. Check for Aux. Power A14, A15.
2. Check address and baud settings.
3. Check status LED and Transmit LED.
4. Check
communication
wiring
B1,
B2.
5. Termination
resistor
missing.
See Appendix G
See Section 4.2.3
See Fig. 4.9.
CIRCUIT BREAKER
DOES NOT
COMMUNICATE WITH
AEM
II
For communication with
AEM
II
use Digitrip 1150
in the 910 mode.
Same as above.
See Appendix G
See Section 4.2.3
Note OK for Ver 6 and Lower
NO VOLTAGE
READINGS IN METER
MENU
PT dielectric plug removed 1. Circuit breaker is backfed and open.
2. Digitrip is not properly connected/inserted
to circuit breaker I1 connector
3. Replace
PT
Module.
Ref. Section 3.5.
Ref. Fig 1.2
VOLTAGE OR
CURRENT OR
FREQUENCY
READINGS APPEAR
WRONG OR
VARYING (Digitrip Cat
11xxx pre-2003
versions only)
Digitrip METER needs
both phase voltages and
at least 20% phase A
current available initially to
lock in frequency
Apply both line voltage and 20% phase A
current one time to setup metering.
This situation may occur on initial startup on 50 Hertz
applications since circuit breakers are typically tested
in the factory at 60 Hz.
Check (Message on
Aux. Display)
Switch
The MCR Aux. Switch 52b
is not operating or is not
wired properly
1. Check switch continuity on connector K2-
1, K2-2.
2. If secondary injection testing is being
done, close circuit breaker and retest.
Refer to Appendix C
RAM
ALARM
Memory Error
1. Push Reset Button
2. Replace unit if alarm reappears
Replace Trip Unit at first opportunity.
Appendix B Troubleshooting Guide Continued