I.B. 17555C
Effective November 1999
Page 39
TABLE 6.1 TROUBLESHOOTING GUIDE
Symptom Probable Cause Possible Solution(s) Reference
Operational LED is Off Protective Relay’s Control
Power is Deficient or Absent
Protective Relay is
Malfunctioning
Verify that Control Power is Connected
Between TB1 -5 and TB1 -6 and that it
is within Specifications
Replace the Protective Relay
Figure 3-1 and
Paragraph 2-3
Paragraph 6-3
Operational LED is On
but Does not Blink
Protective Relay’s Control
Power is Deficient or Absent
Protective Relay is
Malfunctioning
Verify that Control Power is Connected
Between TBI-5 and TBI-6 and it is
within Specifications
Replace the Protective Relay
Figure 3-1 and
Paragraph 2-3
Paragraph 6-3
Operational LED
Blinks Red or is any
Color other than a
Definite Red or Green
Internal Problem
Detected
Press Reset Pushbutton
Reprogram Setpoints
Replace Protective Relay if Symptom
Persists
Paragraph 2-2.1
and 3-2
Paragraph 3-3.2
Paragraph 6-3
“PGRM” Appears in
Settings Display Window
Setpoints are Invalid
Check sum did not Match
Reprogram Setpoints
Replace Protective Relay if “PGRM”
Reappears After Saving Settings
Paragraph 3-3.2
Paragraph 6-3
“ERR” Appears in Setting There was an Error During
Setpoint Programming
There was an Error While
in the Test Mode
Make Sure DIP switch S2 is in
Correct Position
More than 0.1 Per Unit of Current
Cannot Flow While in Test Mode
Table 5.1
Paragraph 3-3.3
“RAM” Appears in
Settings Display Window
An Internal RAM Check
Failed
Remove Power from the Protective
Relay and then Reapply Power - If the
Symptom Persists, Replace the
Protective Relay
Paragraph 6-3
Current Readings Appear
Incorrect
Incorrect CT Ratio used
in Equipment
Incorrect Current Wiring
Verify CT Ratio in Equipment
Verify Connections on CT Wiring
Paragraph 1-3
and Paragraph 3-3.2
Figure 3-1
Current Readings
Appear Incorrect
Incorrect System Frequency
Programmed
Breaker “b” Contact to trip
unit not functioning
Set to Correct Frequency
Insure “b” Contact Type is Connected
to Protective Relay and Functioning
Paragraph 3-3.2
Figure 3-1
Circuit Breaker Trips
Much Faster than
Expected on Inverse
Time Overcurrent
Incorrect Settings
Phase Zone Interlocking not
used and Jumper Missing
Ground Zone Interlocking not
Used and Jumper Missing
Zone Interlocking Used
Check Settings
Check for Phase Zone Interlocking
Jumper Between TB1 -13 and TB1 -14
Check for Ground Zone Interlocking
Jumper Between TB1 -11 and TB1 -12
Check for Absence of Blocking
Signal from “Down-Stream” Breaker
NOTE:
During an Internal Test, there is
No Blocking Signal from a
“DownStream” Breaker, there-
fore, add jumper for test.
Paragraph 3-3.2 and
Table 5.1
Figure 3-1
Figure 3-1
Paragraph 4-2
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