IQ DP-4000
SECTION 6 - TROUBLESHOOTING AND MAINTENANCE
TD1 7548A
Symptom
Probable Cause(s)
Solution
All Operator Panel LEDs are off.
Digit
1
flashes in the display window.
Digit
2
flashes in the display window.
Digit
3
flashes in the display window.
Digit 4 flashes in the display window.
Digit
5
flashes in the display window.
Digit 6 flashes in the display window.
Digit 7 flashes in the display window.
Digit
8
flashes in the display window.
One or more voltage phases read
incorrectly
AC line being monitored is below 96 VAC.
Locate the cause of the deficiency in the
monitored AC line.
Separate Source AC line voltage is
deficient.
AC line fuses are blown, missing, or not
contacting correctly.
10
DP-4000 is malfunctioning.
A trip condition has been externally
initiated through the Communications
Port.
An overvoltage condition is detected.
An undervoltage condition is detected.
A phase unbalance condition is detected.
Locate the cause of the deficiency in the
AC control power line.
Verify that the incoming AC line is at the
correct voltage level. Check that the
fuses are sitting correctly in their clips.
Replace the unit.
Determine why the trip was initiated from
the
external
device
through
the
Communications Port.
Isolate the cause in the line.
Isolate the cause in the line.
Isolate the cause in the line.
A voltage phase loss condition is Isolate the cause in the line.
detected.
Blown or loose fuse(s).
Check fuse(s) on affected phase(s).
Reseat the fuse(s). Replace the fuse(s) if
necessary.
A current phase loss condition is Isolate the cause of the AC current phase
detected.
loss.
The
10
DP-4000 is detecting a phase Isolate the cause of the AC line phase
reversal.
reversal.
The
10
DP-4000 is detecting an internal Replace the unit.
malfunction.
Blown or loose fuse(s).
Check fuse(s) on affected phase(s).
Incorrect PT ratio.
Reseat the fuse(s). Replace the fuse(s) if
necessary.
Check PT ratio.
Current readings are not accurate or read
I ncorrect size CTs used.
zero.
Replace with proper size CTs.
Power readings are incorrect.
I ncorrect CT ratio.
Phasing for voltage and current is
incorrect.
Table
6. 8
Operational Troubleshooting
Check CT ratio.
Check phasing. Verify connections with
wiring diagrams.
41
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