IQ DP-4000
SECTION 6 - TROUBLESHOOTING AND MAINTENANCE TD 17548B
41
Symptom Probable Cause(s) Solution
All Operator Panel LEDs are off. 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.
Locate the cause of the deficiency in the
AC control power line.
AC line fuses are blown, missing, or not
contacting correctly.
Verify that the incoming AC line is at the
correct voltage level. Check that the fuses
are sitting correctly in their clips.
IQ DP-4000 is malfunctioning. Replace the unit.
Digit 1 flashes in the display window. A trip condition has been externally
initiated through the Communications
Port.
Determine why the trip was initiated from
the external device through the
Communications Port.
Digit 2 flashes in the display window. An overvoltage condition is detected. Isolate the cause in the line.
Digit 3 flashes in the display window. An undervoltage condition is detected. Isolate the cause in the line.
Digit 4 flashes in the display window. A phase unbalance condition is detected. Isolate the cause in the line.
Digit 5 flashes in the display window. A voltage phase loss condition is
detected.
Isolate the cause in the line.
Blown or loose fuse(s). Check fuse(s) on affected phase(s).
Reseat the fuse(s). Replace the fuse(s) if
necessary.
Digit 6 flashes in the display window. A current phase loss condition is
detected.
Isolate the cause of the AC current phase
loss.
Digit 7 flashes in the display window. The IQ DP-4000 is detecting a phase
reversal.
Isolate the cause of the AC line phase
reversal.
Digit 8 flashes in the display window. The IQ DP-4000 is detecting an internal
malfunction.
Replace the unit.
One or more voltage phases read
incorrectly
Blown or loose fuse(s). Check fuse(s) on affected phase(s).
Reseat the fuse(s). Replace the fuse(s) if
necessary.
Incorrect PT ratio. Check PT ratio.
Current readings are not accurate or read
zero.
Incorrect size CTs used. Replace with proper size CTs.
Incorrect CT ratio. Check CT ratio.
Power readings are incorrect. Phasing for voltage and current is
incorrect.
Check phasing. Verify connections with
wiring diagrams.
Table 6.B Operational Troubleshooting