frako PQC - Page 74

74 | Troubleshooting
Power Quality Controller – PQC | Operating Manual | FRAKO
Alarm
message
Fault Possible cause Remedial action
Overcurrent
> set limit
Voltage harmonics in
network too high
Triggered when ratio I
rms
/
I
50Hz,60Hz
exceeds alarm
limit.
Switching
cycles > set
limit
Number of switching
cycles of one or more
contactors exceeds set
maximum
Replace the contactors
concerned and clear
their switching cycle
counters.
V Harm. >
set limit
Voltage harmonics in
network too high
Zero stage
detected
The PQC has detected
one of more stages
whose nominal power
has fallen.
Capacitor stage(s) has/
have lost capacitance.
Replace capacitor(s)
Because of an unstable
network, the PQC has
mistakenly detected a
loss of capacitance.
Deactivate the zero
stage detection function.
Voltage
blackout
(sag)
The PQC has detected
one of more stages
whose nominal power
has fallen.
Capacitor stage(s) has/
have lost capacitance.
Replace capacitor(s)
Because of an unstable
network, the PQC has
mistakenly detected a
loss of capacitance.
Deactivate the zero
stage detection function.
Connection
not detected
Stages not
detected
Short-time voltage black-
out (voltage sag)
Triggered if a voltage sag
causes the RMS voltage
to fall below the set limit
within the duration of a
half-wave