Manual Power Quality Filter PQFS
Operating instructions 175
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Stop briefly without opening the contactor and continue filtering when the
error has disappeared. This is essentially the same case as the one described
above but the error phenomenon disappears faster than the time required
to generate a contactor opening command.
If the filter is OFF and an external critical error occurs, these errors are also
reported in the event log. As long as a critical fault condition exists (e.g.
permanent undervoltage on one phase) the display will show the message
‘ACK. FAULT’ and the filter will refuse to start; The ‘Armed’ indicator on the
PQF-Manager will be OFF and both the green and red main controller LEDs
will be OFF too.
In general the occurrence of transient faults is no problem for the proper
operation of the active filter. Only when an error becomes ‘critical’, a problem
may exist.
If ‘ACK. FAULT’ is present on the PQF-Manager display, look at the ‘Armed’ indicator (By
default mapped to the 4
th
digital output of the PQF-Manager) to know whether the filter
will restart automatically after clearance of the problem or not.
- ‘Armed’ indicator ON: The filter waits for the problem to disappear and then restarts
automatically (unless the user acknowledges the fault).
- ‘Armed’ indicator OFF: The filter is permanently stopped and the customer has to solve
the problem, acknowledge the fault and restart the filter manually.
If the filter is in remote control operation and the message ‘ACK. FAULT’ is present on
the PQF-Manager, the fault can be acknowledged by sending a ‘STOP’ command by
remote control (low signal). Alternatively, the remote control functionality can be
disabled by disabling the corresponding digital input functionality. Then, the fault can
be acknowledged locally.
Refer to
Chapter 11
