ABB PQFS Installation, Operation And Maintenance Instructions page 151

· Stop (open the main contactor) and await user intervention. In this condition the
alarm contact of the PQF-Manager will switch on after a programmable delay and
the 'Armed' indicator will be OFF. The user has to acknowledge the fault (with the
PQF-Manager, via Modbus or via remote control) before the filter can be
restarted.
By default, the 'Armed' indicator is associated with the fourth digital output
contact (cf. Table 9
the PQF-Manager display (Cf.
of the digital output. Alternatively, the digital output considered can be wired to
monitor the 'Armed' indicator by distance (cf.
· Stop (open the main contactor) and restart automatically if the fault disappears.
In this condition the alarm contact of the PQF-Manager will switch on after a
programmable delay and the 'Armed' indicator will be ON. If it takes a long time
before the fault disappears, the user may decide to give a filter stop command.
This is done by highlighting the 'PQF ACK. FAULT' item in the 'Welcome' menu
and selecting
· Stop briefly without opening the main 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 main contactor opening command.
If the filter is OFF and a critical error occurs (e.g. network undervoltage), the errors will
also be 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.
When pressing 'ACK. FAULT' the filter will display a message relevant to the problem. It
also shows a list of the most recent critical faults that have been recorded.
Remark: 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.
Figure 90 shows the error treatment procedure in flowchart format.
and Table 10) The digital output contact monitor at the top of
Figure 60
. After this, the 'Armed' indicator will be OFF.
Manual Power Quality Filter PQFS ç Troubleshooting guide 151
item 3) can be used to check the status
Section 6.12.4)