ABB PQFS Installation, Operation And Maintenance Instructions page 139

All faults that occur are stored in the same event log. A fault can either be non-critical or
critical.
· A non-critical fault is a transient fault (e.g. a voltage spike). When a non-critical
fault occurs the filter may stop the switching of the IGBTs momentarily (< 40 ms)
but they will automatically restart. The only way to pick up this type of fault is to
analyze the event log. Given the transient/random character of this type of fault,
the filter performance will hardly deteriorate when it occurs.
· A critical fault is a fault that after occurrence cannot be successfully automatically
cleared by the system within a reasonable time. The time frame considered
depends on the error type. If the fault is considered critical by the system, the
label 'Critical' will be shown in the event logging window. In addition, the PQF-
item in the PQF-Manager 'Welcome' screen will show the label 'ACK. FAULT'.
Note however that if the fault disappears fast, this label disappears too.
Depending on the type of critical fault and the number of occurrences, the filter,
when running, may either:
Stop (open the main contactor) and await user intervention. In this
o
condition the alarm contact of the PQF-Manager will switch on after a
programmable delay and the 'Armed' indicator will be OFF. The green
LED on the main controller board (Cf.
off and the red LED on (Cf.
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.
monitor at the top of the PQF-Manager display (Cf.
can be used to check the status 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
o
disappears. If stopped, the alarm contact of the PQF-Manager will
switch on after a programmable delay and the 'Armed' indicator will be
ON. The green LED on the main controller board (Cf.
LED 2) will be ON and the red LED will be OFF (Cf.
LED 3). 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
this, the 'Armed' indicator will be OFF. The green and red LED on the
main controller board (Cf.
too.
Stop briefly without opening the main contactor and continue filtering
o
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 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.
Table 12
Table 12 item 18, LED 3). The user has to
Table 9 and Table
Section 6.12.4).
Table 12 item 18, LEDs 2 and 3) will be OFF
Manual Power Quality Filter PQFS ç Operating instructions 139
item 18, LED 2) will be
10) The digital output contact
Figure 60
Table 12 item 18,
Table 12 item 18,
item 3)
. After