ABB PQFS Installation, Operation And Maintenance Instructions page 61

The digital output contacts have a common point (cabled on contacts 1 and 2)
and are of the NO-type (normally open). The contact ratings are:
Maximum continuous ac rating: 440 Vac/1.5 A
o
Maximum continuous dc rating: 110 Vdc/0.3A
o
The common is rated at 9 A/terminal, giving a total of 18 A
o
When using a power supply of 24Vdc, a minimum current of 10 mA
o
should be drawn by the circuit connected to the digital output contact
Table 23 shows the status of a digital output contact configured as alarm contact
for different operation modes of the filter.
Table 23: Status of a digital output contact configured
as alarm contact for different filter operation modes
Filter state
Disconnected from the supply
Filter (auxiliaries) connected to the
supply, no error present
Filter (auxiliaries) connected to the
supply, predefined error appears
Filter (auxiliaries) connected to the
supply, predefined error disappears
The alarm conditions that can be assigned to a digital output are given in
24. The assignment must be made with the PQF-Manager. Any of the six digital
outputs can be used to cable an alarm. A maximum of 3 alarms can be assigned
to the digital outputs. Note however that by default the digital outputs have been
set up for monitoring other functions than alarms (cf.
7.7.1.2 for guidelines on how to navigate to the digital output setup menu.
Table 24: List of possible alarm conditions that may trigger the alarm/digital outputs
Alarm condition
Supply voltage (RMS) unacceptably
high
Supply voltage (RMS) unacceptably
low
One of the phases of the supply is
missing
Network imbalance unacceptably
high
Frequency variation unacceptably
high
PQFS DC bus voltage unacceptably
high
PQFS internal preload error
PQFS over current fault
PQFS IGBT fault
PQFS IGBT over temperature
Normally open digital contact state
Open
Open
Closes when error present for 3 minutes.
Otherwise, contact remains open.
When closed before, opens when error disappears.
When opened before, remains open.
Criteria to be fulfilled before contact is activated
Vrms_max > 110% Vnominal
Vrms_min < 90% Vnominal
Vrms_min < 60% Vnominal
Vimbalance > 2%
Frequency variation > 20%/s
Vdc > 105% Vdc_max_allowed for each capacitor
stack
DC capacitor voltage rise too low in preload phase or
the DC capacitors could not be preloaded in an
acceptable time.
Internal current higher than allowed
IGBT hardware reports internal permanent error
IGBT hardware reports internal over temperature
Manual Power Quality Filter PQFS ç Electrical design and installation 61
Table
Table 10) Refer to Section