Digital Outputs - ABB PQFM Instruction Manual

- The external 24 V power supply fails OR
- Both filter units are disconnected from the supply.

6.12.2.2 Digital outputs

A second method to implement the alarm functionality is to use the PQF-Manager's
programmable digital output contacts. Use this approach when the condition for alarm
is uniquely defined, e.g. an alarm has to be given only when the filter trips due to an
unacceptably high network voltage or when the filter trips due to a well-defined internal
error. This type of alarm has to be cabled on the 8 pin terminal block situated at the top
right corner when looking at the PQF-Manager from the rear (Cf.
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.
Maximum continuous dc rating: 110 Vdc/0.3A.
-
The common is rated at 9 A/terminal, giving a total of 18 A.
-
- When using a power supply of 24Vdc, a minimum current of 10 mA should be
drawn by the circuit connected to the digital output contact.
Table 29 shows the status of a digital output contact configured as alarm contact for
different operation modes of the filter.
Table 29: Status of a digital output contact configured as alarm contact for different
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
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.
navigate to the digital output setup menu.
80 Electrical design and installation ç Manual Power Quality Filter PQFM
filter operation modes
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.
Table 10) Refer to Section 7.9.1.4
Figure 57).
Table 30.
for guidelines on how to
The