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Figure 54: Cabling of the alarm status of a multi-unit filter consisting of masters only, using the NO
60 Electrical design and installation ç Manual Power Quality Filter PQFS
PQF-Manager
(a)
9
NO
(a)
10
Alarm
outputs
11
NC
12
Remark:
(a)
Right hand terminal block when looking from rear, counting from top to bottom
Figure 53: Alarm cabling example using NO alarm contact and external digital input
When the filter system consists of multiple master-units and an alarm contact is
needed to signal when the complete system is off, then the NO alarm contacts of
all the master units have to be cabled in parallel. An example is given in
54
for 2 master filters.
+
24 Vdc
external
supply
Note: Contacts drawn in non-alarm position
In the
Figure 54
above, the external input will be low if:
Both master units are in alarm OR
o
The external 24 V power supply fails OR
o
Both filter units are disconnected from the supply
o
· A second method to implement 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. In that case the desired function can be assigned to a
programmable alarm which can be monitored be assigned to a digital output.
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.
NO Alarm
contact of
master 1
NO Alarm
contact of
master 2
-
alarm contact on each filter.
+
24 Vdc
external
supply
-
+
External
digital
input
-
Figure
External
digital
input
Figure
48)
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