Manual Power Quality Filter PQFS Electrical design and installation 67
WARNING: If a function is assigned to a digital input, the same function must never be
assigned to the other digital input. Otherwise the filter may behave erratically.
Table 29: Filter behavior as a function of the PQF-Manager settings for
main/auxiliary switching
digital input
input
Vhigh applied to digital input
Activ. Main
Auxiliary settings are
used
Main settings are used
Auxiliary settings are used
Remark: Vlow = 0 Vdc, Vhigh = 15-24 Vdc
In order to obtain full redundancy with filters consisting of more than one master unit,
the digital inputs of all the units in a multi-master arrangement have to be set up and
cabled in the same way and the individual PQF-Managers have to be set up accordingly.
Once the cabling has been finished:
− The auxiliary fuse box may be closed
− The filter top cover may be replaced including the connection of the PQF-Manager
to the master unit
− The power to the filter may be restored
Refer to Section 7.9.1.4 for guidelines on how to set up the digital inputs according to
the function required.
6.12.6 Implementation of local start/stop buttons
WARNING: If a function is assigned to a digital input, the same function must never be
assigned to the other digital input. Otherwise the filter may behave erratically.
The PQFS active filter is equipped with a start/stop function integrated in the PQF-
Manager user interface. If the customer desires this however, he can add extra
start/stop buttons (not provided) to the filter system. The start and stop button has to
be connected to the PQF-Manager’s digital inputs and the PQF-Manager has to be set
up accordingly.
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