54 Electrical design and installation
Manual Power Quality Filter PQFS
shows the way to interconnect the control boards.
Control board in the ‘previous’ unit
Control board in the ‘next’ unit
From previous unit (if present)
To next unit
(if present)
Figure 37: Control board interconnection cable connection method.
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The RJ45 control cable coming from the preceding filter unit is plugged in the left
hand side RJ45-socket at the top of the filter control board.
−
The RJ45 control cable leaving for the next filter unit is plugged in the right hand
side RJ45-socket at the top of the filter control board.
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Repeat the same procedure for any other filters to be connected.
Notes:
−
In the first unit of a filter system, the left hand RJ45-socket will always be empty.
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In the last unit of a filter system, the right hand RJ45-socket will always be empty.
−
During the commissioning phase, a unique address has to be assigned to each
unit in a filter system through dip switch (see
Chapter 8
).
6.11.3
CT cable interconnection
WARNING: Failure to connect the CT’s to all units in a filter system in an appropriate
way will result in filter malfunctioning and possibly sever damage of the unit.
In a multi-unit PQFS-system, all units have to be supplied with the CT-measurement
results. In order to do this the CT’s have to be cabled to each unit in a daisy chain fashion.
The connection principle is shown in
for the CT of phase which is fed to four
filter units. The same approach has to be implemented for the other phases too.
