Manual Power Quality Filter PQFS Commissioning instructions 159
Figure 82: CT connection guidelines for the case that a passive filter is installed
downstream of the active filter
Further, when a passive filter and an active filter are installed on the same bus, it
is not recommended to select on the active filter the harmonics at or below the
tuning frequency of the passive filter. If these harmonics are selected, the SDP
function may stop filtering these harmonics temporarily resulting in a reduced
overall filtering performance.
− In installations where 2 non-compatible masters are connected to the same CT,
respect the following guidelines for best performance:
1. Select different harmonics on both units
2. If 1 above is not possible, put one filter in Mode 1 and the other filter in Mode 3
Note: ‘Non-compatible’’ master units are master units that cannot or are not
interconnected with the RJ45-communication cable.
Please do not forget to fill in the commissioning report for future reference.
8.11 Commissioning report
The commissioning report is designed to help the person in charge of the
commissioning.
Before installation and operation of the PQF, read the relevant sections of the
Instruction Manual.
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