Manual Power Quality Filter PQFM Electrical design and installation 83
Table 32: List of possible warning conditions that can be assigned to a digital output
Supply voltage (RMS) higher than preset value
MS) lower than preset value
Supply voltage imbalance higher than preset value
Ground current level higher than preset value
IGBT Temperature higher than preset value
Control board temperature higher than preset value
Remark: All warning levels can be changed by the user.
Any of the six digital outputs can be used to cable warning functionality. A maximum of
3 warnings can be assigned to the digital outputs. However, by default the digital
outputs of the PQF-Manager have been set up for monitoring other functions than
warnings (cf. Table 10) Refer toSection 7.9.1.4 for guidelines on how to set up warning
conditions and how to associate them with digital output contacts.
For cabling the digital output contacts as warning contact, the same approach as shown
in Figure 62 can be adopted. The electrical characteristics of the digital output contacts
and the points to pay attention to are discussed in Section 6.12.2.
In order to obtain full redundancy with filters consisting of more than one master unit,
the digital outputs of all the units in a multi-master arrangement have to be set up and
cabled in the same way. The wiring diagram given in Figure 63 can be used to implement
the monitoring of the warnings in multi-master units.
6.12.4 Cabling of the digital output contacts to monitor other filter operation
modes than warnings and alarms
Table 9 gives an overview of the other functions that can be monitored with the digital
outputs in addition to the already discussed warnings and alarms.
For cabling the digital output contacts to monitor other filter operation, the same
approach as shown in Figure 62 can be adopted. The electrical characteristics of the
digital output contacts and the points to pay attention to are discussed in Section 6.12.2.
In order to obtain full redundancy with filters consisting of more than one master unit,
the digital outputs of all the units in a multi-master arrangement have to be set up and
cabled in the same way. The wiring diagram given in Figure 63 can be used to implement
the monitoring of these functions in multi-master units.
6.12.5 Cabling of main/auxiliary control functionality
The active filter features main and auxiliary control setup modes. This implies that two
different compensation characteristics can be defined, e.g. one for the day and one for
the night or one for normal network operation and one for backup generator operation.
With the PQF-Manager a set up can be made to either use always the main or the auxiliary
settings. In addition, the possibility exists to switch between main and auxiliary settings
‘automatically’ according to a signal applied to a digital input of the PQF-Manager (Cf.
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