Cabling Of The Digital Output Contacts To Monitor Other Filter Operation Modes Than Warnings And Alarms - ABB PQFS Installation, Operation And Maintenance Instructions

Note that the warning functionality is not associated with a filter trip. It only has a
monitoring function.
configured as warning contact for different filter operating modes.
Filter state
Disconnected from the supply
Filter (auxiliaries) connected to the
supply, no warning present
Filter (auxiliaries) connected to the
supply, predefined warning present
Filter (auxiliaries) connected to the
supply, predefined warning disappears
Table 26 gives a list of the warning conditions that can be assigned to a digital output.
Table 26: List of possible warning conditions that can be assigned to a digital output
Warning condition
Supply voltage (RMS) higher than preset value
Supply voltage (RMS) 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 to
how to associate them with digital output contacts.
For cabling the digital output contacts as warning contact, the same approach as shown
in Figure 53 can be adopted. The electrical characteristics of the digital output contacts
and the points to pay attention to are discussed in
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
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.
Table 25 describes the behavior of the digital output contact
Table 25: State of a digital output contact configured as
warning contact for different filter operation modes
Normally open digital contact state
Open
Open
Closes when warning present for predefined time
Otherwise, contact remains open
When closed before and warning disappears for at least
the predefined time, contact opens.
When closed before and warning disappears for a time
smaller than predefined time, contact remains closed.
Otherwise, contact remains open.
Section7.7.1.2 for guidelines on how to set up warning conditions and
Manual Power Quality Filter PQFS ç Electrical design and installation 63
Section 6.12.2.
Figure 54 can be used to implement the