Cabling Of Main/Auxiliary Control Functionality - ABB PQFS Installation, Operation And Maintenance Instructions

For cabling the digital output contacts to monitor other filter operation, the same approach
as shown in
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 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.
switching between the main and auxiliary settings. Moreover, both normal and inverse
logic can be used to drive the digital inputs.
Note that in a multi-unit filter system in which more than one master system is present,
the digital inputs of all masters have to be set up and cabled in the same way to obtain
full redundancy.
The electrical requirements of the digital inputs are as discussed in
Figure 55
functionality on Digital Input 2. It is assumed that normal control logic is used.
24 Vdc
external
supply
Remark:
(a)
Left hand terminal block when looking from rear, counting from top to bottom
Figure 55: Example of how to cable the 2
When implementing the function described above, please note that according to the
setup done with the PQF-Manager for the input considered, the filter may behave
differently.
64 Electrical design and installation ç Manual Power Quality Filter PQFS
Figure 53 can be adopted. The electrical characteristics of the digital output
Figure 48). Any digital input can be configured to act as the deciding factor for
gives an example of how to implement the main/auxiliary control switching
- +
External switch for
switching between main
and auxiliary filter settings
Table 27 shows the filter behavior as a function of the PQF-Manager settings.
Figure 54
11
12
nd
digital input of the PQF-Manager for main/auxiliary
control switching functionality
Section 6.12.2.
can be used to implement the
Chapter 12.
PQF-Manager
(a)
Digital input 2
(15-24Vdc)
(a)