The Pqf-Manager User Interface - ABB PQFM Instruction Manual

Direct Interface
Modbus & PQ-Link interface
Programmable Digital I/O
CT signals
(a) CT signals to different units (master or slave) must be routed through daisy chain principle with
return path.
(b) If second unit is a slave unit, it will not have a PQF-Manager. If second unit is a master unit, it will
have a PQF-Manager.
When the filter consists of a master unit only, the customer has to:
- Wire the CT signals (on a designated terminal).
- Adapt the auxiliary transformer tap settings to the network voltage.
- Connect the AC power lines and earth connection.
- Set up the installation parameters and user's requirements with the PQF-
Manager.
He may also want to wire the communication interface (Modbus or Ethernet) and the
programmable digital I/O (e.g. alarm contact, remote control).
When a second unit is added, it is connected to the first enclosure by means of a CAN
bus communication link (1). In addition, the CT measurements have to be supplied to
each unit, i.e. through a daisy chain link with return path. Also, the earth points of the
different units have to be interconnected.
All slave units have their own AC-connection and main contactor protection.
A PQFM active filter system consists of up to 8 units. Additional units to the first master
unit may be master or slave units. Slave units do not have a PQF-Manager.

4.5 The PQF-Manager user interface

All user interaction with the filter is channeled through the PQF-Manager.
In multi-unit filters consisting of only one master, only the master has a PQF-Manager.
18 Hardware description ç Manual Power Quality Filter PQFM
User interface
PQF
Manager
(a)
PQF
Manager
(b)
Figure 7: Controller interface diagram of the PQFM active filter
CAN
PQF
Bus
main
controller
CAN bus (1)
CT's
PQF
main
controller
PQF
Power
First
Stage
unit
3~ AC Out
PQF
Power
Second
Stage
unit
3~ AC Out