Electrical Diagram; Connection Of Several Banks In Parallel (Master Units Or Master Unit + Slave Unit Configuration); Figure 3.2. Electrical Diagram - ABB APC Series Installation, Operation And Maintenance Instructions

3.4.1.

Electrical diagram

Regarding the standard wiring of the ABB controllers, the voltage reference for the controllers is taken from
L2 and L3 phases and the current transformer is sited on the L1 phase.
If the current transformer is sited on another phase, it's useless to modify the voltage and current
connections since the APC bank is provided with an ABB controller with automatic adaptation to network
phase-rotation and CT terminals.
Master units are fitted with a power release contact which allows to remotely switch on and off the whole
APC bank. Before installing this feature, disconnect the whole APC bank from the power supply. In the
master unit, remove the connection wire (jumper) situated next to the gray CT jumper (see
order to switch off the power supply phase L2 of the PF controller. Connect the cable for remote control in
place of the considered jumper. Only when the contact is closed the PF controller is fed and the bank is
switched on.
WARNING: hazard of electrical shock: be sure that the APC isolating switchgear is open before
every manipulation. All units (master and slave) must be disconnected.
3.4.2. Connection of several banks in parallel (master units or master unit + slave unit
configuration)
Several banks can be connected in parallel. Each bank may consist of a single master unit or a master unit +
slave unit configuration. Please note that to obtain higher ratings (kvar) we recommend a master unit + slave
unit configuration.
APC - Chapter 3. Installation

Figure 3.2. Electrical diagram

Figure 3.6.) in
13