Page 65 - 1SBC104119C0202_MainCatalog_R contactors

Slip-ring motor control with variable frequency drive
FOR contactors

Application
This variant is used to start a slip-ring motor which will be then controlled by a variable frequency drive.

(1) Stator contactor

(4) Rotor inverter contactor 5

M
3

(2) Starter coupling contactor

(3) Rotor short-circuit contactor

Rheostat

Description
A liquid rheostat is used to start and accelerate the motor after closing of the starter coupling contactor (2) and then the stator
contactor (1). When the nominal speed is reached, the rotor short-circuit contactor (3) closes.
Then the rotor inverter contactor closes (4) and the starter coupling contactor (2) opens.
The speed of the motor is controlled by the variable frequency drive.

FOR contactors are suitable for starter coupling (2), rotor short-circuiting (3) and rotor inverter (4) contactor.
IOR contactors must be used for stator contactor (1).

1SBC104042S0201

ABB R contactors | 5/13