Motor Control Unit [t-head1-pg]

Motor control unit RA-MO allows the direct bidirectional operation of three-phase motors. The rated current is adjustable from 0.3 to 6.6 A (0.09 to 3 kW).

Connections [t-head3]

Motor control unit RA-MO is supplied ready for installation. The connection to the AS-Interface® data bus and the motor is described below. The connection to the power bus is described in the earlier general section “Rapid Link system”.

The unit is connected to AS-Interface® through an M12 plug with the following PIN assignment:

M12 plug	PIN		Function
	1		ASi+
	2		–
	3		ASi–
	4		–

External sensors are connected through an M12 socket.

On the RA-MO the motor feeder features a plastic-encapsulated socket. The length of the motor cable is limited to 10 m.

The motor is connected through a halogen-free, 8 × 1.5 mm², unscreened, DESINA-conformant motor supply cable with a length of 2 m (SET-M3/2-HF) or 5 m (SET-M3/5-HF).

Alternatively you can assemble your own motor supply cable with plug SET-M3-A with 8 × 1,5 mm²

		SET-M3/...
1		1		U		–		–
•		–		–		–		–
3		3		W		–		–
4		5		–		–		B1 (/–)
5		6		–		T1		–
6		4		–		–		B2 (/+)
7		2		V		–		–
8		7		–		T2		–
PE		PE		PE		–		–

Motor connection without thermistor

:

If motors are connected without PTC thermistor (thermoclick), cables 6 and 7 must be linked at the motor; otherwise the RA-MO issues a fault message.

Motor connection with thermistor

:

Note

The two connections illustrated below apply only for motor control unit RA-MO.

Connecting a 400 V AC brake:

:

Connecting a 400 V AC brake with rapid braking:

For controlling braking motors, their manufacturers provide braking rectifiers, which are fitted in the motor terminal strip. If the DC circuit is opened at the same time, the voltage at the braking coil drops off much quicker, causing the motor to also brake more quickly.