Autoquip FREIGHTLIFT FL4M - Manual (Page 61)

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I. WIRING THE EURODRIVE BRAKE MOTOR
EURODRIVE gear motors are designed and manufactured with totally enclosed, fan-
cooled, squirrel-cage induction motors which are designed for operation under difficult
conditions. The windings are protected with a special insulating material Class B
equivalent or better. The brake motors incorporate a DC disc brake, and the supply is
taken from a half-wave rectifier mounted inside the motor terminal box and an SR relay
mounted on the motor terminal box which switches DC power on and off.
1. Voltage to the rectifier energizes the brake coil and releases the brake.
2. Removal of the voltage to the brake de-energizes the brake coil and allows the
brake to be applied.
3. The SR relay is to switch the DC voltage to brake coil shortening brake response
time.
4. The AC voltage to the brake will be rectified to a DC level of 50% of the AC voltage
applied.
5. For a standard 230/460-volt 3-phase motor, 230/460 volt single-phase must be
provided to the rectifier from the motor terminals.
The voltage to the brake must be applied and removed at the same time as the power
to the motor.
When the lift stops, three things must happen:
 Power must be removed from the motor.
 The AC line to the rectifier must be broken.
 A jumper line across two of the rectifier terminals must be broken.
NOTE: The brake action will be slow and inconsistent if these three
conditions are not met.
Remember, rotation of a 3-phase motor may be reversed by reversing the connections
of any two motor electrical leads.
INSTALLATION INSTRUCTIONS