Brake System; Connection Diagram - WEG CFW-11 Applications Manual

Crane Horizontal Motion

2.2 BRAKE SYSTEM

The brake is the element of the crane responsible for hold the load when the motor is not running. Therefore it is
very important that it be configured to operate in the safest way possible.
The electromagnet coil is powered by direct current (DC) which can be supplied by a DC voltage source or
bridge rectifier which converts AC to DC current. The bridge rectifier consists of diodes and varistors that filter
undesirable voltage spikes and enable fast current shutdown.
NOTE!
It is recommended always power the brake by direct current (DC) as it provides greater speed and
reliable brake operation.

2.2.1 Connection Diagram

NOTE!
The following connection diagrams shown are valid for WEG brake motors. The same must be
suitable for other types of brake or brake motor.
2.2.1.1 AC Power Supply
Usually brake motors admit two braking systems: normal and fast.
■
Normal Braking: the interruption of DC power to brake closing is done by removal of the AC power supply to
terminals 1 and 2.
Figure 2.5 Connection diagram of the bridge rectifier for normal braking
–
Crane Horizontal Motion | 19