Clutch Brake Connection Diagram with Motor and Rectifier Module

We know that Clutch Brake Motors are used in Cranes, Lifting Machines, and many other heavy and important applications. Generally, the clutch brake is attached to the motor shaft. The main function of the clutch brake motor is to stop instantly. As this type of motor provides a very accurate starting and stopping they are used where frequent starting and stopping are required. In normal conditions, when there is no power supply the clutch brake will resist rotating the motor shaft and when the clutch brake coil is energized by a power supply it will release the motor shaft to rotate. 

Generally, the brake coil is connected in parallel with the motor coil power supply so when a power supply is applied to the motor to start running the brake will be energized at the same time and will release the motor shaft to rotate. And when we remove the power supply the motor to stop the brake coil also disconnected from the power supply and it instantly stop the motor. The normal motor that is not connected to the brake will not stop instantly, it takes some time to stop.

Motor and Brake Connection Diagram with Rectifier Module

When a clutch brake is attached to a three-phase motor, we need a solid-state rectifier module to connect the brake coil to the motor.

Connection Procedure

Generally, two types of brake coil are used - single-phase AC or DC brake coil. Their connection procedure is also different.

AC Braking Connection Procedure

If your brake coil is designed to operate with AC then follow the below procedure,

1. Connect any two phases from the three-phase power supply to the AC input of the rectifier module.
2. Connect the brake coil to the DC output terminal of the rectifier module.
3. Now short the switching terminals of the rectifier with a wire.

DC Braking Connection Procedure

If your brake coil is designed to operate with DC then follow the below procedure,

1. Connect any two phases from the three-phase power supply to the AC input of the rectifier module.
2. Connect the brake coil to the DC output terminal of the rectifier module. Remember that here polarity of the connection is important.
3. Here, use a three-phase contactor through which the three-phase power supply will come to the motor.
4. Now, connect the switching terminals of the rectifier module to the NO contacts of that contactor.

So in the AC braking system, there is no need for a contactor. You may use a contactor for the power supply connection only. In this method, the switching terminals of the rectifier are shorted with a wire so it always is in closed condition.

On the other hand, in the DC braking system, you must need a contactor where both the power supply connection and switching connection are required. In this method, when the contactor will turn On, the switching contact will be going to the closed condition otherwise they remain in open condition.

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