EMK
Operating and maintenance guidelines
9
Instruction manual
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Spring-operated brake EMK-KHF 3-Phase-Induction-motors
General Description
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Application
DThe spring-operated DC-energized disc brakes are
used for the EMK three-phase AC motors of the KHF
series in frame sizes 80 - 132. The brake must not be
operated in potentially explosive or aggressive atmos-
pheres. Ambient temperature: -20°C to + 40°C
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Design and mode of operation
The brake is a single-disc brake with two friction
surfaces. In the de-energized state, more preloading
springs are used to generate the braking torque due to frictional locking. The brake is released electromagneti-
cally.
During the braking process, the brake disc is pressed against the counter friction surface by the compression
springs. In the braked state, there is an air gap between the magnetic part and the armature plate. By activating
the coil of the magnet part, the armature plate is pressed against the spring force to the magnet part and the
brake is released. In addition, the brake can be released mechanically by pulling the release lever in the direction
of the fan cover.
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Operation
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Electrical wiring
The connection of the brake motor must in accordance with the circuit in the motor terminal box. The AC voltage
for the excitation winding of the brake must be connected to the two free terminals (~) of the rectifier.
Fig: Brake assembly
Fig. Brake circuit
