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7 General
7.8
Control circuit for motor-holding brake
A 24V / max.1.5A holding brake in the motor can be controlled directly by the amplifier.
Check voltage drop, measure the voltage at brake input and check brake function (brake
and no brake).
This function does not ensure personnel safety!
The brake function must be enabled through the BRAKE parameter (screen page: Motor,
setting: WITH). In the diagram below you can see the timing and functional relationships
between the ENABLE signal, speed setpoint, speed and braking force.
During the internal ENABLE delay time of 100ms, the speed setpoint of the servo amplifier is
internally driven down an adjustable ramp to 0V. The output for the brake is switched on when
the speed has fallen to 3% of the preset final speed, at the latest after 1 second.
The rise (f
) and fall (f
) times of the holding brake that is built into the motor are different for
brH
brL
the various types of motor (see motor manual). A description of the interface can be found on
page 47 . Operation of the brake in a manner that provides personnel safety requires an
additional "make" contact in the brake circuit, and a suppressor device, such as a varistor, for
the brake circuit.
Recommended circuit:
Page 24
Installation manual for PMCtendo DD5/PMCprimo Drive3
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