BECKHOFF AX2500 - Manual (Page 21)

6.4 Control for motor holding brake
A motor holding brake (24V, max.1.5 A) can be controlled directly by the servo 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 (on the screen page
for Motor): the setting is 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 100 ms (DECDIS) the speed setpoint of the servo
amplifier is internally driven down a 10 ms ramp to 0. The brake output is switched on
when a speed of 5 rpm is reached, at the latest after 5s (EMRGTO).
The rise (f
brH
) and fall (f
brL
) times of the holding brakes that are built into the motors vary
for the different types of motor (see motor manual). A description of the interface can be
found on page 48.
Personnel-safe operation of the holding brake requires an additional “make” contact in
the brake circuit and a spark suppressor device (e.g. a varistor) in the recommended
brake circuit:
AX2500 Product Manual 21
BECKHOFF
06/2007
Technical description
AX2500