2
Product description
Festo – GDCP-CMMO-ST-EA-SY-EN – 2017-05c – English
45
2.5.6
Actuating the holding brake
The integrated holding brake on the motor holds the actuator in its current position after lifting of the
controller inhibit. The holding brake is not suitable for braking the motor or the moved masses.
Note
Controlling motors with an integrated holding brake.
When the output stage is switched off during a movement or whenever the power sup
ply is interrupted, there is no deceleration of the actuator via a braking ramp. The hold
ing brake is closed immediately.
Check whether the integrated holding brake can stop the actuators.
Note the mechanical inertia of the holding brake.
Take into consideration the higher wear of the holding brake in comparison to auto
matic brake control in normal operation.
Automatic activation for a holding brake
The motor controller automatically controls the holding brake via the controller enable function:
–
The holding brake is opened as soon as the closed-loop controller has been released.
–
The holding brake is closed before the controller is blocked.
Controller enable:
Open-loop control via output X6.5 (BR+/BR-)
CONTROL ENABLE 0
è
1
Open holding brake
CONTROL ENABLE 1
è
0
Close holding brake
Tab. 2.38 Automatic brake control
The mechanical inertia of the holding brake means that it takes a certain length of time to open and
close it. The behaviour of the motor controller during control enable is adapted to the mechanical
inertia of the holding brake by the following parameters:
Parameters
Description
Switch-on delay
No orders are processed until the switch-on delay has elapsed. That
keeps the actuator at a standstill (setpoint speed=0). The engagement
delay must be set in such a way that the holding brake finishes up
completely open. After the engagement delay has elapsed, the motor
controller is ready for operation (READY) and orders are accepted.
Switch-off delay
The actuator is maintained in its current position by the closed-loop
controller until the end of the switch-off delay in its current position,
which enables the holding brake to reach its full holding torque level.
After that, the controller is disabled. The switch-on delay must be set in
such a way that the holding brake finishes up completely closed.
Tab. 2.39 Parameterisation of the holding brake
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FCT [...][Motor], Brake control
Содержание CMMO-ST-C5-1-DION
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