9basic drive functions (mck) – Lenze 8400 TopLine User Manual
Page 660
9
Basic drive functions (MCK)
9.12
Holding brake control
660
Lenze · 8400 TopLine · Reference manual · DMS 6.0 EN · 06/2014 · TD05/TD14
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Mode 12: Automatic control
In this mode, the brake is controlled automatically.
• If the requested speed setpoint reaches a parameterisable upper speed threshold that allows
traversing of the drive, the brake will be released and operation enabled.
• On the other hand, if speed setpoint and actual speed fall below a parameterisable lower speed
threshold, the brake will be applied under consideration of different time parameters.
• For operating modes with setpoint request via control signal (e.g. "PosExecute" in the
" operating mode), the speed thresholds do not apply. Here the control logic opens
and closes the holding brake through internal commands in the Motion Control Kernel.
• The brake will also be activated automatically if quick stop is activated in the drive, e.g. by a
device command or as response to an error, and in the event of controller inhibit or pulse inhibit.
• After automatic brake activation and expiration of the brake application time, the controller is
inhibited automatically by the basic "Holding brake control" function.
Tip!
The 2/12 mode is the usual mode to control the brake.
Mode 13: Semi-automatic control
In this mode, brake release and brake application can be directly controlled via the bMBrakeRelease
input without special logic or automatic.
In contrast to the manual operation (mode 11)
• the feedforward control is active in this mode, preventing a sagging e.g. in case of a hoist.
• the brake in this mode also closes when the controller is inhibited in order to prevent the axis in
a hoist from falling.
Related topics:
Behaviour in case of pulse inhibit
Danger!
In this mode, the input bMBrakeRelease should be permanently set to FALSE unless
manual release (supervisor operation) is required.
If the bMBrakeRelease input is set to TRUE, the brake is released immediately, even if the
controller is inhibited!