Lenze 8400 motec - Manual (Page 278)

8 Basic functions
8.2 Holding brake control
278 Lenze · 8400 motec · Reference manual · DMS 4.1 EN · 08/2013 · TD05
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8.2.2 Process when brake is released
1. The controller inhibit is deactivated.
2. The magnetic field required for the holding torque is created in the motor (is already available
when a synchronous machine is used).
3. For brake release, the bBrkReleaseOut trigger signal for triggering the power output is set to
TRUE.
4. After the brake opening time has elapsed:
• The bBrkReleased status signal ("brake released") is set to TRUE.
• The drive synchronises to the already accelerated speed setpoint.
Time diagram
[8-5] Release holding brake in automatic mode via speed threshold
Related topics:
 Feedforward control of the motor before release ( 282)
 Feedforward control
 Setpoint synchronisation
 Follow setpoint
 C02581/1 : Switching threshold
 C02581/2 : Hysteresis for release
 C02581/3 : Hysteresis for application
 Time slot for magnetising
 C02589/2 : Release time
 Ramp time for approaching the setpoint speed
bBrkReleaseOut
0
0 1 2
bBrkReleased
CINH
t
t
t
Œ
Œ 
t
nSpeedSetValue_a
nSpeedSetValue_a_

‘

Œ Ž