Lenze 8400 motec - Manual (Page 279)

Lenze · 8400 motec · Reference manual · DMS 4.1 EN · 08/2013 · TD05 279
8 Basic functions
8.2 Holding brake control
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
8.2.3 Process when brake is closed
1. The motor is decelerated when the setpoint is reduced by the user (e.g. turn down the
potentiometer, setpoint selection via CAN).
• The motor can also be decelerated by the "Quick stop" function or by "DC-injection braking",
either directly requested by the user or as response to an error.
2. If the speed setpoint and the actual speed have fallen below the lower speed threshold or only
the speed setpoint has fallen below the lower speed threshold and the actual value monitoring
time has expired:
• For closing the brake, the bBrkReleaseOut trigger signal for triggering the power output is set
to FALSE.
• The bBrkReleased status signal is reset to FALSE.
• The brake application time starts to expire.
3. After the brake application time has expired, the controller is inhibited.
Time diagrams
[8-6] Close holding brake in automatic mode via speed threshold (actual value = setpoint)
 Feedforward control
 C02581/1 : Switching threshold
 C02581/2 : Hysteresis for release
 C02581/3 : Hysteresis for application
 C02593/2 : Application delay
 C02589/1 : Application time
Œ 
bBrkReleaseOut
0
0
bBrkReleased
CINH
t
t
t
t
  
0
nSpeedSetValue_a_
nSpeedSetValue_a
Œ
Œ Ž