Lenze 8400 motec - Manual (Page 277)

Lenze · 8400 motec · Reference manual · DMS 4.1 EN · 08/2013 · TD05 277
8 Basic functions
8.2 Holding brake control
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
8.2.1.6 Motor magnetising time (only with asynchronous motor)
When an asynchronous motor is used, first the magnetic field required for the holding torque is
created (which is already available when a synchronous motor is used) after the controller inhibit is
deactivated and before the brake is released:
[8-4] Chronological sequence of the brake output signal
8.2.1.7 Actual value monitoring
If an actual value monitoring time > 0 s is selected in C02593/1 , the actual speed time monitoring
is active.
• The monitoring time starts when the speed setpoint has reached the lower switching threshold
and the actual speed is still above this threshold. (see illustration [8-7] in chapter " Process when
brake is closed ".)
• If the actual speed is still above the threshold when the monitoring time has expired, the brake
will be automatically applied in the automatic brake control mode (mode 12).
 Motor magnetising time (200 ms)
CINH = controller inhibit
• The frequency related to the lower speed
threshold is output for 200 ms unless the
premagnetisation has not been
deactivated via bit 4 in C02582 .
• The same frequency is output to the motor
during the release time set in C02589/2 .
• The direction of rotation depends on the
settings in C02582 (bit 2/3) and the
setpoint speed.
t
t
t
CINH
bBRKReleaseOut
I
BRK
200 ms
Œ

Note!
Function only possible if speed feedback via the digital input terminals DI1/DI2 is
available.  Encoder/feedback system ( 158)

Note!
In the Lenze setting, the actual speed time monitoring is deactivated ( C02593/1 = "0 s"),
i.e. the brake will only be applied when the actual speed has reached the lower switching
threshold if speed feedback is available.