Configuration
7-65
48XX/49XXSHB0399
7.4.5.2 Open brake (release)
CW/CCW enable deactivates the internal controller inhibit immediately. At the
same time, the field current reduction is reset. If the field current threshold (C245)
is exceeded, the controller generates a torque or holding torque against the brake.
The drive provides the load torque while the brake is releasing. In phase-controlled
operation the holding torque is generated through the I-component of the speed
controller when a phase failure occurs. If the phase controller is not active (C005
= -10-, -11-) the holding torque is determined under C244.
CW/CCW enable activates a time element. After the time set under C196, the
set-value integrator is enables and the torque is determined by the speed controller
again.
Note!
The function “release brake” is interrupted, if the speed exceeds the value set
under C019. The controller immediately starts speed or phase controlled
operation.
4900Str051
I
F
&
I
A
FDO
C W /C C W enable
Threshold
C 244
Threshold
C 245
IM P
(T rip )
R elease holding brake
FIG 7-24 Block diagram ’Release brake’
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