Function library
Speed (speed control)
Holding brake control
12
341
EDBCSXS064 EN 4.0
12.27.4.1 Closing holding brake
A HIGH level on the input SPEED−BRK.SetBrake (C7411/10 = TRUE) activates the function.
At the same time, the output SPEED−BRK.SetQSP is set to HIGH. This signal can be used to
brake the drive to standstill via a deceleration ramp (speed = 0).
If the setpoint speed falls below the value set at the input SPEED−BRK.SpeedThreshold
(C7431/9), the output SPEED−BRK.Out is set to HIGH.
Note!
For a fail−safe design this signal must be inverted at the output (e. g. via
C0118).
After the brake closing time set C0195 has lapsed, the output SPEED−BRK.SetCInh switches
to TRUE. By means of this signal you can for example activate controller inhibit
(device−internal on the function block DCTRL). The setting of the brake closing time is
required because the brake is not immediately activated at SPEED−BRK.Out = TRUE (the
drive has to provide another holding torque for the set time).
t
t
t
t
t
0
1
ECSXASA002
Fig. 12−31 Signal characteristic − closing of holding brake
SPEED−BRK.SetBrake
SPEED−BRK.SetQSP
SPEED−BRK.MSetOut
SPEED−BRK.Out
SPEED−BRK.SetCInh
SPEED−BRK.SpeedThreshold
Brake closing time (C0195)
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