Siemens SINAMICS S120 Function Manual page 438

Function modules
8.3 Extended Brake Control
Now, only the brake opening time will delay the motor starting to rotate following activation of
the master switch. If the master switch is moved (deflected), then there is a "setpoint enable
from the control" (bit interconnected with p1142, r1229.3, p1224.0). The speed controller is
enabled immediately. Once the brake opening time has elapsed (p1216), the speed setpoint
is enabled. When the master switch is in the zero position, the speed setpoint is inhibited
and the drive brakes along the deceleration ramp of the ramp-function generator. The brake
closes when the speed drops below the standstill limit (p1226). After the brake closing time
(p1217), the speed controller is inhibited (no motor force!). The extended brake control is
used.
Figure 8-4 Example of operating brake for a crane drive
438
Function Manual, (FH1), 04/2014, 6SL3097-4AB00-0BP4
Drive functions