Siemens SINAMICS S120 Function Manual page 475

Destruction of the holding brake as a result of incorrect parameterization
If the drive moves against the closed holding brake, this can destroy the holding brake and
as a consequence result in death or severe injury.
• If a holding brake is being used, do not set p1215 = 0.
• Correctly set all of the parameters involved.
Note
It is only permissible to activate brake control monitoring for power units of the "booksize"
and "blocksize with Safe Brake Relay" format (p1278 = 0).
Extended brake control for braking with feedback
For braking with feedback (p1275.5 = 1), the brake control reacts to the feedback signal
contacts of the brake. If the timer p1216 is greater than the time to the feedback signal, the
startup is delayed to the corresponding time difference.
In order to start up as far as possible without any delay, the set timer p1216 must be less
than the time to the feedback signal. If the timer is set lower however, alarm "A07931, brake
does not open" appears.
Remedy:
1. Activate "Release with feedback signal" (p1275.6 = 1).
The pulse enable (BO: r1229.3) and setpoint enable (BO: r0899.15) are now independent
of the set time level (p1217, p1216). The associated enable is determined only by the
feedback signal (BI: p1222, BI: p1223). The timers (p1216, p1217) only influence the
alarms A07931 "Brake does not open" and A07932 "Brake does not close".
2. Optional: In order that the alarms no longer appear, set the two timers (p1217, p1216) to
0 ms.
Result: The monitoring of the brake and the display of the alarms are switched off.
Note
Speed controller response when a brake is opened
Information on the speed controller response for vector control is provided in Chapter Speed
controller (Page 220).
Drive functions
Function Manual, 11/2017, 6SL3097-4AB00-0BP5
WARNING
Function modules
8.3 Extended Brake Control
475