Description Of Stop B - Siemens SINUMERIK 840D sl Function Manual

Safety Functions Integrated in the System/Drive
6.3 Safe Stops A–F
6.3.3

Description of STOP B

Action in the drive monitoring channel:
The drive is braked along the OFF3 ramp by entering a speed setpoint = 0. If the
speed setpoint falls below the value entered into p9560: "SI motion, pulse cancella-
tion shutdown speed", or if the timer p9556: "SI motion, delay time expired", then
the system automatically changes into a STOP A.
Action in the NCK monitoring channel:
Analog to the drive, the control enters a speed setoint of 0 and when the value in
MD 36960: $MA_SAFE_STANDSTILL_VELO_TOL is fallen below or after the
timer MD 36956: $MA_SAFE_PULSE_DISABLE_DELAY has expired, then a tran-
sition is automatically made to STOP A.
If the timer in data 36956: $MA_SAFE_PULSE_DISABLE_DELAY or p 9556: "SI
motion pulse cancellation, delay time" is set to zero, then for a STOP B, the
system immediately changes over to a STOP A.
The shutdown speed for the pulse cancellation is generally reached faster than the
delay time for the pulse cancellation.
S Effect:
The drive is braked along the OFF3 ramp under closed–loop speed control and
brought to a safe standstill.
S Alarm message for an internally initiated STOP B
The alarm message "STOP B initiated" is displayed.
S Alarm message for an internally initiated STOP B:
An unintentional restart is prevented using a STOP A. The error can only be
acknowledged from the drive and control using a power on.
SGA STOP A/B is active
This signal indicates that STOP A/B is active.
0 signal:
1 signal:
6-134
SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) – 05.2008 Edition
STOP A/B is not active.
STOP A/B is active.
© Siemens AG 2008 All Rights Reserved
05.08