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 actual value falls below the value entered in p9560 "SI Motion pulse can-
cellation shutdown speed", or timer p9556 "SI Motion delay time expired", then a
transition is automatically made into STOP A.
Action in the NCK monitoring channel:
Analogous to the drive, the control system enters speed setpoint = 0 and when the
value in MD36960 $MA_SAFE_STANDSTILL_VELO_TOL is fallen below, or after
timer MD36956 $MA_SAFE_PULSE_DISABLE_DELAY expires, then a transition
is automatically made into STOP A.
Alternatively, braking can be realized drive--based along the OFF3 ramp
(see Chapter 6.3.5 "Braking behavior for STOP B/C").
If the timer in machine data 36956 $MA_SAFE_PULSE_DISABLE_DELAY or
P9556 "SI Motion pulse cancellation delay time" is set to zero, then for a STOP B
an immediate transition is made into 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 the STOP A/B is active.
0 signal:
1 signal:
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SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) - - 10.2015 Edition
STOP A/B is not active
STOP A/B is active
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