Siemens SINAMICS G220 - Page 667

Action Motor/converter response
① Selection of SS1
• The converter detects selection of SS1 and signals the status
"SS1 active" (r9722.1).
• The converter starts the transition time SS1 to STO (p9556) and
the SAM delay time (p9582).
• The converter stops the motor along the OFF3 ramp.
• Deselecting SS1 after the time ① does not interrupt the stop‐
ping of the motor.
② Braking along an OFF3 ramp
with SAM monitoring
• The SAM delay time elapses. With SAM, the converter monitors
whether the motor impermissibly accelerates.
• The SAM limit value follows the falling motor speed:
The converter reduces the SAM monitoring speed in steps when
the absolute value of the motor speed is less than the previous
SAM monitoring speed.
It is not possible to increase the SAM monitoring speed.
• If the motor speed exceeds the SAM monitoring speed by more
than the speed tolerance (p9548), then the converter signals a
fault and activates STO.
• If the motor speed reaches the SAM limit value (p9568), then
the converter limits the value for the SAM monitoring to p9568.
• As long as the speed decreases, the converter continuously
adds the con󹪝gurable tolerance p9548 to the current speed and
the monitoring of the speed adjusts accordingly. If the speed
temporarily increases, the monitoring threshold remains at the
last value.
③ Transition to STO
• SAM ends when the motor speed falls below the STO shutdown
speed (p9560), or the SS1 to STO (p9556) transition time ex‐
pires.
• The converter activates STO.
• The converter activates STO even if SS1 is deselected in the
meantime.
• The converter signals the status "STO active" (r9722.0).
• STO interrupts the torque-generating supply of energy to the
motor and prevents the motor from unexpectedly restarting.
• The motor coasts down to a standstill.
④ Deselection of SS1
• The converter detects deselection of SS1. The converter deac‐
tivates STO.
⑤ Signal change at ON/OFF1
from 1 to 0
• The converter is ready to start again.
⑥ Signal change at ON/OFF1
from 0 to 1
• The motor starts again.
Parameters
The following list contains the parameters of the "Safe Stop 1 with acceleration monitoring (SS1-
a)" function.
Functions
14.12Safety Integrated
SINAMICS G220 converter
Operating Instructions, 04/2024, FW V6.2, A5E51781573B AB 665