Note
OFF1 or OFF3 for active SS1
Switching the motor off via an OFF1 or OFF3 command while SS1 is active (e.g. by a limit
switch) does not influence the response of converter and motor.
SS1 remains active after the OFF command. After the delay time has elapsed, the converter
transitions to STO status.
SS1 with external stop (SS1E)
If several drives are connected with one another through a material web, then braking initiated
by a single drive at the related OFF3 ramp can damage the machine or system.
When the safety function SS1E is used, the drive is shut down using the user program of a
higher-level control system. Although the safe delay time is activated when SS1E is selected,
OFF3 is not activated. The converter signals via PROFIsafe or the Safety Info Channel (SIC)
of the supplementary telegram that SS1 was selected. Using an appropriate program, the
control must then ramp down the drives involved within the delay time to the safe state. After
the delay time has elapsed, the converter activates the STO function and safely interrupts the
energy feed to the motor (independent of the actual speed).
Safety functions integrated in the drive
4.2 Basic Functions
SINAMICS S210 servo drive system
Operating Instructions, 12/2017, A5E41702836B AA 65
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