Switching Off The Motor When Ss1 Is Active - Siemens SINAMICS G120 Function Manual
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2.4 Safe Stop 1, SS1
2.4.5
Switching off the motor when SS1 is active
If you switch the motor off with the OFF1 or OFF3 command while the SS1 safety function is
active, for example when limit switches are reached, this does not affect how the motor
behaves. SS1 remains active and the inverter brakes the motor with the OFF3 ramp-down
time until the standstill detection threshold is reached.
If you switch off the motor with the OFF2 command when the SS1 safety function is active,
then the inverter immediately safely switches off the motor torque (STO). The motor then
coasts to a standstill.
Figure 2-6
To switch the motor on again, you must proceed as follows:
● Deselect the SS1 safety function.
● Select the OFF2 command.
● Switch off the motor with the ON/OFF1 command and then switch on again.
26
OFF2 command when the SS1 safety function is active (example: SS1 mode 1)
Safety Integrated Function Manual, SINAMICS G120 and G120C
Function Manual, 01/2011, FW 4.4, A5E03052391B AB
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