6.8.3 Switching off the motor when SDI is active
Description
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Figure 6-43 OFF1 command when the SDI safety function is active
If you switch off the motor with the SDI function active using the OFF1 or OFF3 command, e.g.
when reaching limit switches, the following happens:
1. The inverter brakes the motor with the OFF1 or OFF3 ramp-down time until the speed
reaches the standstill monitoring threshold.
2. Also while braking, the inverter monitors the direction of rotation.
You can set the behavior of the inverter after switching-off the motor in two different ways:
1. Feedback signal "SDI active" for pulse inhibit
remains active
With this setting, the inverter safely switches off the motor torque when reaching the
standstill monitoring using the STO safety function. The inverter ensures that the motor
does not actively accelerate. The "SDI active" signal also remains at 1 for a motor that has
been switched off.
2. Feedback signal "SDI active" for pulse inhibit
becomes inactive
With this setting the inverter inverter off the motor torque, but not safely. The system does
not safely prevent that the motor actively accelerates. Therefore, the inverter sets the "SDI
active" signal to 0 when the motor is switched off.
Operation
6.8 Safe Direction (SDI)
Safety Integrated - SINAMICS G110M, G120, G120C, G120D and SIMATIC ET 200pro FC-2
Function Manual, 01/2017, FW V4.7 SP6, A5E34261271B AD 283
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