Description
3.3 Accessories
Installation and Operating Instructions SINAMICS G180
Operating Instructions, 02/2019, 4BS0751-007
41
Shutdown concept ATEX motor temperature monitoring
Principle of operation
Peripheral board 2 / 4 evaluates the motor temperature sensed using a PTC thermistor. The
board guarantees safety and reliability as a result of the integrated short-circuit detection and
sensor cable. Function "Safe torque off" of peripheral boards 3 / 4 and function "ATEX motor
temperature monitoring" utilize the same shutdown path:
Figure 3-1
Electronic shutdown concept
The inverter control processes the peripheral board signal. In the case of an excessively high
motor temperature or for the "Safe torque off" function, the inverter inhibits the IGBT firing
signals. The supply voltage for the driver stages is additionally switched off. These two
switch-off paths ensure that the power infeed to the motor is immediately interrupted. This
rules out any additional motor temperature rise or motor rotation. You can only reset the
inverter or switch it on again if the motor has cooled down sufficiently.
If the power fails, then the inverter safely interrupts the power infeed to the motor as firing
signals are no longer transferred. If a fault was active at the moment of power failure, the
inverter remains in a fault condition, also after power returns.
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