Siemens SIMOTICS XP Operating Instructions Manual page 20

Safety information
2.13 Special conditions for use
• In the following cases, direct temperature monitoring using PTC thermistor or resistance
thermometer is required:
– Duty types other than S1
– Forced ventilation (external fan, water cooling), unless the cooling is ensured by
– Pole-changing rotating electrical machines
The certified tripping device required for this purpose must guarantee that the
temperature class specified on the device and/or the maximum surface temperature is not
exceeded.
• It is only permissible that the motor is controlled from a voltage source DC link converter
with pulse width modulation, complying with the characteristic variables stamped on the
motor.
• Anti-condensation heating elements can be mounted on the winding overhangs to protect
the winding. It is only permissible that these are operated when the motor is switched off.
Warning notes for safe operation are included in the operating instructions
A list of special conditions for safely using explosion-proof machines with X marking is
provided in the certificates (Page 149).
18
special measures (monitoring, instruction in the certificate/operating
instructions/rating plate).
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Operating Instructions, 10/2021, A5E41926185A