Risk of explosion due to excessive bearing temperature
The surface temperature cannot be maintained within maximum permissible limits if the
bearing becomes too hot. The dust can ignite, resulting in an explosion. This can result in death,
serious injury or material damage.
• Monitor the bearing temperature (Page99).
• In addition to the current-dependent overload protection system located in the three phases
of the connecting cable, we recommend that you also monitor the temperature rise in the
machine using temperature sensors integrated in the stator winding.
Risk of explosion due to static charging
If you clean the motor, plastic components may become statically charged and ignite a
potentially explosive atmosphere. An explosion can occur. This can result in death, serious injury
or material damage.
• When cleaning, ensure that there is absolutely no explosive atmosphere present.
• Clean the plastic parts and components so that absolutely no static charging occurs
• Do not use compressed air for cleaning.
8.1.1 Safety instructions relating to ventilation and cooling
8.1.1.1 Forced ventilation (optional): Cooling method IC 416 in accordance with
EN/IEC60034-6
Explosion hazard if the temperature class is exceeded
If a force-ventilated machine is operated without a separately driven fan, the temperature class
or the maximum surface temperature of the machine can be exceeded.
In an explosive atmosphere, there is a risk of an explosion. This can result in death, serious
injury or material damage.
• Install an interlock circuit that prevents the machine from being switched on if the separately
driven fan is not switched on/is not operational.
• Do not commission the machine without a separately driven fan.
• Always use PTC thermistor monitoring when operating force-ventilated machines with a
converter. Trip units according to Directive 2014/34/EU ("Explosion Protection Directive") or
according to country regulations are always necessary when using PTC thermistor
monitoring.
Operation
8.1Safety instructions for operation
1MB..1/2/3/4 - shaft heights 63 ... 355
Operating Instructions, 11/2023, A5E52779900A 107
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