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Operation
8.1 Safety instructions for operation
Explosion hazard from hybrid mixtures
Hybrid mixtures are mixtures of flammable dusts with explosive gas/air atmospheres which can
together create a dangerous explosive atmosphere if they occur at the same time. Changes can
arise in the safety performance characteristics here, such as a change in the zonal classification,
increase in the explosion pressure, reduction in the minimum ignition energy and a reduction in
the maximum temperatures to be complied with.
An explosion can occur. This can result in death, serious injury or material damage.
• For this reason, the relative characteristics must be considered both for gas (zones 0, 1 and
2) and for dust (zones 20, 21 and 22) where hybrid mixtures arise. It is necessary for a
competent assessor to determine in the individual case whether the parameters determining
ignition are unfavorably affected in a particular hybrid mixture.
• Motors with dual plates for G ("Gas") and D ("Dust") may only be used where these two occur
after prior examination of the properties of the hybrid mixtures by the user.
• These explosion-protected machines are not suitable for hybrid explosive environments. Use
in atmospheres where there is a risk of explosion caused by both gas and dust simultaneously
is absolutely prohibited.
Explosion hazard due to overheating of the machine caused by a layer of dust
Deposits of dust have a thermal insulation effect, which can lead to the machine overheating.
The maximum surface temperature of the machine cannot be adhered to. The dust can ignite,
resulting in an explosion. This can result in death, serious injury or material damage.
• Dust the machine regularly.
• Do not allow dust layers thicker than 5 mm to build up on the machine surface.
• Do not switch the machine on until the dust has been removed.
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 (Page 96).
• 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.
104
1MB..5/6 shaft height 71 ... 355
Operating Instructions, 11/2023, A5E52779956A
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