Motors – Operating and Assembly Instructions
42 B 1091 en-3118
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3.4 Options for motors for use in Zone 21 and Zone 22
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DANGER!
Explosion hazard
All work must only be carried out with the machine at a standstill and the power to the system
switched off.
Higher temperatures than the maximum permitted surface temperature of the housing may
be present inside the motor. The motor must therefore never be opened in an explosive
atmosphere!
Failure to comply with this may result in the ignition of an explosive atmosphere.
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WARNING
Explosion hazard
Excessively heavy dust deposits must be avoided, as these impair the cooling of the device!
Impairment or obstruction of the flow of cooling air, for example due to partial or large area
coverage of the fan cover or the entry of foreign bodies fall into the fan must be avoided in
order to ensure adequate cooling.
Only cable glands and reducers which are approved for use in explosion hazard areas may
be used.
All cable glands which are not used must be closed with blind screw plugs which are approved
for potentially explosive areas.
Only the original seals may be used.
Failure to comply increases the risk of ignition of an explosive atmosphere.
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3.4.1 Operation with frequency inverter
The design of the insulation of NORD ATEX motors with ignition protection class tb and tc is suitable for
operation with a frequency inverter. Due to the variable speed range, temperature monitoring by means
of thermistors or temperature sensors is necessary. For safe planning and use, the planning guide for
the operating and installation instructions B1091-1
must be observed. The planning guide provides
information regarding the necessary conditions for inverter operation and the approved speed ranges.
Option Z (additional high inertia cast iron fan) is not permitted for inverter operation.
If the frequency inverter is not approved for operation within the explosive atmosphere, the frequency
inverter must be installed outside of the explosive atmosphere.
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