Nord Drivesystems B1091, Operating Manual With Installation Instructions

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3 ATEX Explosion hazard areas
B 1091 en-1221 43
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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 inverters
ATEX NORD motors with ignition protection classes tb and tc are suitable by their insulation system
design for operation with the frequency inverter. The variable speed range requires temperature
monitoring using PTC resistors. For safe planning and application, the planning guideline for operating
and installation instructions
B1091-1 must be observed. The planning guideline provides information
on the necessary prerequisites with inverter operation and on the approved speed ranges. Option Z
(Heavy fan, cast-iron fan) is not permitted for inverter operation.
If the frequency inverter is not approved for operation within the specified explosion hazard zone, the
frequency inverter is to be installed outside the explosion hazard area.