-16- B1091-GB-3212 www.nord.com
7. IE2-ATEX Motors for use in
Zone 21 and Zone 22
7.3.3 Permissible Ambient Temperature Range
The permissible ambient temperature range for all motors is -20°C...+40°C. A greater ambient temperature
range of -20°C...+60°C is permissible with motors for operation in Zones 21 and 22. This does not however
apply with the option brake and external fans! In this case, the rated power must be reduced to 72% of the
value stated in the catalogue. If the maximum ambient temperature is between +40°C and +60°C, the power
output should be inversely linearly interpolated between 100% and 72%. In this case thermal protection of
the motor by means of a thermistor sensor is essential. The motor connection cables and the cable glands
must be suitable for temperatures of at least 100°C.
7.3.4 Painting
Motors for Zone 21 and Zone 22 are provided with suitable painting ex-works.
Subsequent painting may only be carried out after consultation with Getriebebau NORD or a workshop which
is approved for the repair of explosion protected motors. Compliance with the valid standards and regulations
is mandatory.
7.3.5 IEC-B14 Motors
The B14 flanged bearing plate must be covered with a protective foil which must be removed before the mo-
tor is fastened in place. All four fixing screws, even if not required, must be screwed into the flanged bearing
plate! The fixing screw threads must be inserted with a sealant, e.g. Loctite 242. The maximum screw-in
depth in the bearing plate is 2 x d.
If the end of the shaft faces upwards, e.g. version IMV3, IMV6, a cover must be provided by the operator /
installer, which prevents foreign bodies from falling into the fan cover of the motor (see DIN EN 60079-017,
item 17). This must not obstruct the fan from cooling the motor. If the end of the shaft faces downwards, e.g.
versions IMV1, IMV5, motors for Zone 21 and Zone 22 are provided with a protective cover on the fan cover.
A hand wheel on the second end of the shaft is not permitted for versions with the "shaft end downwards".
Unless otherwise specified for operating modes and tolerances in the test certificate or name plate, electrical
machinery is designed for continuous operation and normal infrequent start-ups where insignificant start-up
heating occurs. The motors may only be used for the type of operation stated on the name plate.
The installation instructions must be strictly observed.
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