-18- B1091-GB-3212 www.nord.com
8. Options for motors used in
Zone 22
8.1 Option inverter operation
ATEX NORD motors for Zone 22 are suitable for inverter operation due to their insulation system design.
Because of the variable rpm range, temperature monitoring with PTC resistors or temperature monitors is
necessary. For safe engineering and application, comply with the engineering guideline "Operation of ATEX
motors with frequency inverters", No. 605 2101. The engineering guideline provides information about the
necessary requirements for inverter operation and about the permitted rpm ranges.
8.2 Option external fan
Motors with the additional designation F (e.g. 80S/4 3D F) are equipped with an external fan and must be
monitored via the integrated temperature sensor.
Attention!
The motor may only be operated together with the external fan! A failure of the external fan can lead to the
motor overheating and therefore endanger property/persons.
Comply with the operating instructions for the external fan!
The power supply for the external fan is provided independently via the external fan terminal box. The
external fan power supply must be identical to the voltage rating given on the name plate. The external fans
must be protected against overheating with suitable monitoring equipment! The IP protection classes of the
external fan and motor may be different. The lower IP protection class applies to the drive unit. The cable
glands must as a minimum correspond to the protection type specified on the name plate. Unused openings
must be closed with plugs, which as a minimum correspond to the protection class of the motor.
External fans and motors for use in hazardous areas have an Ex designation as per guideline 94/9 EC. This
designation must be present on the external fan and on the motor. If the designations of the external fan and
the motor differ, the lowest designated explosion protection applies to the entire drive. The maximum
specified temperature given in the surface temperature data for the individual components applies for the
entire drive unit In this case, it may be necessary to take into account any gears that may be present.
Contact Getriebebau NORD if there are any doubts.
If any component in the entire drive does not have an Ex designation, then the entire drive may not be
operated in an Ex area.
8.3 Option return stop
Motors with the additional designation RLS (e.g. 80S/4 3D RLS) are equipped with a return stop.
Motors with return stops have an arrow marking the direction of rotation on the ventilation cover. The arrow
points in the rotation direction of the motor. It must be ensured, when connecting the motor and during motor
control, that the motor can only operate in the rotation direction, e.g. by means of a rotary field test.
Switching the motor to the blocked rotation direction, i.e. incorrect rotation direction, can lead to damage.
Return stops operate without wear from a speed of ca. 800 1/min.. Return stops must not be operated at
speeds under 800 l/min to prevent unpermitted heating and rapid wear of the return stop. This must be taken
into account for motors with a frequency of 50 Hz and poles ≥ 8, and for motors with frequency inverters.
8.4 Option brake
Motors with the additional designation BRE (e.g. 80S/4 3D BRE 10) are equipped with a brake and must be
monitored via the integrated temperature sensor. If the temperature sensor of one of the components (motor
or brake) is triggered, the entire drive must be securely shutdown. The motor and brake PTC's must be
switched in series.
Attention!
The brake DC voltage supply must be implemented via a rectifier located in the motor terminal box or via a
directly supplied voltage. The brake voltage shown on the name plate must be complied with.
The power supply lines must not be laid in a cable together with the temperature sensor circuit. The brake
functionality must be checked before start-up. There should be no grinding noises, as this could lead to
unpermitted excessive heating.
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