Motors – Operating and Assembly Instructions
32 B 1091 en-3118
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3.2.5 Further operating conditions
The motors are designed for continuous operation and normal, non recurring starting, in which no
significant starting heat occurs.
Range A in EN 60034-1 (VDE 0530 Part 1) - Voltage ± 5%, Frequency ± 2%, curve form, mains
symmetry - must be complied with so that the development of heat remains within the permissible limits.
Any major deviations from the rated values can cause an impermissible increase in the development of
heat in the motor.
The motor temperature class stated on the type plate must at least conform to the temperature class of
any combustible gas that may occur.
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3.2.6 Protective devices
Protective devices must be adjusted to the rated current. For windings with a delta circuit, the triggers
are connected in series with the windings and adjusted to 0.58x the rated current.
Alternatively, the motors can be protected with thermistor temperature sensors. Protection with
thermistor temperature sensors is mandatory for inverter operation.
Do not apply voltages greater than 30 V to the thermistor temperature sensor.
We recommend the use of a functionally tested, certified PTC trigger device for protection with a
thermistor temperature sensor.
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The following standards must be observed for the installation of electrical systems in explosion
hazard areas in Germany: DIN EN 60079-14 (VDE 0165-1), the Technical Rules for Operating
Safety (TRBS), the Operating Safety Regulations (BetrSichV), the Hazardous Substances
Regulation (GefStoffV) as well as the Explosion Protection Regulations (Ex-RL). Other
regulations must be observed if applicable. The applicable national regulation must be observed
outside of Germany.
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3.2.7 Repairs
Repairs must be carried out by Getriebebau NORD or by an officially recognised expert. The work must
be indicated with an additional repair plate. With the exception of standard, commercially available and
equivalent components, only original spare parts (see spare parts list) may be used. The particularly
applies for seals and connecting components.
For motors with closed condensation outlets, the threads of the closing screws must be coated with
Loctite 242 or Loxeal 82-21 after the condensation has been drained. The closing screws must be re-
inserted immediately. The electrical connections must be checked at regular intervals.
Check that the connection terminals, and the electrical bonding terminal are firmly fastened. Check that
the cable gland and the terminal box gasket are in good condition
All work on electrical machinery must be performed when the machine is at a standstill and with all poles
disconnected from the mains.
The motor must be removed for any measurement of the insulation resistance. The measurement must
not be performed in the explosion hazard area. As soon as measurement has been completed,
discharge the connecting terminals again immediately by shorting them in order to prevent any spark
discharges occurring in the explosive area.
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