Nord Drivesystems B1091, Operating Manual With Installation Instructions

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3 ATEX Explosion hazard areas
B 1091 en-1221 33
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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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