3 ATEX Explosion hazard areas
B 1091 en-3118 25
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3.1.5 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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3.1.6 Protective devices
Each machine must be protected against excess heating by means of a current-dependent delayed
protection switch whose function is tested by a designated facility, with phase failure protection
according to VDE 0660 or an equivalent device. 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. If this circuit is not possible, additional protective measures are necessary (e.g.
thermal protection of the machine).
In case of a jammed rotor, the protective device must switch of within the specified t
E
-time for the relevant
temperature class.
Electrical machines with heavy starting (start-up time > 1.7 x t
E
-time) must be protected by means of
starting monitoring according to the details in the EEC type test certificate.
Thermal protection of the machine by means of direct temperature monitoring of the windings with a
thermistor temperature sensor is permissible, if this is certified and stated on the rating plate.
Do not apply voltages greater than 30 V to the thermistor temperature sensor.
If the only protection is a PTC thermistor temperature sensor, a performance-tested, PTC tripping device
certified by a designated body must be used. The PTC triggering device must be equipped with the
following protection class label:
II (2) G
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