Electric motors Size 63 - 225 ATEX / IECEx
Construction and function
2021-05-31
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4.3 Connection, motor protection
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Before connecting the explosion protected motor, check the following:
-
do the ratings on the type plate match the mains voltage and frequency?
-
does the explosion protection match the environment in which the motor is operated
(gas group, temperature class)?
The electrical connections are established using the terminal box. The connection diagram (wiring diagram)
is inside the terminal box.
Optionally the motors can be supplied with a motor cable instead of with a terminal box (
catalogue).
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If a standstill heating is present, the electrical controller has to ensure that the motor voltage and the heating
voltage cannot be applied simultaneously.
The motor protection can be implemented with a motor protection switch or a thermal sensor (PTC, PTO,
PT100).
For self-ventilated, single-speed motors in S1 mains operation with low-load and infrequent starts not
causing any significant heating, a motor protection switch is a sufficient measure to comply with explosion
protection requirements (temperature class).
Exclusive protection by temperature monitoring with thermal sensor for all modes other than S1 is only
permitted in connection with a
certified
triggering device. These triggering devices must have been certified
and marked by a notified body according to directive 2014/34/EU (IECEx). The devices must be included in
the regular monitoring by the operator.
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4.4 Obligations and conditions
Some gap lengths of the spark-proof gap of this equipment are greater, and some gap widths of the spark-
proof gap are smaller than required in Table 3 of EN/IEC 60079-1:2014. For information regarding the
dimensions, please contact the manufacturer.
To connect the pressure proof encapsulation, use screws with a yield point of at least 640 N/mm
2
.
Motors requiring direct temperature monitoring have to be monitored with a separately certified triggering
device (see 4.3).
Make sure when operating a 3-phase motor with an external fan that the motor can only be run while the
external fan is running. The external fan motor must comply with EPL Gb or Db.
Make sure not to exceed the permissible temperatures for the used components.
Only metal fan blades may be used if the temperature on the shaft journal in the fan blade area is >= 95°C
during rated operation.
The manufacturer specifies the electrical parameters, the temperature class and the ambient temperature
range of the respective version after a routine test.
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