For pole-changing motors, in addition to the circuit breaker, use temperature sensors in the
windings.
Ex d and Ex t
Line supply
• Set the protective device (e.g. circuit breaker) to the rated current (see the rating plate).
• Or protect the machine using the certied temperature monitoring specied on the
supplementary plate .
Converter
• Always operate explosion-protected machines fed from converters with temperature sensors
that directly monitor the temperature.
Ex e and Ex eb
Line supply
• Set the protective device (e.g. circuit breaker) to the rated current (see the rating plate), I
A
/I
N
and the locked rotor time (t
E
).
• Or protect the machine using the certied temperature monitoring specied on the
supplementary plate.
Converter
• Always operate explosion-protected machines fed from converters with temperature sensors
that directly monitor the temperature.
• Converter operation for these machines must be expressly certied. It is crucial that you
carefully observe the specic manufacturer's information and instructions. Converter,
machine and protective devices must be marked as belonging together and the permitted
operating data must be dened in the common EC-type examination certicate.
Ex n and Ex ec
Line supply
• Set the protective device (e.g. circuit breaker) to the rated current (see the rating plate).
• Or protect the machine using the certied temperature monitoring specied on the
supplementary plate .
Converter
• Always operate explosion-protected machines fed from converters with temperature sensors
that directly monitor the temperature.
• Converter operation for these machines must be expressly certied. Observe the specic
manufacturer's information and instructions
Preparing for use
4.7Thermal protection
1MB..1/2/3/4 - shaft heights 63 ... 355
52 Operating Instructions, 11/2023, A5E52779900A
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