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Motors with space heater
Terminals HE1-HE2 or U1-V1
The rating data for the space heater are specified either on the rating plate
or on a separate plate. Depending on the model, there are two heating
variants:
• by means of heater bands powered via terminals HE1-HE2 or
• by means of the stator winding by feeding AC voltage to terminals U1-
V1.
Please note!
Make sure by means of the electric control that the motor
voltage and the heater voltage are not fed simultaneously.
Please note!
The heater is not explosion-protected. It must not be switched
on at motor temperatures below -20°C to heat the motor to at
least –20°C. On the contrary, its purpose is that of preventing
that the motor temperature falls below –20°C when idle.
Motors for operating on frequency converters
For operating on frequency converters, motors with temperature
monitoring must be protected by PTC temperature sensors (Î Section
"Motors with temperature monitoring", page 25). The rating data for this
operating mode are specified either on the rating plate or on a separate
plate. If the relevant plate is missing, see the data provided in the
manufacturer catalogue "Explosion-protected high and low voltage AC
motors in II 2 G/D EEx d(e) IIC(B) T4...T6“
(Î Torque curves see diagram 1 to 6, page 28+29).
Check the drive's "electromagnetic compatibility" as per EMC directive no.
89/336/EEC when operating on frequency converters.
Make sure when operating motors on frequency converters that the
admissible voltage peak value named below are not exceeded by the
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