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3 Operation and Repairs
Duty types and thermal protection
• In S1 duty class motors a temperature sensor (TS) can be used in addition
to the motor circuit breaker as required by DIN EN 60079-14, VDE 0165.
• If in S1 duty cycle motors protection is to be provided against overheating
only by means of the TS, a proven combination of TS and tripping device
is to be used for said purpose.
• In the case of non-S1 duty cycle motors proven combinations of TS and
tripping device must be used as protection against overheating.
• The supplying of power to the motors via the frequency converter is
permissible only if a proven combination of TS on the windings and
tripping device is used.
The temperature sensors must be connected as specified in the Section
"Motors with temperature monitoring", page 25.
Special operating conditions
The operating of the motors at ambient temperatures outside the generally
valid range of –20 to +40 °C is allowed also without heater if an appropriate
temperature range – e.g. –55 °C ≤ T
amb
≤ 60 °C – is specified on the rating
plate.
Operation at less than –20°C is allowed also without any additional
indication if the temperature of the entire motor is maintained at least at
-20 °C by means of a space heater.
At motor temperatures of less than -20°C the heater must not be started, as
these are not explosion-protected.
(Î Section "Motors with space heater", page 26).
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