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• Install an interlock circuit that switches off the anti-condensation heating
once the main machine is switched on.
• Only switch on the anti-condensation heating after the machine has been
switched off.
2.8
Voltage and frequency fluctuations during line
operation
Maintain the ranges stated on the rating plate and in the documentation
(e.g. range B acc. to IEC/EN 60034-1) for voltage fluctuation ( ± 10 %) and
frequency fluctuation ( ± 2 %) at all times.
NOTICE
Overheating of the winding
Tolerances must not be exceeded. Impermissibly high winding
temperatures and therefore long-term damage to the machine can result.
Keep within the permissible tolerance for voltage and frequency.
Every machine must be protected against an inadmissible temperature rise.
Observe the following notes:
• Protect every machine according to IEC/EN 60079–14 using a current-
dependent, delayed circuit breaker with phase failure protection according
to IEC/EN 60947 or a similar device in all phases.
• Set the protective device to the rated current (value is stamped on the
rating plate).
• Protect the windings in a delta connection in such a way that the tripping
unit or relay is connected in series with the winding phases. When selecting
and setting the tripping unit, define the rated value of the phase current.
The phase current is 0.58 times the rated machine current. Any thermal
machine protection via direct temperature monitoring to be used in
addition to the machine circuit breaker is specified on the rating plate if
required.
2.9
Rotational speed limit values
Danger as a result of resonance within certain speed range
At over-critical speeds, machines encounter resonance within certain speed
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