4.8 Interlock circuit for anti-condensation heating
If the anti-condensation heating is operated while the machine is running, this can increase the
temperatures inside the machine.
• Install an interlock circuit that switches o the anti-condensation heating once the main
machine is switched on.
• Only switch on the anti-condensation heating after the motor has been switched o. Comply
with the data stamped on the plate of the anti-condensation heating, if available.
4.9 Noise emission
Prevention of hearing damage
If the permissible sound pressure level is exceeded, hearing damage can occur when
operating three-phase motors at their rated power.
The permissible sound pressure level is 70dB (A).
4.10 Voltage and frequency uctuations during line operation
Unless otherwise stated on the rating plate, the permissible voltage/frequency uctuation
corresponds to ZoneB in IEC/EN60034‑1.
Material damage due to excessively high winding temperature rise
Do not exceed the winding temperature tolerances. Inadmissibly high winding temperatures
can damage the machine over the long term.
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,
dene 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 specied on the rating plate if required.
See also
Thermal protection (Page51)
Preparing for use
4.10Voltage and frequency uctuations during line operation
1MB..1/2/3/4 - shaft heights 63 ... 355
Operating Instructions, 11/2023, A5E52779900A 53
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