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Preparations for use
4.10 Voltage and frequency fluctuations during line operation
4.7
Thermal protection
The machine is optionally equipped with PTC thermistors, Pt100 or Pt1000. If certification is
available, and the test data is stamped on the rating plate, then thermal machine protection is
permissible by directly monitoring the winding temperature. PTC thermistors for direct
temperature monitoring (sole protection) ensure explosion protection in conjunction with
function tested tripping devices in accordance with local regulations.
• Direct temperature monitoring for line (DOL) operation: You can operate the machine
without a circuit breaker. Evaluate the temperature sensors.
• Direct temperature monitoring for inverter operation: Evaluate the temperature sensors.
• If you have to perform a continuity test of the temperature sensors, do not apply a voltage
>2.5 V. If no test data is specified on the rating plate, this means that the winding protection
is only intended as an additional protection.
• For pole-changing machines, use a direct temperature monitoring sensor as stated on the
rating plate, e.g. PTC thermistor, for each speed level in addition to the separate, mutually
interlocked machine protection relays.
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 off the anti-condensation heating once the main
machine is switched on.
• Only switch on the anti-condensation heating after the motor has been switched off. 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 70 dB (A).
4.10
Voltage and frequency fluctuations during line operation
Unless otherwise stated on the rating plate, the permissible voltage/frequency fluctuation
corresponds to Zone B in IEC / EN 60034‑1.
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.
54
1MB..5/6 shaft height 71 ... 355
Operating Instructions, 11/2023, A5E52779956A
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