Interlock Circuit For Anti-Condensation Heating; Noise Emission; Voltage And Frequency Fluctuations During Line Operation - Siemens SIMOTICS XP 1MB 1 Series Operating Instructions Manual

Low-voltage motors

Table of Contents

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

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

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.

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.