Interlock Circuit For Anti-Condensation Heating; Noise Emission; Voltage And Frequency Fluctuations During Line Operation; Rotational Speed Limit Values - Siemens SIMOTICS SD Operating Instructions Manual

4.7

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.
4.8

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).
4.9

Voltage and frequency fluctuations during line operation

Unless otherwise stated on the rating plate, the permissible voltage/frequency fluctuation is
corresponds to Zone B in IEC / EN 60034‑1. Permissible fluctuations that go beyond this are
indicated on the rating plate – or for some versions, on a supplementary plate.
Operate the machine in continuous operation in Zone A. Prolonged operation in Zone B is
not recommended:
• Exceeding the permissible tolerances for voltage and frequency can lead to an impermissibly
high temperature rise of the winding. This can result in long-term damage to the winding.
• Limit exceptions of this sort with regard to the values that arise, how often, and for how long
they occur.
• Where possible and within a reasonable time take corrective actions such as reducing the
power. In this way you can avoid that the service life of the machine is reduced as a result of
thermal aging.
4.10

Rotational speed limit values

Danger as a result of resonance within certain speed ranges
At over-critical speeds, machines encounter resonance within certain speed ranges. Such
vibrations can reach impermissibly high levels. This can result in death, serious injury or material
damage.
• The controller must ensure that those speed ranges are blocked when the converter is in
operation. Please comply with the data on the blocked speed ranges specified in the electrical
data.
• The blocked speed ranges must be run through rapidly.
1LE5, 1PC4 shaft heights 280 ... 355
Operating Instructions, 11/2022, A5E41454666A
Preparing for use
4.10 Rotational speed limit values
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