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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 motor 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 motor 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, motors 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 note the data on the blocked speed ranges specified in the Electrical
Data.
• The blocked speed ranges must be run through rapidly.
Motor damage due to excessively high speeds
Excessive rotational speed can lead to serious damage to the motor. This can result in death,
serious injury or material damage.
• Avoid operation above the permissible speed by using the appropriate control function.
• Observe the speeds stamped on the rating plate and in the Electrical Data.
4.11
System-inherent frequencies
Excessively high vibration levels and system resonances can damage the machine set.
• Configure and match the system consisting of the foundation and machine set in such a
way that no system resonances can arise and result in the permissible vibration levels
being exceeded.
• The vibration values according to DIN ISO 10816-3 must not be exceeded.
1LE7 shaft heights 71 ... 315
Operating Instructions, 04/2022, A5E51689275A-AA
4.9 Voltage and frequency fluctuations during line operation
Preparing for use
37
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