Rotational Speed Limit Values; System-Inherent Frequencies; Electromagnetic Compatibility - Siemens SIMOTICS XP 1MB155 Operating Instructions Manual

4.11

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 note the data on the blocked speed ranges specified in the Electrical
Data.
● The blocked speed ranges must be run through rapidly.
Machine damage due to excessively high speeds
Excessive rotational speed can lead to serious damage to the machine. 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.
4.12

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 limit values according to DIN ISO 10816-3 must not be exceeded.
4.13

Electromagnetic compatibility

Note
If the torque levels are very unequal (e.g. when a reciprocating compressor is being driven),
a non-sinusoidal machine current will be induced whose harmonics can have an
impermissible effect on the supply system and cause impermissible interference emissions
as a result.
1MB155 / 1MB555
Operating Instructions, 03/2018, A5E41926185A
Preparations for use
4.11 Rotational speed limit values
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