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4.10 Voltage and frequency fluctuations during line operation
1LA5/6/7/9, 1LG4/6, 1MA6/7, 1MB..1/2/3/4/5 - SH 63 ... 355
Operating Instructions, 06/2018, A5E44455710A
45
Voltage and frequency fluctuations during line operation
Unless stated otherwise on the rating plate, the permissible voltage/frequency fluctuation is
corresponds to range 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.
Thermal protection (Page 43)
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.
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