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periodically occurring commutation voltage peaks (threshold value for
terminals and winding insulation):
1. Terminals have effective clearance and creepage distances to withstand a
voltage of 750V based on DIN EN50019 - increased safety type "e". The
maximum transient over voltage from the frequency inverter to the motor is
2.15 kV (phase to phase and phase to earth).
2. Standing winding for 230/400V and 500V can withstand a peak voltage of
1.6 kV (phase to phase and phase to earth) with winding temperature rise
corresponding to class F, our standard windings can be used with frequency
inverters without the need for additional filter.
3. Standing winding for 400/690V can withstand a peak voltage of 1.6 kV
(phase to phase and phase to earth) with winding temperature rise
corresponding to class F, our standard windings can be used with frequency
inverters with additional filter.
4. Special winding for a single nominal voltage of 690V can withstand a
peak voltage of 2.15 kV (phase to phase and phase to earth) with winding
temperature rise corresponding to class F, this windings can be used with
frequency inverters without the need for additional filter. These motors will
be marked with an āUā in the type code on the rating plate.
In the case of a converter output non-galvanically separated from the mains
and with current limitation, follow the requirements of DIN EN 50178 and
VDE 0160 (equipment of high voltage installations with electronic devices) on
the overload protection of the protective earth conductor.
In rating the protective device in the outer conductors, bear in mind that the
protective earth conductor current can be greater than the outer conductor
current in fault condition. The protective earth conductor is to be dimensioned
according to this fault current.
Take note of all of the data of the converter manufacturer for said fault
condition.
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