App. C Effect on Insulation of General-purpose Motors Driven with 460 V Class Inverters
A-19
App.
(1) Output reactor (2) Output filter
Figure C.3 Method to Suppress Surge Voltage
C.4 Regarding existing equipment
[ 1 ] In case of a motor being driven with 460 V class inverter
A survey over the last five years on motor insulation damage due to the surge voltages originating from
switching of inverter elements shows that the damage incidence is 0.013% under the surge voltage
condition of over 1,100 V and most of the damage occurs several months after commissioning the inverter.
Therefore there seems to be little probability of occurrence of motor insulation damage after a lapse of
several months of commissioning.
[ 2 ] In case of an existing motor driven using a newly installed 460 V class inverter
We recommend suppressing the surge voltages with the method of Section C.3.
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