10.14 Operation on external controllers
Rate of rise of voltage
The isolation system of the motor underlies a higher dielectric load in convert‐
er operation than in a sinusoidal source voltage only. The voltage stress of
the winding isolation in converter operation is mainly defined by the following
factors:
●
Crest value of voltage
●
Rise time of impulse on the motor terminal
●
Switching frequency of converter output
●
Length of power cable to the motor
Main components are the switching times of converter output and the length
of the power cable to the motor. The occured rates of rise of voltage on the
motor may not exceed the specified limits from DIN VDE 0530-25 (VDE
0530-25):2009-08 (picture 14, limit curve A) of impulse voltage, measured on
the motor terminals of two strands in depencence of the rise time.
Outputs of IndraDrive converters keep this limits.
DOK-MOTOR*-MSK*EXGIIK3-PR09-EN-P
Bosch Rexroth AG
139/175
Synchronous Servomotors MSK For Potentially Explosive Areas
Operating conditions and application notes
