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Commissioning, operation and maintenance
13.14
Operation with third-party controllers
Rate of rise of voltage
Bosch Rexroth AG R911298798_Edition 08
The insulation system of the motor is subject to a higher dielectric load in
converter mode than when it is operated with a merely sinusoidal source volt‐
age. The voltage load of the winding insulation in converter mode is mainly
defined by the following factors:
●
Crest value of voltage
●
Rise time of pulses at the motor terminals
●
Switching frequency of final converter stage
●
Length of power cable to the motor
Main components are the switching times of the final converter stage and the
length of the power cable to the motor. The rates of rise of the voltage occur‐
ring at the motor may not exceed the pulse voltage limits specified in
DIN VDE 0530-25 (VDE 0530-25):2009-08 (picture 14, limit curve A), meas‐
ured at the motor terminals of two strands in relation to the rise time.
The final stages of IndraDrive converters keep this limits.
MBT High Synchronous Torque Motors
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