In some conventional installations and many MRL applications, the motor
can be a considerable distance (greater than 40 feet) from the elevator drive.
Under these circumstances, the long cable length can cause high voltage
peaks or high dV/dt (rate of voltage rise) on the motor windings. Depending
on the design of the motor, the long runs can cause damage to the motor
winding. Therefore, in these installations, the use of a special dV/dt lter is
highly recommended.
The standard approved solution is a special output choke. The choke is designed
to be used with a maximum of 16kHz switching frequency and low inductance,
so it does not drastically inuence the motor’s equivalent circuit model.
There are three sizes available for motors rated up to 100A. All chokes are rated
for use up to 550VAC. The part numbers and current ratings are listed below.
Part Number Rated Current
15Z1F04-1005 22A
17Z1F04-1005 42A
21Z1F04-1005 100A
The use of a conventional line or motor choke on the output of the drive is not
recommended since the inductance value is high enough that it would distort
the values in the motor model and result in poor motor control. In addition,
these chokes may not be designed to handle the heating incurred from 16kHz
switching operation.
2.2.7 Motor Cable
Length
Technical Information
15
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