4.3 Decoupling Motor Modules
To
limit
possible
circulating currents between each Motor Module of the parallel connection and
the asynchronous motor, a minimum inductance per converter output is required.
You can achieve the minimum inductance in 2 different ways:
● Adherence to the minimum cable lengths between the Motor Modules connected in parallel
and the asynchronous motor
- OR -
● Adherence to the minimum cable lengths with the additional use of motor reactors at the
output of each Motor Module
Note
Same motor cable lengths
The minimum cable lengths must be the same length within the setup.
Minimum cable lengths without motor reactors
When the length
of the motor cable is specified in the table, it is assumed that 1 m of motor cable
typically has an inductance of 1 µH.
Table 4-1 Inductance - Minimum cable length
Description 6SL3120-1TE31-3AA3 6SL3120-1TE32-0AA4
Power [kW] 71 107
Rated current [A] 132 200
Required inductance per Motor Module [µH] 40 26
Motor cable lengths
Minimum cable length [m] per line/without
motor reactor
40 26
Hardware
4.3 Decoupling Motor Modules
Motor Modules Booksize parallel connection
30 Application Manual, 01/2020, 6SL3097-5BF00-0BP0
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