Unidrive
LV
model sizes 1 to 3 Installation Guide
Issue code: uliu1
Motor connections A-1
A Motor Connections
A.1 Cable length
It is not recommended that a Drive is operated with
a motor-cable length greater than that specified in
the table in Planning the installation in Chapter 2. If
this is unavoidable, it is recommended that a
sinusoidal filter is used to prevent the
PWM switching
components from entering the motor cable.
Sinusoidal filters are available from specialist filter
suppliers.
A.2 Multiple motors
Open-loop only
If the Drive is to control more than one motor, make
connections as shown in Figure A–1. The maximum
cable lengths given in the table in Chapter 2 Installing
the Drive apply to the total length of cable from the
Drive to the farthest motor.
It is recommended that each motor is connected
through a protection relay since the Drive cannot
protect each motor. For star connection, a
sinusoidal filter or an output inductor must be
connected as shown in Figure A–1, even when the
cable lengths are less than the maximum permissible.
For details, of inductor sizes refer to a Drive Centre
or distributor listed at the end of the User Guide.
Motor protection
relay
Chain connection (preferred) Star connection
Inductor
Figure A–1 Connecting motors in parallel
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