Motor Connections; Cable Length; Multiple Motors - Control Techniques Unidrive LV Series Installation Manual

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
components from entering the motor cable.
Sinusoidal filters are available from specialist filter
suppliers.
Chain connection (preferred)
Figure A–1 Connecting motors in parallel
Unidrive LV model sizes 1 to 3 Installation Guide
Issue code: uliu1
A.2
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
switching
PWM
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

Multiple motors

Star connection
Inductor
Motor connections A-1