Unidrive M / HS Frame 7 to 10 Power Installation Guide 69
Safety information Product information Mechanical installation
Electrical installation
Technical data UL listing information
4.8.4 Multiple motors
Open-loop only
If the drive is to control more than one motor, one of the fixed V/F modes should be selected
(Pr 05.014 = Fixed or Squared). Make the motor connections as shown in Figure 4-9 and Figure 4-
10. The maximum motor cable lengths specified in section 5.1.21 Maximum motor cable lengths on
page 111 apply to the sum of the total cable lengths from the drive to each motor.
It is recommended that each motor is connected through a protection relay since the drive cannot
protect each motor individually. For
connection, a sinusoidal filter or an output inductor must be
connected as shown in Figure 4-10, even when the cable lengths are less than the maximum
permissible. For high DC voltages or when supplied by a regen system, a sinusoidal filter is
recommended. For details of filter or inductor sizes refer to the supplier of the drive.
Figure 4-9 Preferred chain connection for multiple motors
Figure 4-10 Alternative connection for multiple motors
Motor protection
relay
Chain connection (preferred)
9E/10E
Star connection
Inductor
Motor
protection
relay
9E/10E
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