Parker AC890PX Series, Engineering Reference

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5-20
C h a p t e r 5 : O p e r a t i n g t h e D r i v e
AC890PX AC Drive
Using Multiple Motors on a Single Drive
A single large drive can be used to supply several smaller motors provided that
each individual motor has overload protection.
NOTE
Conventional V/F control strategy must be enabled for use with parallel
motors. (Sensorless vector control strategy cannot be used). See the
VECTOR ENABLE parameter under VECTOR SET-UP menu at level 2.
The drive must be rated to supply the total motor current . It is not sufficient
to simply sum the power ratings of the motors, since the drive has also to
supply the magnetising current for each motor.
Note that the overload device will not prevent the motor overheating due to
inadequate cooling at low speed. Force vented motors may be required; consult
your motor supplier.
Figure 3.14
Single Drives supplying Multiple Motors
WARNING
All motors should be connected to the drive output before the
START
command is given.
Caution
Restrict the total cable length on multiple motor installations as follows:
50 metres with no output choke fitted, 300 metres with choke.
M1 M2
VSD
OL1 OL2
M1/U M2/V
M3/W