Operating the Drive
890CS Common Bus Supply - Frames B & D; 890CD Common Bus Drive and 890SD Standalone Drive - Frames B, C & D Page 7-21
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C
D
1
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E
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 7.14 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
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