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
8
9
10
11
A
B
C
D
1
2
3
4
5
6
7
E
Using Multiple Induction Motors on a Single Drive
A single large drive can be used to supply several smaller induction
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
