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7.4.2 Parallel Connection of Motors
The adjustable frequency drive can control several motors connected in parallel. When using parallel motor connection,
observe the following points:
•
Run applications with parallel motors in U/F mode (volts per hertz).
•
VCC
plus
mode may be used in some applications.
•
Total current consumption of motors must not exceed the rated output current I
INV
for the adjustable frequency
drive.
•
Problems may arise at start and at low RPM if motor sizes are widely different because the small motors’ relatively
high ohmic resistance in the stator demands a higher voltage at start and at low RPM.
•
The electronic thermal relay (ETR) of the adjustable frequency drive cannot be used as motor protection. Provide
further motor protection by including thermistors in each motor winding or individual thermal relays.
•
When motors are connected in parallel,
1-02 Flux Motor Feedback Source
cannot be used, and
1-01 Motor Control
Principle
must be set to
Special motor characteristics (U/f)
.
Electrical Installation
Design Guide
220
Danfoss A/S © Rev. 2014-02-10 All rights reserved.
MG34S222
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Содержание VLT AutomationDrive FC 300
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