5.4.8 Parallel Connection of Motors
The Adjustable frequency drive can control several parallel-
connected motors. The total current consumption of the
motors must not exceed the rated output current I
INV
for
the Adjustable frequency drive.
When motors are connected in parallel,
1-29 Automatic
Motor Adaptation (AMA)
cannot be used.
Problems may arise at start and at low RPM values if motor
sizes are widely different because small motors' relatively
high ohmic resistance in the stator calls for a higher
voltage at start and at low RPM values.
The electronic thermal relay (ETR) of the Adjustable
frequency drive cannot be used as motor protection for
the individual motor of systems with parallel-connected
motors. Provide further motor protection with, for
example, thermistors in each motor or individual thermal
relays (circuit breakers are not a suitable means of
protection).
LC filter
130BA170.10
Figure 5.32
How to Install
VLT
®
HVAC Drive Design Guide
5-30
MG11BB22 - VLT
®
is a registered Danfoss trademark
5
5
Содержание VLT HVAC Drive FC 100 Series
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