Relay Output; Parallel Connection Of Motors - Danfoss FC 300 Design Manual

6. How to Install

6.5.5. Relay Output

Relay 1
•
•
•
Relay 2 (Not FC 301)
•
•
•
Relay 1 and relay 2 are programmed in par.
5-40, 5-41, and 5-42.
Additional relay outputs by using option mod-
6
ule MCB 105.

6.5.6. 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
adjustable frequency drive.
This is only recommended when U/f is selec-
ted in par. 1-01.
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.
132
Terminal 01: common
Terminal 02: normal open 240 V AC
Terminal 03: normal closed 240 V AC
Terminal 04: common
Terminal 05: normal open 400 V AC
Terminal 06: normal closed 240 V AC
INV
NOTE
Installation with cables connec-
ted in a common joint as in il-
lustration 1 is only recommen-
ded for short cable lengths.
NOTE
When motors are connected in
Automatic
parallel, par. 1-02
Motor Adaptation (AMA)
be used, and par. 1-01
Control Principle must be set to
Special motor characteristics
(U/f)
.
MG.33.B9.22 - VLT
for the
cannot
Motor
® is a registered Danfoss trademark.
FC 300 Design Guide