2 Engineering
2.5 Motor and Application
DC1 Frequency Inverter 10/12 MN04020003Z-EN www.eaton.com 39
Figure 12: Parallel connection of several motors to one frequency inverter
NOTICE
If multiple motors are connected in parallel to a single frequency
inverter, make sure to dimension the individual motors’ contac-
tors for utilization category AC-3.
The
motor contactor
must be
selected
according
to the
rated operational current of the motor
that will be connected.
￫
The current consumption of all motors connected in parallel
must not exceed the frequency inverter’s rated output current
I
2N
.
￫
When operating multiple motors in parallel, you cannot use the
frequency inverter’s electronic motor protection. You will have
to protect each motor individually with thermistors and/or a
current transformer-operated overload relay.
￫
The use of motor-protective circuit-breakers at the output of fre-
quency inverters can result in motors being disconnected in an
undefined manner and is only possible in select applications.
￫
When operating multiple single-phase AC motors in parallel
(only permissible with DC1-S… inverters), it is not permitted to
connect individual motors during operation!
Q11
F1
M1
Q12
F2
M2
Q13
F3
M3
U1 V1 W1 U1 V1 W1 U1 V1 W1
M
3
˜
M
3
˜
M
3
˜
①
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