16 ACS 300 User’s Manual
Chapter 3 - Power Connections
Note! To avoid interfering with control signals, route the
control wiring away from the power wiring. Avoid long runs
of control wiring parallel with power wiring.
Input Power Wiring The ACS 300 is suitable for use on a circuit capable of deliv-
ering not more than 65,000 RMS symmetrical amperes at
240 or 480 volts maximum for the 200 - 240 volt or 380 - 480
volt models respectively.
Caution! The maximum permissible number of DC bus
chargings per minute is four. This has to be taken in
consideration when using an input power contactor.
Motor Wiring The ACS 300 provides solid-state motor overload protec-
tion. Motor thermal protection is activated using the TEMP
LIM parameter. If this feature is not used, the motor con-
nected to the ACS 300 requires overload protection in
accordance with the National Electric Code (U.S.A).
The rapid voltage changes cause capacitive current in the
motor cable. This current increases with the switching fre-
quency and motor cable length. This phenomenon can
cause substantially higher current measured by the
ACS 300 than the actual motor current, and can cause over-
current tripping. Do not exceed 300 ft. motor cable length.
The capacitive current can be reduced by installing an out-
put choke. If the motor cable length exceeds 300 ft., please
contact your local distributor or ABB office.
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