ACS 300 User’s Manual 17
Chapter 3 - Power Connections
Insulation Checks
Warning! Do not make any voltage tolerance tests (Hi Pot
or Meggar) on any part of the ACS 300. Disconnect motor
wires from the ACS 300 before making any such tests on
the motor or motor wiring. Failure to follow these instructions
can result in permanent damage to the ACS 300.
Grounding and
Ground Faults
The ACS 300 must always be grounded through an ground-
ing conductor connected to the ground terminal, PE. The
grounding conductor should be the same wire size as the
input power wires. Metallic conduit is not suitable for use as
a grounding conductor.
WARNING! Make sure that the drive is securely grounded
before applying power. If the drive is not properly grounded,
a dangerous voltage level can develop between the
conductive parts of the drive housing and ground due to
high leakage current.
The ACS 300 ground fault protection guards only the AC
drive itself against ground faults occurring in the motor or
the motor wiring. It is NOT designed to protect personnel if
they come in contact with the motor wiring.
Ground fault protective devices do not necessarily operate
properly with AC drives. Normally occurring high frequency
ground leakage currents can cause nuisance tripping. When
using such devices, check their performance while the drive
is operating during commissioning.
The ACS 300 should be connected only to a grounded
power system. If the power system is ungrounded or
grounded through a high resistance, please contact ABB for
assistance.
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