ABB ACS 600 Series, Hardware Manual

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Safety Instructions
vi ACx = ACS/ACC/ACP ACS/ACC/ACP 604/607 AC Drives
Motor Connections
WARNING! Operation is not allowed if the motor nominal voltage is
less than one half of (ACP: 0.4 times) the ACx 600 nominal input
voltage, or the motor nominal current is less than 1/6 of the ACx 600
nominal output current.
WARNING! Do not make any voltage tolerance or insulation resistance
test (Hi Pot or Megger) on any part of the ACx 600. Disconnect motor
wires before making any tests of the motor or the cables between the
drive and motor.
Motor Insulation
Requirements
As with all AC drives employing the most modern IGBT invertor
technology, the output waveform of the ACx 600 consists of a series of
rectangular voltage pulses. Regardless of the output frequency, the
voltage of the pulses is approximately 1.35 times the input line voltage
with a very short rise time.
The voltage of the pulses can be almost double at the motor terminals,
depending on the properties of the cable between the drive and the
motor. This in turn can cause additional stress to the motor insulation.
The motor manufacturer should be consulted regarding the
characteristics of the motor insulation system. Failure of the motor to
fulfill the following requirements may shorten its life.