Chapter 3 - Electrical Installation; Insulation Checks - ABB ACS 601 Hardware Manual

Insulation Checks

ACS/ACC/ACP 601 Drives
Chapter 3 – Electrical Installation
WARNING! The electrical installation described in this chapter should
only be carried out by a qualified electrician. The Safety Instructions on
the first pages of this manual must be followed. Negligence of these
instructions can cause injury or death.
Note: The information presented in this chapter is primarily directed
towards the North American market. For IEC installations, refer
to Appendix C for additional information. For installations
requiring CE compliance, refer also to the section entitled CE
Marking in Appendix A.
Before connecting the motor to the drive, check the insulation of the
motor and the cable between the drive and the motor.
WARNING! Do not make any voltage tolerance or insulation resistance
test (Hi Pot or Megger) on any part of the ACx 600.
A test (2500V rms, 50 Hz, 1 second) has been performed at the factory
on every ACx 600 drive to verify the integrity of the insulation between
the power circuitry and the chassis. To avoid damaging sensitive
circuitry, this test is performed using a special procedure that can not
easily be performed outside the factory.
Use the following procedure to check the insulation of the motor and
the cable between the drive and the motor.
1. Disconnect all sources of power from the drive and motor.
WARNING! Before proceeding with the insulation checks, make sure
that the motor is disconnected from all sources of power including the
drive and any bypass circuitry.
2 Check that the motor cable is disconnected from the ACx 601
output terminals U2, V2, and W2.
3 Check that the motor cable is disconnected from the motor and
remove bridging connections at the motor.
4. Measure the insulation resistances of the motor between the
phases and between each phase and Ground (PE). The voltage
range of the resistance meter must be at least equal to the line
voltage, but not higher than 1000V. The insulation resistance must
ACx=ACS/ACC/ACP 3-1