Electrical Installation; What This Chapter Contains; Checking The Insulation Of The Assembly; Drive - ABB ACS150 series User Manual

Electrical installation

What this chapter contains

The chapter tells how to check the insulation of the assembly and the compatibility
with IT (ungrounded) and corner-grounded TN systems as well as connect power
cables and control cables.
WARNING! The work described in this chapter may only be carried out by a qualified
electrician. Follow the instructions in chapter
instructions can cause injury or death.
Make sure that the drive is disconnected from the input power during
installation. If the drive is already connected to the input power, wait for 5
minutes after disconnecting the input power.

Checking the insulation of the assembly

Drive

Do not make any voltage tolerance or insulation resistance tests (for example, hi-pot
or megger) on any part of the drive as testing can damage the drive. Every drive has
been tested for insulation between the main circuit and the chassis at the factory.
Also, there are voltage-limiting circuits inside the drive which cut down the testing
voltage automatically.

Input power cable

Check the insulation of the input power cable according to local regulations before
connecting to the drive.

Motor and motor cable

Check the insulation of the motor and motor cable as follows:
1. Check that the motor cable is connected to the motor and disconnected from the
drive output terminals U2, V2 and W2.
2. Measure the insulation resistance between each phase conductor and the
Protective Earth conductor using a measuring voltage of 500 V DC. The
insulation resistance of an ABB motor must exceed 100 Mohm (reference value
U1
at 25 °C or 77 °F). For the insulation resistance of other motors, please consult
M
V1
3~ the manufacturer's instructions. Note: Moisture inside the motor casing reduces
ohm
W1
PE
the insulation resistance. If moisture is suspected, dry the motor and repeat the
measurement.
Safety on page 11. Ignoring the safety
Electrical installation
39