Measuring The Insulation; Measuring The Insulation Of The Drive System; Measuring The Insulation Of The Input Cable; Measuring The Insulation Of The Motor And Motor Cable - ABB ACQ580-34 Hardware Manual

60 Electrical installation

Measuring the insulation

￭

Measuring the insulation of the drive system

WARNING!
Do not do any voltage withstand or insulation resistance tests 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.
￭

Measuring the insulation of the input cable

Before you connect the input power cable to the drive, measure its insulation according to
local regulations.
￭

Measuring the insulation of the motor and motor cable

WARNING!
Obey the safety instructions of the drive. If you ignore them, injury or death, or
damage to the equipment can occur.
If you are not a qualified electrician, do not do installation or maintenance work.
1. Stop the drive and do the steps in section
you start the work.
2. Make sure that the motor cable is disconnected from the drive output terminals.
3. Measure the insulation resistance between the between each phase conductor and the
protective earth conductor. Use a measuring voltage of 1000 V DC. The insulation
resistance of an ABB motor must exceed 100 Mohm (reference value at 25 °C [77 °F]).
For the insulation resistance of other motors, consult the manufacturer's instructions.
Note: Moisture inside the motor casing reduces the insulation resistance. If moisture
is suspected, dry the motor and repeat the measurement.
1000 V DC,
ohm
> 100 Mohm
Compatibility with IT (ungrounded), corner-grounded delta,
midpoint-grounded delta, and TT systems
￭

EMC filter and ground-to-phase varistor

A drive with EMC filter and ground-to-phase varistor connected can be installed to a
symmetrically grounded TN-S system. If you install the drive to another system, you may
need to disconnect the varistor. See sections
•
When to disconnect EMC filter and ground-to-phase varistor: TN-S, IT, corner-grounded
delta, and midpoint-grounded delta systems (page 61)
Electrical safety precautions (page 16)
U1
U1-PE, V1-PE, W1-PE
M
V1
3~
W1
PE
before