R6…R9 Quick installation guide 45
Check the insulation of the power cables and the motor
Check the insulation of the input cable according to local regulations before connecting it
to the drive.
See figure B on page 75.
1. Check the insulation of the motor cable and motor before connecting it to the drive.
Measure the insulation resistance between each phase conductor and then
between each phase conductor and the Protective Earth conductor using a
measuring voltage of 1000 V DC. The insulation resistance of an ABB motor must
exceed 100 Mohm (reference value at 25 °C or 77 °F). For the insulation resistance
of other motors, see the manufacturer’s instructions.
Note: Moisture inside the motor casing will reduce the insulation resistance. If moisture
is suspected, dry the motor and repeat the measurement.
Check the compatibility with IT (ungrounded) and corner-
grounded TN systems
EMC filter
The internal EMC filter is not suitable for use on an IT (ungrounded) system or on a
corner-grounded TN system. Disconnect the EMC filter before connecting the drive to
the supply network. Check the table on page 46.
WARNING! Do not install the drive with the internal EMC filter connected on an
IT system (an ungrounded power system or a high-resistance-grounded [over
30 ohms] power system), otherwise the system will be connected to ground potential
through the EMC filter capacitors of the drive. This can cause danger, or damage the
drive.
Do not install the drive with the internal EMC filter connected on a corner-grounded TN
system, otherwise the drive will be damaged.
Note: When the internal EMC filter is disconnected, the drive EMC compatibility is
considerably reduced.
Ground-to-phase varistor
The ground-to-phase varistor is not suitable for use on an IT (ungrounded) system.
Disconnect the ground-to-phase varistor before connecting the drive to the supply
network. Check the table on page 46.
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