Electrical installation
92
Note: Moisture inside the motor casing will reduce the insulation resistance. If
moisture is suspected, dry the motor and repeat the measurement.
Braking resistor assembly
Check the insulation of the braking resistor assembly (if present) as follows:
1. Check that the resistor cable is connected to the resistor, and disconnected from
the drive output terminals R+ and R-.
2. At the drive end, connect the R+ and R- conductors of the resistor cable together.
Measure the insulation resistance between the combined conductors and the PE
conductor by using a measuring voltage of 1 kV DC. The insulation resistance
must be higher than 1 Mohm.
Checking the compatibility with IT (ungrounded) and corner grounded TN
systems
EMC filter +E202 is not suitable for use in an IT (ungrounded) system. If the drive is
equipped with EMC filter +E202, disconnect the filter before connecting the drive to
the supply network. For detailed instructions on how to do this, please contact your
local ABB representative.
WARNING! If a drive with EMC filter +E202 is installed on an IT system (an
ungrounded power system or a high resistance-grounded [over 30 ohm] power
system), the system will be connected to earth potential through the EMC filter
capacitors of the drive. This may cause danger, or damage the unit.
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