46 Electrical installation
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
at 25 °C or 77 °F). For the insulation resistance of other
motors, please 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.
Checking the compatibility with IT (ungrounded) and
corner-grounded TN systems
WARNING!
Disconnect the internal EMC filter when installing the drive on an
IT system (an ungrounded power system or a high-resistance-grounded [over
30 ohms] power system), otherwise the system is connected to ground potential
through the EMC filter capacitors. This may cause danger or damage the drive.
Disconnect the internal EMC filter when installing the drive on a corner-grounded TN
system, otherwise the drive will be damaged.
Note:
When the internal EMC filter is disconnected, the drive is not EMC compatible.
1. If you have an IT (ungrounded) or corner-grounded TN system, disconnect the
internal EMC filter by removing the EMC screw. For 3-phase U-type drives (with
type designation ACS310-03U-), the EMC screw is already removed at the factory
and replaced by a plastic one.
ohm
U1
3~
M
V1
W1
PE
Note:
In frame size R4
the EMC screw is located
to the right of terminal W2.
1
EMC
VAR
Aotewell Ltd
www.aotewell.com
Industry Automation
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