46
Installing the drive
ACH550-01 User's Manual
Checking the insulation of the assembly
Drive
Do not make any voltage tolerance 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.
Supply cable
Check the insulation of the supply (input) 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 phase
conductors and 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, please consult 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.
ohm
M
3~
U1
V1
W1
PE
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