ABB RCNA-01 User Manual download pdf (Page 50)

100

101

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

(e.g. hi-pot or megger) 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 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 10 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

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ABB RCNA-01 User Manual Page 50

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