ABB +Q957 Manuale d'uso - Pagina 9

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Electrical safety precautions

These electrical safety precautions are for all personnel who do work on the drive, motor

cable or motor.

WARNING!

Obey these instructions. If you ignore them, injury or death, or damage to the

equipment can occur.

If you are not a qualified electrical professional, do not do installation or

maintenance work.

Go through these steps before you begin any installation or maintenance work.

1. Clearly identify the work location and equipment.

2. Disconnect all possible voltage sources. Make sure that re-connection is not possible.

Lock out and tag out.

• Open the main disconnecting device of the drive.

• If you have a permanent magnet motor connected to the drive, disconnect the motor

from the drive with a safety switch or by other means.

• Disconnect all dangerous external voltages from the control circuits.

• After you disconnect power from the drive, always wait 5 minutes to let the intermediate

circuit capacitors discharge before you continue.

3. Protect any other energized parts in the work location against contact.

4. Take special precautions when close to bare conductors.

5. Measure that the installation is de-energized.

• Before and after measuring the installation, verify the operation of the voltage tester

on a known voltage source.

• Make sure that the voltage between the drive input power terminals (L1, L2, L3) and

the grounding (PE) busbar is zero.

• Make sure that the voltage between the drive output terminals (T1/U, T2/V, T3/W)

and the grounding (PE) busbar is zero.

• Make sure that the voltage between the drive DC terminals (UDC+ and UDC-) and

the grounding (PE) terminal is zero. In cabinet-built drives, measure between the drive

DC busbars (+ and -) and the grounding (PE) busbar.

6. Install temporary grounding as required by the local regulations.

7. Ask the person in control of the electrical installation work for a permit to work.

Safety instructions 9