Electrical Safety Precautions; General Notes; Static Electricity - ABB ACS880-104 Hardware Manual

146 Electrical installation

Electrical safety precautions

WARNING! Perform the electrical safety precautions before starting any work on
the installation. Ignoring the precautions can cause physical injury or death, or
damage to the equipment. Only a qualified electrician is allowed to work on the
installation.
1. Clearly identify the work location.
2. Disconnect all possible voltage sources.
•
Open the main disconnecting device of the drive system.
•
Open the disconnector of the supply transformer as the main disconnecting device
of the drive does not remove the voltage from the input busbars of the drive.
•
Make sure that reconnection is not possible. Lock the disconnectors to open
position and attach a warning notice to them.
•
Disconnect any external power sources from the control circuits before you do
work on the control cables.
•
After you disconnect the drive, always wait for 5 minutes to let the intermediate
circuit capacitors discharge before you continue.
3. Protect any 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.
•
Use a multimeter with an impedance of at least 1 Mohm.
•
Make sure that the voltage between the drive input power terminals and the
grounding (PE) busbar is close to 0 V.
•
Make sure that the voltage between the drive DC busbars (+ and –) and the
grounding (PE) busbar is close to 0 V.
6. Install temporary grounding as required by the local regulations. Close the grounding
switch if present, or connect the AC and DC busbars to PE with a temporary
grounding tool.
7. Ask for a permit to work from the person in control of the electrical installation work.

General notes

Static electricity

WARNING! Circuit boards contain components sensitive to electrostatic
discharge (ESD). Wear a grounding wrist band when handling the boards. Do not
touch the boards unnecessarily.