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4 Update notice
The line-to-ground voltages in relation to the line-to-line voltage of the electrical power
system types are shown below.
U
U
L-L
L1-G
X
0.58·X
X
1.0·X
X
0.5·X
X
Varying level
versus time
Disconnection instructions
Precautions before electrical work
These warnings 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 electrician, do not do electrical
installation or maintenance work. Go through these steps before you begin any
installation or maintenance work.
1. Clearly identify the work location.
2. Disconnect all possible voltage sources.
•
Open the main disconnector at the power supply of the drive.
•
Make sure that reconnection is not possible. Lock the disconnector to open
position and attach a warning notice to the disconnector.
•
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 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.
•
Use a multimeter with an impedance of at least 1 Mohm.
•
Make sure that the voltage between the drive input power terminals (L1, L2, L3)
and the grounding terminal (PE) is close to 0 V.
•
Make sure that the voltage between the drive DC terminals (UDC+ and UDC-) and
the grounding terminal (PE) is close to 0 V.
6. Install temporary grounding as required by the local regulations.
7. Ask for a permit to work from the person in control of the electrical installation work.
U
U
L2-G
L3-G
0.58·X
0.58·X
1.0·X
0
0.5·X
0.57·X
Varying level
Varying level
versus time
versus time
Electrical power system type
Symmetrically grounded TN system (TN-
S system)
Corner-grounded delta system
(nonsymmetrical)
Midpoint-grounded delta system
(nonsymmetrical)
IT systems (ungrounded or high-
resistance-grounded [>30 ohms])
nonsymmetrical
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