Identifying The Grounding System Of The Electrical Power Network; Disconnecting Internal Emc Filter Or Ground-To-Phase Varistor - Frames R1 - ABB ACH580-01 Hardware Manual

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Identifying the grounding system of the electrical power network

WARNING!
Only a qualified electrical professional may do the work instructed in this section.
Depending on the installation site, the work may even be categorized as live
working. Continue only if you are an electrical professional certified for the work.
Obey the local regulations. If you ignore them, injury or death can occur.
To identify the grounding system, examine the supply transformer connection. See the
applicable electrical diagrams of the building. If that is not possible, measure these
voltages at the distribution board, and use the table to define the grounding system
type.
1. input voltage line to line (U
2. input voltage line 1 to ground (U
3. input voltage line 2 to ground (U
4. input voltage line 3 to ground (U
The table below shows the line-to-ground voltages in relation to the line-to-line voltage
for each grounding system.
U L-L U L1-G
X 0.58·X
X 1.0·X
X 0.866·X
Varying level
X
versus time
Varying level
X
versus time
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Disconnecting internal EMC filter or ground-to-phase varistor - frames
R1...R3
To disconnect the internal EMC filter or ground-to-phase varistor, if needed, do as
follows:
1. Switch off the power from the drive.
2. Open the front cover, if not already opened, see page 123.
3. To disconnect the internal EMC filter, remove the EMC screw (3a) and place it in
the storage place (3b).
)
L-L
)
L1-G
)
L2-G
).
L3-G
U L2-G U L3-G
0.58·X 0.58·X
1.0·X 0
0.5·X 0.5·X
Varying level Varying level
versus time versus time
Varying level Varying level
versus time versus time
Electrical installation – IEC 119
Electrical power system type
Symmetrically grounded TN system (TN-S
system)
Corner-grounded delta system (nonsymmet-
rical)
Midpoint-grounded delta system (nonsym-
metrical)
IT systems (ungrounded or high-resistance-
grounded [>30 ohms]) nonsymmetrical
TT system (the protective earth connection
for the consumer is provided by a local
earth electrode, and there is another inde-
pendently installed at the generator)