76 Electrical installation
Ground-to-phase varistor
The ground-to-phase varistor is not suitable for use on an IT (ungrounded) system.
Disconnect the ground-to-phase varistor before connecting the drive to the supply
network. Check the table below.
WARNING!
Do not install the drive with the ground-to-phase varistor
connected on an IT system (an ungrounded power system or a high-
resistance-grounded [over 30 ohms] power system), otherwise the varistor circuit can
be damaged.
Check from the table below if you have to disconnect the EMC filter (EMC) or ground-
to-phase varistor (VAR). For instructions on how to do this, see sections
on page
on page
Frame
sizes
EMC
filter
EMC
screws
Ground-
to-phase
varistor
VAR
screws
Symmetrically
grounded TN
systems (TN-S
systems)
1
Corner grounded
TN systems
2
IT systems
(ungrounded or
high-resistance
grounded [>30
ohms])
3
R0…R3
1 × EMC
-
Do not disconnect
Disconnect
Disconnect
-
1 × VAR Do not disconnect Do not disconnect
Disconnect
R5…R9
2 × EMC
-
Do not disconnect
Disconnect
Disconnect
-
1 × VAR Do not disconnect Do not disconnect
Disconnect
1
2
3
Drive
PE
N
L3
L2
L1
Drive
Drive
PE
L3
L2
L1
L3
L2
L1
Содержание ACS580-01 drives
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Страница 72: ...72 Planning the electrical installation...
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Страница 196: ...196 Resistor braking...
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