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Electrical installation 47
Checking the compatibility with IT (ungrounded) and
corner grounded TN systems
WARNING!
Disconnect the internal EMC filter when installing the drive on an
IT system (an ungrounded power system or a high resistance-grounded [over
30 ohms] power system), otherwise the system will be connected to ground potential
through the EMC filter capacitors. This may cause danger or damage the drive.
Disconnect the internal EMC filter when installing the drive on a corner-grounded TN
system, otherwise the drive will be damaged.
Note
: When the internal EMC filter is disconnected, the drive is not EMC compatible
without an external filter.
1. If you have an IT (ungrounded) or corner grounded TN system, disconnect the
internal EMC filter by removing the EMC screw. For 3-phase U-type drives (with
type designation ACS320-03U-), the EMC screw is already removed at the factory
and replaced by a plastic one.
Pay attention to the screws! Do not confuse the EMC screw to the similar varistor
disconnecting screw. Do not disconnect the varistor. The varistor protects the
drive against power line voltage peaks.
Note:
In frame size R4
the EMC screw is located
to the right of terminal W2.
1
EMC
VAR
1
EMC
Summary of Contents for ACS320 series
Page 1: ...ABB drives User s manual ACS320 drives 0 5 to 30 hp ...
Page 4: ......
Page 18: ...18 Safety ...
Page 28: ...28 Operation principle and hardware description ...
Page 56: ...56 Electrical installation ...
Page 142: ...142 Program features Connection diagram example ACS320 xx xxxx x ...
Page 282: ...282 Actual signals and parameters ...
Page 358: ...358 Fieldbus control ...
Page 376: ...376 Fault tracing ...
Page 382: ...382 Maintenance and hardware diagnostics ...
Page 407: ...Dimension drawings 407 Frame size R2 NEMA 1 Frame size R2 IP20 NEMA 1 3AUA0000051097 A ...
Page 409: ...Dimension drawings 409 Frame size R3 NEMA 1 Frame size R3 IP20 NEMA 1 3AUA0000051118 A ...
Page 411: ...Dimension drawings 411 Frame size R4 NEMA 1 Frame size R4 IP20 NEMA 1 3AUA0000051133 A ...
Page 412: ...412 Dimension drawings ...
Page 413: ...Index Numerics A B C D E F G H I K L M N O P R S T ...