ABB ACS380 Series, Hardware Manual

Page: 63 / 186

Electrical installation 63
Compatibility with IT (ungrounded) and corner-grounded
TN systems

EMC filter
WARNING! Do not use the internal EMC filter of the drive in an IT system (an
ungrounded power system or a high-resistance-grounded [over 30 ohms]
power system). If you use the internal EMC filter, the system is connected to the
ground potential through the EMC filter capacitors. This can cause danger or damage
to the drive.
WARNING! Do not use the internal EMC filter of the drive in a corner-grounded
TN system. If you use the internal EMC filter, this can cause damage to the
drive.
When the internal EMC filter is disconnected, the EMC compatibility of the drive
decreases. Refer to
Motor cable length on page 107 .

EMC filter disconnection
This is applicable only to product
variants with an internal EMC filter
(EMC C2 and C3 variants). Variants
with a C4 rating do not have an
internal EMC filter.
Refer to Hardware overview on page
28 .
To disconnect the EMC filter, remove
the EMC filter grounding screw. In
some product variants, the EMC
circuit is disconnected from electrical
ground at the factory with a non-
conducting (plastic) screw. The EMC
filter is disconnected on drives with a
plastic screw in the EMC filter
location. To connect the filter, remove
the plastic screw and insert the metal
screw and washer from the hardware
bag shipped with the drive.