ABB ACS550-01 User Manual page 23

ACS550-01/U1 User's Manual
Disconnecting the internal EMC filter
On certain types of systems, you must disconnect the internal EMC filter, otherwise
the system will be connected to ground potential through the EMC filter capacitors,
which might cause danger, or damage the drive.
Note: When the internal EMC filter is disconnected, the drive is not EMC compatible.
The following table shows the installation rules for the EMC filter screws in order to
connect or disconnect the filter, depending on the system type and the frame size.
For more information on the different system types, see
Corner grounded TN systems
The locations of screws EM1 and EM3 are shown in the diagram on page 21. The
locations of screws F1 and F2 are shown in the diagram on page 22.
Frame
sizes
R1...R3
R5...R6
x = Install the screw. (EMC filter will be connected.)
= Replace the screw with the provided polyamide screw. (EMC filter will be disconnected.)
– = Remove the screw. (EMC filter will be disconnected.)
1
ACS550-U1 drives are shipped with screw EM3 already removed.
Symmetrically
Screw grounded TN systems
(TN-S systems)
EM1
1
EM3
EM1
R4
1
EM3
F1
F2
on page 279.
Corner grounded
TN systems
x x
x
x x
x –
x x
x x
IT systems on page 280
IT systems (ungrounded
or high-resistance-
grounded [> 30 ohm])
–
–
–
–
Installation
23
and