10 ACH550 Installation, Operation and Maintenance Manual
ACH550-UH
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 Floating networks on page
12 and Unsymmetrically grounded networks on page 11.
The locations of screws EM1 and EM3 are shown in the diagram on page 8. The
locations of screws F1 and F2 are shown in the diagram on page 9.
Frame
sizes
Screw
Symmetrically
grounded TN systems
(TN-S systems)
Corner grounded
TN systems
IT systems (ungrounded
or high-resistance-
grounded [> 30 ohm])
R1…R3
EM1 x x
EM3 x
R4
EM1 x x –
EM3 x ––
R5…R6
F1 x x –
F2 x x –
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.)
EM1 and EM3 screws are M4 x 12
F1 and F2 screws are M4 x 16
Ground Lug
Bar
ACH550
R7 (R8 Similar)
Motor
Terminals
Input Power
Terminals
Control Wires
(X1)
Terminal Strip
Only on
ACH550-UH
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