ABB ACH550-UH-011A-6 User Manual page 50

ACH550-01 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
(earth) potential through the EMC filter capacitors, which might
cause danger, or damage the drive.
Note: Disconnecting the internal EMC filter increases the
conducted emission and reduces the drive EMC compatibility
considerably.
The following table shows the installation rules for the EMC filter
screws to connect or disconnect the filter, depending on the
system type and the frame size.
The locations of the screws EM1 and EM3 are shown in the
diagram on page 43. The location of the screws F1 and F2 are
shown in the diagram on page 44.
Frame
sizes Screw
EM1
R1...R3
EM3
EM1
R4
EM3
F1
R5...R6
F2
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.)
* In case of 30 mA RCD, it is recommended to remove the screws. With
300 mA RCD, consult your local ABB representative.
Installing the drive
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Symmetri-
cally Corner-
grounded grounded
TN systems TN
(TN-S systems
systems)
x
x
x
x
x
x
IT systems
(ungrounded
or high-
resistance-
grounded
[>30 ohms])
x
x
–
– –
x
–
x
–
Residual
current
circuit
breakers
(RCD)*
–
–
–
–
45