10
Input RFI Filters
2.
The RFI filter must be connected between the incoming AC
supply line and the drive input terminals.
Important:
The filter may cause ground leakage currents.
Therefore a solid ground connection must be provided
as shown below.
Remove the filter access panel (or terminal block cover) to expose
the input terminal block. Connect the incoming AC lines (see
note 1) to the appropriate terminals on the block ("Line/L1, L2,
L3"). Replace access panel/cover.
Incoming AC lines are connected to 1336-RFB-475, 590, 670
filters at the lower set of filter bus bars.
1
Input power (source to filter) wiring must be in conduit or have shielding/armor with equivalent
attenuation.
Filter Wiring - 1336 PLUS/
PLUS
II,
FORCE & IMPACT
3.
Connect remaining wires. Cables must use knockouts as defined
on page 14.
4.
To assure that the RFI filter is effective and to reduce cable
radiation, all cables entering and/or exiting the filter/drive must
be shielded or armored. The ground conductor of the motor cable
(drive end) must be connected directly to the drive ground
terminal, not to the enclosure bus bar. At the motor end, the
ground conductor should also be connected to the motor case
ground. The shield or armor should be bonded to the filter (and
drive). At the motor end, the shield should also be connected to
the motor case ground.
!
ATTENTION: To guard against possible equipment
damage, RFI filters can only be used with AC supplies that
are nominally balanced (and grounded) with respect to
ground. In some installations, three-phase supplies are
occasionally connected in a 3-wire configuration with one
phase grounded (Grounded Delta). The filter must not be
used in Grounded Delta supplies.
JOG
ESC
SEL
R (L1)
S (L2)
T (L3)
L1
Line
L2
L3
E
L1’
Load
L2’
L3’
E’
PE
Conduit/4-Wire Cable
RFI Filter
Shield Terminated in Cable
Clamp on A Frame Drives
Nearest
Building Structure Steel
E
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