96 Electrical installation
Note: If the outer surface of the shield is non-conductive:
• Cut the shield at the midpoint of the bare part. Be careful not to cut the conductors or
the grounding wire (if present).
• Turn the shield inside out to expose its conductive surface.
• Cover the turned shield and the stripped cable with copper foil to keep the shielding
continuous.
Connecting the cables to the I/O terminals
Connect the conductors to the appropriate detachable terminals of the RMIO board (see
pages 92 and 93). At the terminal block, use shrink tubing or insulating tape to contain any
stray strands. The shield (especially in case of multiple shields) can also be terminated
with a lug and fastened with a screw at nearest grounding clamp. Leave the other end of
the shield unconnected or ground it indirectly via a few nanofarads high-frequency
capacitor, eg, 3.3 nF / 630 V. The shield can also be grounded directly at both ends if they
are in the same ground line with no significant voltage drop between the end
points.Tighten the screws to secure the connection.
Note: Keep any signal wire pairs twisted as close to the terminals as possible. Twisting the
wire with its return wire reduces disturbances caused by inductive coupling.
Connecting a PC
For connecting a PC to the inverter during the start-up procedure, see chapter Start-up.
For normal use, connect the PC through a fiber optic link to CH3 of the RDCO module
inserted in the master control unit (A43).
Installing optional modules
Mechanical installation
Optional modules such as fieldbus adapters and I/O extensions are inserted in the optional
module slot on the RDCU control unit at the factory. The module is fastened with a screw.
See page 52 for the available slots.
Note: Correct installation of the screw is essential for fulfilling the EMC requirements and
for proper operation of the module.
Wiring the modules
See the appropriate optional module manual for specific installation and wiring
instructions.
a) Cable shield
b) Grounding wire
c) Shielded twisted pair
d) Copper foil
a
b
c
d
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