86 Electrical installation
Connecting the control cables
WARNING! Obey the inverter safety instructions. If you ignore them, injury or
death, or damage to the equipment can occur. If you are not a qualified
electrician, do not do installation or maintenance work.
WARNING! Do the steps in section Electrical safety precautions on page 12
before you start the work.
Ground the cabinet lead-through for the control cables:
Make sure that there is a good seal after the installation.
1. Cut holes of sufficient size in the rubber grommets in the lead-through plate.
2. Put the cables through the grommets into the cabinet.
3. Strip the plastic sheath of the cable above the lead-through plate just enough to
ensure a good connection of the bare shield.
Note: If the outer surface of the shield is non-conductive:
• Cut the shield at the midpoint of the bare part. Do not cut the conductors or the
grounding wire (if it is present).
• Turn the shield inside out to expose its conductive surface.
• Cover the turned shield and the stripped cable with copper foil to make the
shielding continuous.
Note: The control cable gland plate is supplied only with IEC devices (wth or
without option H357). The conduit assembly is customized in the field according
to the actual cabling. The cable conduits that are used must provide the same
degree of protection as the inverter and the installation must be done so that the
base and cabling section fulfill this requirement.
Connecting the cables to the I/O terminals
Connect the conductors to the appropriate terminals of the I/O section. At the terminal
block, use shrink tubing or insulating tape to contain any stray strands. Especially for
multiple shields, you can also terminate the shield with a lug and fasten it with a screw to
the nearest grounding clamp. Leave the other end of the shield unconnected or ground it
indirectly through a high-frequency capacitor, for example, 3.3 nF/630 V. You can also
ground the shield 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 the signal wire pairs twisted as close to the terminals as possible.
Twisting the wire with its return wire reduces disturbances caused by inductive
coupling.
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