1.
Stop the drive and do the steps in section Electrical safety precautions (page 15)
before you start the work.
2. Remove the front cover(s) if not already removed.
3. For frame R3: Pull the control panel holder up.
4. Cut an adequate hole into the rubber grommet and slide the grommet onto the cable.
Slide the cable through a hole in the bottom plate and attach the grommet to the
hole.
5. Route the cable as shown in the figures below.
6. Ground the outer shield of the cable 360 degrees under the grounding clamp at the
cable entry. Keep the cable unstripped as close to the terminals of the control unit
as possible. Secure the cables inside the drive mechanically.
7. Frame R3: Ground the pair cable shields and grounding wires under the grounding
clamp screw at the cable entry.
Frame R6 and R8: Ground the pair cable shields and grounding wire under the
clamp screw below the control unit.
8. Connect the conductors to the appropriate terminals of the control unit and tighten
to 0.5 … 0.6 N·m. See Default I/O diagram of the drive control unit
(ZCU-1x) (page 131).
Note:
• Leave the other ends of the control cable shields unconnected or ground them
indirectly through a high-frequency capacitor with a few nanofarads, 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.
• 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.
Example wirings are shown below.
102 Electrical installation – IEC
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