2. Installation and Wiring
12
Serial bus cable spare cable wiring
Since the serial bus is dual (standard), 2 serial bus cables are used, for the phase A and the phase
B. Have spare cables on hand so that if a cable is damaged (for example if a wire is cut) in an
accident, it can be repaired immediately. Protect the snap-fit terminals at both ends of the spare
cables with for example oilskin so that they will not corrode, causing bad contact.
Wiring inside cabinet
Do not bundle the serial bus cable together with, for example, the power cable; keep them as far
apart as possible. For the distance that the wires should be kept apart, see Table 2.2 of the next
section on "Separation of wires".
As a rule, the serial bus cable should be wired within a single cabinet or 2 adjacent cabinet. If the
wiring must unavoidably extend outside of a cabinet, a special metal duct must be installed to
protect the wires from cable and external noise (to protect the cable from external noise). Keep
the total cable wiring length within 30 m.
For the distance which wires must be kept apart when a metal duct with or without cover is used,
see Table 2.3 in the next section "Wiring separation".
The duct should be installed as follows.
(1) Use pull boxes at locations where cables are connected or ducts of different diameter are
coupled. The duct length between pull boxes should be kept to not more than 20 m.
However, this may be increased to 25 m if the ducts are linear and in coplanar.
(2) Along one such segment a duct should not bend in more than 3 places, and the sum of the
bending angles should not exceed 180 .
(3) The metal ducts must be grounded (100 or less).
Separation between wires
Keep the serial bus cable at least 2 m from the power line and devices that generate electric and
magnetic fields. If this is difficult, then at least maintain the distances given in Table 2.2, based
on the actual voltage and current of the actual induction source.
Keep the voltage and current of the induction source to not more than 440 V and 100 A,
respectively.
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