Rockwell Automation 1336 8A-48A Fiber Industry - Manual (Page 16)

2–8 Installation/Wiring
Encoder & Communications Cabling
If encoder connections or communications cables are used, the wir-
ing must be separated from power cabling. This can be accomplished
with carefully routed, shielded cable (ground cable shield at the drive
end only) or a separate steel conduit (grounded at both ends). Belden
9730, 8777 (or equivalent) is recommended for encoder cable runs
less than 30 meters (100 feet). Belden 9773 (or equivalent) is recom-
mended for encoder cable runs greater than 30 meters (100 feet).
Discrete Control and Signal Wiring
The control and signal wiring must be grounded at a single point in
the system, remote from the drive. This means the 0V or ground
terminal should be grounded at the equipment end, not the drive end.
If shielded control and signal wires are used, the shield must also be
grounded at this point.
If the control and signal wires are short, and contained within a
cabinet which has no sensitive circuits, the use of shielded control
and signal wiring is not necessary. The recommended control signal
wire is:
•
Belden 8760 (or equiv.)–0.750 mm 2 (18 AWG), twisted pair, shielded.
•
Belden 8770 (or equiv.)–0.750 mm 2 (18 AWG), 3 conductor, shielded.
•
Belden 9460 (or equiv.)–0.750 mm 2 (18 AWG), twisted pair, shielded.
Shield Termination – TE (True Earth)
The TE terminal block (not available on 0.37-7.5 kW (0.5-10 HP) A
Frame drives) is used for all control signal shields internal to the
drive. It must be connected to an earth ground by a separate
continuous lead. Refer to Figure 2.1/2.3 for location.
The maximum and minimum wire size accepted by this block is 2.1
and 0.30 mm
2 (14 and 22 AWG). Maximum torque is 1.36 N-m
(12 lb.-in.). Use Copper wire Only.
Safety Ground – PE
This is the safety ground required by code. This point must be
connected to adjacent building steel (girder, joist) or a floor ground
rod, provided grounding points comply with NEC regulations. If a
cabinet ground bus is used, refer to Grounding on page 2–7.
RFI Filter
Important: Using an optional RFI filter may result in relatively
high ground leakage currents. Surge suppression
devices are also incorporated in the filter. Therefore, the
filter must be permanently installed and solidly
grounded to the supply neutral. Grounding must not
rely on flexible cables and should not include any form
of plug or socket that would permit inadvertent
disconnection. The integrity of this connection should
be periodically checked.