Woodward ProAct I, Product Manual

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ProAct I/II Manual 04121
24 Woodward
Electrical Connections
External wiring connections and shielding requirements for a typical control
installation are shown in the wiring diagram. The wiring connections are
explained in the rest of this chapter.
Shielded Wiring
All shielded cable must be twisted conductor pairs. Do not attempt to tin the
braided shield. All signal lines should be shielded to prevent picking up stray
signals from adjacent equipment. Connect the shields to the nearest chassis
ground. Wire exposed beyond the shield should be as short as possible, not
exceeding 50 mm (2 inches). The other end of the shields must be left open and
insulated from any other conductor. DO NOT run shielded signal wires along with
other wires carrying large currents. See Woodward manual 50532,
EMI Control
for Electronic Governing Systems , for more information.
Where shielded cable is required, cut the cable to the desired length and prepare
the cable as instructed below.
1.
Strip outer insulation from BOTH ENDS, exposing the braided or spiral
wrapped shield. DO NOT CUT THE SHIELD.
2. Using a sharp, pointed tool, carefully spread the strands of the shield.
3. Pull the inner conductor(s) out of the shield. If the shield is the braided type,
twist it to prevent fraying.
4. Remove 6 mm (1/4 inch) of insulation from the inner conductors.
The shield must be considered as a separate circuit when wiring the system. The
shield must be carried through connectors without interruption.
Installations with severe electromagnetic interference (EMI) may require
additional shielding precautions. Contact Woodward for more information.
Failure to provide shielding can produce future conditions which are difficult to
diagnose. Proper shielding at the time of installation is required to assure
satisfactory operation of the speed control system.
Figure 3-4. Preparing Shielded Wiring
Power Supply
The power supply output must be low impedance (for example, directly from
batteries).