Woodward DSLC, Инструкция по установке и эксплуатации, Страница: 19 / 114

Manual 02007 DSLC Digital Synchronizer and Load Control
Woodward 13
•
Connect the cable shields to chassis ground. Shields are grounded at the
control end only for inputs and at the speed control and voltage regulator
end for outputs.
•
Make sure that cable shields are carried through all intermediate terminal
blocks from signal source to signal termination.
•
Do not subject any wiring to temperatures above 100 °C (212 °F).
•
Avoid kinks or sharp bends in the wiring. Make sure that all connections are
tight.
For additional wiring information, see Woodward manual 25070,
Electronic
Control Installation Guide
.
Install and wire the other units and actuators in your system using instructions in
applicable manuals.
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. 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. See Woodward application note
50532,
Interference Control in 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 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.
5. Connect wiring and shield as shown in plant wiring diagram.
Installations with severe electromagnetic interference (EMI) may require
additional shielding precautions, such as wire run in conduit or double shielding.
Contact Woodward for more information.
Power Supply
The DSLC control requires a nominal voltage source of 18 to 40 Vdc, 18 W.
Power to the control should be maintained whenever the generator set is
available for service.
CAUTION—APPLY POWER
Power must be applied to the DSLC control at least 15 seconds prior to
expected use. The control must have time to do its power up diagnostics
and establish its location in the local area network to become operational.
Failure of the diagnostics will disable control function and de-energize
(activate) the alarm relay.