PISTON AS 2881394 - Caterpillar

Scope
This chapter contains general installation instructions for the 705 control. Power requirements, environmental precautions, and location considerations are included to help you determine the best location for the control. Additional information includes unpacking instructions, electrical connections, and installation checkout procedures.Unpacking
Before handling the control, read Chapter 3, Electrostatic Discharge Awareness. Be careful when unpacking the electronic control. Check the control for signs of damage such as bent panels, scratches, and loose or broken parts. If any damage is found, immediately notify the shipper.Power Requirements
The low-voltage 705 control requires a low-impedance voltage source of 20 to 40 Vdc at 8 watts. Apply and remove power to the control only through a non-bouncing switch.
To prevent damage to the control, do not exceed the input voltage range.
If a battery is used for operating power, an alternator or other battery-charging device is necessary to maintain a stable supply voltage.
To prevent damage to the control, make sure that the alternator or other battery-charging device is turned off or disconnected before disconnecting the battery from the control.
Location Considerations
Consider these requirements when selecting the mounting location: * adequate ventilation for cooling;* space for servicing and repair;* protection from direct exposure to water or to a condensation-prone environment;* protection from high-voltage or high-current devices, or devices which produce electromagnetic interference;* avoidance of vibration;* selection of a location that will provide an operating temperature range of -40°C (-40°F) to +70°C (+158°F).The control must NOT be mounted on the engine.Electrical Connections
External wiring connections and shielding requirements for a typical control installation are shown in the plant wiring diagram, Figure 4-1. The plant 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 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.Installations with severe electromagnetic interference (EMI) may require additional shielding precautions. Contact Woodward Governor Company for more information.Power Supply
Power supply output must be low impedance (for example, directly from batteries). DO NOT power low-voltage versions of the control from high-voltage sources with resistors and zener diodes in series with