SHIM 1987841 - Caterpillar

Shielded Wiring
* Use shielded wires for the signal lines to prevent interference from other electrical equipment (see Figure 2-1).* Prepare the shielded wires as shown in Figure 2-1.* Connect the shield to the nearest chassis ground, leaving the opposite end of the shield open. Ensure that the shield is properly insulated (see Figure 2-2).* Do not install shielded wires directly next to high-current wires.
Figure 2-1. Preparing Shielded Wiring
Figure 2-2. Shielded Wiring ConnectionCable Length Requirements
Electrical Connections
See the wiring diagram (Figure 2-9) for complete details of electrical connections to the TecJet 50.For detailed information concerning the different signal inputs (Analog, PWM, Dual PWM (DPWM), CAN, CAN & PWM, EGS, and C29), see the Description of the TecJet 50 Menus section in Chapter 3.Power Supply Requirements
The input power supply to the TecJet 50 is rated at 18 to 32 Vdc, 24 Vdc nominal. It is protected from reverse voltage connections and up to +80 V on its input. The following internal voltages are generated:* +5 Vdc 5% @ 400 mA max. non-isolated* +13 V 10% @ +40 mA non-isolated* -13 V unregulated @ -3 mA non-isolatedSee Figures 2-3 and 2-4 for details on correct power supply wiring for the TecJet 50.
CAUTIONDo not power other devices with leads common to the TecJet 50, and avoid long wire lengths.
CAUTIONThe TecJet 50 must be fused. Failure to fuse the TecJet 50 could, under exceptional circumstances, lead to personal injury, damage to the control valve and/or explosion.
Figure 2-3. Correct Wiring to Power Supply Power must provide transient protection (see Electromagnetic Compatibility earlier in this chapter.
Figure 2-4. Incorrect Wiring to Power Supply
CAUTIONA negative ground system is shown. If a positive ground system is used, the switch and control fuse must be located in series with the battery (-) and the terminal on the Woodward control. The positive terminal becomes chassis ground.
If the TecJet 50 is installed in combination with an EGS-01 engine control, the TecJet 50 will take the power supply from the EGS-01 engine control.Termination Resistor for CAN Communication
If CAN communication is used between the TecJet 50 and the engine control system, a termination resistor of 120 W between pin B and pin S must be installed on the TecJet 50 (see Figure 2-5). The termination resistor on the TecJet 50 connector will prevent disturbances and/or reflections of CAN signals.If your application consists of multiple TecJet 50's, then pins B and S of the first TecJet 50 should be connected to pins N and V of the second TecJet 50. Connect the termination resistor between pins B and S of the second TecJet 50 (see Figures 2-6 and 2-9) for further details. The termination resistor must always be connected through pins B and S of the last TecJet 50 in an application using multiple TecJet 50's. See Figure 2-6 for further details.
Figure 2-5. Single TecJet 50
Figure 2-6. Multiple TecJet 50's
Figure 2-7. TecJet 50 Connector*See Figure 2-9 for further details on CANDID harness coding.