User manual BENDIX ET-S SUSPENDED ELECTRON TREADLE

[. . . ] This condition is also referred to as "Closed Throttle. " In this state, the potentiometer returns the minimum percentage of supply voltage to the engine control unit (see Figure 2). As the driver depresses the treadle, the electronic treadle output voltage increases (see Figure 3). The potentiometer allows an increased amount of its supply voltage to return to the engine control unit, which in turn increases the engine's speed. In the full, or "Open Throttle" position, the driver has depressed the treadle to its furthest possible point. [. . . ] Use suitable solvent to clean all metal parts (note that mineral spirits may damage the paint finish). Inspect the treadle and mounting plate for severe corrosion, pitting, or cracks. Inspect the cable assembly for loose or frayed wires, physical damage, or any contaminants on the connectors. Replace as necessary. potentiometer clockwise until the first set of mounting holes align. (b) For Caterpillar Position Sensor: Aligning the drive slot, the position sensor engages the drive tang at the end of the drive shaft (see Figure 4). Rotate the position sensor clockwise until the first set of mounting holes align. (a) For Detroit Diesel Potentiometers: Align the drive slot, and engage the potentiometer the drive tang at the end of the drive shaft (see Figure 4). Rotate the DIGITAL VOLT/ OHM METER POWER SUPPLY (9-16 VDC) PIN C GROUND PIN B VOUT (OUTPUT) POTENTIOMETER PC. ON THIS SURFACE 300, 000 OHM RESISTOR TEST LOAD POTENTIOMETER Closed Throttle (open) Range: 7-18% Open Throttle (full) Range: 74-84% PIN A VREF (INPUT) FIGURE 6 - ELECTRICAL TEST SCHEMATIC FOR THE DETROIT DIESEL CONNECTOR Closed Throttle (open) Range: 10-20% Open Throttle (full) Range: 75-90% PIN A VREF (INPUT) 2000 OHM ±5% RESISTOR PEDAL POSITION SENSOR (PWM) . 001µF PIN B VOUT (OUTPUT) (CABLE) 47, 000 OHM ±5% RESISTOR PIN C GROUND Caterpillar output voltage is Pulse Width Modulated POSITION SENSOR FIGURE 7 - ELECTRICAL TEST SCHEMATIC FOR THE CATERPILLAR CONNECTOR 4 Closed Throttle (open) Range: 5-17% DIODES TEST LOAD 470 OHM TEST LOAD 470 OHM Vs SUPPLY VOLTAGE Open Throttle (full) Range: 70-81% LOCK TAB V3 (LOGIC HIGH AT IDLE) V2 (LOGIC LOW AT IDLE) IVS GROUND POTENTIOMETER SET VOLTAGE AND PC. SHOWN HERE PIN 6 IDLE VALIDATION SWITCH IVS PIN 2 PIN 1 PIN 5 PEDAL POSITION SENSOR PIN 3 PIN 4 TEST LOAD 47000 OHM . 01µ F Vs SUPPLY VOLTAGE V1 (OUTPUT) APS GROUND 4 APS GROUND 5 VS (INPUT) 6 (IVS) V3 LOCK TAB 3 V1 (OUTPUT) SIG1 1 IVS GROUND 2 (IVS) V 2 FIGURE 8 - ELECTRICAL TEST SCHEMATIC FOR THE CUMMINS CONNECTOR (c) For Cummins Potentiometers: Test 1: Where the set resistance and voltage is shown on a label. The Cummins potentiometer on the ET-STM and ET-S2TM treadle has an integral idle validation switch. It also has a set resistance value marked on the cover, which needs to be used to properly install the potentiometer. The drive slot in the potentiometer should engage with the drive tang at the end of the drive shaft. Next rotate the potentiometer until the hole in the metal sleeve matches the mounting holes on the actuator base. Connect an ohmmeter to pins 3 (APS output) and 4 (APS ground) as shown in Figure 8. Now the installer should read the set resistance value marked on the label. Rotate the potentiometer until the ohmmeter reads the same resistance as shown on the label within ±10 Ohms. Next, while holding the potentiometer at the set resistance screw and lock the potentiometer in place (torque to 25 inch pounds ±5). The sleeves lock into the body of the potentiometer for easy removal and reassembly. Test 2: Where the potentiometer has no label, but has engraved set voltage shown. The Cummins potentiometer on the electronic treadle has an integral idle validation switch. It also has a set voltage value marked on the cover, which needs to be used to properly install the potentiometer. [. . . ] If the work is being performed on the vehicle's air brake system, or any auxiliary pressurized air systems, make certain to drain the air pressure from all reservoirs before beginning ANY work on the vehicle. If the vehicle is equipped with an AD-ISTM air dryer system or a dryer reservoir module, be sure to drain the purge reservoir. Following the vehicle manufacturer's recommended procedures, deactivate the electrical system in a manner that safely removes all electrical power from the vehicle. Never connect or disconnect a hose or line containing pressure; it may whip. [. . . ]