BENDIX ET-S Podręcznik - Strona 5

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DIODES

IDLE

VALIDATION

SWITCH

PEDAL

POSITION

SENSOR

FIGURE 8 - ELECTRICAL TEST SCHEMATIC FOR THE CUMMINS CONNECTOR

Test 1: Where the set resistance and voltage is

shown on a label. The Cummins potentiometer on

™

the ET-S

and ET-S2

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. Loosely screw the

potentiometer in place but do not tighten. 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. The drive slot in the

potentiometer should engage with the drive tang at the

end of the drive shaft. Next rotate the potentiometer

TEST

LOAD

470

OHM

PIN 6

OHM

PIN 2

PIN 1

PIN 5

PIN 3

.01µ F

PIN 4

TEST LOAD

47000 OHM

™

treadle has an integral idle

Closed Throttle (open) Range: 5-17%

SUPPLY

Open Throttle (full) Range: 70-81%

VOLTAGE

V3 (LOGIC HIGH AT IDLE)

V2 (LOGIC LOW AT IDLE)

IVS GROUND

APS GROUND

SUPPLY

VOLTAGE

(OUTPUT)

APS

GROUND

(OUTPUT) SIG1

until the hole in the metal sleeve matches the mounting

holes on the actuator base. Loosely screw the

potentiometer in place but do not tighten. Construct the

test circuit following the circuit diagram shown in Figure

8. To make the test circuit connect the test load resistor

(47,000 Ohms) and a capacitor (.01 MicroFarads) across

pins 3 and 4 of the potentiometer. Then connect a

voltmeter to the lead ends of the test circuit. Next connect

a 5 volt power supply to the potentiometer at pin 4 (APS

ground) and pin 5 (supply voltage). Caution: Sensor

may be damaged if supply exceeds 5 volts. Now the

installer should read the set voltage value marked on

the potentiometer. Rotate the potentiometer until the

voltmeter reads the same voltage as shown on the

potentiometer within ±.02 volts. Next 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 3: Perform the following Operational Test before

installing the electronic treadle:

OPERATIONAL TEST

[Note for Cummins potentiometers only: The optimum

output & switch points should be achieved when the idle

voltage equals the set voltage or set resistance written on

the potentiometer. Use the test circuit shown in Figure 8.]

a. Check that the electronic treadle mounting plate is

securely attached to a smooth, flat surface in such a

way that does not twist the unit.

LOCK TAB

(INPUT)

IVS GROUND

(IVS) V 2

POTENTIOMETER

SET VOLTAGE

AND PC. NO.

SHOWN

HERE

(IVS)

V 3

LOCK TAB