Retard Contactors Operation Check; Ground Fault Sensing Check; Ground Fault In Retard Operation Check - Komatsu 830E Shop Manual

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1.5 Retard Contactors Operation Check

1. Put Selector Switch in FORWARD and depress retard pedal.

2. Verify that the contactors pick up in the following sequence; RP1, RP2, MF, GF, and GFR then

RP3, RP4, RP5 (and RP6, RP7, RP8, and RP9 if used).

RP1 RP2 MF GF GFR RP3 RP4 RP5 RP6 RP7 RP8 RP9

a. Verify the feedback signals:

RP1 FB RP2FB MFFB GFFB GFRFB RP3FB RP4FB RP5FB

RP6FB RP7FB RP8FB RP9FB

3. MF, GF, and GFR must pick up after RP1 and RP2 but timing is very close. If installed, the

Dynamic Retard Light in the cab should illuminate.

4. Release retard pedal. Verify GF, GFR, and MF, RP3, RP4, RP5, (and RP6, RP7, RP8, and RP9

if used) drop out first, then after a one second delay RP1 and RP2 also drop out, and Dynamic

Retard Light (if installed) turns Off.

1. Place Selector Switch in FORWARD and depress throttle.

2. Propulsion contactors MF, P1/(P2), GF, and GFR should pick up.

AS MF P1 (P2) GF GFR

a. Verify feedback signals are present:

MFFB P1FB (P2FB) GFFB GFRFB

3. Momentarily jumper from circuit 71 to terminal "A" on GFIP.

4. All contactors should drop out immediately and remain open, and Electric System Fault light (in

cab) should illuminate and remain On, even after circuit 71 to terminal "A" jumper is removed.

Event code 01 should appear on two digit display.

5. An analog value indicating current flow to ground should appear on PTU screen under

6. Release throttle. Operate Override pushbutton on console to reset ground fault (Electric System

Fault) light. Press reset button on two digit display to clear event code.

1. Put Selector Switch in FORWARD and depress retard pedal.

a. Verify feedback signal is present:

2. Retard contactors RP1, RP2, MF, GF, and GFR, RP3-RP5, (and RP6-RP9 if used) should ener-

RP1 RP2 MF GF GFR RP3 RP4 RP5 RP6 RP7 RP8 RP9

Statex III Electrical Checkout Procedure

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