Frequency Input Checks - Komatsu 830E Shop Manual

Hide thumbs Also See for 830E:

Table of Contents

3.3 Frequency Input Checks

For each of the frequency inputs listed below, perform the test procedure specified, and verify

the results on the MONITOR ANALOG INPUT CHANNELS screen as noted. Be sure to restore

any switch settings and wiring changes to their original condition before moving on to check the

next frequency input.

1. ENGINE SPEED . . . . . . . . . . . . . . . . . . . . . . . . .engine speed = 0.0 rpm

(Screen value rpm = 1.2 x input frequency)

a. Connect an oscillator to circuits 74X and 74Z at control cabinet terminal board. Increase

oscillator frequency until PTU reads 1900 ±10 rpm.

Verify tachometer in the cab reads 1900 ±10 rpm.

b. If necessary, adjust tachometer calibration pot (located under plug on rear of tach).

c. Remove oscillator.

2. ENGINE COMMAND . . . . . . . . . . . . . . . . . . engine command = 0.0 rpm

Applicable to "Fuel Saver" equipped trucks only. The value displayed is the engine RPM com-

mand controlled by the FL275 panel based on various truck operating condition inputs. (Input

cannot be tested.)

3. MOTOR 1 SPEED . . . . . . . . . . . . . . . . . . . . . . Motor 1: 0.0 rpm; 0.0 mph

(Screen value rpm = 1.0 x input frequency; 787, or 788 motors)

(Screen value rpm = 2.0 x input frequency; 772, 776 or 791 motors)

(Screen value mph = screen value rpm x conversion factor mph/rpm)

a. Connect an oscillator to circuits 77 and 77A at control cabinet terminal board.

b. Increase the oscillator frequency to obtain 3 MPH (5 KPH) value on the PTU screen.

Verify the cab speedometer reads 3 MPH (5 KPH)

c. Increase oscillator to obtain 25 MPH (40 KPH) value on the PTU screen.

Verify cab speedometer reads 25 ±2 MPH (40 ±3 KPH)

d. If necessary, adjust speedometer calibration pot (located under plug at rear of speedome-

e. Remove oscillator.

Statex III Electrical Checkout Procedure

Table of Contents