Komatsu 830E-AC Shop Manual page 457

LOAD TESTING
Preparation
1. Ensure that the wheels are chocked and the
directional control lever is in PARK.
2. Ensure that all blower motor and alternator
brushes are installed correctly.
3. Install locks on the contactor box door and left
side compartment door of the control cabinet. The
right side compartment will be accessed.
4. Use the DID panel to cutout both inverters:
a. Press F4 - MENU > F3 - Inv Cutout >
F1 - Inv #1 > F4 - Toggle.
The display will show "Inverter #1 = cut-out".
b. Press F5 - Return > F2 - Inv #2 > F4 - Toggle.
The display will show "Inverter #2 = cut-out".
c. Press F5 - Return > F5 - Return to return to the
main DID panel display.
5. Turn the rest switch ON.
6. Move GF cutout switch (2, Figure 3-1) to the
CUTOUT (down) position.
7. Ensure that circuit breakers CB1 and CB2 on both
gate driver power converters are closed.
8. Reconnect the 21B wires to the starter solenoids.
Alternator Speed Sensor Checks
1. Connect an AC voltmeter to circuits 74X (TB22)
and 74Z (TB22).
2. Ensure that the GF cutout switch is in the
CUTOUT (down) position and the rest switch is
ON.
3. Start the engine and operate at low idle.
Verify approximately 4VAC on the meter.
Verify that the tachometer in the operator cab
reads approximately 700 RPM.
4. Remove the voltmeter.
5. Ensure engine speed control by varying the
position of the accelerator pedal.
6. To check the PSC alternator speed feedback,
connect the serial communication cable from the
PTU to the PSC port (DIAG1) on the DID panel
located on the back wall of the operator cab.
7. Make sure that the directional control lever is in
PARK and the rest switch is in the REST position.
8. Turn control power switch (1, Figure 3-1) and the
key switch ON.
E03018 10/06
Battery Boost Check
The battery boost check must be performed exactly
as described in the following procedure. Failure to
do so may result in serious injury.
The contactors in the control cabinet with the R1
resistor may be energized while the engine is
running. DANGEROUS VOLTAGES ARE PRESENT
INSIDE THE CONTROL CABINET.
NOTE: The engine must be OFF during initial setup.
AC Drive System Electrical Checkout Procedure
(Release 21 Software)
Click START > Programs > GEOHVPTU_2.0 >
AC TOOLS > wPTU AC v21.01
Select "Normal" mode {enter}
Type password "ok75e" {enter}
Under "Real Time", double-click "PSC Real Time
Data".
Verify that ENGSPD in the "Analog" field shows
the correct alternator speed value.
9. Leave the PTU connected to the PSC port for
further checks. Use the emergency stop switch on
the center console of the operator cab to stop the
engine.
1. Turn the rest switch ON.
2. Move GF cutout switch (2, Figure 3-1) to the
CUTOUT (down) position.
3. Verify that all link voltage lights are OFF.
4. Connect a voltmeter across resistor R1 located in
the right side compartment of the control cabinet.
a. Connect the positive lead to BAT
b. Connect the negative lead to F101.
5. Start the engine.
6. Move the GF cutout switch to the NORMAL (up)
position.
7. Turn the rest switch OFF.
The voltmeter will momentarily show a reading
of approximately 18VAC, then drop to zero.
8. Turn the rest switch ON.
10. Move the GF cutout switch to the CUTOUT
(down) position.
11. Use the emergency stop switch on the center
console of the operator cab to stop the engine.
12. Verify that all link voltage lights are OFF. Remove
the voltmeter.
E3-27