Load Testing; Preload Checks; Alternator Speed Sensor Check; Battery Boost Check - Komatsu 930E-2 Shop Manual

LOAD TESTING

1. Reconnect wires 21SR and 21SS (MTU 396
engine) to the starter or 21B (MTU/DDC 16V4000
or Komatsu engine) to the starter solenoids.
2. Place both Inverter Cutout Switches on the side
of the control cabinet to the CUTOUT position
(down).
3. Place the Rest Switch in the REST position.
4. Make sure the wheels are chocked, and the park
brake switch is ON.
5. Install locks on the three front doors of the electri-
cal cabinet. Also secure the 3 top covers.

PRELOAD CHECKS

Alternator Speed Sensor Check:

1. Connect an AC voltmeter to circuits 74X (TB22)
and 74Z (TB22).
2. Place the GF Cutout Switch in the CUTOUT
position (down).
3. With Rest Switch in the REST position, start the
engine and operate at low idle.
Verify approximately 4 VAC on the meter.
Verify tach (in cab) reads approximately 700
RPM.
4. Shut down the engine. Remove voltmeter.

Battery Boost Check:

THE BATTERY BOOST CHECK MUST BE PER-
FORMED EXACTLY AS DESCRIBED BELOW.
• • • • Failure to do so may result in serious in-
jury.
• • • • The contactors in the cabinet with the R1
resistor may be energized with the engine
running. DANGEROUS VOLTAGES ARE
PRESENT INSIDE THE CABINET.
• • • • Engine must be OFF during setup prepara-
tion.
• • • • Rest switch in the cab must be in REST.
• • • • GF cutout switch must be in the CUTOUT
position, (down).
• • • • ALL Link Voltage lights must be OFF.
E3-26 AC Drive System Electrical Checkout Procedure
(Release 17 Software)
1. Connect a voltmeter across resistor R1 located in
the Contactor Box on the Electrical Cabinet.
a. Connect the positive lead to BAT
b. Connect the negative lead to F101.
2. Close the cabinet door.
3. Turn Key Switch and Control Power Switch ON.
4. Connect one serial communication cable from the
PTU to the PSC port.
¤ C:\>ACNMENU {enter}
¤ Highlight "PTU TCI & PSC" {enter}
¤ Type your name {enter}
¤ Type your password {enter}
¤ Cursor to "Normal Operation" {enter}
¤ Cursor to "PSC Real Time Data" {enter}
5. Verify the analog values and the functions high-
lighted on the PTU are similar to Figure 3-6.
6. Connect a second serial communication cable
from the PTU to the TCI port.
¤ C:\>ACNMENU {enter}
¤ Highlight "PTU TCI & PSC" {enter}
¤ Type your name {enter}
¤ Type your password {enter}
¤ Cursor to "Normal Operation" {enter}
¤ Cursor to "TCI Real Time Data" {enter}
7. Verify the analog values and the functions high-
lighted on the PTU are similar to Figure 3-7.
8. Start the engine.
9. Place the GF Cutout Switch in the NORMAL
position (up).
10. While observing the voltmeter installed in step 1,
place the Rest Switch in the OFF position.
The voltmeter will momentarily show about
18 volts and then drop to zero
11. Place the Rest Switch in the ON position.
12. Place the GF Cutout Switch in the CUTOUT posi-
tion.
13. Shut down the engine.
14. Verify ALL lights indicating link voltage are
OFF.
15. Remove the voltmeter and lock the cabinet door.
3/01 E03015