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On-Board Load Testing
Inspect and verify the front and side electrical
cabinet doors are closed and locked before per-
forming the following tests.
Preparation:
1. Jumper fan clutch control circuit to lock fan in full
on condition.
a. If truck is equipped with DDEC engine, jumper
circuit 541M @ TB24 to ground.
b. If truck is equipped with Komatsu engine,
jumper circuit 22FO @ TB32 to ground.
Note: With release 17 software installed, load testing
can be activated through the DID panel if desired.
2. Connect a VOM from circuit 72E @ TB24 (+) to
circuit 72R @ TB24 (-). This is the 10 volt load
hand-shaking signal from the engine. (Value
should be 5.0 volts with just control power on.)
Refer to "PVM Test" at the end of this section for
additional information.
3. Turn brake lock ON.
E3-30
FIGURE 3-8. PSC REAL TIME DATA SCREEN SAMPLE
AC Drive System Electrical Checkout Procedure
(Release 17 Software)
4. On the PSC PTU:
¤ Cursor to "Normal Operation" {enter}
¤ Cursor to "PSC Real Time Data" {enter}
5. With the engine running, place the Rest Switch in
the OFF position.
6. Verify the analog values and the functions high-
lighted on the PTU are similar to the screen
shown in Figure 3-8.
7. Place the Rest Switch in the REST position.
8. On the TCI PTU:
¤ Cursor to "Normal Operation" {enter}
¤ Cursor to "TCI Real Time data" {enter}
9. With the engine running, place the Rest Switch in
the OFF position.
10. Verify the analog values and the functions high-
lighted on the PTU are similar to the screen shown
in Figure 3-9.
3/01 E03015
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Troubleshooting
