Komatsu 830E-AC Shop Manual page 322

VHMS DIAGNOSTIC FEATURES
The VHMS system provides several basic data items
that are useful for troubleshooting failures in the
VHMS system itself.
Fault History
The Fault History recorded in the VHMS controller
can help identify failures within the VHMS system
and in the communications network to the engine
controllers, interface module, or PLM III. For a com-
plete listing of all the error codes, refer to the VHMS
Troubleshooting and Checkout Procedures in this
section.
VHMS LED Digits
The VHMS controller indicates some system errors
or communication errors on two red LED digits (2,
Figure 11-6) on the controller. Error codes are
flashed as a two-part sequence. If no errors are
occurring, the VHMS LED's count from 00 - 99 con-
tinuously at a rate of 10 numbers per second. For a
complete listing of all the error codes, refer to the
VHMS Troubleshooting and Checkout Procedures in
this section.
The VHMS controller also has two red LED lights (10
and 11, Figure 11-6).
Light (10) PLM III communication
• OFF - no communication with the PLM III
controller
• ON - is communication with the PLM III controller
Light (11) OrbComm
• OFF - no communication with OrbComm
controller
• ON - communication with OrbComm controller
• FLASHING - satellite in view
D11-14
VHMS CONTROLLER
The VHMS controller collects and stores signals from
sensors and data from other controllers. It also gives
commands for transmitting the accumulated data
through the communications system. The controller
operates on 20VDC - 30VDC.
FIGURE 11-6. VHMS CONTROLLER
1. VHMS Controller
2. LED Digit Display
3. Connector CN3B
4. Connector CN3A
5. Connector CN4B
6. Connector CN4A
VHMS COMPONENTS
7. Connector CN1
8. Connector CN2A
9. Connector CN2B
10. PLM III Light
11. OrbComm Light
D11005