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VHMS BASIC FEATURES
The center of the VHMS system is the VHMS control-
ler which gathers data about the operation of the
truck from sensors and other controllers installed on
the truck. Refer to Figure 11-1 for an overview of the
VHMS system components.
For instructions on how to use VHMS software pro-
grams, refer to VHMS Software elsewhere in this
section. For error codes, check-out and troubleshoot-
ing procedures, refer to VHMS Troubleshooting and
Check-out Procedures elsewhere in this section.
Gather Data
The VHMS controller gathers data from three
sources. Real-time and alarm data from each con-
troller is gathered continually. In addition, haul cycle
summary data from the PLM III is requested by the
VHMS controller one time per day.
The VHMS system performs three primary functions:
1. Gathers data from on-board sources:
a. PLM III Controller
b. Interface Module (IM)
c. Engine Controllers
2. Converts data into usable formats and record
into permanent memory.
3. Communicates data to off-board systems:
a. Satellite (OrbComm)
b. Laptop Personal Computer (PC) Download
NOTE: The electric drive system does provide a
limited number of faults to the interface module.
Refer to VHMS Troubleshooting else where in this
section for a complete listing of fault codes generated
by the drive system.
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VHMS COMPONENTS
Convert and Record Data
VHMS controller (2, Figure 11-1) processes data
received from external controllers and stores the fol-
lowing data in internal memory:
1. Fault codes from the engine, Interface Module,
and PLM III
2. Snapshots of data when specific fault codes
occur
3. Trends of specific engine and chassis parame-
ters
4. Load map and other measures of engine and
chassis usage
5. Haul cycle summary information, including pay-
load, distance traveled, and travel times
In addition to data gathered from external controllers,
the VHMS records information about the vehicle and
VHMS usage, including:
6. Key ON and engine ON record
7. VHMS configuration changes.
FIGURE 11-1. VHMS SYSTEM COMPONENTS
1. Orbcomm Controller
2. VHMS Controller
3. Interface Module
VHMS COMPONENTS
4. Red LED Digits
5. Green LED Light
D11-3
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