Komatsu 830E-AC Shop Manual page 840

PAYLOAD OPERATION & CALCULATION
Description of Haul Cycle States
The typical haul cycle can be broken down into eight
distinct stages or states. Each state requires the pay-
load meter to make different calculations and store
different data.
"States" or stages of a typical haul cycle
1. Tare Zone
2. Empty
3. Loading
4. Maneuvering
5. Final Zone
6. Hauling
7. Dumping
8. After Dump
Haul Cycle Description
A new haul cycle is started after the load has been
dumped from the previous cycle. The payload meter
will stay in the after_dump state for 10 seconds to
confirm that the load has actually been dumped. If
the current payload is less than 20% of rated load,
the payload meter will switch to the tare_zone and
begin calculating a new empty tare. If, after dumping,
the payload has not dropped below 20% of rated
load the meter will return to the maneuvering or haul-
ing states. In this case, the false_body_up flag will be
recorded in the haul cycle record.
While in the tare_zone state, and moving faster than
5 km/h (3 mph), the payload meter calculates the
empty sprung weight of the truck. This tare value will
be subtracted from the loaded sprung weight to cal-
culate the final payload. The payload meter will
switch from the tare_zone or empty to the loading
state if swingloads are detected. By raising the dump
body while in the empty state the payload meter can
be manually switched back to the tare_zone to calcu-
late a new tare.
From the empty state, the payload meter will switch
to the loading state through one of two means. If the
brake lock is applied, the payload meter will be ana-
lyzing the suspension pressures to detect a swing-
load. If a swingload is detected, the meter will switch
to the loading state. The minimum size for swingload
detection is 10% of rated load. Swingload detection
usually takes 4-6 seconds. The second method to
switch from empty to loading is through continuous
loading. This can happen if the brake lock is not used
during loading. If the load increases above 50% of
M20-12
rated load for 10 seconds without the brake lock
applied, the meter will switch to loading and record
the continuous_loading flag in the haul cycle.
The payload meter switches from loading to maneu-
vering as soon as the truck begins moving. The
maneuvering zone is 160m and is designed to allow
the operator to reposition the truck under the shovel.
More payload can be added anytime within the
maneuvering zone. Once the truck travels 160m (0.1
miles) the payload meter switches to the final_zone
and begins calculating payload. If the body is raised
while the payload meter is in the maneuvering state,
the no_final_load flag will be recorded in the haul
cycle record, no payload will be calculated, and the
meter will switch to the dumping state.
While in the final_zone moving faster than 5 km/h (3
mph), the payload meter calculates the loaded
sprung weight of the truck. The same advanced algo-
rithm is used to calculate the empty and loaded
sprung weights. The payload meter will switch from
the final_zone to the dumping state if the Body-Up
signal is received. If the truck has moved for less
than 1 minute in the final_zone, the payload meter
will calculate the final payload using an averaging
technique which may be less accurate. If this hap-
pens, the average_load flag will be recorded in the
haul cycle.
The payload meter switches to the dumping state
when the dump body rises. The payload meter will
switch from dumping to after_dump when the dump
body comes back down.
From the after_dump, the payload meter will switch
to one of three states:
1. If the average payload is greater than 20% of
rated load and no final payload has been calcu-
lated, the payload meter will return to the
maneuvering state. After the truck travels 160m
(0.1 mile) the meter will switch to the final_zone
and attempt to calculate the payload again. The
false_body_up flag will be recorded in the haul
cycle record.
2. If the average payload is greater than 20% of
rated load and the final payload has been calcu-
lated, the payload meter will switch back to the
hauling state. The false_body_up flag will be
recorded in the haul cycle record.
3. If the average payload is less than 20% of rated
load, the payload meter will switch to the
tare_zone and begin to calculate a new empty
tare.
Payload Meter III 02/05 M20008