TIPS FOR OPERATION
To assure that the On Board Weighing System records
the most accurate and consistent data, these impor-
tant steps should be followed:
* For most Komatsu Trucks:
Use
only the Brake Lock
switch to hold the truck
stationary at the loading and dumping area.
For 330M Trucks
ONLY
:
Use the
Park Brake switch
to hold the truck
stationary at the loading and dumping area.
Any other method will not allow the payload sys-
tem to register properly.
* Do not activate the “Lamp Test” switch during
loading. Inaccurate and inconsistent data may be
stored.
* At the loading area
do not release
the Brake Lock
(or Park Brake switch)
until the loading is com-
plete
and the load shock from the last load
dumped has settled.
* The loading area surface
must be
maintained as
flat and level as possible. The On Board Weighing
System can compensate for slight variations in
grade and unevenness, but ruts, berms, rocks,
etc. will cause the system to record inaccurate
and inconsistent data.
* Regularly remove “carryback” from the dump body.
* Calibrate periodically.
EXTERNAL DISPLAY LIGHTS
The Payload Meter II controls three light relays. The
relays operate three deck mounted lights on each side
of the truck. There is one green light, one amber light,
and one red light. (Figure 20-3)
While the truck is stopped being loaded and the hoist
lever is in the float position, the appropriate lights will
remain on according to the following schedule:
The shovel or loader operator can predict the payload
weight by observing these lights. During the loading
operation, a forecast feature flashes a deck mounted
light predicting the payload weight after the next bucket
of material is loaded into the body.
The logic is as follows:
1. If the measured payload is varying 3% or less of
the rated load for more than 3 seconds, the
current load is deemed a steady value.
2. If the difference between the previous steady
value and the current steady value is greater than
15% of the rated load, the difference is taken to
be the size of the current bucket.
3. The average size of previous buckets is added to
the current load. One of the deck mounted lights
will turn on, if another “average” size load is put
in the body, and will blink at one second intervals.
FIGURE 20-2. LOAD INDICATOR LIGHTS
INDICATOR LIGHTS PAYLOAD WEIGHT
Off Off Green 50% and Greater
Off Amber Green 90% and Greater
RED Amber Green 105% and Greater
M20007 10/00 Payload Meter II M20-5
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