TIPS FOR OPERATION EXTERNAL DISPLAY LIGHTS To assure the On Board Weighing System records the most accurate and consistent data, these important steps should be followed: The Payload Meter ΙΙ 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 20-2) * Always keep suspension oil and nitrogen properly charged. The most common failure for causing inaccurate payload data is due to improperly charged suspensions. Always follow shop man- ual procedures when charging a suspension. Re- fer to Section "H". It is crucial to maintain the proper oil and nitrogen levels at all times.
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: * For most Komatsu Trucks: Use only the brake lock switch to hold the truck stationary at the loading and dumping area. For Komatsu 330M/HD785 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. FIGURE 20-2.
LOAD INDICATOR LIGHTS * 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. 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: * Regularly remove “carryback” from the dump body. * Calibrate regularly. Refer to "Calibrating a Truck". * Do not focus on single payloads when viewing data from the payload meter. Use the average of sev- eral payloads to get a more accurate calculation of payload productivity. 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. M20-6 Payload Meter II M20007.1 03/02 INDICATOR LIGHTS PAYLOAD WEIGHT Off Off Green 50% and Greater Off Amber Green 90% and Greater RED Amber Green 105% and Greater