PAYLOAD METER ON BOARD WEIGHING SYSTEM (OBWS) GENERAL INFORMATION suspension and inclinometer data. After traveling 160 m (0.10 mi.) from the loading site, the PLM ΙΙ uses the data sampled under the shovel to calculate final payload. The Payload Meter ΙΙ ( PLM ) On Board Weighing System displays and records the payload weight along with other operating information. The system consists of a payload meter, pressure sensors, deck mounted lights and an inclinometer. The PLM ΙΙ displays payload on its display when the truck is stopped. For the first 160 m (0.10 mi.) after loading, the payload meter displays distance from the loading site.
At all other times when the truck is moving, the display shows the time of day. The payload meter (Figure 20-1) uses the four suspen- sion pressures and an inclinometer to determine the load in the truck. The payload weight can be displayed in short tons or metric tons. The payload meter stores in memory various operating data. This data includes: Haul Cycles payload, time, distance, and travel speed for each cycle The beginning of a new haul cycle starts at the dump, when the body comes down from dumping the last load.
date and time that the engine was started and stopped At the loading site, the PLM ΙΙ begins to calculate the size of each shovel pass (swingload) once the payload is greater than 10% of rated load for the truck. There are three external deck-mounted lights on each side of the truck. The lights indicate payload weight divided into three separate stages. A forecast feature will flash a deck mounted light predicting the payload weight if the next bucket of material is dropped into the body. date and time of each fault that occurred or was canceled total payload and the overall number of cycles for a specific time period This data is retained even when the power is switched off.
The stored data is backed up by an internal battery. At the moment the wheels begin to turn after loading under the shovel, the PLM ΙΙ takes one sample of The data can be down loaded from the payload meter to a personal computer when a communication cable is connected to the port inside the cab. FIGURE 20-1. PAYLOAD METER II 1. Display panel 7. Total/shift switch [TOTAL] [SFT] 2. Reception pilot lamp (Rx busy) 8. Light/increment switch [LIGHT] [INC] 3. Transmission pilot lamp (Tx busy) 9. Memory card 4. Memory card access lamp (CARD busy) 10. Cover 5. Mode switch [MODE] 11. Diagnostic/Download Port M20-4 Payload Meter II M20007.1 03/02