Payload Meter II - Section 60 OM6010 Page 60-8 NOTE: This screen is the only place that the value of the G t gain potentiometer can be checked. Viewing Payload Calculation Inputs The PLM II™ estimates payload by monitoring sus- pension pressures when the truck is loaded and compares them to truck empty pressure values. The PLM II™ uses one empty truck weight for all payload calculations. This empty truck weight is called the 'tare weight'. It is not the empty vehicle weight (EVW). It is an estimate of the empty weight of all the truck components suspended above the suspen- sions. The process of making the PLM II™ calculate the tare weight is called the calibration procedure.
There are two gain factors that can be applied to the payload measurement. The first is the G t gain factor and the other is the UP gain factor. They are not applied uniformly to all payload calculations. Example Calculation of Payload These calculations used a 13" front suspension diameter and 10" rear suspension diameter. This calibration weight is used as item #13 from the manual calculation procedure in Figure 60-4. 1. Press and hold the LIGHT/INC and MODE switches until "CHEC" is flashing on the display. Sprung Weight= Suspension Diameter 2 (psi Left + psi Right) π 4 Sprung Weight = Axle Weight(lbs)/2000 2. Press and hold the CAL/CLR switch until "CALL0" is flashing on the display. 4.
Press MODE once and "CHEC" will flash on the display. 5. Press MODE once and the meter will return to normal operation. Front Weight (6) 106.00 Rear Weight (7) 75.10 x Incline Factor (9) 0.95 x Incline Factor (10) 0.98 100.70 73.90 Item and Description Units x Link Factor (11) 1.00 x Link Factor (12) 1.53 1. Year of Calibration Last 2 digits of year Front Weight 100.70 Rear Weight 113.70 2. Month: Day of Calibration XX:XX 3. Hour: Minute of Calibration XX:XX Front Weight 100.70 4. Truck Model Setting Rear Weight 113.70 5. Pressure Front Left psi Total Weight 214.40 6. Pressure Front Right psi x Gain Factor (14) 1.00 7. Pressure Rear Left psi 214.40 8.
Pressure Rear Right psi - Calibration (13) -70.60 9. Front Sprung Weight Tons 10. Rear Sprung Weight Tons 11. Degree of Incline ±° Nose Up Positive 12. Incline Factor - Front Axle 13. Incline Factor - Rear Axle 14. Link Factor Front Axle 15. Link Factor Rear Axle 16. Calibration Weight Tons