NOTE: This screen is the only place that the value of the G t gain potentiometer can be checked. Viewing Payload Calculation Inputs 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. The PLM ΙΙ estimates payload by monitoring sus- pension pressures when the truck is loaded and com- pares them to truck empty pressure values. The PLM uses one empty truck weight for all payload calcu- lations. 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 com- ponents suspended above the suspensions. The proc- ess of making the PLM ΙΙ calculate the tare weight is called the calibration procedure. Example Calculation of Payload These calculations used a 13" front suspension diame- ter and 10" rear suspension diameter. This calibration weight is used as item #13 from the manual calculation procedure in Figure 20-4. Sprung Weight = π 4 Suspension Diameter2 (Psi Left + Psi Right) Sprung Weight = Axle Weight(lbs)/2000 1. Press and hold the LIGHT/INC and MODE switches until "CHEC" is flashing on the display. 2. Press and hold the CAL/CLR switch until "CALL0" is flashing on the display. 3.
Press the CAL/CLR switch to cycle through the following data. The sequence repeats. Figure 20-5. 4. Press MODE once and "CHEC" will flash on the display. 5. Press MODE once and the meter will return to normal operation. M20007.1 03/02 Payload Meter II M20-9 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 x Link Factor (11) 1.00 x Link Factor (12) 1.53 Front Weight 100.70 Rear Weight 113.70 Front Weight 100.70 Rear Weight 113.70 Total Weight 214.40 XGain Factor (14) 1.00 214.40 - Calibration (13) -70.60 Item and Description Units 1. Year of Calibration Last 2 digits of year 2. Month:Day of Calibration XX:XX 3.
Hour:Minute of Calibration XX:XX 4. Truck Model Setting 5. Pressure Front Left Psi 6. Pressure Front Right Psi 7. Pressure Rear Left Psi 8. Pressure Rear Right Psi 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