Payload Meter III - Section 60 OM6009 1/04 Page 60-4 COMPONENT DESCRIPTION System Diagram Suspension Pressure Sensors Operator Display PLMIII uses a two-wire pressure sensor. The range for the pressure sensor is 4000 psi (281 kg/cm 2 ) and the overload limit is 10,000 psi (700 kg/cm 2 ). One wire to the sensor is the supply voltage and the other is the signal. The 0-4000 psi range is con- verted into an electrical current between 4-20 ma. The supply voltage for the sensor is nominally +18vdc. Each pressure sensor has an 90" length of cable that is terminated with #10 ring terminals. The cable is specially shielded and reinforced to provide mechanical strength and electronic noise immunity.
A typical part number for the pressure sensor is PC0328. The speedometer/display gauge is used as a speedometer and payload display. The top display is used for speed and can display metric (km/h) or English (mph) units. Grounding terminal #4 on the back of the speedometer will switch the meter to display metric units. Leaving terminal #4 uncon- nected will cause the gauge to display English units. The speedometer can be adjusted using a calibra- tion potentiometer in the back just like existing speedometers. The payload meter uses the lower display for pay- load information. The normal display mode shows the current payload.
The display can be changed to show the load and total tons counter or the Operator ID. Using the operator switch on the dash panel, the current suspension pressures and incline can be displayed. The units for display are set using the PC software. Payloads can be displayed in Short Tons, Long Tons or Metric Tons. A typical part num- ber for this gauge is the PC0550. Inclinometer The inclinometer is used to increase the accuracy of load calculations on an incline. The inclinometer uses three wires. For the sensor, red is the +18vdc supply voltage, black is ground and the white is the signal. The incline signal is a voltage between 1 and 4 volts.
Zero degrees of incline is represented by 2.6vdc on the signal line. The voltage signal will be decreased by 0.103vdc for every degree of nose up incline. A typical part number for the inclinome- ter assembly is 7861-92-5330.