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Page 49 34-J Desel - Servce & Parts Manual
December 2021 Secton 16 - Control System
GP500 Calibration
ART_4891
P1 P2 P3 P4 P5 P6 P7 P8
P9 P10 P11 P12 P13 P14 P15
1
4
1
4
1 3 1 3
1
4
1
4
1
4
1
4
7 1
4 1
4
1
4
1
4
7
10
13
1
4
7
10
1
4
7
10
13
1
4
7
10
13
GP440 Module
Upper Controls
Box
GP440
Module
EZ-Cal Port
EZ-Cal port on
bottom, facing down
The GP500 processor relies on angle level and extension sensor(s) to monitor platform position at
all times. These sensors send varied voltages to the GP500 that relate directly to their respective
position. The calibration process is the means by which the GP500 equates these voltages to actual
platform elevation.
For example, the Angle Transducer, used to monitor platform elevation, varies its output between 1
and 4 volts through 140 degrees of rotation. During calibration the GP500 may learn that 1.8 volts
(fictional number used for explanation) represents the fully lowered position and 3.6 volts represents
the fully elevated position and therefore voltages between those figures relate to various heights in
between.
All machines are calibrated at the factory and should not require calibration unless the GP500 is
replaced, sensors are replaced or it displays a code that alerts to the need to recalibrate.
If the calibration procedure is performed incorrectly or if there is a failure in one of the monitored
circuits during the calibration, the GP500 will not allow the operator to continue with the calibration
process. An error message will display on the EZ-Cal indicating the reason for the interruption.
Additional details of these error messages can be found at the end of the calibration instructions.