“4069RT” Service and Parts Manual March 2014
Page 2-19
GP400 CONTROL MODULE SETUP
GP400 C
ALIBRATION
CALIBRATION OF THE GP400 MAY BE PERFORMED ONLY BY QUALIFIED,
TRAINED AND AUTHORIZED PERSONNEL.
READ ALL INSTRUCTIONS CLOSELY BEFORE ATTEMPTING EACH STEP
OF THE CALIBRATION PROCEDURE.
The EZ-Cal hand-held device (MEC part # 90888) is required to access the GP400 for
troubleshooting and calibration.
The GP400 processor relies on sensors to monitor platform elevation at all times. These
sensors send varied voltages to the GP400 that relate directly to their respective position.
The calibration process is the means by which the GP400 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 GP400 may
learn that 1.8 volts (fictional number used for explanation) represents the fully stowed
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
GP400 is replaced or displays a code that indicates the need to recalibrate.
Tilt Sensor Calibration is required on all machines regardless of installed options and
must be performed first.
Height Calibration follows Tilt Sensor Calibration for machines not equipped with the
Optional Overload Sensing System and consists of only height calibration. Skip this pro-
cedure if your machine is equipped with the optional Overload Sensing System.
Separate calibration is required of all machines outfitted with the optional Overload Sens-
ing System. All steps in the Overload Sensing System calibration must be performed in
the proper sequence before the GP400 will recognize complete and proper calibration.
Begin with the Tilt Sensor Calibration, then proceed to the Optional Overload Sensing
System Calibrations section.
If the calibration procedure is performed incorrectly or if there is a failure in one of the
monitored circuits during the calibration, the GP400 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.
This and other procedures can only be performed using an EZ-Cal scan tool. If you do not
have an EZ-Cal, please contact MEC to obtain one.
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