Page 59
Speed Level Seres - Servce & Parts Manual
January 2019
Secton 6 - Electrcal System
GP400 Calibration
The EZ-Cal hand held device (MEC part # 90888) is required to access the GP400 for
troubleshooting and calibration.
The GP400 processor relies on angle and pressure sensors to monitor machine position 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 machine
position.
For example, the Angle Transducer, used to monitor platform elevation, varies its output between
1 and 4 volts through a 140 degree 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 if the GP400 displays a code that alerts to the need to recalibrate.
Tilt Sensor calibration is required on all machines regardless of destination or certification (ANSI or
CE) and must be performed first.
ANSI calibration follows Tilt calibration for machines not equipped with an overload protection system
and consists of only height calibration.
CE calibration is required of all machines outfitted with an Overload Protection System as required
for CE certification. All steps in the CE calibration must be performed in the proper sequence before
the GP400 will recognize complete and proper calibration. Begin with the ANSI/CE Tilt Sensor
Calibration, then proceed to the CE Calibrations section.
If the calibration procedure is performed incorrectly or 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.
ANSI/CE Tilt Sensor Calibration
Correctly performing the following procedure will ensure that your machine will continue to auto-level
correctly and operate safely.
The automated leveling system relies on the information provided by three sensors:
The platform tilt sensor (Platform CAN Tilt Angle Transducer) is used to level the platform to
within 0.2 degrees of absolute level when auto-leveling. It is also use by the control system to
monitor platform level status for enhanced unit stability. The platform tilt sensor is located inside
the Lower Boom Mount.
The axle sensor (Axle CAN Tilt angle transducer) which is mounted to the front oscillating axle
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