JLG G12-55A AccuPlace Service Manual - Manual (Page 224)

Electrical System
9.106 G10-55A & G12-55A AccuPlace
FORK POSITION
SENSOR –
MAGNET ABOVE
HIGHEST
WORKING LIMIT 8480 Fault indicates that the
positioning magnet of the
Fork Position sensor is
outside of its linear sensing
range. Y Cycle power to see if fault clears.
Move forks through range, cycling power
periodically, to determine whether sensor
can properly detect position magnet at any
cylinder position.
FORK POSITION
SENSOR – DATA
INVALID 8481 Fault occurs if Fork Position
sensor reports invalid data or
UGM computes an
abnormally large rate of
change in the Fork Position
sensor reading. Y Cycle power to see if fault clears.
If fault is present while no command
exists, then move forks through range,
cycling power periodically, to determine
whether sensor can properly detect the
position magnet at any cylinder position.
If fault exists while joystick command is
present, the UGM is computing larger than
expected changes in Fork velocity. Move
the forks through the range and observe
how the reported position tracks via the
Analyzer under DIAGNOSTICS/BOOM
COMPONENTS.
BOOM ANGLE
SENSOR – DATA
INVALID 8489 UGM computes an
abnormally large rate of
change in the Left Boom
Angle sensor reading. Y Cycle power to see if fault clears.
Lift the Boom through the range and
observe how the reported angular position
tracks via the Analyzer under
DIAGNOSTICS/BOOM COMPONENTS.
The Left Boom Angle sensor reading
should track the Right Boom Angle
reading, as well as, roughly tracking the
Boom Angle Indicator pointer.
BOOM LENGTH
SENSOR – DATA
INVALID 8490 UGM computes an
abnormally large rate of
change in the Boom Length
sensor reading. Y Cycle power to see if fault clears.
Extend the Boom through the range and
observe how the reported length tracks via
the Analyzer under DIAGNOSTICS/
BOOM COMPONENTS.
Help Message
1
DTC Fault Condition
(for configurable items,
fault applies only if
configured)
Fault
Requires
AccuPlace
Reset?
Action(s)