Oshkosh Corporation JLG 450AJ, Service And Maintenance Manual

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SECTION 6 - JLG CONTROL SYSTEM
3121659 – JLG Lift – 6-47
DRIVE PREVENTED – TILTED &
ABOVE ELEVATION 2517 MACHINE SETUP > FUNCTION CUTOUT = DRIVE CUT E&T
The boom is Above Elevation
The chassis is considered Tilted
The operator is attempting to activate Drive or Steer The UGM shall prohibit Drive
and Steer Not all of the trigger conditions are met
DRIVE PREVENTED – BOOM
SELECTED 2518 MACHINE SETUP > FUNCTION CUTOUT = BOOM CUTOUT
The boom is Above Elevation
Any boom function is already active
The operator attempts to activate Drive or Steer The UGM shall prohibit Drive
and Steer Not all of the trigger conditions are met
DRIVE & BOOM PREVENTED -
SOFT TOUCH ACTIVE 2549 MACHINE SETUP > SOFT TOUCH = YES;
Machine is in Platform Mode;
Soft Touch State = Enabled Response detailed in Soft
Touch section Not all of the trigger conditions are met
SKYGUARD SWITCH – DIS-
AGREEMENT 2563 MACHINE SETUP > SKYGUARD = YES;
Machine is in Platform Mode;
[(SkyGuard input #1 Platform Module J7-18) ≠ (SkyGuard
input #2 Platform Module J1-23)] > 160ms Response detailed in Sky-
Guard section [{SkyGuard inputs (Platform Module J7-18
= High) and (Platform Module J1-23 =
High)} and (Footswitch State = Not
Depressed)]
TEMPERATURE CUTOUT ACTIVE
– AMBIENT TEMPERATURE TOO
LOW 2568 Low Temperature Cutout = Active If the Boom is Above Eleva-
tion;
The UGM shall suspend
motion;
The UGM shall limit the
machine to Creep speed after
controls initialized
If the Machine is in Platform
Mode and if the Boom is not
Above Elevation;
The UGM shall limit Swing,
Tower Lift (340AJ. 450AJ),
Tele, Lift, Platform Rotate,
Platform Level, and Jib Lift (if
MACHINE SETUP > JIB = YES)
to Creep speed
Low Temperature Cutout = Inactive;
Full Speed permitted after controls are ini-
tialized
PLATFORM LEVEL PREVENTED
– ABOVE ELEVATION 2576 Platform Level Override Cutout = Enabled;
The Platform Level Up or Down switch input = High;
Footswitch is active The UGM shall suspend Plat-
form Level Up and Down
commands;
The UGM shall prohibit Plat-
form Level Up and Down Controls initialized
BRAKE – SHORT TO BATTERY 331 The UGM detects a short to battery at this output The UGM shall prohibit Drive
and Brake outputs. Power Cycled
BRAKE – OPEN CIRCUIT 332 The UGM detects an open circuit at this output No response required for this
DTC Power Cycled
LIFT UP VALVE – OPEN CIRCUIT 334 The UGM detects an open circuit at this output The UGM shall suspend Lift
Up and Down command and
revert to Open Loop Current
control for Lift;
The UGM shall limit Lift Up
and Down to Creep speed
after controls initialized The UGM no longer detects open circuit;
Full speed Lift Up and Down permitted after
controls are initialized
Table 6-5. Diagnostic Trouble Code Chart
Help Message DTC
Fault Condition/Trigger
(For configurable items, fault applies only if
configured. All listed conditions to be met unless
stated otherwise)
Required Control
Response or State
Assignment
Conditions Required for Movement
and/or to Clear Fault