JLG 450A_AJ Series II Service Manual - Manual (Page 364)

SECTION 6 - JLG CONTROL SYSTEM
6-54 – JLG Lift – 3121290
8/4 Flash code 8/4 indicates problems with the envelope system.
Only occur on machines with envelope control. 10
BOOM ANGLE SENSOR DISAGREE-
MENT The boom angle sensors are reporting angles that differ too greatly.
An EMS cycle is required.
BOOM LENGTH SWITCH FAILED The boom length switch inputs are reporting the same state. An EMS
cycle is required.
BOOM LENGTH SWITCH/SENSOR
DISAGREEMENT The boom length switch and sensor differ in their reports of
extended or retracted. An EMS cycle is required.
BOOM LENGTH SENSOR NOT
DETECTING LENGTH CHANGE The boom length sensor has not detected a change in length while
the user is commanding telescope. An EMS cycle is required.
BOOM LENGTH SENSOR OUT OF
RANGE HIGH Indicates that the voltage for the boom length sensor is above the
expected range.
BOOM LENGTH SENSOR OUT OF
RANGE LOW Indicates that the voltage for the boom length sensor is below the
expected range.
BOOM LENGTH SENSOR VALUE
OUT OF RANGE HIGH Indicates the length reported for the boom length sensor is above
the expected range. An EMS cycle is required.
BOOM LENGTH SENSOR VALUE
OUT OF RANGE LOW Indicates the length reported for the boom length sensor is below
the expected range. An EMS cycle is required.
BOOM ANGLE SENSOR #1 COMMU-
NICATIONS FAULT Boom angle sensor #1 lost communications with the BLAM. An EMS
cycle is required.
BOOM ANGLE SENSOR #2 COMMU-
NICATIONS FAULT Boom angle sensor #2 lost communications with the BLAM. An EMS
cycle is required.
ANGLE SENSOR #1 INVALID ANGLE An EMS cycle is required.
ANGLE SENSOR #2 INVALID ANGLE An EMS cycle is required.
WRONG TELE RESPONSE The boom telescope is contrary to the user command
WRONG LIFT RESPONSE The boom lift is contrary to the user command
TOWER ANGLE SENSOR DISAGREE-
MENT The tower angle sensors are reporting angles that differ too greatly.
An EMS cycle is required.
TOWER LENGTH SENSOR DIS-
AGREEMENT The tower length sensors are reporting angles that differ too greatly.
An EMS cycle is required.
MAIN ANGLE SENSOR DISAGREE-
MENT The main boom angle sensors are reporting angles that differ too
greatly. An EMS cycle is required.
BOOM LENGTH SENSOR #1 OUT OF
RANGE HIGH Reported from the BLAM, indicates tower length sensor one value is
out of range high.
BOOM LENGTH SENSOR #1 OUT OF
RANGE LOW Reported from the BLAM, indicates tower length sensor one value is
out of range low.
BOOM LENGTH SENSOR #2 OUT OF
RANGE HIGH Reported from the BLAM, indicates tower length sensor two value is
out of range high.
BOOM LENGTH SENSOR #2 OUT OF
RANGE LOW Reported from the BLAM, indicates tower length sensor two value is
out of range low.
TWR LENGTH SENSOR NOT
DETECTING LENGTH CHANGE Tower tele is being commanded and the length sensors are not
changing value.
TWR LENGTH MOVEMENT WITH-
OUT CMD Tower length is changing without a tower tele command
TWR LENGTH SENSOR ONE VALUE
OUT OF RANGE HIGH This fault is reported by the Ground module when the length sensor
value is outside the constant data limit
TWR LENGTH SENSOR ONE VALUE
OUT OF RANGE LOW This fault is reported by the Ground module when the length sensor
value is outside the constant data limit
Table 6-6. Help Fault Codes, Displayed Faults, and Descriptions
Flash Code Fault Displayed on Analyzer Description Priority