JLG 1850SJ Service Manual - Manual (Page 341)

SECTION 6 - JLG CONTROL SYSTEM
3121619 – JLG Lift – 6-59
TILT SENSOR ERRORS
If the secondary tilt sensor is faulty, the control system will
continue to utilize information from the primary sensor.
If the primary sensor is faulty, the control system will switch to
the backup sensor for control.
In both cases above the following will occur:
1. The Electronic Leveling System Fault Lamp will flash (to
indicate that there is a leveling fault).
2. The platform alarm will sound.
3. A system fault will be logged.
4. All function speeds (lift, swing, telescope, jib and drive)
will be placed in creep mode (except when the platform
is in the transport position).
5. Automatic leveling remains active.
Lift, swing, drive and telescope will continue to operate.
In each of the cases above it will be necessary to re-cycle the
EMS to clear the fault. Operable functions shall be in the creep
mode except while below elevation.
When both sensors appear to be working but have measure-
ments that disagree by ±5.5º The following will occur:
1. All interactions with platform leveling shall cease.
2. The Electronic Leveling System Fault Lamp shall flash (to
indicate that the leveling function has been lost).
3. The platform alarm will sound.
4. A system fault will be logged.
5. All function speeds (lift, swing, telescope and drive) will
be placed in creep mode (except when the platform is in
the transport position)
At this point, the operator must use the level up and down
toggle switch to manually level during descent. It shall be nec-
essary to re-cycle the EMS to clear the fault.