JLG 1500SJ Service Manual - Manual (Page 520)

SECTION 6 - JLG CONTROL SYSTEM
6-68 – JLG Lift – 3121262
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 mea-
surements 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 plat-
form 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
necessary to re-cycle the EMS to clear the fault.
6.13 CALIBRATING PLATFORM LEVEL
STEP 1: SETTING THE PLATFORM VALVE
MINIMUMS
1. Position the Platform/Ground select switch to the
Ground position.
2. Plug the analyzer into the connector inside the
Ground control box.
3. Pull out the Emergency Stop switch and start the
engine.