JLG 1350SJP Service Manual - Manual (Page 429)

SECTION 6 - JLG CONTROL SYSTEM
3121142 – JLG Lift – 6-53
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.
CAN Errors
The Ground Module has two direct outputs dedicated to over-
riding the Platform Module’s control of the leveling valves. The
Ground Module “Platform Level Up/Down” outputs are used
to control the platform level up and down valves.
When in ground mode, if the Ground Module reads a platform
leveling switch command, the switch command is communi-
cated over CAN to the Platform Module where it is handled
normally.
If Ground Module determines that CAN communication is
inoperable, it turns on the platform control valve and the
appropriate platform leveling override outputs while the
switch is engaged.
If the Platform Module is still running when CAN is down noth-
ing will operate when in platform mode. When the operator
switches to ground mode, the platform will not control any of
its valve outputs and a CAN error message is signaled.
Additional Platform and Jib Valves
The high side drivers for the platform left and right and the jib
up and down valves are be located in the Platform Module and
are proportional. Flow through the valves is individually con-
trollable. The individually controlled duty cycle will be the
same as would otherwise have been commanded to the flow
control valve.
Only one platform or jib function is allowed at one time to
limit the amount of current draw, minimizing the voltage drop
on the supply to the Platform Module.
The function is enabled first shall remain active until it is
released. Any other function commanded while another func-
tion is active is ignored.