JLG 1100S Service Manual - Manual (Page 326)

SECTION 6 - JLG CONTROL SYSTEM
6-52 – JLG Lift – 3121256
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.
CAN Errors
The Ground Module has two direct outputs dedicated to
overriding 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 plat-
form leveling switch command, the switch command is
communicated 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
nothing 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 controllable. 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
function is active is ignored.