JLG 680S Service Manual - Manual (Page 222)

SECTION 4 - BOOM & PLATFORM
4-28 – JLG Lift – 3121234
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 EPBC 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.
Replacing the Level Sensors
Earlier generations of this machine had three different
generations of level sensors that were used on this
machine. JLG P/N 4360503, P/N 4360528, and P/N
4360544. P/N 4360528 and 4360544 supersede P/N
4360503. If one of the 4360503 sensors fail, BOTH sen-
sors must be replaced with two P/N 4360544 sensors.
4360503 Sensors can be identified by the code SSY0185-
13 which is printed on the sensor. Otherwise, single
4360528 or 4360544 9999sensors may be replaced.
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 PWM’d. The control for these functions
are the same as currently implemented for the EPBC
except that the flow through the valves is individually con-
trollable instead of controlled by single the flow control
valve. 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 PM.
The function is enabled first shall remain active until it is
released. Any other function commanded while another
function is active is ignored.
If only one other function is commanded when the active
function is released, the other function will be activated.
If more than one function is commanded when the active
function is released, only one function shall be activated.
Platform Leveling Calibration Procedure
STEP 1: SETTING THE PLATFORM VALVE MINIMUMS
1. Put machine into “Ground Mode”.
2. Start machine and plug in Analyzer.
3. Go to the “Access Level 2” screen.
4. Enter “33271” to get into Access Level 1 mode.
5. Go to the "Personalities" menu and adjust the follow-
ing personalities. Refer to the Personality Ranges/
Defaults table in Section 6 - JLG Control System for
proper setting values.
Basket Level Up Min
Basket Level Up Max
Basket Level Down Max
Jib Up Min
Jib Down Min
6. Recycle EMS.