JLG 680S, Service And Maintenance Manual

Page: 311 / 530

SECTION 4 - BOOM & PLATFORM
3121234 4-47
e. A system fault will be logged.
f. All function speeds (lift, swing, telescope and drive)
will be placed in creep mode (except when the plat-
form is in the transport position)
3. In the case of a short to battery on the platform dump
valve , the valve cannot be turned off. The controllability
of the platform leveling function will be impaired and
the following will occur:
a. All interactions with platform leveling shall cease.
b. The Electronic Leveling System Fault Lamp shall
flash (to indicate that the leveling function has been
lost).
c. The platform alarm will sound.
d. A system fault will be logged.
e. All function speeds (lift, swing, telescope and drive)
will be placed in creep mode (except when the plat-
form is in the transport position).
Lift, swing, drive and telescope will continue to operate.
In each of the cases above it shall be necessary to re-cycle the
EMS to clear the fault. Operable functions shall be in the creep
mode except while below elevation.
TILT SENSOR ERRORS
If the secondary tilt sensor is faulty, the control system will con-
tinue 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 platform angle control 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 tog-
gle 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 overrid-
ing 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 platform
leveling switch command, the switch command is communi-
cated over CAN to the Platform Module where it is handled nor-
mally.
If Ground Module determines that CAN communication is inop-
erable, 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 genera-
tions 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 sensors must be replaced with two P/N 4360544 sen-
sors. 4360503 Sensors can be identified by the code SSY0185-13
which is printed on the sensor. Otherwise, single 4360528 or
4360544 9999 sensors may be replaced.