JLG 1100S Service Manual - Manual (Page 325)

SECTION 6 - JLG CONTROL SYSTEM
3121256 – JLG Lift – 6-51
6.14 ELECTRONIC PLATFORM LEVELING
Platform Leveling Fault Warning
If a fault occurs in the platform leveling system the follow-
ing will occur:
1. Automatic platform leveling will stop (except when
there is a fault in only one sensor automatic leveling
will remain active as the control system will use the
other sensor to control leveling)
2. The level fault lamp will flash
3. The audible alarm will sound
4. All functions will default to creep speed if the plat-
form is out of the transport position (extended more
than 24" [60.9 cm], or elevated above the horizontal
position).
To reset the fault the emergency stop switch should be
recycled.
IF THE FAULT PERSISTS BRING THE PLATFORM TO THE GROUND
POSITION, SWITCH THE MACHINE OFF AND CONTACT A QUALI-
FIED SERVICE REPRESENTATIVE TO INVESTIGATE THE FAULT.
Fault Response
ERROR RESPONSE
If basket level varies from the current setpoint by ± 5.5º
for more than 1.5 seconds when the platform is not in the
transport position, the following events will occur:
1. The platform dump valve will be disabled (level,
rotate and jib functions disabled).
2. The level system fault lamp will 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 see below).
When the unit is in the transport position and driving and
the current setpoint varies by ± 5.5º for more than 8 sec-
onds the events 1,2,3 & 4 above will occur. (note function
speeds will operate normally). Cycling the EMS will clear
the fault and allow the operator to operate the machine as
a new level setpoint is taken.
VALVE DRIVER ERRORS
There are three possible level valve driver errors, short to
battery, short to ground, and open circuit.
1. In the case of a short to ground or an open circuit,
the platform valve cannot be turned on and the fol-
lowing 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 platform is in the transport position).
2. In the case of a short to battery on one of the plat-
form leveling valves, the valve cannot be turned off
and the following will occur:
a. The platform dump valve will be turned off to
prevent unintended tilting of the platform.
b. All interactions with platform leveling shall
cease.
c. The Electronic Leveling System Fault Lamp shall
flash (to indicate that the leveling function has
been lost).
d. The platform alarm will sound.
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 platform 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 platform 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.