JLG 680S, Руководство по обслуживанию и ремонту

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SECTION 4 - BOOM & PLATFORM
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These zones are prioritized when multiple functions are active.
The priorities are as follows.
1. Auxiliary power and any other function, zone = auxiliary
power
2. Drive and any other function, zone = Drive
3. Lift up and any other function, zone = Lift up
4. Lift down and any other function, zone = Lift down
5. Other boom functions, zone = Other boom functions
During the power-up procedure, function enable, in both Plat-
form and Ground Mode, is delayed during the 1.5 second startup
lamp test. During this 1.5 second startup period, the basket level
up valve will be energized at 100% duty cycle for 0.5 second, and
then the basket level down valve energized at 100% duty cycle
for 0.5 second. This will help to keep the valves from sticking.
PLATFORM LEVEL MANUAL OVERRIDE
In addition to automatic platform angle control, the operator is
able to manually adjust the platform level position by means of
the level override switches located at the platform and ground
control positions (similar to a Slave hydraulic system).
If a command from the Platform Level Up and Down toggle
switch on either the platform or the ground is received, auto-
matic platform angle control will cease and the appropriate out-
put will be commanded to turn on.
The duty cycle of the output shall be scaled from the pump
potentiometer. When the toggle switch is released, after one sec-
ond, the current filtered value of tilt angle will be taken as the
new set point.
In other words the operator can chose a platform level incline
other than level with gravity and the system will maintain the
chosen platform angle within several degrees of setpoint.
Platform Leveling Fault
The JLG Control System takes a snapshot of the two sensor val-
ues and records the difference once on each power up. The Con-
trol system allows a ±5 degrees difference from those values. For
example, if Sensor 1 is at 5 degrees and Sensor 2 is at 11 degrees,
the difference is 6 degrees and the DTC is triggered when the
sensors are 1 degree (or less) apart or 11 degrees (or more) apart.
If a fault occurs in the platform leveling system the following will
occur:
1. Automatic platform angle control will stop and the plat-
form dump valve will be disabled (level, rotate, and jib
functions disabled). The exception is when there is a
fault in only one sensor automatic platform angle con-
trol will remain active as the control system will use the
other sensor to control leveling.
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 platform is in
the transport position see below).
To reset the fault the emergency stop switch should be recycled.
IF THE LEVEL SYSTEM FAULT INDICATOR REMAINS ILLUMINATED, RETURN
THE PLATFORM TO THE STOWED POSITION, SHUT DOWN THE MACHINE, AND
REPAIR THE LEVELING SYSTEM.
ERROR RESPONSE
If basket level varies from the current setpoint by ± 5.5° for more
than 2 seconds for large variations from setpoint when the plat-
form is not in the transport position, the controls assume the sys-
tem is not properly set up or has degraded and initiate a fault.
When the unit is in the transport position and driving and the
current setpoint varies by ± 5.5° for more than 10 seconds the
events 1,2,3 & 4 above will occur. (Note function speeds will
operate normally). Since the control system can not anticipate all
conditions under which a machine is to be operated, these
parameters have been chosen to provide reasonable perfor-
mance and safe operation. If an error occurs, cycling the EMS will
clear the fault. The operator should evaluate the operating situa-
tion and assess his machine to determine the source of the fault.
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 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).
2. In the case of a short to battery on one of the platform
leveling valves, the valve cannot be turned off and the
following will occur:
a. The platform dump valve will be turned off to pre-
vent 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.