Oshkosh JLG 1500SJ, Service And Maintenance Manual

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SECTION 4 - BOOM & PLATFORM
3121262 – JLG Lift – 4-87
4.17 BROKEN BOOM CABLE PROXIMITY SWITCH
This system uses a proximity switch to detect excessive move-
ment of the cable block. If movement is detected the Cable
Break indicator will illuminate in the platform control panel.
No restrictions are made to the functionality of the control sys-
tem. It is the responsibility of the operator to take immediate
action.
To avoid damaging the proximity switch, install and adjust
after assembling the switch block, compression spring, and
torquing the wire ropes.
Adjusting the Proximity Switch
1. Thread the switch in until it contacts the adjuster block.
2. Thread the switch out 1/8 to 1/2 turn to achieve proper
sensing range.
3. Tighten the jam nut.
4.18 ELECTRONIC PLATFORM LEVELING
NOTE: For more detailed information concerning system adjust-
ment and operation, refer to Section 6 - JLG Control Sys-
tem.
Description
Electronic platform leveling replaces the conventional hydrau-
lic method of platform leveling.
To control electronic platform leveling the platform is
equipped with a pair of tilt sensors, one primary and one sec-
ondary, mounted to the non-rotating portion of the platform
rotator. The tilt sensors are monitored regularly and the plat-
form level up and down valves are automatically controlled to
maintain
set point as the machine is operated.
PRIMARY AND SECONDARY TILT SENSOR
INTERACTION
The secondary tilt sensor is used as a backup to the primary tilt
sensor. Any time a tilt
set point is reset, a value from each sen-
sor shall be set.
If a fault occurs with the primary sensor, control will revert to
the secondary sensor. (This is discussed in more detail in the
Error Response section in Section 6 - JLG Control System.)
Because of the mounting orientation of the tilt sensors, the
primary tilt sensor will output ascending voltage values with
increases in positive platform tilt angle. The backup or second-
ary tilt sensor will output descending voltage values with
increases in positive platform angle.
Figure 4-25. Broken Boom Cable Proximity Switch Location