JLG 1100SB Service Manual - Manual (Page 219)

SECTION 4 - BOOM & PLATFORM
3121265 – JLG Lift – 4-49
4.8 BROKEN BOOM CABLE PROXIMITY
SWITCH
This system uses a proximity switch to detect excessive
movement 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 system. 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.
4.9 ELECTRONIC PLATFORM LEVELING
NOTE: For more detailed information concerning system
adjustment and operation, refer to Section 6 - JLG
Control System.
Description
Electronic platform leveling replaces the conventional
hydraulic method of platform leveling.
To control electronic platform leveling the platform is
equipped with a pair of tilt sensors, one primary and one
secondary, mounted to the non-rotating portion of the
platform rotator. The tilt sensors are monitored regularly
and the platform level up and down valves are automati-
cally controlled to maintain
set point as the machine is
operated.
PRIMARY AND SECONDARY TILT SENSOR INTERAC-
TION
The secondary tilt sensor is used as a backup to the pri-
mary tilt sensor. Any time a tilt
set point is reset, a value
from each sensor 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.)
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 secondary tilt sensor will output descending voltage
values with increases in positive platform angle.
Figure 4-30. Broken Boom Cable Proximity Switch Location