JLG 1100S Service Manual - Manual (Page 149)

SECTION 4 - BOOM & PLATFORM
3121256 – JLG Lift – 4-1
SECTION 4. BOOM & PLATFORM
4.1 BOOM SYSTEMS
Broken Cable Indicator System
The boom on this model is a 4 section proportionally
driven telescopic boom. The inner mid boom is driven
directly by the telescope cylinder. The outer mid and fly
booms are each driven by separate wire rope systems.
Each rope system contains redundant ropes that are
capable of allowing the operator to unknowingly continue
use of the machine with a single rope failure. These kinds
of failures with the extend ropes are self revealing to the
operator so proper action can be taken. Failures within the
fly extend ropes are self revealing as they are exposed on
the exterior of the boom where a broken rope would be
obvious. Failures within the outer mid ropes require the
addition of the Broken Cable Indicator System in order to
be self-revealing to the operator. This system uses a prox-
imity sensor to detect excessive movement of the sensed
rope as would be expected with a rope failure. A broken
rope detection results in illuminating the Cable Break indi-
cator on the platform control panel. No restrictions are
made to the functionality of the control system. It is the
responsibility of the operator to take the appropriate
action.
NOTE: For more detailed information concerning system
adjustment and operation, refer to Section 6 - JLG
Control System.
Platform Control Enable System
The platform controls make use of a time dependent
enable circuit to limit the time availability of “live” or
enabled controls. When the footswitch is depressed, the
controls are enabled and the operator has 7 seconds to
operate any control. The controls will remain enabled as
long as the operator continues to use any function and will
remain enabled 7 seconds after the last function has been
used. While the controls are “live”, the enabled light will
be illuminated in the platform display panel. When the
time limit has been reached, the enabled light will turn off
and the controls will be “dead” or disabled. To continue
use of the machine the controls must be re-enabled to
start the timer system over again. This is done by releas-
ing all functions, then releasing and re-depressing the
footswitch.
NOTE: For more detailed information concerning system
adjustment and operation, refer to Section 6 - JLG
Control System.
Transport Position Sensing System
The transport position sensing system uses the boom
angle sensors and the boom length sensor mounted in
the pivot end of the base boom in addition to the boom
length switch mounted on the platform end of the base
boom to sense when the boom is in the position associ-
ated with high speed travel. Above transport angle is rec-
ognized when one angle sensor reads more than 15° with
respect to gravity and resets to within transport position
when both angle sensors read less than 10° with respect
to gravity. Transport length is recognized when both the
length switch and length sensor read less than 2 ft exten-
sion. During failures of either the length switch or length
sensor, the transport length will be determined by the
remaining sensor or switch. The position of the articulated
jib is not considered.
This system is used to control the following systems:
• Beyond Transport - Drive Speed Cutback System
• Jib Stow System - 1100SJP
• Axle Extension System
• Oscillating Axle System - 1100SJP
NOTE: For more detailed information concerning system
adjustment and operation, refer to Section 6 - JLG
Control System.
Beyond Transport - Drive Speed Cutback
System
When boom is positioned beyond the Transport Position,
the drive motors are automatically restricted to their maxi-
mum displacement position (slow speed).
NOTE: For more detailed information concerning system
adjustment and operation, refer to Section 6 - JLG
Control System.