Emergency Descent - JLG X1000AJ Operation And Safety Manual

SECTION 5 - EMERGENCY PROCEDURES

Emergency Descent

The purpose of the Emergency Descent function (ED) is to
bring the operator down to an accessible zone in case the
main power source (diesel engine or electric motor) is not
working. The purpose of this system is not to close the
machine or operate boom functions. It can be activated
from the platform control box or ground control station.
In order to activate ED, the same safety conditions valid for
normal operation boom movements must be verified by the
system. The "machine stabilized icon" must be present on
the display.
In order to activate ED, it is necessary to keep the
emergency descent button (4) pressed in while
performing the appropriate function.
While using ED, if the main power comes back on, ED will
continue to draw power from the 12V battery.
Once the triangle button is pressed and held, the desired
function can be selected. Once the function is selected, the
DC electric pump is activated. The DC electric pump is deac-
tivated when the function selection (joystick) is released.
In order to use the 12V battery to perform an emergency
descent, it must contain 11V to start the procedure. During
the procedure, if the battery drops to 9V, the emergency
descent will stop. You will have to charge the battery before
the emergency procedure can continue. Stopping the emer-
gency procedure at 9V ensures that the battery will have
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enough power to keep the machine's various circuit boards
supplied with the correct voltage.
NOTE: When using the 12V battery to perform an emergency
descent, operation of the swing and main boom
retract function are limited to 10 seconds. You must
activate the function again to continue emergency
descent by releasing the function and re-engaging.
Some functions will not operate since this is a gravity lower-
ing system. The MAIN DOWN symbol will appear on the dis-
play if one of those functions are selected. Also, if the
function is not allowed, when trying to perform a function,
the pump will run for 5 seconds and shut off.
Functions possible during emergency descent are:
• Tower Boom retract
• Main Boom lowering
• Main Boom retract, only possible if the angle
between main boom and ground is over -15°,
limited to 10 second intervals
• Swing, limited to 10 second intervals
• Jib open and close
ENSURE BOOM IS NOT POSITIONED OVER THE OUTRIGGERS OR OVERHEAD
OF PERSONNEL BEFORE LOWERING.
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