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Load Sensing System Section 5 – Procedures
5.3 Load Sensing System
5.3-1 Load Sensing System Overload Status
The platform load sensing system is a device that senses for an overload on the platform before the system disables
boom and drive functions. This system is active when the MEWP is powered on.
If the platform is overloaded while in work mode (the boom is raised greater than 15 degrees from horizontal or is
extended greater than 6 inches), the load sensing system will disable all normal functions and signal the operator
with an indicator light and an audible alarm.
If the platform is overloaded while in travel mode, the load sensing system will signal the operator with an indicator
light and an audible alarm, but will not disable any normal functions.
The following table shows the progression of warnings, indicated to the operator, up to the point of overload.
Mode/Condition
Indicator
Light
Audible
Alarm
Drive
Functions
Powered Boom
Functions (Platform
or Base)
Emergency Power
(Platform)
Emergency Power
(Base)
93-99% of platform capacity On Off Enabled Enabled Enabled Enabled
Lowered Travel Position, ≥
100% of platform capacity
Flashing Pulsing Enabled Enabled Enabled Enabled
Elevated Travel Position, ≥
100% of platform capacity
Flashing Pulsing Disabled Disabled Enabled Enabled
Elevated Travel Position, ≥
100% of platform capacity
for Low Capacity Zone,
Boom extended or lowered
to Border between High and
Low Capacity Zones
Flashing Off Disabled
Boom raise and
Boom retract only
Enabled Enabled
1256AA
WARNING
Do not operate the emergency power unit if the platform capacity is exceeded. If the platform is overloaded
due to contact with an overhead obstruction, do one of the following:
▪
Remove the obstruction from the platform, then after a four-second delay normal functions can be
resumed.
▪
Use the emergency power unit at the base control console to release the platform from the
obstruction.
WARNING
If the platform load sensing system is in fault mode (capacity zone lights flash alternately, overload light
flashes and capacity zone border light illuminates), do the following:
▪
Ensure the platform is level and there are no obstructions contacting the platform.
▪
Shut the MEWP off using either the ignition switch or the e-stop. Restart the engine.
If the platform load sensing system remains in fault mode, the emergency power unit may be used to lower
the platform from the base controls. Contact a qualified/competent person for repairs.
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