Safety Devices The safety devices ensure safety and prevent damage to the machine. Name
Relief valves
Single holding valve on Boom elevation cylinder Double holding valve on Boom telescope cylinder Double holding (or pilot check) valve on Upper leveling cylinder Foot switch Motion alarm buzzer Emergency stop switch Tilt alarm buzzer Travel speed limit system Rotation lock pin Emergency pump Alarm horn Boom rotating speed limit system Boom elevating speed limit system Traveling speed limit system Work range limit system Boom wire rope failure detecting system Overload sensing system (CE model) Boom / Travel function interlock system (CE model)
Main function
Protect the hydraulic components by relieving abnormally high pressure in the hydraulic system. Prevents the boom from natural descent in the event of hydraulic hose breakage. Prevents the boom from natural retraction and extension in the event of hydraulic hose breakage. Maintains the platform level in the event of hydraulic hose breakage. The boom, traveling and platform rotating functions are disabled unless the foot switch is depressed. The motion alarm buzzer sounds when the machine is in motion to warn the people nearby. Stops all of the movements of the machine when this switch is pressed. The tilt alarm buzzer sounds, if the machine tilts more than 5 degrees. The high and mid speed traveling is disabled, unless the boom is retracted and is lowered under the horizontal. Fixes the turntable to the chassis to prevent the turntable from being rotated when transporting the machine. Auxiliary hydraulic pump driven by the battery. And used to lower the platform in the event of engine or main pump failure. Before moving the machine, sound the alarm horn to warn the people around the machine. This system automatically reduces the boom rotation speed to ensure the safe speed as the boom is extended. This system automatically reduces the boom rising and lowering speed to ensure the safe speed as the boom is extended. This system automatically reduces the traveling speed to ensure the safe speed as the boom extended. This system automatically limits the work radius (Outreach) of the platform within the specific range. (This system is not equipped on SP18A/ISP60.) This system disables the boom extending functions in the event of the boom extension wire rope failure. This system disables all of the functions when the platform is overloaded. (This system is equipped only on CE specifications.) This system stops all of the functions when the travel and boom operations are conducted simultaneously. (This system is equipped only on CE specifications.)
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