M A E D A Mini-Crawler Crane Section 4 – CRANE SAFETY DEVICES
9/2020 MC285CB-3 4-57
Interlock Characteristics
Interlock Functions Description of Interlock Function
and Action
Outrigger Interlock
The outriggers will not operate unless the outrigger rotaries are
rotated in the extended direction (outward) while the boom is
stowed (boom fully lowered and in slewing stowage position).
• The boom in a fully lowered state is detected by the angular
sensor on the boom.
If an abnormality occurs during operation, check the angular
sensor on the boom.
• The boom slewing stowage position is detected by the detection
switch on the slewing unit detecting whether the boom stops at
the slewing stowage position.
If an abnormality occurs during operation, check the
detection or
switch on the slewing unit.
Crane Interlock 1
The crane cannot be operated (telescoping, hoisting up and down,
raising/lowering, and slewing) unless all four outriggers have made
ground contact (extended and in contact with ground).
The outrigger installation status is detected as follows:
• Each outrigger rotary is fitted with a detection switch, which
detects whether the rotary is expanded to the extended position.
If an abnormality occurs during operation, check the detection
switch on the rotary unit.
• A detection switch is mounted at the base of each outrigger
cylinder, which detects whether the outrigger is in contact with the
ground based on the load on the cylinder.
If an abnormality occurs during operation, check the detection
switch on the cylinder base.
Crane Interlock 2
• If “2 or more adjacent outriggers are lifted” is detected while
operating the crane, crane operations will be partially restricted
(preventing operations other than retraction and lowering).
In this case, the Working Status Lamp flashes in red, and the
alarm buzzer sounds.
• If the “2 or more adjacent outriggers are lifted” status clears when
the lever is returned to the NEUTRAL position, normal crane
operations are enabled.
• If the lifted outrigger status is not cleared even when the lever is
returned to the NEUTRAL position, the boom must be retracted
first and the outriggers reset.
DANGER! If the “2 or more adjacent outriggers are lifted” status occurs, use the Override switch
to clear this status. Comply with all precautions described in “Override Switch” when using the
Override switch.
WARNING! If the Detection Switches are
damaged, verify the ON/OFF operation of the
lights on the outrigger display, and the
operation of the crane interlock and outrigger
interlock functions. If any problems are found,
contact us or our sales service agency.
If boom operation is not enabled after the
outrigger has been extended and set, the
outrigger safety device may have failed or
need adjustment.
Contact us or our sales service agency to
request inspection and repair service.
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