Maeda LC1385M-8BF - Moment Limiter; Over Hoist Detector

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8.5.5 MOMENT LIMITER
• : Always contact us or our sales service agency when dealing with these items.
• In causes of problems or causes which are not listed blow, contact us or our sales service agency for
repairs.
NOTES
When an error code is displayed on the moment limiter display unit, refer to “Operation 2.4.10 Moment
Limiter Error Causes and Actions to be Taken”.
When the moment limiter display is normal
Problem
Main causes
Remedy
Crane operations does not stop
even when overloaded
Defective relay circuit on the
CPU card
Replace moment limiter trans-
ducer
Defective moment limiter emer-
gency stop cancel switch
Check, replace emergency stop
cancel switch
Defective solenoid valve spool
Repair, replace solenoid valve
Short circuit in the emergency
power supply circuit
Check, replace solenoid valve
wiring
Boom extending, boom lowering
and hook hoisting operations
not activated even when not
overloaded
Defective wiring between the
moment limiter transducer and
solenoid valve
Check, repair, or replace wiring
between moment limiter
transducer and solenoid valve
Defective solenoid valve coil or
spool
Disassemble, repair, or replace
solenoid valve
8.5.6 OVER HOIST DETECTOR
• : Always contact us or our sales service agency when dealing with these items.
• In causes of problems or causes which are not listed blow, contact us or our sales service agency for
repairs.
★Boom extending or hook hoisting operation does not stop even when over hoisted
Problem
Main causes
Remedy
Boom extending or hook
hoisting operation does not stop
even when over hoisted, but
buzzer sounding
Short circuit in emergency
power supply circuit
Check, replace solenoid valve
wiring
Defective Over-hoisting cancel
switch
Check, replace switch
Boom extending or hook
hoisting operation does not stop
even when over hoisted, but
buzzer does not sound
Defective over hoist detector
Check, replace over hoist
detector
★Boom extending or hook hoisting operation not activated even when not over hoisted
Problem
Main causes
Remedy
Boom extending or hook
hoisting operation not activated
even when not over hoisted, but
buzzer sounding
Defective over hoist detector
Check, replace over hoist
detector
Breakage of over hoist detector
wiring or entanglement of the
wiring
Check, repair, or replace over
hoist detector wiring
Loss of over hoist detector
weight
Check, replace over hoist
detector weight
Defective wiring between the
moment limiter transducer and
over hoist detector
Check, repair, or replace wiring
between moment limiter
transducer and over hoist
detector
Boom extending or hook
hoisting operation not activated
even when not over hoisted, but
buzzer does not sound
Defective solenoid valve coil or
spool
Disassemble, repair, or replace
solenoid valve
Defective wiring between the
moment limiter transducer and
solenoid valve
Check, repair, or replace wiring
between moment limiter
transducer and solenoid valve