M A E D A Mini-Crawler Crane Section 5 – TROUBLESHOOTING
9/2020 MC285CB-3 5-59
Electrical Components
Problem Major Cause(s) Actions
Light is dim. Defective wiring
*Check and repair loose terminals
and open circuits.
Light flickers. Defective wiring *Check and repair.
A “slew detection abnormality” warning
appears on the monitor.
Detection abnormality due
to boom swaying
counterclockwise by 20 degrees
Defective wiring *Check and repair.
Improper limit switch
adjustment
*Adjust or replace.
Battery
Problem Major Cause(s) Actions
Cannot charge
Disconnect switch set to
“UNLOCK”
Set disconnect switch to “LOCK”.
Defective power supply
cable
Replace cable.
Facility circuit breaker is
turned off.
Check circuit breaker.
Status switch is turned off
when starting charging.
Turn on starter switch.
Charging plug not inserted
correctly
Check charging plug.
BMU abnormality * Inspect and replace.
Motor controller abnormality * Inspect and replace.
Over discharge * Inspect and replace.
Charger defect * Inspect and replace.
Battery and controller overheat
High working load
Reduce working load.
Increase interval between tasks.
Working at high elevation
Move to lower elevation.
High ambient temperature
Take measures to protect against
high temperatures.
Warming up is turned on. Turn off warming up.
Cooling fan defect * Inspect and replace.
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