Section 4 – ELECTRIC MOTOR (OPTION) Mini-Crawler Crane M A E D A
4-132 1/2019 MC405C-3
Main Breaker (with a Leak Detector)
WARNING!
• Make sure the breaker is OFF when this
machine derives no power from power
supply equipment and when work is
completed.
• Abnormal conditions are encountered
around the Inverter unit, electric motor, or
electric wiring when the breaker is
automatically turned OFF during operation.
Be sure to locate failures and check for
burnt smell and parts. Promptly contact us
or our sales service agency.
• Inspection and repair must be completed
before turning ON the breaker to re-supply
power.
Potential fire or machine failure may occur if
disregarded.
The main breaker is equipped with the parts
shown in the figure.
Fig. 4-382
• The breaker (1) is designed to provide
automatic shutoff of the power that is supplied
from the Inverter unit to the electric motor in the
event of an error including overcorrect and
overvoltage, to prevent fire and machine failure.
The breaker (1) also controls the supply of
power to the electric motor and Inverter unit.
• ON: Power is supplied.
• OFF: No power is supplied.
• The overvoltage/ground-fault indication button
(2) on the cover is designed to eject in the
event of an overvoltage or ground fault.
For reset, press the breaker to turn the ON.
• The trip button (3) is designed to mechanically
trip the breaker as external control.
• The ground-fault test button (4) is used to test
tripping in response to a ground fault.
Proper tripping is assured if the
overvoltage/ground-fault indication button (2)
on the cover ejects.
CAUTION: Periodic (biannual) ground fault
test is recommended.
The test button should be controlled at 10-
second or longer intervals and not be
pressed more than requires.
If an indication of a ground fault remains on
after the overvoltage/ground-fault indication
button (2) is reset, contact us or our sales
service agency.
DC12V Power Switch
The DC12V power switch is used to switch the
DC power output source for the crane operation
system.
Fig. 4-383
• ON: Power is supplied to the crane operation
system.
• OFF: No power is supplied to the crane
operation system.
(1) Breaker
(2) Overvoltage/ground-fault indication
button (yellow)
(3) Trip button (red)
(4) Ground-fault test button (grey)
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