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8.
Regulating the number of rotations and hammering
(Fig. 9)
This Rotary Hammer is equipped with a built-in
electronic control circuit that can adjust and regulate
the number of rotations and times of hammering. This
Rotary Hammer can be used by adjusting the rotation
speed selector switch, depending upon the contents of
operation, such as boring holes into fragile materials,
chipping, centering, etc.
Pressing the rotation speed selector switch switches
rotation speeds as shown in Table 1.
Display lamp
sequence
No-load
250
speed (/min)
Full-load
impact rate
1,400
(/min)
NOTE
The rotation speed cannot be changed by pressing
the rotation speed selector switch while the motor is
rotating. To change speeds, switch off the tool fi rst.
9.
About the protection function
This tool has a built-in protection circuit for preventing
damage to the unit in the event of an abnormality.
Depending on the nature of the abnormality, the display
lamp will fl ash as shown in Table 2 and the unit will
cease to operate. In such cases, verify the problem
indicated by the fl ashing and take whatever steps are
necessary to correct the problem.
8
Rotation speed
selector switch
Display lamp
Fig. 9
Table 1
340
420
1,900
2,350
2,800
Display
lamp
fl ashing
The tool has
shut down
due to internal
temperatures
Flash
which exceed the
unit's specifi ed
temperature.
(Temperature
increase protection
function)
The tool has
shut down due
to an overload
Flash
resulting from
the application of
excessive pressure
to the unit.
(Overload
protection function)
500
Flash
(Circuit protection
function)
Tool fails to startup
or has shut down
Flash
due to a sensor
signal read error.
(Control monitoring
function)
NOTE
Repair may be required if the display lamp continues
to fl ash after taking all necessary steps to correct the
problem. If the problem persists, please arrange for
repairs.
Table 2
Cause
Turn off the tool
and allow it to cool
down for about 15 to
30 minutes.
Once the temperature
is down, the unit
will recover when
the rotation speed
selector switch is
pressed.
Press the rotation
speed selector switch
to recover. Try to avoid
tasks that will apply
excess pressure to
the unit.
Tool fails to
Connect the unit
startup or has
to a power supply
shut down due
matching the input
to the unit being
voltage specifi ed
connected to a
on the nameplate.
power source
Press the rotation
whose voltage
speed selector
is either too
switch to recover.
high or too low.
Allow for an
Tool has shut
interval of
down due to a
3 seconds or more
voltage signal
when plugging
read error that
the power cord
occurred from
in and out. Press
the unit's power
the rotation speed
cord
being
selector switch to
plugged in and
recover.
out at short
intervals.
Press the rotation
speed selector switch
to recover. Repair may
be required if this error
continuously occurs.
Solution
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