Hitachi DH 52ME Mode D'emploi page 8

English
(3) Pull the tool to make sure it is locked completely.
(4) To remove the tool, fully pull the grip in the direction
of the arrow and pull out the tool.
7. Power lamp
The power lamp lights up when the power cord is
plugged into an electrical outlet. (Fig. 3)
8. Regulating the number of rotations and hammering
(Fig. 4)
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
Full-load
110
speed
Impacts per
1,000
Minute
8
Power lamp
Fig. 3
Rotation speed
selector switch
Display lamp
Fig. 4
Table 1
160 210
1,400 1,800 2,200
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.
Display
lamp
fl ashing
The tool's
temperature
increase protection
function gradually
reduced the
rotation speed
Flash
as the internal
temperature of the
tool approached
the specifi ed
temperature range
for automatic
or
shutdown.
(Power regulation
function)
* The power
regulation function
will not activate if
only one or two of
the display lamp
bars are lighting.
Internal temperature
has risen beyond
Flash
the unit's specifi ed
temperature
(Temperature
increase protection
function)
Excessive pressure
Flash
applied to the tool
has resulted in an
overload.
(Overload protection
function)
260
Table 2
Cause Solution
The tool will return to
normal power once the
temperature is lowered
by reducing its load.
Continued operation
may result in automatic
shutdown by the tool's
temperature increase
protection function.
(See row below)
Turn off the unit
and allow it to cool
down for about 15 to
30 minutes.
When the temperature
goes down, press the
rotation speed selector
switch to recover.
Press the rotation
speed selector switch
to recover. Try to avoid
tasks that will apply
excess pressure to the
unit.