Hitachi DH 40MEY Instructions De Sécurité Et Mode D'emploi page 8

English
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
250
speed
Impacts per
1,430
Minute
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.
8
Power lamp
Fig. 3
Rotation speed
selector switch
Display lamp
Fig. 4
Table 1
330 410
1,900 2,370 2,850
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
RPM has gradually
decreased due
to the tool's
temperature
increase protection
function detecting
temperatures
Flash
approaching the
unit's specifi ed
temperature range
for automatic
or
shutdown.
(Power regulation
function)
* If one or two
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
500
the application of
excessive pressure
to the unit.
(Overload
protection function)
Table 2
Cause
The tool will operate
normally once the
temperature has been
lowered by reducing
the workload.
Continued use
will activate the
temperature increase
protection function
which may result in
automatic shutdown.
(See box below)
bars of the
display lamp
are fl ashing, the
power regulation
function will not
be activated.
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.
Solution