DeWalt DWP849 Guide D'utilisation page 10

Use lower speeds for applying liquid waxes and polishes and higher
speeds for removing dried liquid. Use the highest speed (fully depress
trigger) for buffing the car to a final lustre.
The tool can be locked on for continuous use by squeezing the trigger
switch fully and depressing the lock button (G) shown in Figure 1. Hold
the lock button in as you gently release the trigger switch. The tool will
continue to run. To turn the tool off from a locked-on position, squeeze
and release the trigger switch once. Do not unplug the tool with the
switch in the locked-on condition. Make sure the tool is not locked on
when plugging in.
The variable speed trigger switch (C) has a no-volt release function.
In the event of a power outage or other unexpected shut down, the
trigger switch needs to be cycled (depress the trigger switch, release,
then depress again) to restart the tool. Do not unplug the tool with
the trigger switch in the locked-on condition. Make sure the tool is
not locked on when plugging in. If the tool is plugged back in with the
trigger switch in the locked-on position, the tool will not run until the
trigger switch (C) is cycled as described above.
NOTE: The trigger switch can only be locked on with the tool running
at the maximum RPM designated by the speed control wheel (A).
Speed Control Wheel (Fig. 1)
The maximum speed of your tool can be changed by rotating the
speed control wheel (A) to the desired setting. The wheel incorporates
detents to prevent inadvertent wheel movement and to facilitate speed
selection. For added versatility, the trigger switch may be locked in its
full on position and tool speed changed by means of the speed control
wheel (A) alone.
The electronic speed control not only lets you select the speed to suit
the job, but also helps to maintain that speed as you load the tool by
pressing down. It's this feature, coupled with the variable speed trigger
switch, that make this tool such a value.
The speed control wheel (A) can be set for any speed between 600
and 3500 RPM and the variable speed switch will then control tool
speed from zero to the wheel setting. For example: A control wheel
setting of 2200 RPM will allow the variable speed switch to operate the
tool between zero and 2200 RPM, depending on how far the trigger
switch is depressed. A wheel setting of 600 RPM would allow the
switch to operate the tool from zero to 600 RPM.
The electronic speed control feature comes into play whenever the
trigger switch is fully depressed and the tool is running at the selected
speed determined by the setting of the control wheel. As you load
the tool by pushing it down on the work surface, (with the trigger fully
depressed) the electronic circuit inside the tool will compensate for
the loading and maintain the selected speed. If the speed selected by
the control wheel is 2200 RPM, as in the example above, the tool will
maintain 2200 RPM, as it is loaded.
It is important to remember two things about electronic speed control:
1. The electronic speed control operates only when the trigger switch
(C) is fully depressed.
2. The effect of electronic speed control is much easier to observe at
lower speed settings (2600 RPM and below), than at high speeds.
As the tool approaches 3000 RPM, the effect is considerably less
dramatic.
Keep in mind that, with a conventional polisher running at a typical
no-load speed of 2400 RPM, the tool slows down to about 2000 RPM
under a polishing load. Your DWP849 or DWP849X will continue to run
at 2400 RPM (or any speed you select with the control wheel) as a
load is applied. Since it doesn't slow down, the speed may be greater
than you're used to, so some extra caution should be observed until
you get the "feel" of your polisher. If you feel the speed is too great,
you can, of course, slow the tool down with either the trigger switch
or the control wheel.
8