Bosch GRL 400 H Professional Notice Originale page 21

OBJ_BUCH-1179-004.book Page 21 Monday, December 7, 2015 5:49 PM
Selecting the Setting of the Centre Indicator
With button 20, you can specify with which accuracy the po-
sition of the laser beam is indicated as central on the recep-
tion area:
– "Fine" adjustment, (indication f on the display),
– "Medium" adjustment, (indication a on the display).
An audio signal sounds when the accuracy setting is changed.
Whenever switching on the laser receiver, the accuracy level
"medium" is set.
Direction Indicators
The bottom g, centre e and top c indicators (both on the front
and rear side of the laser receiver) indicate the position of the
rotating laser beam in the reception area 24. Additionally, the
position can be indicated with an audio signal (see "Audio Sig-
nal for Indication of the Laser Beam", page 21).
Laser receiver too low: When the laser beam runs through
the top half of the reception area 24, the bottom direction in-
dicator g appears on the display.
When the audio signal is switched on, a slow-beat signal
sounds.
Move the laser receiver upward in the direction of the arrow.
When approaching the centre mark 23, only the tip of the di-
rection indicator g is indicated.
Laser receiver too high: When the laser beam runs through
the bottom half of the reception area 24, the top direction in-
dicator c appears on the display.
When the audio signal is switched on, a fast-beat signal
sounds.
Move the laser receiver downward in the direction of the ar-
row. When approaching the centre mark 23, only the tip of
the direction indicator c is indicated.
Laser receiver in centre position: When the laser beam runs
through the reception area 24 at the centre mark 23, the cen-
tre indicator e lights up. When the audio signal is switched on,
a continuous signal sounds.
Audio Signal for Indication of the Laser Beam
The position of the laser beam on the reception area 24 can
be indicated via an audio signal.
After the laser receiver has been switched on, the audio signal
is always switched off.
When switching on the audio signal, you can choose between
two volume levels.
– To switch on the audio signal or change the volume level,
push the acoustic signal button 21 until the requested vol-
ume level is indicated. At medium volume level, the audio
signal indicator d in the display flashes; at high volume lev-
el, the indicator is continuously lit. When the audio signal is
set to off, the indicator goes out.
Automatic Levelling of the Rotational Laser Level
After switching on, the measuring tool checks the horizontal
position and automatically compensates for irregularities
within the self-levelling range of approx. 8% (5°).
When the measuring tool is inclined by more than 8 % after
switching on or after a position change, levelling in is no long-
er possible. In this case, the rotor is stopped, the laser flashes
Bosch Power Tools
and levelling indicator 1 continuously lights up red. Reposi-
tion the measuring tool and wait for it to re-level. Without re-
positioning, the laser is automatically switched off after
2 minutes and the measuring tool after 2 hours.
When the measuring tool is levelled in, it continuously checks
the horizontal position. Automatic re-levelling takes place af-
ter position changes. To avoid faulty measurements, the rotor
stops during the levelling process, the laser flashes and the
levelling indicator 1 flashes green.
Shock-warning Function
The measuring tool has a shock-warning function; after posi-
tion changes or shock to the measuring tool, or in case of
ground vibrations, it keeps the measuring tool from levelling
in at changed heights, and thus prevents vertical errors.
When factory set, the shock-warning function is activated af-
ter switching on the measuring tool (shock-warning indicator
3 lit). The shock warning is activated approx. 30 s after
switching on the measuring tool or switching on the shock-
warning function.
When the levelling-accuracy range is exceeded after a posi-
tion change of the measuring tool or when heavy ground vi-
brations are detected, the shock-warning function is actuat-
ed: The rotation is stopped, the laser flashes, the levelling
indicator 1 goes out and the shock-warning indicator 3 flash-
es red.
– When the shock-warning function has actuated, briefly
press the On/Off button 2. The shock-warning function is
restarted and the measuring tool starts the levelling. As
soon as the measuring tool is levelled in (the levelling indi-
cator 1 continuously lights up green), it automatically
starts in rotation operation. Now, check the height of the
laser beam with a reference point and correct the height, if
required.
When, after the shock-warning function has actuated, the
function is not restarted by pressing On/Off button 2, the la-
ser is automatically switched off after 2 minutes and the
measuring tool after 2 hours.
– To switch off the shock-warning function, press the
On/Off button 2 for 3 seconds. When the shock-warning
function has actuated (shock-warning indicator 3 flashes
red), firstly press the On/Off button briefly, and then again
for 3 seconds. When the shock-warning function is shut
off, the shock-warning indicator goes out 3.
– To switch on the shock-warning function, press the On/Off
button 2 for 3 seconds. The shock-warning indicator 3
continuously lights up green, and the shock-warning func-
tion is activated after 30 seconds.
The shock-warning function setting is stored when switching
off the measuring tool.
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