Bosch Professional GRL 350 HV Instructions Manual page 12

12 | English
Rotational operation/point operation
Each time after switching on, the measuring tool is in rota-
tional operation mode with standard rotational speed
−1
(300 min ).
To switch from line operation to rotational or point opera-
tion, press the rotational operation button (4) or the rota-
tional operation button (26) on the remote control.
To change the rotational speed, press the rotational opera-
tion button (4) or rotational operation button (26) on the re-
mote control until the required speed is reached. The rota-
tional speed is gradually increased each time after pressing
the button. After the highest speed setting, the measuring
tool switches to point operation after brief post-pulsation.
Pressing the rotational operation button takes you back to
rotational operation with the lowest rotational speed.
When working with the laser receiver, the highest rotational
speed should be set. When not working with the laser re-
ceiver, reduce the rotational speed for improved visibility of
the laser beam and use the laser googles (46).
Line mode
To switch to line operation, press the line operation
button (16) or the line operation button (30) on the remote
control.
To change the aperture angle, press the line operation
button (16) or the line operation button (30) on the remote
control until the required operating mode is achieved. The
aperture angle is gradually increased each time it is pressed;
at the same time, the rotational speed is increased with each
setting.
Note: Due to inertia, it is possible for the laser to slightly
move beyond the end point of the laser line.
Functions
Turning the Line/Point in a Horizontal Position within the
Rotational Plane
When the measuring tool is in a horizontal position, the laser
line or the laser point can be positioned within the rotational
plane of the laser. Rotation is possible by 360°.
To rotate anticlockwise, press the slope button down (5) on
the measuring tool or the button for anticlockwise
rotation (23) on the remote control.
To rotate clockwise, press the slope button up (15) on the
measuring tool or the button for clockwise rotation (33) on
the remote control.
Turning the Rotational Plane When In the Vertical
Position
When the measuring tool is in the vertical position, it is pos-
sible to rotate the laser point, laser line or rotational plane
around the X-axis for easy sighting out or parallel alignment
in a range of ±8 %.
To rotate anticlockwise, press the slope button down (5) on
the measuring tool or the button for anticlockwise
rotation (23) on the remote control.
1 609 92A 69Y | (23.04.2021)
To rotate clockwise, press the slope button up (15) on the
measuring tool or the button for clockwise rotation (33) on
the remote control.
Automatic levelling
Overview
After switching on, the measuring tool checks the horizontal
and vertical position and automatically levels out any un-
evenness within the self-levelling range of approx. ±8 %
(±4.6°).
During levelling, the X-axis (7) and Y-axis (6) status indicat-
ors flash green and the laser flashes in point operation.
The measuring tool is levelled as soon as the X-axis (7) and
Y‑axis (6) status displays light up green continuously and the
laser lights up continuously. After levelling is completed, the
measuring tool automatically starts in rotational operation.
When the measuring tool is out-of-level by more than 8 %
after switching it on or after a position change, levelling in is
no longer possible. If this is the case, the X-axis (7) and Y-
axis (6) status indicators will flash red, the rotor will be
stopped and the laser will be switched off.
Switch the measuring tool off, position it as level (horizontal
position) or perpendicular as possible (vertical position) and
switch it on again.
Position Changes
When the measuring tool is levelled in, it continuously
checks the horizontal and vertical position. Re-levelling is
automatically performed if there are any position changes.
Minimal position changes are levelled out without inter-
rupting the operation. This automatically compensates sub-
soil ground vibrations or weather influences.
For larger position changes, the rotation of the laser beam
will be stopped and the laser beam will be stopped in order
to avoid incorrect measurements during the levelling pro-
cess. The X-axis (7) and Y‑axis (6) status indicators will flash
green. The shock-warning function will be actuated, if re-
quired.
The measuring tool will automatically detect the horizontal or
vertical position. To change between the horizontal and
the vertical position, switch the measuring tool off, reposi-
tion it and switch it on again.
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 positions, and thus prevents errors caused by
a change in the measuring tool's position.
Activating the shock warning: The shock-warning function
is switched on by default. It is activated approximately
one minute after the measuring tool has been switched on.
Shock warning actuated: If the position of the measuring
tool is changed or a severe knock is registered, the shock
warning will be actuated. The laser will stop rotating and the
laser beams will flash. At the same time, the shock-warning
indicator (13) and the X-axis (7) and Y‑axis (6) status indic-
ators will flash red. The current operating mode is stored.
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