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Automatic Levelling - Bosch GRL 250 HV Professional Originalbetriebsanleitung

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22 | English
To change the rotational speed, press the rotational opera-
tion button (5) or rotational operation button (20) on the re-
mote control until the required speed is reached.
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 (40).
 Line Operation/Point Operation
To switch to line or point operation, press the line operation
button (11) or the line operation button (21) on the remote
control.
The measuring tool switches to line operation with the smal-
lest aperture angle.
To change the aperture angle, press the line operation
button (11) or the line operation button (21) 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.
After the largest aperture angle, the measuring tool switches
to point operation after brief post-pulsation. Pressing the
line operation button (11) again takes you back to line oper-
ation with the smallest aperture angle.
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 (see figure A)
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°.
For this, manually turn the rotation head (10) to the re-
quired position or use the remote control: Press the button
for clockwise rotation (23) on the remote control to rotate
clockwise, and the button for anticlockwise rotation (24) on
the remote control to rotate anticlockwise. In rotational op-
eration, pressing the buttons has no effect.
 Turning the Rotational Plane when in the
Vertical Position (see figure B)
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 vertical axis for easy sighting out or parallel align-
ment in a range of ±8 %.
Press the button for clockwise rotation (23) on the remote
control to rotate clockwise.
Press the button for anticlockwise rotation (24) on the re-
mote control to rotate anticlockwise.
1 609 92A 7AR | (07.02.2022)

Automatic Levelling

Overview
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.
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 status indicator (3) flashes green, the
laser does not rotate and flashes.
The measuring tool is levelled in as soon as the status
indicator (3) lights 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. In this case, the rotor is stopped, the
laser flashes and the status indicator (3) continuously lights
up red.
Reposition the measuring tool and wait for it to re-level.
Without repositioning, 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 and vertical position. Re-levelling is
automatically performed if there are any position changes.
To avoid faulty measurements, the rotor stops during the
levelling process, the laser flashes and the status
indicator (3) 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 positions, and thus prevents errors caused by
a change in the measuring tool's position.
Switching on/activating the shock-warning function:
Press the shock-warning button (2). The shock-warning
indicator (1) lights up green continuously. The shock warn-
ing is activated approximately 30 seconds after the shock-
warning function has been switched on.
Shock warning actuated: If the levelling-accuracy range is
exceeded when changing the position of the measuring tool
or a severe knock is registered, the shock warning will be ac-
tuated. The laser will stop rotating, the laser beam will flash,
the status indicator (3) will go out and the shock-warning
indicator (1) will flash red.
The current operating mode is stored.
After the shock warning has actuated, press the shock-warn-
ing button (2) on the measuring tool or the shock-warning
reset button (22) on the remote control. The shock-warning
function is restarted and the measuring tool starts the level-
ling. As soon as the measuring tool is levelled in (levelling
indicator (3) continuously lights up green), it starts in the
stored operating mode.
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