Bosch GRL 300 HV Professional - Manual (Page 24)

24 | English
1 619 929 J21 | (21.6.11) Bosch Power Tools
Rotational Operation
(150/300/600 min -1 )
Each time after switching on, the measuring tool is in rotation-
al operation mode with average rotational speed.
To switch from line operation to rotational operation, press
the rotational operation button 5 or button 25 on the remote
control. Rotational operation starts with average rotational
speed.
To change the rotational speed, press the rotational operation
button 5 or button 25 again until the requested speed is
reached.
When working with the laser receiver, the highest rotational
speed should be set. When working without laser receiver, re-
duce the rotational speed for improved visibility of the laser
beam and use the laser viewing glasses 38.
Line Operation, Point Operation
(10°/25°/50°, 0°)
To switch to line or point operation, press the line operation
button 11 or button 26 on the remote control. The measuring
tool switches to line operation with the smallest aperture angle.
To change the aperture angle, press the line operation button
11 or button 26 on the remote control. The aperture angle is
increased in two steps; at the same time, the rotational speed
is increased with each step. When pressing the line operation
button a third time, the measuring tool switches to point op-
eration after brief post-pulsation. Pressing the line operation
button again takes you back to line operation with the small-
est aperture angle.
Note: Due to inertia, it is possible for the laser to slightly move
beyond the end point of the laser line.
Rotating the Laser Line/Laser Dot or the
Rotational Plane (see figure A)
When the measuring tool is in the horizontal position, the la-
ser line (in line operation) or the laser dot (in point operation)
can be positioned within the rotational plane of the laser. Ro-
tation is possible by 360°.
For this, manually turn the rotation head 10 to the desired po-
sition or use the remote control: Press button 28 to rotate in
clockwise direction, and button 29 on the remote control to
rotate in anticlockwise direction. In rotational operation,
pressing the buttons has no effect.
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. Rotating is possible only within the
self-levelling range (5° leftwards or rightwards) and only with
the remote control.
Press button 28 on the remote control to rotate in clockwise
direction, and button 29 on the remote control to rotate in an-
ticlockwise direction.
Automatic Levelling of the Rotational Laser Level
Overview
After switching on, the measuring tool automatically detects
the horizontal or vertical position. To change between the
horizontal and vertical position, switch the measuring tool off,
reposition it and switch on again.
After switching on, the measuring tool checks the horizontal
and vertical position and automatically levels out any uneven-
ness 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
and levelling indicator 3 continuously lights up red. Reposi-
tion 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. Automatic re-levelling
takes place after position changes. To avoid faulty measure-
ments, the rotor stops during the levelling process, the laser
flashes and the levelling 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 heights, and thus prevents vertical errors.
To switch on the shock-warning function, press the shock-
warning button 2. The shock-warning indicator 1 continuous-
ly lights up green, and the shock-warning function is activated
after 30 seconds.
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 3 goes out and the shock-warning indicator 1 flash-
es 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 27 on the remote control. The shock-warning function
is restarted and the measuring tool starts the levelling. As
soon as the measuring tool is levelled in (levelling indicator 3
continuously lights up green), it starts in the stored operating
mode. Now, check the height of the laser beam with a refer-
ence point and correct the height, if required.
When, after the shock-warning function has actuated, the
function is not restarted by pressing button 2 on the measur-
ing tool or the shock-warning reset button 27 on the remote
control, the laser is automatically switched off after 2 minutes
and the measuring tool after 2 hours.
To switch off the shock-warning function, press shock-warn-
ing button 2 once, or, when the shock warning is actuated
(shock-warning indicator 1 flashing red) press it twice. When
the shock-warning function is shut off, the shock-warning in-
dicator 1 goes out.
The shock-warning function cannot be switched on or off with
the remote control; it can only be restarted after having actu-
ated.
OBJ_BUCH-757-007.book Page 24 Tuesday, June 21, 2011 10:16 AM