Bosch GRL 250 HV Operations Instructions download pdf (Page 13)

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.

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Bosch GRL 250 HV Operations Instructions Page 13

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