40 | English
1 609 92A 4DX | (28.3.18)
Bosch Power Tools
Recommended procedure after an indication to check
calibration
Operating Modes
Orientation of X- and Y-Axis
The orientation of the X- and Y-axis is marked on the housing
above the rotation head.
Rotational Operation
The measuring tool operates with a fixed rotational speed
(600 rpm), which is suitable for use of a laser receiver.
Operating Modes Overview
– Automatic Levelling
after switching on/during operation
– Single-axis Slope Operation
– Centre Line Mode
– Anti-Drift System (ADS)
– Line Control in Vertical Mode (GRL500 HV)
Automatic Levelling
Automatic Levelling after Switching On
After switching on, the measuring tool checks the horizontal
position and automatically compensates for irregularities
within the self-levelling range of approx. 8.5% (5°).
GRL500 HV: Once it has been switched on, the measuring
tool automatically detects the horizontal or vertical position.
To change between the horizontal and vertical position, you
can reposition it without switching it off.
Automatic Levelling during Operation
If after a position change the measuring tool is outside of the
self-levelling range of approx. 8.5 % (5°), levelling is no longer
possible and an error code is displayed (see “Correction of
Malfunctions”, page47).
If the measuring tool is levelled, it constantly checks the level
position. Re-levelling is automatically performed if there are
any position changes. To prevent incorrect measurements,
the rotation of the laser beam stops during the levelling pro-
cess.
Single-axis Slope Operation
When the measuring tool is in the horizontal position, the X-
axis is automatically levelled while in single-axis slope opera-
tion.
The rotational plane can be turned around the X-axis in a
range of ±8.5%.
Note: If you want to perform a slope setting immediately after
switching on, you have to wait for the automatic levelling (see
“Automatic Levelling after Switching On”, page40). This pre-
vents incorrect measuring results.
Slope Setting
Slope setting is possible within a range of ±8.5%.
If the slope range of ±8.5 % is exceeded, the slope mode indi-
cator 41 goes out and an error code is displayed (see “Correc-
tion of Malfunctions”, page47).
Centre Line Mode (see figure D)
In centre line mode, the measuring tool automatically tries to
find the centre line of the laser receiver by moving the rotation
head upward and downward.
Search Sequence:
1. Rotation head pivots upwards to the stop.
2. Laser beam is switched on.
3. Rotation head pivots downwards.
Step
see
page
1
Check levelling accuracy
43
2a
Deviation in 30 m is within the maximum
permitted limits of ±3.0 mm:
Switch off calibration warning indicators 39
2b
Deviation in 30 m is outside of the maxi-
mum permitted limits of ±3.0 mm:
Calibrate measuring tool
44
3b
Check levelling accuracy
43
4b
Deviation in 30 m after calibration is within
the maximum permitted limits of
±3.0 mm:
Work can be performed without loss of
accuracy.
Deviation in 30 m after calibration is still
outside of the maximum permitted limits of
±3.0 mm:
Have measuring tool checked by a Bosch
customer service agent
The out-of-level indicator 37 flashes
during levelling.
/
– Press and hold the slope button 18 or
20 until the desired slope value is
shown on the display.
– Let go of the slope button 18 or 20
again.
The out-of-level indicator 37 flashes dur-
ing slope setting.
The slope mode indicator 41 lights up con-
tinuously.
– Simultaneously press the slope buttons 18 and
20.
Slope setting is deactivated.
Automatic levelling is activated (see “Automatic
Levelling”, page40).
– Press the centre line mode button 19 for approx.
2 s.
Automatic upward and downward movement of
the rotation head starts.
OBJ_BUCH-1960-005.book Page 40 Wednesday, March 28, 2018 11:41 AM
