Speeding Up Centre Line Mode; Anti-Drift System (Ads); Deactivating The Anti-Drift System; Line Control In Vertical Mode (Grl 500 Hv) - Bosch GRL Professional 500 H Originalbetriebsanleitung

40 | English
The out-of-level indicator 37 flashes dur-
ing the search for the centre line.
The indicators for centre line mode 42
light up continuously.
As soon as the laser beam hits the recep-
tion area 26, a beep sounds until the cen-
tre line is found.
The speed at which the rotation head moves will slow down as
soon as the laser beam hits the reception area 26.
When the centre line has been found, the measuring tool au-
tomatically switches off the centre line mode. The set slope is
saved and shown on the display.
– To cancel centre line mode during the search,
press the centre line mode button 19.
or
– Simultaneously press the slope buttons 18 and
20 to activate automatic levelling.

Speeding Up Centre Line Mode

Searching for the centre line always begins with an upward
movement of the rotation head. The direction of the move-
ment can be changed if the position of the laser receiver
above the centre line is known and the laser beam is not yet in
the reception area.
– Press the centre line mode button 19 for approx.
2 s.
Automatic upward and downward movement of
the rotation head starts.
– Press the slope button 20.
The rotation head is moved downwards.

Anti-Drift System (ADS)

The measuring tool has an anti-drift system; after position
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.
The anti-drift system is activated approx. 30 s after
the measuring tool has been switched on.
During activation the shock-warning indicator 38
flashes slowly. The indicator lights up continuously
after activation.
If the vertical position of the measuring tool is changed or a se-
vere shock is registered, then the anti-drift system is trig-
gered: the rotation of
the laser is stopped and the shock-warning indicator 38 flash-
es. In addition, a beep sounds for 5 s on the laser receiver.
2 610 031 676 | (15.7.14)
– Press the On/Off button 17 briefly when the an-
ti-drift system is triggered.
Automatic levelling starts (see "Automatic Level-
ling during Operation", page 39).
– Now check the height of the laser beam against a reference
point and correct the height of the measuring tool if neces-
sary.

Deactivating the Anti-Drift System

The anti-drift system can be deactivated during operation of
the measuring tool.
– Press the On/Off button 17.
The anti-drift system is deactivated. The shock-
warning indicator 38 is no longer displayed.
This setting is not saved when the tool is switched off. The
measuring tool always starts with the anti-drift system acti-
vated.

Line Control in Vertical Mode (GRL 500 HV)

When the measuring tool is in the vertical mode, you can posi-
tion the rotational plane around the Y-axis for simple align-
ment or parallel alignment.
– To turn the rotational plane clockwise, press the
slope button 18; to turn it counterclockwise,
press the slope button 20.
Positioning is possible within a range of ±10%.
The speed at which the rotation head moves begins slowly
and continually increases.

Centre Line Mode in Line Control (see figure E)

In centre line mode, the measuring tool automatically tries to
find the centre line by moving the rotation head left and right.
– Press the centre line mode button 19 for approx.
2 s.
Automatic left/right movement of the rotation
head starts.
Search Sequence:
1. Rotation head pivots right to the stop.
2. Laser beam is switched on.
3. Rotation head pivots left.
4a. Laser beam hits the reception area 26 and finds the cen-
tre line.
or
4b. Laser beam reaches the end of the pivoting range without
finding a reception area; automatic levelling starts (see "Auto-
matic Levelling during Operation", page 39).
The out-of-level indicator 37 flashes dur-
ing the search for the centre line.
The indicators for centre line mode 42
light up continuously.
As soon as the laser beam hits the recep-
tion area 26, a beep sounds until the cen-
tre line is found.
Bosch Power Tools