Automatic Levelling - CST/BERGER AL Serie Manual Original

Aligning the Rotational Plane in the
Vertical Position
When the measuring tool is in the vertical position, it
is possible to rotate the laser point, laser line or rota-
tional plane around the Y-axis for easy sighting out or
parallel alignment.
Rotation is possible within a range of ± 10 %.
After switching on in vertical position, "CCW CW/
SWEEP POS" (rotation in counterclockwise or clock-
wise direction/line positioning) is indicated on the dis-
play. Align the rotational plane by pressing selection
button 8 above "CCW" (rotation in counterclockwise
direction) or selection button 4 above "CW" (rotation in
clockwise direction).
To exit the menu, press function-mode button 7.
The alignment of the rotational plane is retained
regardless of whether rotational operation, line opera-
tion or point operation is set afterwards.
To change the alignment of the rotational plane,
switch back to the "SELECT/SWEEP POS" menu
by pressing function-mode button 7.

Automatic Levelling

The automatic levelling and the shock-warning func-
tion can be switched on and off on the measuring tool.
Press function-mode button 7 until "SELECT/
AUTOLEVEL" (selection/automatic levelling) is indi-
cated on the display. Then press the left selection but-
ton 8. The setting indicated at the top of the display is
active and can be changed by pressing the left selec-
tion button.
The following settings are possible:
– "ADS" (shock-warning function): Automatic level-
ling and shock-warning function switched on.
– "ON": Automatic levelling switched on, shock-
warning function switched off.
– "OFF": Automatic levelling and shock-warning
function switched off.
When the desired setting is indicated, press the func-
tion-mode button 7 to save the setting and to exit the
menu.
Shock-warning Function ("ADS")
The measuring tool has a shock-warning function;
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 pre-
vents vertical errors.
Note: When the measuring tool is in horizontal posi-
tion, only not-inclined axes are monitored. When two
axes are inclined, the shock-warning function is deac-
tivated. When one axis is inclined and the other not,
the not-inclined axis is monitored. Position changes
exactly alongside the inclined axis are not detected.
2 610 A15 112 • 12.8.09
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When factory set, the shock-warning function is acti-
vated after switching on the measuring tool. The shock
warning is activated approx. 60 s after switching on the
measuring tool or switching on the shock-warning func-
tion.
When the levelling-accuracy range is exceeded after
a position change of the measuring tool or when
heavy ground vibrations are detected, the shock-
warning function is actuated:
"CONT/UNIT UNLEVEL" (continue/measuring tool
out of levelling range) is indicated on the display. The
rotation is stopped and the laser flashes in point oper-
ation. The current operating mode is stored.
After the shock-warning function has actuated, press
the right selection button 4 above "CONT" (continue).
The shock-warning function is restarted and the meas-
uring tool starts the levelling. As soon as the measuring
tool is levelled in, 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.
The shock-warning function can also be set in such a
manner that it is not automatically switched on when
switching on the measuring tool. Switching on the
function at a later point of time is of course possible.
To change the standard setting of the shock-warning
function when switching on the measuring tool, pro-
ceed as follows:
With the measuring tool switched off, press and hold
the right selection button 4 while switching the meas-
uring tool on.
Working with Automatic Levelling ("ON")
After switching on, the measuring tool checks the hor-
izontal and vertical position, and automatically com-
pensates irregularities within the self-levelling range of
± 5°.
When the measuring tool is inclined by more than 5°
after switching on or after a position change, levelling
is no longer possible. The rotor is stopped and the
laser is switched off. If the grade alongside the Y-axis
is too steep, "ERROR/Y TOO STEEP" is indicated
on the display. If the grade alongside the X-axis is too
steep, "ERROR/X TOO STEEP" is indicated on the
display.
In this case, switch the measuring tool off, re-align it
and switch the measuring tool on again. If the measur-
ing tool is not re-positioned, it is automatically switched
off after 2 minutes.
When the measuring tool is levelled in, it continuously
checks the horizontal and vertical position. Automatic
re-levelling takes place after position changes. If the
measuring tool cannot be re-levelled after 3 seconds,
the rotor is stopped during the levelling procedure to
avoid faulty measurements, and the laser flashes. The
shock-warning function remains active.
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