Hilti PR 25 Operating Instructions Manual page 11

If the process cannot be completed within a certain period
of time, an error is indicated in the display.
-NOTE- If an error is displayed
Please check that the PRA 25 is positioned within the
inclination range (+/– 5°) and that no obstacles are
located between the rotating laser tool and the laser
en
detector.
7.2.6 Manual alignment with the PR 25
A basic prerequisite for manual alignment is that the
PR 25 is set up accurately. The PR 25 must be set up so
that the correct axis (X or Y) is positioned in the direc-
tion in which alignment is to be performed.
Procedure:
– Position the PR 25 at the reference point and with the
correct axis in the direction in which alignment is to
be performed (the operating range for manual align-
ment is a radius of 5–50 m).
Setting the X-direction manually
– Press one of the X-servo keys twice within 2 seconds.
– The X-servo keys can then be used to perform man-
ual alignment.
-NOTE-
The X LED lights red.
Setting the Y-direction manually
– Press one of the Y-servo keys twice within 2 seconds.
– The Y-servo keys can then be used to perform man-
ual alignment.
-NOTE-
The Y LED lights red.
7.2.7 Manual alignment using the PRA 25
A basic prerequisite for manual alignment is that the
PR 25 is set up accurately. The PR 25 must be set up so
that the correct axis (X or Y) is positioned in the direc-
tion in which alignment is to be performed.
Procedure:
– Position the PR 25 at the reference point and with the
correct axis in the direction in which alignment is to
be performed (the operating range for manual align-
ment is a radius of 5–50 m).
– Check that no obstacles prevent communication
between the PR 25 and the PRA 25.
– Activate the manual alignment function by pressing
the X or Y key twice within 1 second. It is important
that the axes correspond correctly, i.e. when X (Y) is
to be aligned with the reference point, auto alignment
of the X (Y) axis must be enabled by way of the
PRA 25.
8
– The laser beam can be moved to the desired position
by pressing the direction keys. Holding down the direc-
tion keys increases the speed of movement and the
laser line or spot then move continuously.
– The manual alignment function is indicated in the dis-
play by the axis currently being aligned and by sta-
tionary (constantly lit) arrows. An audible signal is also
emitted continuously during the search process.
– The system switches to normal operation when no key
is pressed within 5 seconds. Only the axis that has
been aligned is then indicated in the display.
7.2.8 Monitoring
The monitoring function checks to ensure that no dis-
placement of the aligned plane has occurred (e.g. due
to vibration). If displacement has occurred, the laser
plane is realigned to the zero point (as long as it is still
within the detector target area). An additional laser detec-
tor is required for working with the monitoring function.
A PRA 20 or PRA 25 may be used to detect the laser
beam.
As monitoring begins by way of the auto alignment
function, the PR 25 must be set up accurately. The
PR 25 must be set up so that the correct axis (X or Y)
is positioned in the direction in which alignment is to be
performed.
Procedure:
– Position the PR 25 at the reference point and with the
correct axis in the direction in which alignment is to
be performed (the operating range for auto alignment
is a radius of 5–50 m).
– Position the PRA 25 laser detector at the desired point.
– Check that no obstacles prevent communication between
the PR 25 and the PRA 25.
– Activation of this function requires the PRA 25 to be
switched off. While pressing and holding the X or Y
key (the key for the axis you wish to align), switch on
the laser detector by pressing the on/off key.
– The system is then in monitoring mode. The moni-
toring function is indicated in the display – the LEDs
for the axis to be aligned and the arrows blink alter-
nately.
– The auto alignment process then begins as previously
described.
– The auto alignment process stops as soon as the zero
point has been found. In contrast to full auto align-
ment, no audible signal is emitted at the end of the
process.
– A check is carried out at regular intervals to ensure
that laser plane has not been displaced. If it is found
to have been displaced, the laser plane is again brought
into alignment with the zero point (as long as the laser
beam is still within the detector target area and line of
sight between the rotating laser and the detector has
not been interrupted for a long period). In the event of
prolonged interruption of the line of sight between the
two devices, an error is indicated after 30 seconds.