Hilti PR 25 Manual De Instrucciones página 24

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 Surveillance
The surveillance function checks to ensure that no dis-
en
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 detection area). An additional laser receiver
is required for working with the surveillance function. A
PRA 20 or PRA 25 may be used to detect the laser beam.
As surveillance 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 receiver 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 receiver by pressing the on/off key.
– The system is then in surveillance 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 the 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 detection area and line of sight
between the rotating laser and the laser receiver 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.
-NOTE- If an error is displayed
Please check that the PRA 25 is positioned within the
self levelling range (+/– 5°) and that no obstacles are
located between the rotating laser and the laser receiver.
After successfully setting to the zero point, take care to
ensure that the line of sight between the two devices is
not interrupted.
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Printed: 07.07.2013 | Doc-Nr: PUB / 5070173 / 000 / 00
7.2.9 Pairing
It is possible to configure the PR 25 and the PRA 25 as
a pair. When the two devices are paired, the rotating laser
and the detector are assigned to each other. The rotat-
ing laser then receives commands only from its "own"
detector/remote control unit. The devices can be paired
by pressing and holding down the on/off keys on both
devices simultaneously.
-NOTE-
The PR 25 and PRA 25 are not paired when supplied.
Each unpaired rotating laser receives commands from
any unpaired laser receiver.
Pairing procedure:
– The devices can be paired by pressing and holding
down the on/off keys on the PR 25 and PRA 25 simul-
taneously, as previously described, for more than 3
seconds. Successful pairing is confirmed by an audi-
ble signal emitted by the PRA 25 and by the LEDs on
the PR 25 blinking.
Cancelling pairing:
– Pairing can be cancelled by pressing and holding down
the on/off keys for more than 3 seconds. Cancellation
of pairing can only be successful when the on/off keys
on the PR 25 and PRA 25 are not pressed simultane-
ously. Successful cancellation of pairing is confirmed
by the PRA 25 by the emission of an audible signal
and by the symbol "!" displayed. The PR 25 confirms
cancellation of pairing by causing all LEDs to blink.
7.2.10 Working with the target plate
The target plate improves visibility of the laser beam.
The target plate for the PR 25 is particularly useful in
bright conditions or wherever better visibility of the laser
beam is required.
7.2.11 Working with the laser receiver
Please refer to the PRA 25 operating instructions for
information about the laser receiver.
7.2.12 Continuing work in manual mode after a
restart
In order to continue working in manual mode after a
restart, it is necessary to press one of the "servo" keys
on the PR 25 within 3 seconds.
7.2.13 Returning to standard mode
To return to standard mode, switch the tool off and then
restart it.