Laser Mech FiberMINI 2.0 - Status (Digital Output); Calibrate (Digital Input)

PLMNL0243 REV. A, Effective Date: 03/24/16 11 FiberMINI ™ 2.0 Operation Manual
3.4.6 Status (Digital Output)
The Status output is a handshake
for the calibration input (CAL). When
the sensor is requested to calibrate,
this signal will become active. Upon
completion of the calibration, this
signal will deactivate (takes less
than 0.5 seconds).
 If the sense circuit to the tip is
shorted, Status will not become
active after the request for
calibration.
 If the sense circuit is open,
Status will remain active for 1-2
seconds after the request for
calibration.
3.4.7 Calibrate (Digital Input)
The Calibrate input is a request for
sensor calibration. The calibration
should take place with the tip about
12mm away from a grounded
metallic surface at least 100mm in
diameter. The calibration must be
performed at power up and
preferably every cycle.
Note: It is recommended the tip
be calibrated every time the
head is in a retracted
position. The calibration
procedure takes ~150ms and
will ensure proper tip standoff
is maintained.
 Calibrating at a standoff greater
than 12mm distances will result
in standoff readings that are
slightly less than the optimum
level.
 Calibrating at a standoff less
than 12 mm will result in
standoff readings that are
slightly more than the optimum
level.
The height sense electronics are
designed to operate with dynamic
stability control of the nozzle
standoff.
 Nozzle standoff control is
achieved by:
o Resetting the calibration as
frequently as possible.
o Resetting the calibration
before there are any
significant changes in any of
the environmental
conditions.
 Nozzle standoff control is stable
through varying environmental
conditions, such as
temperature, humidity and
cutting debris deposits.
 Dynamic control is more
effective than methods that try
to passively stabilize the
standoff.
Calibration pulse frequency varies
with each process and machine. It is
very important to recalibrate the
head more often than environmental
changes occur.
The best practice is to recalibrate the
head every time it is moved away from
the part.
 If the head is in a retracted
position for an extended period
of time, send the calibrate pulse
again before moving the head to
the work piece.
 It may not be possible to send
the calibrate pulse often enough
due to very long cuts, or highly
reflective materials. In that case,
it may be necessary to add
some basic passive
stabilization, such as available
air or water cooling to the tip
assembly or head.