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Measuring
System
On PERFECTA guillotines, the
actual and desired measurements
are displayed on the control panel.
You can choose from four diffe-
rent units. Refer to "Measure-
ment Display" in the Operating
Instructions manual.
The machines are factory-set.
During operation, i. e. while the
backgauge is running, the meas-
urement is automatically moni-
tored.
After 70 travels since the last
check, the control system makes
sure before each backgauge travel
event whether a zero pulse is
expected within the range of 0.5
mm in front of the destination
measurement.
If this is the case, the brake ramp
will be started earlier to be able to
evaluate the zero pulse.
If the zero pulse appears at the
expected position, the travel
counter will be reset and will begin
to count up again.
If no zero pulse is found at the
expected position, the "calibrate
machine first" message will be
displayed.
If 100 travel events have been
done already with no opportunity
to check the measurements, the
next travel which is in excess of 5
mm will be used to begin braking
5 mm in front of the destination
already. Thus, the last 4 mm will
be done at slow speed. Within
these 4 mm, a zero pulse will
appear under any circumstances
(4 mm = one motor turn, one zero
pulse per turn) and can be used
for evaluation.
If the zero pulse appears at the
expected position, the travel
counter will be reset and will begin
to count up again.
If no zero pulse is found at the
expected position, the "calibrate
machine first" message will be
displayed.
1/01 E Service Instructions
Calibrating the
Measuring System
Select the "Calibration" (TV)/
"Factory Calibration" (UC) option
from the service menu.
Type in through the keyboard the
actual measurement between the
knife back and the backgauge
and press the enter key to accept
it. This will change the machine-
internal measuring system to the
value entered. From the actual
position known from the entry, a
forward travel will take place until
a zero pulse is recognised. This
detects and stores the distance
between the last millimeter
measurement divisible by four
(theoretical zero position) and the
first actual zero pulse. Then the
length will be measured to
recognise the machine model/the
cutting width.
Caution: Entering a wrong
actual measurement may lead
to collision as the machine
would expect its end positions
in the wrong places.
You can use a steel rule for meas-
uring to make a rough check and
compare absolutely and relatively
positioned and cut material strips
for a fine check.
Calibrating from the "Settings"
menu will only convert the above-
determined offset between the
theoretical and the practical zero
position to the first zero pulse
after calibration range sensor B39
has been reached. For reasons of
time, no length measuring will be
done.
Important:
Calibrating from the "Settings"
menu will, therefore, only make
sense after previous calibration
from the service menu.
Setting the Proximity
Switches
Adjust front proximity switch B39
so that it is activated at 200 ± 50
pulses (= 2 ± 0.5 mm) below the
measurement of 200 mm (= a
reading of 20000 pulses) while the
backgauge is running forward, i.
e. proximity switch B39 must
become active in the range of
20174 ± 50 at a count of 19974,
for example, for the first zero
pulse below the 20000 mark. Refer
to the "Sensor Test" menu.
Set rear proximity switch B27 so
that it is activated at the dimen-
sion of rear table length + 2 mm.
Adjust both proximity switches
so that distance a between the
proximity switch and the vane is 3
mm (Fig. 27).
Fig. 27
21
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