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Auto-levelling system
The 686PT is fitted with an automatic sheet levelling system. An optical sensor directs a beam of infrared
light across the machine. The system comprises of a transmitter and receiver. When the beam is broken air
is pumped into the machine cabinet under the plastic lifting it until beam transmission is re-established. The
optical sensors are located under the top-frame at the sides.
It is important the transmitter beam is directed at the receiver. Adjustment may be carried out by slightly
bending the sensor mounting plate to ensure alignment. The receiver LED’s will show red when broken or
misaligned and green when OK.
For transparent materials it is possible that the sensors will not operate correctly as the infrared will pass
through the material. In such cases an optical attenuator is available that will create a narrow beam and
reduce the sensitivity. Contact Formech if an attenuator is required.
How to check the auto-level sensor
Fault Diagnostics / Maintenance
Bring the clamping frame down and the heater
slightly forward from the back position to enable
the auto-level.
Activate the auto-level on the touch-screen, place
your hand in the center of the aperture and move
it up & down until you hear the air valve turning
on and off.
If the auto-level air valve is constantly blowing it may be due to misalignment or an accumulation of dust on
the front of the sensor. Check the alignment and / or inspect for lens cleanliness and check again. If the air
valve does not function with the test above, inspect the device lenses for heat damage and also refer to the
state of the indicators on the receiver. If it is still not working, please contact Formech.
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