Press Bdc Detection Mode - Panasonic GP-X Series User Manual

3.4.3 Press BDC Detection Mode: "

The deviation amount in the reference position (bottom dead center; BDC) of
a press or the like is measured and, upon deviation of the reference position
beyond the specified tolerance, judgment is output.
After the "BDC detection mode" is selected, the measuring conditions are set
in the following way.
・The holding measurement mode is fixed at bottom hold.
・The trigger condition is fixed at the internal falling edge trigger.
・The trigger delay and sampling time are set at zero.
To use the external trigger, select the "manual mode" and enter settings.
You can select whether a comparison with the previous mean is valid or
invalid.
*With a comparison with the previous mean, slow variations in the reference
bottom dead center caused by temperature changes and aging is ignored
and abrupt changes (empty stamping or floating caused by burrs) is
detected while the average bottom dead center up to the previous cycle
is referred to (zeroed). The function is only valid when bottom hold and
internal falling edge trigger are selected. For details, refer to section "3.6
Comparison with Previous Mean" on page 66.
Example of detection of bottom dead center
1) Mount the sensor head on the lower die of the press and mount the
detecting object on the upper die. Prepare the sensor head mounting
fitting and an object to be detected.
2) Adjust the position of the sensor head and that of the object to be detected.
1. Select the material according to the object to be detected.
Reference
For selection of the material, refer to section "4.1 Selection of Object to
Be Detected" on page 70.
If the object is made of iron, select "FE". The factory shipment setting of
GP-X series is stainless steel (SUS304).
2. At the reference bottom dead center position, adjust so that the distance
between the sensor head and the object to be detected becomes the center
(halfway position) of the detection range. Adjust while observing the distance
displayed on the controller.
3) In the reference position,
press the
zero setting.
"0.0000" is displayed in the
reference position.
・With the zero setting in the bottom dead center mode, the bottom hold
value is zeroed. This is convenient if the pressed point is made the datum.
・To cancel the zero setting, restore the default settings of the application
mode first.
・If the trigger level exceeds 110% of the detection range in respect to the
detection distance to be designated as a zero point, the value may be
clipped. In this case, set the trigger level again after designating the zero
point.
key to perform
" (press)
Press .
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