Voir la source de SZ Axis Bottoming Out on Autoflow

{{Tuto Details
|Description=<translate>This page describes the diagnostic processes to go through to check if an Autoflow SZ axis is getting jammed with swarf at the bottom of its travel</translate>
|Categories=Maintenance
|Tags=SZ Axis, Swarf, Error 76
}}
<translate>= Problem =
A regular issue on an Autoflow is the SZ axis getting blocked by swarf. The blade datums at a position around -17mm down from the saw blade table, and then moves to a "safe" position of around -27mm below the tabel. This "-27mm" distance is controlled by the "moveAfterDatum" parameter on the Axes tab.


It is common for swarf to build up and to keep getting compacted so that the axis cannot reach the -27mm lower limit. This can be a progressive problem, getting worse a tiny bit day by day.


The axis will try its hardest to overcome the swarf and will lead to a few different symptoms:

* Error 76 - Drive Error on SZ axis
* Press Start to initialise, but then no Start to begin cutting message
* SZ axis motor excessively hot
* SZ Axis motor failure

= Checking for this issue =
It is important to understand how to check if this issue is happening, as it is easy to ask the operator to clear the swarf, and they can promise they have done it, but the problem still remains.
<br />

=== Checking Required Position vs Actual ===
Checking the moveAfterDatum position against the actual axis position is one way of doing this. 



The moveAfterDatum position is found on the axes tab (in this case -27)
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The Drives tab (from Settings window) shows the actual position of the SZ axis (in this case -27)
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In the above case: Required = -27 and actual=-27, therefore the axis is not bottoming out. if the numbers are different, there is a blockage creating a problem
<br />

=== Checking Motor Temperature ===
Obvious way is to touch the motor! If this is not possible, or a more scientific test is required, the motor temperature is fed back to the Drive Manager tab on the TwinCAT system.
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Click on Drive Manager (1) and Watch Window (2)

The motor temperature for the SZ axis (3) can be compared to the temperature of the SR axis (4)


They should be pretty much the same.


In this particular case, the SZ axis temperature was 68 degrees - which would be too hot to touch, the SR is room temperature - -20.9 deg







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