Optimizing Sensor Placement and Roller Position in Displacement Guides
This episode is part of the 'Web Guiding Fundamentals' webinar series, focusing on the importance of sensor placement and the location of entry and exit rollers to maintain a 90-degree wrap for optimal control and stability of a displacement guide system. The video discusses how to position sensors close to the exit roller, the effects of web speed on sensor placement, and the consequences of incorrect installation, including bending and oversteering. By following these guidelines, you can ensure smooth operation and avoid unintended consequences like web breaks.
00:00 Introduction to Sensor Placement
00:10 Impact of Sensor Distance on Control Systems
00:23 Effects of Web Speed on Sensor Placement
00:39 Consequences of Incorrect Sensor Installation
01:04 Importance of 90 Degree Wrap
01:16 Avoiding Bending and Distortions
01:32 Oversteering Due to Spread Out Exit Span
01:43 Ideal Sensor Placement Scenario
Transcript
Show full transcript (284 words)
[Music] We don't want to install the sensor too far away or in the next span. This is mainly for control system purposes and stability. When the web guide makes a corrective action, that action is not seen at the sensor immediately. So, if you're running really fast, you might get away with moving these sensors a little further down.
But if you're running slow, whenever this web guide moves here, you would see that motion, if the sensor is as close to the exit roller as possible. If you install it here or here, especially when the web stops and there is a small error, the web guide would keep moving and that might cause the web to break or have unintended consequences. So, we don't want to have the sensor further away or in next span. And we don't even we don't also want to have a scenario where you have an angle that is not 90°.
If you have a 90° wrap, you have twist. As soon as you introduce something which is deviating more from the 90°, you start creating bending in the web. So these kind of bending is going to act as under steering the web. It's going to cause bending that's going to under steer the web and it also causes distortions and guiding stability.
So we don't really want to have any of these conditions. On the contrary, if you have a span exit span that is spread out like this, this is going to over steer the web. It's the bending effect that is causing that and we really don't want to do that. So ideal scenario would be to have a 90°ree wrap in and out.
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