Ok back again, after numerous trials here is a summary which I hope help endevours of someone trying to implement positioning without the use of servos.
1. Light arrays as measuring device are not suitable for this kind of applications (do not want to mention model and or manufacturer) as they...
Setup is as folows 1 main PLC rack with 1 1756-EN2T module which will communicate with 16 Point IO (1734-AENT) 12 out of these are with the 1734-VHSC, communication setup is autonegotiate.
At the begining we have periodic tasks but we have now the encoder routines on a continuos loop in the...
Thanks again Skogsgurra, I have already check on the filter options, and that's why I am working to get the oscilloscope, with the different options (except for the 50 Hz which basically filter my application frequency rate) is doing what I described in my post of 2 Jan 12 12:17 and agree with...
Thanks Skogsgurra you don't bother me at all as I appreciate all contributions and/or comments answering your question I do not have an scope to check how the pulses looks like since I am new I am trying to get my manager help me borrow an scope from any of our supply vendor to check on this...
Thank you Dan Stewart,
Please bare with me on this, facts:
-Conveyors belts are already designed for the product we are handling with no servos on it, in other words I have to make it work, mechanical eng is confident on us to make this work (as usual right?).
-There is one thing happening...
Thanks Skogsgurra, not clearly understand your question about Time contanst filter, there is a filter selection frequency which gives you 50 Hz, 500Hz, 5 kHz, and 50 kHz for CH A and CH B is this what you refer to?
Last couple of things today:
- Connect Channel B and configure for X4 Encoder to have 800 PPR (X1 = 200 PPR) this gives me about 36 Pulses Per Inch
- Created a program to Start the Conveyor to advance 12 inches at 40 ft/min (about 20 Hz VFD frequency)
Result is that is always off for about...
Ok so far this is what I have done:
- Relocate Light array or curtains (LC) Photo-eyes back about 1/2"
- Deccel time on the VFD (Powerflwx 40P) to 0.0
- Took one link out of the belt conveyor to avoid from travel after Stop commanded
- Slow down the conveyor in which the product is going to...
Thanks for all replies, application is open loop, we count pulses and based on that we calculate the position to stop to get it centered, slip is one factor affecting the position, other is the mean of measure sometimes it tells you the right size and sometimes is sligthly deviated down, in...
Hi, I have a project in which we are using a Light Array photoeye to detect leading and trailing edege to size the product (22" to 39") and center it on a conveyor which is 4 ft long. Once the leading edge of the product is detected we capture encoder pulses (AB 845-DZ32BCH-C 200 Pulses por rev...
