BCC Read Range Tester
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Contents |
Objective
Design, program and install the read range tester (ARRT) while using the project to cross train Darren. To exceed at this goal: Take the system to the next level of full automation using M4 for automated on-line daily reports.
Milestones
Troy 09:14, 11 July 2008 (PDT)As of today the following parts have been ordered:
- Stepper Motor
- Power Supplies and Cabling
- Micrologix
- The Micrologix will not be used for this project as M4 will not be designed to communicate with Micrologix
--Troy 10:32, 15 October 2008 (PDT) Took unit down yesterday for initial testing of the affect on the BCC transceiver. See discussion notes for details.
--Troy 16:13, 2 February 2009 (UTC)Installed the electronic housing and the first section of the plastic housing. The unit has been running ever 60 seconds since Wednesday the 28th of January.
Troy 14:55, 24 February 2009 (PST) Knowledge is increasing on how to optimize the unit so that it is in the field for a minimal time yet remains reliable. I was able to reduce the time in the field down to 6.03 and ran 4000+ tests with 0 over travels. Currently down to 5.34 sec.
Issues
- Need to determine the pitch or 'lead' of the screw. A 1/2" lead will allow you to push more weight but is slower than a 1" lead.(went with 1 inch)
- Testing to be done on the ATTPS screw when it is replaced.(All testing done on screw intended for ARRT (77" Long)).
- Need to order High Speed Counter card from AB for a SLC 5/05 rack.(Purchased and programmed)
--Troy 10:40, 15 October 2008 (PDT)#ARRT reduces the read range.
- The following are the parameters that were involved and the results of the test.
- Channel: Dry
- Read Range:
- ARRT OFF -3"
- ARRT ON -8"
- ARRT Running @ 10K Pulses/Sec -14"
- It was found that the position of the stepper (river side vs pittag side) may have improved but the noise floor the degradation in read range was the same.
Troy 16:15, 2 February 2009 (UTC)Out of 5700 attempts it failed 1245 at a rate of 125Khz. The rate was reduced to 120Khz and the counter reset around 7:30am 2/2/2009.
Troy 16:15, 2 February 2009 (UTC)A way to mount the unit to the grate is being investigated.
Troy 17:58, 19 February 2009 (UTC) The unit is stalling periodically on the way. Logic has been modified to try and determine a solution.
Troy 11:12, 24 March 2009 (PDT) Several test have been conducted to try and optimize the system. Parameters were found that allow the unit to spend minimal time in the field with out incurring Over Travels. OT's occasionally happen and seem to be temperature related but there is no data to prove that. It has been proven that if the unit is stepped on or bumped while it is in the process of traveling it is more susceptible to OT's.
Troy 14:25, 8 June 2009 (PDT) The unit was removed from service 5/1/2009 and returned to the Kennewick office. The lead screw has proven to be unreliable. New solutions are being pursued.
Useful Parameters
| PLC ADDRESS | Description |
| N10:84 | Home speed MSW 150 = 150k pulses/sec |
| N10:86 | Home Acceleration 100 = 100 pulses/ms/sec |
| N10:87 | Home Deceleration 100 = 100 pulses/ms/sec |
| N10:94 | Jog CW speed MSW(used to send the unit in) |
| N10:96 | Jog CW Acceleration |
| N10:97 | Jog CW Deceleration |
| F8:3 | Stepper minus Encoder |
| F8:4 | Encoder in Inches when tag was read |
| F8:8 | Current position (According to Encoder) |
| F8:16 | +/- of base line when tag was read |
| F8:25 | Time tag is inside shield |
| F8:26 | Time from Home Prox to Home switch |
