ilsk8

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About ilsk8

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  • Birthday 04/07/75

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  • Location Being hunted for scientific research

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  1. Which laptop is most commonly used by PLC Service Engineers? Specs please :)
  2. AC SCRs

    Hello there :) I hope the attached doc is of any use explaining a bit. As far as firing SCR's, IGBT's, Triacks the most common way of sending gate pulses to the device is PWM. If you type PWM into google you will find a load of realy good information on the subject, or othwize just click the link below :) http://www.solorb.com/elect/solarcirc/pwm1/ http://www.cpemma.co.uk/pwm.html I have built the first circuit and works very well for messing about with. As you will read the PWM circuits adjust the duty cycle of the current/voltage being sypplyed to the end device. For medium frequency converter and resistance welders this is not how it is done, as there is another step to perform by the electronics first. From the PWM circuit a pulse of say 8 to 10 usS is crated and the the frequency of the waveform is modified so that the periodd petween the pulses are shortened or lengthend depending on the frequency required for a inverter for example. For your welder it is probably the phase firing or closed loop control mentioned in the doc. As sugested a current probe attached to a oscilliscope measuring the pulses across the device wile being referanced to the incomming supply of the controling electronics board is a good way of fault finding as that is one of the steps I perform when checking three phase rectifires. Phase_control.doc
  3. China

    Hi there J Have spent the last couple of months working and travelling to and from China and have found it not a problem and am soon to go back next month. If you are travelling alone make sure you have your routes planned out in advance and have instructions to places written in Chinese and English, as the taxi drives do not speak any English. Also a mobile phone with a contact number of someone who can speak English is a great help. At the hotel receptions pick up the hotel card, as it will have a “please take me to my hotel” written on it. Talk to the bell hops and reception as they speak excellent English and are a good source of help and information on what to do and how to get there. Mobile networks Not a problem for American networks as I worked with an American college who had no problem using his phone. I hope you like spicy food. Speaking as a fussy eater, I loved it and tried everything that was put in front of me. Money Cash machines every where. Best advice. Always carry toilet paper with you at all times, you can laugh now reading this but you won’t be laughing later as you will get caught out at some point. Pubs and clubs As there are loads of German car plants in and around shanghai, some clever fella opened an excellent German theme bar, with good food, beer and live music every other night and is well worth a visit. (Cant remember the name, to much beer) Also you got to love the Irish as they have set up camp too and you can live on Guinness alone if you don’t like the food J
  4. OverTime Pay Questions for everyone

    Hello all, Been a student for the past 3 years and have now rejoined the full time working life and all the fun stuff that comes with it. I work as an overseas engineer on an hourly rate, so for an average week in the office back in the UK, it’s a 39hr with no week end work needed. If I work away in the UK or overseas, I get a nightly overnight commission. If I work overtime I must work 10hrs before it gets paid at a time and a third, any weekend work gets paid at the usual of time and a half and double time. Also I get a monthly car allowance so I have no excuse but to turn up on time to work. The previous overseas job I had was a salaried 39hr, overnight commission, no car allowance and did not pay any overtime except for Sundays, home or away. Used to work from 8 till 8 depending on the state of the job, but tried to keep it to 8 till 5 when working away, leaving the weekend free for R&R. So I am on a better number now and am just glad to get a decent job so soon after UNI.
  5. plz help meeeee....

    Hi there, looks like we both have been doing the same type of project, except mine was for a disabled, aged person point of view. i.e. to simplify the homes controlling systems and offer some remote interaction. You may want to check out some of the links and company names below for some ideas on what you’re in for. Schneider Electrical: - Transparent Building (excellent information) Siemens: - Home automation Kit (very nice, sweet) Creston (very nice, very expensive) Slam these company names and titles into Google and I’m sure you’ll get the right inspiration.
  6. XFRB instruction

    Sorry read the wrong instruction.
  7. XFRB instruction

    using the help file attached to my ladder edditor, it tells me that the CPM range of plc dose have the block transfer function.
  8. CPM1A - memory backed up

    Depending on what editor you are using? CX-Programmer or Syswin, they both have DM, Timer, Counter, I/O editors as well as the ladder editor so that the values and settings can be saved for multiple programs. I learnt the hard way by losing DM and Timer values by not saving the DM as well as the Ladder every time I would try a new program to experiment on my own CPM1A. As far as the MOVE function, that’s all it dose is move DM values around the DM area and is still governed by the supper capacitor 20 day or more memory.
  9. Humor

    1. The sport of choice for the urban poor is BASKETBALL. 2. The sport of choice for maintenance level employees is BOWLING. 3. The sport of choice for front-line workers is FOOTBALL. 4. The sport of choice for supervisors is BASEBALL. 5. The sport of choice for middle management is TENNIS. 6. The sport of choice for corporate officers is GOLF. CONCLUSION: The higher you are in the corporate structure, the smaller your balls become.
  10. Humor

    From a strictly mathematical viewpoint it goes like this: - What makes 100? - Ever wonder about those people who say they are giving more than 100%? - We have all been to those meetings where someone wants you to give over 100%. - How about achieving 103%? Here's a little mathematical formula that might help you answer these questions: If: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z is represented as: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 Then: H-A-R-D-W-O-R-K 8+1+18+4+23+15+18+11 = 98% and K-N-O-W-L-E-D-G-E 11+14+15+23+12+5+4+7+5 = 96% But, A-T-T-I-T-U-D-E 1+20+20+9+20+21+4+5 = 100% And, B-U-L-L-S-H-I-T 2+21+12+12+19+8+9+20 = 103% AND, look how far a$$ kissing will take you: A-S-S--K-I-S-S-I-N-G 1+19+19+11+9+19+19+9+14+7 = 118% So, one can then conclude with mathematical certainty that: While hardwork and knowledge will get you close and Attitude will get you there, Bullshit and a$$ kissing will put you over the top!
  11. electronics project using PLC

    Very nice like that a lot.
  12. electronics project using PLC

    How about building or using the on board pulse width modulator to control the speed of a small 24v d.c. motor. The code will allow ramp up and down of the motor from interaction with an encoder. You can use a OMRON photoelectric device EE-SY310/-SY410 (under a£5) to be the encoder as it has 24v switching capabilities (if you are in the UK it is available from RS) For a motor check out MFA/Como Drills, because you can by a small gearbox motor for under a £10 with a wide range of operating voltages and gear rarios, either from maplin electronics or RS (UK only I think)
  13. The more I learn...

    Hum!!!! Just a little clear up hear that’s all. The program supplied at the top of this thread if anyone noticed (still uses SYSWIN that is as every one now has CX-Programmer), is installed with Syswin as series of 3 different examples of ladder logic, and yes very messy. Therefore, written by some OMRON Eng a many years ago me thinks. Ta Ta
  14. LLOKING FOR BOOK HELP!

    Look here http://www.mikroelektronika.co.yu/english/...ook/plcbook.htm
  15. Communication trouble

    Thanks for the replies. Had sleep and plenty of it.