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  • Users: Shiju
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  1. Shiju

    Changing Job

    My desire to earn more salary made me land in Middle East leaving back my job in R & D of a manufacturing company in India where I worked for 2 years.The job I got here is in the Sales field which was very new for me but I took a chance......Being in Sales one deserves to be more aggressive and...
  2. Shiju

    HID Ballast Circuit - Kirchoffs Law

    Cbarn, its the PF capacitor i have accounted... pls. note these arent measured values...im going by the theory....
  3. Shiju

    HID Ballast Circuit - Kirchoffs Law

    Hi Again, Yes, Cbarn the ballast is just a choke in this case, the ordinary reactor type not the Autotransformer type. If PF is considered as Steve suggests For a PF of 0.85, Lamp wattage = 1000W, Ballast loss = 50W Input Current, Ip = (1000 + 50)/(230*0.85) = 5 .37 A As HID lamps operate at...
  4. Shiju

    HID Ballast Circuit - Kirchoffs Law

    Hi All, its understood that HId lamps operate at 110V while its running, eventhough the i/p supply voltage is 230V...........the remaining voltage being dropped across the ballast. Now what confuses , is the current drawn by the lamp and the input current. for example.. if the lamp...
  5. Shiju

    Supply voltage

    Why is that supply voltages have been standardised to 230/240/250V...ALso in America we find it is different in different regions, 120/240/277...what are the advantages of this?Also does the frequency play role in our household equipments like tv,refrigerator...
  6. Shiju

    I would like to know if there is an

    dear scottyuk/jbartos, well my idea is to run the synchronous motor at two speeds.we have both 12v/120V 60 Hz ,2/3 W syn motors. We are thinking of rotating this motor at 6rpm during the first on and after one more on should rotate at 2 rpm synchronosly with the other units connected.The motor...
  7. Shiju

    Ballast Protection

    I need some help regarding the design of CWA ballasts. There are different tappings on the primary of the ballasts e.g.120 V,230 V,277 V etc. On the secondary the HPS lamp is connected via a capacitor. B'cos of current limiting an insulation fault in the secondary coil results in a slow build...
  8. Shiju

    New To PLC

    I hope to get a book by Petruzella soon.Thank you PLCSAVVY for the information. I have downloaded PlC ladder logic from mrplc.com.Now I am familiarised with drawing ladder networks.Chris would you please advise what should be the next step.
  9. Shiju

    Capacitor Selection

    Dear M3, Thank You very much for your suggestion. Regards Shiju
  10. Shiju

    Capacitor Selection

    I have a circuit which is used to control a 12 V dc ,3W ,stepper motor using PIC.The input supply is 120 V ac,60 Hz which is then reduced to 12 V using capacitor as impedance. The electrolytic capacitor used after the bridge is 470 mfd,25 V. Now I have decided to run the motor by taking 12 V...
  11. Shiju

    I would like to know if there is an

    Thank You very much for the information.
  12. Shiju

    I would like to know if there is an

    I would like to know if there is any method by which speed of a 120VAC,60Hz,2W,2rpm synchronous motor be changed .

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