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  1. markstg

    HOA or OAH switch

    A young engineer has asked a question and I don't have a good answer other than that is how I've always done it. A motor that has an Auto Start function, uses a Hand - Off - Auto, 3 position selector switch. If switch is in Hand (motor running) and it needs to be placed in Auto, if Auto is...
  2. markstg

    4 wire Pt100 probe to 2/3 wire temperature controller

    Connect the 4 wire RTD as a 3 Wire, and use the 3 wire connection at the controller.
  3. markstg

    Blinking Lights

    Waveforms of compressor motor starting.http://files.engineering.com/getfile.aspx?folder=57be974d-4eb4-409e-a994-1525a74990b5&file=Waveforms.docx
  4. markstg

    Blinking Lights

    Attached is the wiring diagram for the ac unit. The hard start kit consist of the start relay (SR) and the Start Capacitor (SC). http://files.engineering.com/getfile.aspx?folder=a3922e1e-bba0-489c-bcbc-c0b0a1c8f096&file=CarrierWiringDiagram.pdf
  5. markstg

    Blinking Lights

    The hard start kit puts a capacitor across the line, not in series.
  6. markstg

    Blinking Lights

    Installed a room with LED lamps, and They Do Not Flicker. If I ever get the wave forms from the Power Company I will post for general interest. thanks.
  7. markstg

    Blinking Lights

    I contacted my neighbors and they are not experiencing flicker. So I'm a lone wolf here. Don't see how I could change my motor in the carrier system condensing unit.
  8. markstg

    Blinking Lights

    Quote Increased current creates additional voltage drop in the transformer and conductors. If the voltage drop is great enough there will be perceptible flicker. In theory, the voltage drop could be reduced to levels that are not noticeable by installing much larger conductors and a larger...
  9. markstg

    Blinking Lights

    @Skogsgurra This is a single phase motor. This is a residential area and single phase is all that is available on the pole.
  10. markstg

    Blinking Lights

    Just because it is a 200A service with a 120A motor start current Does Not mean there must be flicker. Thanks to all who have parcipated in this post, I have learned alot.
  11. markstg

    Blinking Lights

    I found out the manufacturer and type of Power Quality Meter used by the Power Comapany, and their analysis software is free to download. So I requested the PQM file for my house and they said they need to check with the Legal Department to see if they can send me the file showing the PQ of the...
  12. markstg

    Power Factor Correction at motor Terminals. In rush current.

    I'm the OP of "Blinking Lights" and have been following resposes to all the children as I clearly misunderstood the transient behavior of the added capacitor to a starting motor circuit. I haven't been able to stop my lights from blinking, but maybe by adding additional capacitance when the...
  13. markstg

    Blinking Lights

    I made more readings of compressor starting amps with the Hard Start Kit and captured 111A starting current. The power factor correction problem can be analyzed using steady state methods (motor nameplate values, steady state rated power values and phasor arithmetic). The Blinking light...
  14. markstg

    Inductive/Capacitive Inrush

    You are showing that if the amount of capacitance added to bring a running motor's power factor from operating (less than one) to one (what you call PFC current), that this will not effect blinking lights at starting. I agree with that. The question is if the capacitance added is say 5 to 10...
  15. markstg

    Blinking Lights

    I installed a hard start kit (100 microF Cap and voltage relay) on the AC compressor and my clampon read 23A on compressor start, and lights still blink.
  16. markstg

    Blinking Lights

    ScottyUK (Electrical) 27 Jul 14 12:08 Get some proper test equipment and present some measurements of what is happening. All I have is a digital voltmeter and ampmeter. They have min and max functions, but only tell what is expected from a steady state view. I don't have access to transient...
  17. markstg

    Blinking Lights

    I obtained 2 - 100 ufd run capacitors and connected them in parallel to my service. The blinking lights are not noticeable with the capacitors in the circuit when the compressor starts. I did 10 test and unless you are looking directly at the lights the blinking is not perceivable. My test...
  18. markstg

    Blinking Lights

    With the capacitors in the circuit the voltage rises 2V. I, like you, am more concerned with the capacitors in the circuit when I don't need the capacitor KVARS and neither do my neighbors, that my voltage will rise to much, which will have bad effect if not short term, at least long term.
  19. markstg

    Blinking Lights

    I obtained 2 - 100 ufd run capacitors and connected them in parallel to my service. The blinking lights are not noticeable with the capacitors in the circuit when the compressor starts. I did 10 test and unless you are looking directly at the lights the blinking is not perceivable.
  20. markstg

    Blinking Lights

    I don't think the hard start capacitance is large enough to make a difference.

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