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  1. Replies
    23$$
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    150902-2130 EDT A correction to my previous...

    150902-2130 EDT

    A correction to my previous resistance measurement of the RR7 relay. The previous measurement was with a Simpson 270 and I had not checked its calibration. That meter reads 44 ohms...
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    23$$
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    150831-1210 EDT junkhound: The new RR...

    150831-1210 EDT

    junkhound:

    The new RR relays are 50 ohms per coil, and 100 ohms for the two coils in series. But only one coil is powered at a time, and they are not used in series.

    Your 34...
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    43$$
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    1,067

    150831-0920 EDT JHZR2: I have been able to...

    150831-0920 EDT

    JHZR2:

    I have been able to trip a Leviton GFCI with a high dv/dt signal, such as switching an inductive load.

    I believe the cause is the Levition circuit board layout. There...
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    6$$
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    150830-1955 EDT chris kennedy: Measure the...

    150830-1955 EDT

    chris kennedy:

    Measure the current that is being switched, and report back.

    .
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    6$$
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    150830-1559 EDT chris kennedy: I believe a...

    150830-1559 EDT

    chris kennedy:

    I believe a 120 V switch is a bad choice for switching low current 5 V DC circuits.

    A suitable switch at this voltage level and lower is a reed, a gold plated...
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    23$$
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    150830-0027 EDT junkhound: How do you avoid...

    150830-0027 EDT

    junkhound:

    How do you avoid burning out a relay coil without some explicit current limiting?

    Using some round numbers assume that a 24 V 30 VA transformer can supply about 1...
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    23$$
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    150827-2236 EDT GerryB: A GE low voltage...

    150827-2236 EDT

    GerryB:

    A GE low voltage switching system that does not have some sort of energy limiter will almost certainly burnout a relay coil if a switch is stuck closed. The GE RR relays...
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    23$$
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    1,100

    150827-1223 EDT wwhitney: There are...

    150827-1223 EDT

    wwhitney:

    There are probably many ways to do this for "one skilled in the art" (Patent Office term).

    How I would perform the function today is probably different than what I...
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    23$$
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    150826-2345 EDT GerryB: If you have the...

    150826-2345 EDT

    GerryB:

    If you have the defective RR7, then check to see if either coil is burned out. A simple resistance measurement will tell you. I measured about 50 ohms per coil.

    If ...
  10. Thread: Non-Linear Load

    by gar
    Replies
    32$$
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    1,098

    150826-0930 EDT The original post indicated...

    150826-0930 EDT

    The original post indicated all three phases had non-linear loads, but the answers assumed that phases B & C were linear. I suspect the non-linear for B and C was a typo and should...
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    23$$
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    150819-2345 EDT I posted a reply around 5 PM...

    150819-2345 EDT

    I posted a reply around 5 PM and it is not here. I will not try to reconstruct my previous comment.

    There is a very logical procedure to troubleshoot this problem. But you must...
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    16$$
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    418

    150813-2351 EDT I have the following...

    150813-2351 EDT

    I have the following suggestion:

    Assume there will be something like a DeWalt radial arm saw with a 12" blade. That is a large inertia load.

    From experience with a saw such...
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    9$$
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    150813-2015 EDT iceworm: I have no idea...

    150813-2015 EDT

    iceworm:

    I have no idea either what he is talking about. My conjecture is as follows as illustrated by a DC circuit:

    Consider two batteries connected in parallel.

    If both...
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    9$$
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    483

    150812-2003 EDT You should be able to use a...

    150812-2003 EDT

    You should be able to use a Stancor RT transformer. See http://www.stancor.com/pdfs/Catalog_2006/Pg_008_10.pdf

    Also look at Signal Transformer. See...
  15. Thread: Shock during fault

    by gar
    Replies
    19$$
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    792

    150811-0826 EDT ptonsparky: If I have two...

    150811-0826 EDT

    ptonsparky:

    If I have two equal diameter wires of the same length, and at the far end I short them together, then the voltage drop on each wire is the same.

    If one wire is...
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    20$$
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    150807-2346 EDT The following is a logical way...

    150807-2346 EDT

    The following is a logical way to accomplish the goal, but I don't suggest that it be used.

    Wire the two lights in parallel across white and black. White is a solidly connected...
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    33$$
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    1,093

    150805-0902 EDT rambojoe: This morning I...

    150805-0902 EDT

    rambojoe:

    This morning I performed the same measurement on the neutral between the two receptacles. The measured voltage at 7 A was 8.6 mV. Close to the hot wire measurement as...
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    33$$
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    1,093

    150804-1251 EDT rambojoe: I have two duplex...

    150804-1251 EDT

    rambojoe:

    I have two duplex receptacles spaced 5 ft apart on the wall in my kitchen eating area. When I built my home 49 to 50 years ago I did the wiring. The receptacles are...
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    33$$
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    1,093

    150804-0023 EDT rambojoe: For most wiring...

    150804-0023 EDT

    rambojoe:

    For most wiring circuits at 60 Hz, and closely spaced wires (think Romex), and you can neglect reactance. Also at these frequencies small diameter wire does not...
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    17$$
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    476

    150803-0723 EDT fifty60: Why would you put...

    150803-0723 EDT

    fifty60:

    Why would you put an un-necessary load on the transformer, and why would you leave an unloaded transformer powered when there is no-load for a long time? You question...
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    17$$
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    693

    150725-0856 EDT Note: the three second cycle...

    150725-0856 EDT

    Note: the three second cycle time. At 8766 hours per year this is 8766*60*60/3 = 10,519,200 cycles per year. The relays in the proposed power supply are very unlikely to last...
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    16$$
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    558

    150722-2112 EDT EdCampbell: See...

    150722-2112 EDT

    EdCampbell:

    See https://reinventingscience.wordpress.com/tag/selenium-rectifier/ . Current rating about 50 mA/sq-cm, or 50 * (1.5 * 2.54) * (1.5 * 2.54) = 50 * 14.5 = 725 mA for...
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    16$$
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    558

    150721-2211 EDT EdCampbell: Looks like a...

    150721-2211 EDT

    EdCampbell:

    Looks like a bridge rectifier.

    I believe terminals 3 and 5 are the DC output. These go to "output to solenoid valve", and "common for solenoid value". My guess is...
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    4$$
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    391

    150715-0959 EDT crazybott19: I quickly...

    150715-0959 EDT

    crazybott19:

    I quickly looked at the data on the WSD PDT 2P at http://www.sensorswitch.com/OnlineCatalog.aspx?sn=WSD%20PDT%202P
    and it looks interesting.

    You need to do some...
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    80$$
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    150705-2332 EDT kwired: Your comments are...

    150705-2332 EDT

    kwired:

    Your comments are basically correct.

    The people in government are writing the laws and regulations, and the car and truck companies have to follow these...
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