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  1. foretmark

    what's on the lightpost?

    I was visiting a home in a new subdivision yesterday and on one of the lightpoles there was a device I could not identify. It appeared to have a small solar panel on one side of a nema rated looking sealed box with 4 rods (antennae?) coming out of it, 2 up, 2 down. I have no idea what this...
  2. foretmark

    Non PV power into charge controller

    How would a charge controller generally used to charge batteries with a solar panel input know or care whether the input voltage was being generated from solar power or by a different source? I'm told it can't /shouldn't be done, but I don't know why. As far as I know, the voltage out of a...
  3. foretmark

    surge protection

    What would you guys suggest as the most reasonable way of protecting against the effects of a lightning strike and or residual transients to equipment? I've already suggested using a groundrod tied to the chassis and with minimal travel path from unit EG connection point to the rod. There are...
  4. foretmark

    batt charger batt type

    Why would a 'smart' battery charger care what type (lead acid, gell, etc) of battery it is charging? Wouldn't the demand be dictated by voltage level reguardless of material?
  5. foretmark

    60Hz motor at 50Hz again....

    I know much has come up about this, but I haven't seen any answer to the question of, if I'm going to put a 60Hz motor into service with a 50Hz supply, in order to get the V/Hz ratio down by reducing the voltage...is there any 'voltage divider' way of doing it...in other words, without a VFD or...
  6. foretmark

    editing logo parameters

    SIEMENS LOGO 12/24RC...0BA6....LOGO Soft Comfort V6.1.5.... The manual for the above is very unclear on navigation as far as editing an existing program on a LOGO. I have a timer I'd like to change the retentivity on at the LOGO. After several hours of working with it, I think I'm close...
  7. foretmark

    painfully loud motor

    Is there any electrical mechanism that I'm just not able to figure out that would cause a motor running under typical conditions to make an exceptionally loud noise under load? I'm fairly certain it's mechanical, but I'm being told it could be electrical and I just want to rule out anything...
  8. foretmark

    siemens logo upgrade

    Siemens upgraded their LOGO! smartrelay to version 0BA6 from 0BA5. There are only a couple of minor additions, however the little memory chip that allows quick and easy program upgrades is not compatible according to Seimens. They informed me however that the new LOGO should be able to read the...
  9. foretmark

    current at 50Hz on modified 60Hz motor

    I am taking a single phase 5HP 60Hz motor running at 220v and changing the centrifugal switch spring so it will start at 50Hz (for outside of US). I'm told by the manufacturer that this is all that need be done. The V/Hz has gone up from 3.7 to 4.4, but I cannot drop the voltage down any. It...
  10. foretmark

    ideas for testing 50Hz motor at 60Hz

    3 HP singlephase 220v 50Hz motor Only have 208v 1 & 3ph and 480v 3ph available (280 L-N). Doing the math for the motor, I get a V/Hz of 4.4. I get 3.5 for the 208/60. My load is a hydraulic pump, charging a vessel that shuts off at a set pressure. To test this, I only need to run it for...
  11. foretmark

    120 from 1ph 230

    Is it 'illegal' to take one leg of incoming 230v single phase and ground to energize a 120v motor contactor coil to switch a 230v motor?
  12. foretmark

    simple transformer dc

    In order to get 24VDC using a transformer, I'd like to take a 16v transformer, rectify it and put a capacitor across the lumpy DC (after the rectifier of course). Obviously using a 24v transformer, I'll end up with almost 40VDC. For a 100VA transformer, I have roughly 4a available to me at...

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