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  1. cygnusv

    How to control the speed of a 24vdc pump from circulating water temperature?

    Hi Chris This is all looking good. For now (at least) there is just the question of what appears to be a connection between the red and white wires at the pot. The two connections are very close together so I want to confirm that the 'apparent' connection shown in your circuit (post #46) is...
  2. cygnusv

    How to control the speed of a 24vdc pump from circulating water temperature?

    What do you reckon Chris, would these do it http://www.ebay.co.uk/itm/50-x-100nF-0-1uF-Ceramic-Disc-Capacitor-104-25V-UK-1st-CLASS-POST-/291263960300?hash=item43d0af54ec:g:CRkAAOSwpDdU84z2 Or is there another UK listing that would be better suited? Stu
  3. cygnusv

    How to control the speed of a 24vdc pump from circulating water temperature?

    Edited (with apology) It should read 'Cdrive's' Would it be possible for the part of that same drawing that shows the thermistor connection be clarified for me? Looking more closely it appears to me that the thermistor wires actually become a bridge within the red wire, but it also appears to...
  4. cygnusv

    How to control the speed of a 24vdc pump from circulating water temperature?

    My thermistors (incl a spare) have arrived! Less than £2.50 for 2 including postage from Hong Kong! Amazing, and a 2 week turn around. Anyway. This morning I checked them both to be sure they're working correctly. At room temperature of 21C both are measuring about 10.5K. Dipped into water...
  5. cygnusv

    How to control the speed of a 24vdc pump from circulating water temperature?

    Confirmed measurements made after correcting the plug rotation. No soldering required thank goodness! Stu
  6. cygnusv

    How to control the speed of a 24vdc pump from circulating water temperature?

    Hi Chris - It was one of your replies that caused me to take a second look at the board. I corrected the error before the test. There are 3 stiff wires that come out of the board - the plug fits on these. However, to ensure the plug goes on with the correct polarity there is a handed plastic...
  7. cygnusv

    How to control the speed of a 24vdc pump from circulating water temperature?

    The plug sits in a small plastic recepticle that has grooves to prevent the plug being fitted back to front. This recepticle was fitted back to front. The plug orientation is determined by its recepticle. So yes - the black connected to the 5V and the red to the GND. The connections are very...
  8. cygnusv

    How to control the speed of a 24vdc pump from circulating water temperature?

    Hi Chris Unexpected early reply! I realised that the pwm works in the 6 - 90 volt range, and I have a 6 volt flashlight with the big rectangular battery. I've wired it up through the PWM and it works! Only thing is that the way the factory have assembled the pwm they've got the black wire and...
  9. cygnusv

    How to control the speed of a 24vdc pump from circulating water temperature?

    Hi Chris I'm so pleased that you and the other guys are prepared tp take the time to help. I really do appreciate your efforts.. I take the point about using a low battery voltage for testing, our domestic battery bank is 24 volts and 225AH - definitely more than enough to destroy the kit if I...
  10. cygnusv

    How to control the speed of a 24vdc pump from circulating water temperature?

    Collectively these last few replies have completely cleared up what I need to do. Many thanks. We're completely refurbing the cabin where the control gear and pump will be so I'll report on progress and results in a week or two. Sorry about the knee Chris - but the Chardonnay sounds like an...
  11. cygnusv

    How to control the speed of a 24vdc pump from circulating water temperature?

    Hi Chris http://www.ebay.co.uk/itm/201525661032?_trksid=p2060353.m2749.l2649&var=500712525652&ssPageName=STRK%3AMEBIDX%3AIT The base of the pot is solid with a knob on the other end. Connected to the board remotely with 3 wires Thermistor link above My badly worded question was for shielding...
  12. cygnusv

    How to control the speed of a 24vdc pump from circulating water temperature?

    High CDRIVE Many thanks. I've ordered the thermistor but that won't arrive for a couple of weeks. I understand now the reason for wiring this way. Would you suggest soldering the wires together to make these connections or going through some kind of joint? The cables on the ordered part may not...
  13. cygnusv

    How to control the speed of a 24vdc pump from circulating water temperature?

    What would be the advantage of this over simply replacing the pot with the thermistor? I know I'm showing my ignorance but I am curious and more than willing to learn. Stu
  14. cygnusv

    How to control the speed of a 24vdc pump from circulating water temperature?

    So I'd be looking for a 10KΩ thermistor? Would I need anything else to make it work? Sadly the sensor and the PWM are about 2 metres apart - is this an issue? Stu
  15. cygnusv

    How to control the speed of a 24vdc pump from circulating water temperature?

    Hi Alec_t and Chris The pins are as follows GND (RED) 0-5 (WHITE) 5V (BLACK) I've measured my values using the 20K scale on the meter GND TO BLACK = 9.71 with the knob turned to both min and max 0.5 TO GND = 9.7 with knob fully c/w and 0 when adjusted fully anticlockwise 0-5...
  16. cygnusv

    How to control the speed of a 24vdc pump from circulating water temperature?

    Hi Alec_t How would I measure that? I'm a bit of a newbie to all this but hoping to learn. I've got a decent multimeter... Fascinating things these forums. These messages are doing a round trip of 25,000 miles, yet you're only about 200 miles away! Excellent!!
  17. cygnusv

    How to control the speed of a 24vdc pump from circulating water temperature?

    Hello again all I've now got the pump and the controller with the adjustable pot and have bench wired it. As expected, with the knob turned fully anticlockwise I am registering 0 volts. As I rotate the knob clockwise the voltage rises to about 5.1 volts. I now want to match a suitable...
  18. cygnusv

    How to control the speed of a 24vdc pump from circulating water temperature?

    Hi Chris - you can bank on it! I'm quite looking forward to this. Stu
  19. cygnusv

    How to control the speed of a 24vdc pump from circulating water temperature?

    Typically, I didn't see this listing. I've already ordered the other one. Many thanks though. Stu
  20. cygnusv

    How to control the speed of a 24vdc pump from circulating water temperature?

    Thanks for that Chris it's very helpful. I'm looking forward to everything arriving in a day or two. We'll see what happens... Stu
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