Recent content by nzfarmer

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  1. N

    DOH!, I've lost the default password. Any clues (HC-Y810 Digital Pressure switch)

    Thanks all. Yes 132 Seems to be the magic number!
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    DOH!, I've lost the default password. Any clues (HC-Y810 Digital Pressure switch)

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    I love linux - cpulimit

    Well after 30 years of working with Linux, and around 10 using it in anger for control system automation, it was a pleasant surprise to stumble across another wee utility to add to our toolset. cpulimit does exactly what it promises. You pass it a limit value in % of available CPU and a program...
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    CO2 Sensors recommendation

    Hi all Am looking for recommendations for CO2 sensors for an automated grow room. I have tried prototyping a data logger using two devices already with very disappointing results. The MH-Z19 and an SM300D2. When a pair of either of these are left running, the CO2 readings are typically...
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    Door Opener on Reefer Container

    :) I could not agree with you more. That said, without a schematic, and with serious doubts about what exactly I have, (other than the fact it serves as a potentiometer) am thinking my best way forward is to remove it and mount a stepper motor in its place that will perform the required...
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    Door Opener on Reefer Container

    Yes, worm gear was the wrong terminology. Apologies. The small cog engages with the teeth on vent opener - a metal door approx. 100x250mm that exposes or closes the shown vent. Am not sure what the larger bolt is for but will check again. The assumption is that the Carrier unit has some...
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    Door Opener on Reefer Container

    Found a way :)
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    Door Opener on Reefer Container

    Thanks CSP, Very helpful. I had a closer look, and there is no other device that controls the very simple light closing door. So the device in question must integrate both a motor and the pot somehow. (If you look from the side, it is round and resembles a motor) Thanks for your...
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    Door Opener on Reefer Container

    hi Mike! It is indeed a motor as well. I took a video but not sure how to share via google docs. That said, you can see in the image the shaft of the spindle that drives the small cog that drives the worm gear. The 3 wires go into a small inline device that reduces the cable to two wires...
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    Door Opener on Reefer Container

    Anyone like to have a crack at guessing how to drive this reversible motor? It drives the worm gear on the vent of a Carrier AC system. See: https://docs.google.com/document/d/1Ly4oP0t8ZDYiohIipR3WiXf97Jg8iw55MHqf7N6Na70/edit
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    Wiring for 1 Phase 460 Volt Evaporator Motor (Carrier Transicold)

    Thanks d. Well it turned out to be a little more of a mission. Apparently the motors are two speed, and higher speed coils were burnt out. One motor had two capacitors and could be started in low speed, but the other didn't. I had a small fright tonight as I'd tested yesterday with 240v...
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    Wiring for 1 Phase 460 Volt Evaporator Motor (Carrier Transicold)

    This may be of help: https://files.carrier.com/container-refrigeration/en/worldwide/contentimages/TL_06_07-12.pdf
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    Wiring for 1 Phase 460 Volt Evaporator Motor (Carrier Transicold)

    Am repurposing a refrigerated shipping container that has a couple of these fans in it: https://www.alibaba.com/product-detail/Carrier-Transicold-54-00585-20-2_60788106493.html Each unit has 7 wires: Blue Orange Yellow White Brown Brown Green The closest I've come across is...
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