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Thread: fan controller

  1. #1

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    Default fan controller

    can anyone advise on the best fan controller for a reasonable price.. Fan is RVK L 5 inch

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  3. #2

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    Quote Originally Posted by ferdew View Post
    can anyone advise on the best fan controller for a reasonable price.. Fan is RVK L 5 inch
    I use an ecotechnics fan controller.
    They will cost about £200 but you can sometimes get them off ebay for less.

    Sent from my VOG-L09 using Tapatalk

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    Only ever used a variac, was 79 off the bay, plain jane but does the job

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    Quote Originally Posted by MrCannab1sir View Post
    Only ever used a variac, was 79 off the bay, plain jane but does the job
    ok thanks..do you know what amp/watt variac i need for that fan??thanks

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    Swiftair Temperature Hydroponics Fan Speed Controller £19.99 on eBay.

    I've been using one for a couple of weeks. Seems ok so just ordered another.

    The controller is equipped with an electronic temperature and speed control unit and automatically changes the speed (airflow rate) with respect to the temperature in the ventilation duct or in the premises.

    The front panel of the controller has the following controls and indicators:


    Speed control knob for low speed setting
    Temperature control knob for temperature setting
    Thermostat operating indicator (LED light)
    3m long probe attached


    Set the desired air temperature (thermostat set point) by turning the thermostat control knob to the airflow rate desired by turning the speed control knob.


    If the air temperature increases above the thermostat set point the fan switches to the high speed (maximum airflow rate). If the temperature decreases below the thermostat set point the fan switches to the pre-set lower speed.


    To avoid frequent motor speed switches when the air temperature in the duct is equal to the set temperature point, the speed switch delay is activated. There are two switch delay patterns for various cases.


    The temperature sensor-based feedback delay:


    The motor switches to high speed as the air temperature exceeds 2 ° C above the set thermostat set point.


    The motor revers to the pre-set lower speed as the air temperature drops below the thermostat set point. This pattern is used to keep air temperature to within 2 ° C In this case the motor speed switches are rare.


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    Quote Originally Posted by ferdew View Post
    ok thanks..do you know what amp/watt variac i need for that fan??thanks
    Sorry man numbers fuck me, don't even know tbf. this is the wiring u thread for an rvk 100L, zoom in on the open controller, see wat u make of it

    https://www.thctalk.com/cannabis-for...ac-to-rvk-100L

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  13. #7

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    A lot really seems to depend on how much you need to slow the fan down
    It's Not What You Know, It's What You Can Prove

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    I've just had a look at the specs of a 5" RVK. This model I looked at draws 109 watts. The controller I mentioned handles up to 300 watts. However, for the fan I looked at it states
    The fans can be speed-controlled via a stepless thyristor or a 5-step transformer.
    I think the contoller I said is a stepless thyristor, unfortunately I can't find a spec sheet to confirm it. Then again there are a ton of 5" RVK fans. Look on the fans rating sticker for the model and then go to the manufacturers website and read up on it. You could then ask the eBay seller.

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    Or post a pic of the rating sticker here and I'll see what I can find. I got soooooooo much spare time lol.

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    The cheap multi tapped (btw wrongly called variac) transformers will easily take 4 and 5 inch fans.

    The startup current will be handled by the transformer, even if it goes beyond the continuous current spec.

    Variacs are continuously variable, as opposed to stepped. Aka BL's build.

    Thyristor ones can be ok ( Ecotechnics in mind ) where the thyristor very carefully fires in phase with the AC. Some of the cheap ones akin to a light dimmer switch just chop up the wave and then you get audio frequency harmonics ( at frequencies n x50 Hz in the UK ) commonly referred to as "hums"

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