anyone tried to using Jebo WP40?

[dazza1304]

Light sensor issue resolution

Light sensor issue resolution

Hi guys,

Anyone experiencing the light sensor tripping into night mode and then not, here is your answer from a UK forum - the saltybox.

HTH's


Why does the problem occur? Well, it really depends how dark your dark is, and it maybe that the problem doesn't occur.

The controller without the night sensor obviously needs to operate just in full power mode - the controller interprets a high input resistance in the light sensor socket as no sensor plugged in, and of course stays in full power mode.

The light sensor resistance increases the darker it gets. When tank lights are on, resistance of the sensor is pretty low around 1k or lower. When it gets darker, the resistance increases and when it reaches around 70k, it triggers the controller to go in night mode. As it gets darker, the resistance continues to increase until a point when the resistance reaches in excess of 800k, the controller "thinks" the sensor is disconnected and goes back into full power mode.

Simply putting a high value resistor in parallel with the sensor limits the maximum resistance the controller can see - for example, with the 550k resistor I used, the maximum resistance the controller can see will never be higher than 550k, this ensuring the controller stays in night mode when its dark and goes into full power mode when it is day.

 

[SimonSKL]

Hi guys,

Anyone experiencing the light sensor tripping into night mode and then not, here is your answer from a UK forum - the saltybox.

HTH's


Why does the problem occur? Well, it really depends how dark your dark is, and it maybe that the problem doesn't occur.

The controller without the night sensor obviously needs to operate just in full power mode - the controller interprets a high input resistance in the light sensor socket as no sensor plugged in, and of course stays in full power mode.

The light sensor resistance increases the darker it gets. When tank lights are on, resistance of the sensor is pretty low around 1k or lower. When it gets darker, the resistance increases and when it reaches around 70k, it triggers the controller to go in night mode. As it gets darker, the resistance continues to increase until a point when the resistance reaches in excess of 800k, the controller "thinks" the sensor is disconnected and goes back into full power mode.

Simply putting a high value resistor in parallel with the sensor limits the maximum resistance the controller can see - for example, with the 550k resistor I used, the maximum resistance the controller can see will never be higher than 550k, this ensuring the controller stays in night mode when its dark and goes into full power mode when it is day.

It makes perfect sense to me. This is what I thought all along as the reason for why the night sensor will go into full power mode in totally dark room. Are there photoresistor that doesn't go higher than 550K as max resistance?

 

[matiLanza]

That explains the same problem I have, makes sense. When tank light go off the controller goes into night mode but when the room is completely dark the controller turns back on

 

[dazza1304]

It makes perfect sense to me. This is what I thought all along as the reason for why the night sensor will go into full power mode in totally dark room. Are there photoresistor that doesn't go higher than 550K as max resistance?

Wouldn't have a clue about that, but I know it fixes the problem as I have done it!

Apparently problem is rectified in the new controller.

 

[wcharon]

Do you guys think that 2 WP-40's will be overkill for my 125 SPS tank or should i go with 2 WP-25???

Thanks in advance...

 

[Ron Reefman]

For anybody still having problem with their night sensors, I have the solution. The ones they sent with the controllers didn't work in total darkness, but the replacement ones that I purchased did. Very expensive shipping so I searched for an alternative light sensor on ebay. Just got them today and they work fine in complete darkness. 30pcs for $3.27 from China. I'm not sure about linking to them, so search for this...
30PCS Photoresistor GL5537 LDR Photo Resistors.

I just want to publicly thank michaellee64 for sending me some of these resistors and also testify that they do exactly what they are supposed to do. For the first time in 4+ months, my Night Mode works without my having to set the controller on top of the tank so it gets light from the led moonlights! Thank you for finding these and for helping me out.

Two thumbs up and I owe you a beer! :thumbsup::thumbsup::beer:

 

[michaellee64]

I'm glad they worked out for you. Have a wonderful 4th of July!

 

[rtbm]

Well I jumped in and got two of these today. I am sorry that I have not read this long thread all the way and maybe this is common with these, but I am certain that one of the wp40s is weaker than the other.

anyone else have this?

 

[Dactylopterus]

Well I jumped in and got two of these today. I am sorry that I have not read this long thread all the way and maybe this is common with these, but I am certain that one of the wp40s is weaker than the other.

anyone else have this?

Could be a malfunctioning power supply?, do you have a multimeter to test the voltage?

 

[Dactylopterus]

Now Fishstreet is selling replacement parts for the WP25 WP40, they have Impeller replacements, powersupply, magnet mounts and controllers at very good prices.

 

[Sacohen]

Now Fishstreet is selling replacement parts for the WP25 WP40, they have Impeller replacements, powersupply, magnet mounts and controllers at very good prices.

They have been selling those parts since before the 25 came out.

 

[007Bond]

Why replacement on magnet mounts.

 

[Sacohen]

Some people may have bought the version of the 25 that had the suction cup mount instead of the magnetic.

 

[Dactylopterus]

Also maybe for someone who broke the clamp that holds the pump. I not sure if it comes complete with the plastic clamp.

 

[troublet55]

Well I jumped in and got two of these today. I am sorry that I have not read this long thread all the way and maybe this is common with these, but I am certain that one of the wp40s is weaker than the other.

anyone else have this?

Well I don't have two to compare, but when I first put the WP 40 in my 90 gallon tank it would slosh water out if turned more than a quarter of the way up. Now 2 months later, I have it all the way up and it is very obvious that it does not have even half the power that it did. I put a WP 25 in yesterday and it moves way more water than the old 40?

I tried a different power supply (laptop), swapped the controllers between the 40 and 25, did a vinegar scrub on the wet part and it is still running weak? So I will be searching for a replacement power head or getting another 25 as I think the 25's are more than adequate for my needs.

 

[Dactylopterus]

You should try to ask for a replacement, your pump is still under warranty, what you describe isn't normal

 

[Lateralus]

Is this pretty much what people are using to dial down the wp40? http://www.fish-street.com/12v_to_24v_power_supply_for_jebao_wp-40_wp-25_replacement_pump

 

[Sacohen]

Is this pretty much what people are using to dial down the wp40? http://www.fish-street.com/12v_to_24v_power_supply_for_jebao_wp-40_wp-25_replacement_pump

No I think most people have been using this one off of EBay.

 

[Lateralus]

Anyone have a link to that piece?

 

[Sacohen]

Did you even try searching for it?
Not allowed to post link to items for sale.

Search for the following on Ebay...

DC 5V-24V 4A 48W LED Light Dimmer