Kessil A150 is blinking

AlexWBryant · Apr 24, 2019

I bought a Kessil A150 from someone recently for very cheap. It didn't have a power supply and he claimed it was broken. When I gave it a 24v 1.5a power supply it started to blink at about a 1 second frequency, consistently blinking, somewhat like the turn signal that you don't use..

Was wondering if anyone else has dealt with this and/or fixed it. I did contact Kessil and am waiting for a response, but wanted to reach out to the community in the mean time.

Flippers4pups · Apr 24, 2019

AlexWBryant · Apr 24, 2019

Flippers4pups said:
Bump

Thanks brotha

AlexWBryant · Apr 25, 2019

Ok, am updating.

I received an email from Kessil basically saying that I’m SOL unless I want to pay money for inspection and then again for repair. It’s a 5 year old light so I don’t think I will be going that route.

Was able to take the light apart, and can see that when it blinks, it attempts to turn the fan. I figure I’ll give the fan an upgrade and take it from there. Ordered a fan from Jameco. Fan size is 40mm x 40mm x 20mm 24v .09mA.

To take apart the light, just had to twist pretty hard and pull it apart a bit. Couldn’t get it for like 10 minutes, but after a tug on the top, I was able to twist.

Here is a pic so far:

GK3 · Apr 26, 2019

AlexWBryant said:
Ok, am updating.

I received an email from Kessil basically saying that I’m SOL unless I want to pay money for inspection and then again for repair. It’s a 5 year old light so I don’t think I will be going that route.

Was able to take the light apart, and can see that when it blinks, it attempts to turn the fan. I figure I’ll give the fan an upgrade and take it from there. Ordered a fan from Jameco. Fan size is 40mm x 40mm x 20mm 24v .09mA.

To take apart the light, just had to twist pretty hard and pull it apart a bit. Couldn’t get it for like 10 minutes, but after a tug on the top, I was able to twist.

Here is a pic so far:

I just looked but can’t find an image online. Are you sure the kessil light doesn’t expect a constant current power supply instead of voltage? If it expects constant current and you are using the constant voltage type, then my guess is it tries to turn on, overloads your switching powersupply, the powersupply goes into a safe off mode, light turns of, fault is removed, power supply turns on, repeat. This would be very cyclical like you are describing.

It’s just a thought I had so can’t be sure but I’d double check your powersupply requirements.

AlexWBryant · Apr 26, 2019

GK3 said:
I just looked but can’t find an image online. Are you sure the kessil light doesn’t expect a constant current power supply instead of voltage? If it expects constant current and you are using the constant voltage type, then my guess is it tries to turn on, overloads your switching powersupply, the powersupply goes into a safe off mode, light turns of, fault is removed, power supply turns on, repeat. This would be very cyclical like you are describing.

It’s just a thought I had so can’t be sure but I’d double check your powersupply requirements.

Good point! I am using a DC power supply that is rated for the same amperage as the original one that is supplied with the 150. 24VDC, 1.5A. ( this is also stated on the back of the A150 as the input requirements) Assuming that the power supply is not also bad, the problem most likely will be in the circuitry of the components and/or fan. The light flashing on and the off at least gives me an idea that the lights have the ability to turn on, so for now, I'm leaving those out of my hypothesis.

If the fan is not able to turn properly, the rise in resistance would cause a rise in current, which would then most likely cause some sort of internal "overload" sequence to shut itself off as you proposed. Thus the reason why I am targeting the fan as the first fix. It also is the only moving part in the enclosure, and in my head, is the most likely to fail.

GK3 · Apr 26, 2019

AlexWBryant said:
Good point! I am using a DC power supply that is rated for the same amperage as the original one that is supplied with the 150. 24VDC, 1.5A. ( this is also stated on the back of the A150 as the input requirements) Assuming that the power supply is not also bad, the problem most likely will be in the circuitry of the components and/or fan. The light flashing on and the off at least gives me an idea that the lights have the ability to turn on, so for now, I'm leaving those out of my hypothesis.

If the fan is not able to turn properly, the rise in resistance would cause a rise in current, which would then most likely cause some sort of internal "overload" sequence to shut itself off as you proposed. Thus the reason why I am targeting the fan as the first fix. It also is the only moving part in the enclosure, and in my head, is the most likely to fail.

Don’t get me wrong, it could be the fan, but a fan is not a resistive load, its inductive. If the fan were failing, sure I’d expect a spike in current consumption, but not enough to trip your power supply.

Also - you want to check what the kessil power supply is actually capable of. If the back of the kessil light says it consumes 1.5 amps, you don’t want to use a 1.5 amp power supply. This would cause your power supply to be at 100% load 100% of the time. This is bad and that sucker will be warm all the time. I’d suspect that if the kessil light is actually drawing 1.5 amps, their power supply is capable of 3 or 4 amps. But definitely check what the stock power supply says.

Based on the fact it specs 24vdc and 1.5 amp, that doesn’t seem like it expects constant current, so I’d assume your power-supply type is correct.