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Keystone 240TPES epic fail ballast

Keystone 240TPES epic fail ballast

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It has a LCCF of 2.0. Not only is the starting damage questionable, this ballast continues to damage the ballast after the lamp is started.

It starts with a strange bzzzt sound and the two lamps are completely independent. It operates at line frequency, yet the ballast is light weight like an electronic ballast.

It uses an electronic starter with a capacitor and inductor combination ballast. See diagram on left for internal wiring. It uses a funky electronic starter.

I don't know why the label doesn't agree with datasheet.

Actual input power with two F40T12 is about 50W.

keystone_autopsy.jpg epic_fail.jpg GE_PRS.jpg electro_12.jpg

Light Information

Light Information

Manufacturer:Keystone
Model Reference:240TPES

File information

File information

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Filename:epic_fail.jpg
Album name:Luminaire / Fluorescent ballasts
Keywords:Gear
File Size:110 KB
Date added:May 18, 2011
Dimensions:1183 x 688 pixels
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rjluna2
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Robert


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May 18, 2011 at 09:57 AM Author: rjluna2
Interesting

Pretty, please no more Chinese failure.

Medved
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May 18, 2011 at 01:25 PM Author: Medved
I think the main ballast impedance there is the capacitor, the inductor is only rather small, as it's main purpose is to only generate HV ignition spike when the starter open. The second purpose would be to filter out higher harmonics of the current (so to reduce the crest factor), associated to discharges combined with capacitive impedance. So the inductor could be small and the capacitor is lightweight anyway, so bottom line you got cheap, lightweight, low loss, but still mains frequency ballast.

This is similar to F8T5 lightstick's sold here, what were marked as "electronic ballast": They used series capacitor as ballast, follower by rectifier with attached multiplier.
The purpose of the multiplier was to generate high enough OCV for instant start, the rectifier then allow it, while took over the current, after the lamp ignited...

No more selfballasted c***

arcblue
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May 18, 2011 at 10:12 PM Author: arcblue
I think the starters are sidacs, like the component in an HPS ignitor. Interesting little schematic...I never saw the datasheet before.

So essentially it's a capacitor ballast....like those cheap fluorescent nightlights. The regulation is poor...if I start a load (even another higher wattage light) on the same circuit my shoplight with this ballast is on, the lamps go out & restart

I'm lampin...

Luminaire
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May 18, 2011 at 10:39 PM Author: Luminaire
@arcblue that was a problem with LoA one too. The starter gets confused and tries to start a lamp that's already on.

I don't know how to describe this ballast, other than epic fail.
nicksfans
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Down with lamp bans!


GoL the.baus.of.all.bauses UCDl2EWWZc9h1IZXcfGU9OZA nicksfans
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Sep 01, 2013 at 07:55 PM Author: nicksfans
I think this is basically a LOA ballast in a standard ballast case. Nasty stuff. Would rather have instant start.

I like my lamps thick, my ballasts heavy, and my fixtures tough.

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Ash
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Sep 02, 2013 at 07:29 AM Author: Ash
Yep
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