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Old 08-28-2009, 04:39 PM   #1
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Default Problem with HPS light

I've got an issue with some HPS lights (Lithonia Hi-Tek TWH 400S TB) where they shut off after about 5 min of use. They come back on a few minutes later, but they keep cycling on and off. They usually take about a minute after shutting off to turn back on.

I've changed the ballast, igniter, and capacitor with no effect. I've also talked to Lithonia support, but they don't have any further options to try.

Any ideas on what else it could be?

Thanks

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Old 08-28-2009, 04:44 PM   #2
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Maybe the lamp?

What is an 'advanced electrician'?

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Old 08-28-2009, 04:53 PM   #3
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Quote:
I've changed the ballast, igniter, and capacitor with no effect.




Lighting 101.

HPS lamps cycle when they are bad.
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Old 08-28-2009, 04:54 PM   #4
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Maybe the lamp?

What is an 'advanced electrician'?
I've also tried changing the bulb.
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Old 08-28-2009, 04:55 PM   #5
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Step 2: Verify the proper combination of ballast, capacitor and lamp.
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Old 08-28-2009, 05:02 PM   #6
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Is it multi-tap?
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Old 08-28-2009, 05:07 PM   #7
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Is there a photocell involved in this setup??

If there is, bypass it and see what happens
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Old 08-28-2009, 05:09 PM   #8
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Is there a photocell involved in this setup??

If there is, bypass it and see what happens
There is a photocell and the lights that are giving problems still turn on and off when it is bypassed.

I don't believe that this is a multi-tap setup.
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Old 08-28-2009, 05:11 PM   #9
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how many lights total?

Are they going off at the same time or different times??
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Old 08-28-2009, 05:14 PM   #10
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sounds like wrong bulbs and they are resetting on thermal overload
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Old 08-28-2009, 05:14 PM   #11
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Quote:
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.............I don't believe that this is a multi-tap setup.
You replaced the ballasts and don't know if they were multi-tap?
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Old 08-28-2009, 05:16 PM   #12
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how many lights total?

Are they going off at the same time or different times??
There are 38 lights total. 18 of them are having this issue.

When the photocell is bypassed they all come on and the ones that are shutting off are doing so at different times. There doesn't seem to be a pattern that they follow as far as a group of them turning off at the same time.
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Old 08-28-2009, 05:17 PM   #13
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I've also tried changing the bulb
Try again. Make sure you use the proper lamp and make sure it's a good lamp. A bad new lamp is not impossible. A bad lamp that somebody gave you and said was new is not out of the queation either.


HPS lamp cycle when they are bad. That's what they do.
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Old 08-28-2009, 05:20 PM   #14
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How are you controlling the lights?

How many circuits.. lighting contactor??
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Old 08-28-2009, 05:21 PM   #15
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OK. Let's go back to the very beginning and establish a baseline here.

What caused you to do this work on the fixtures? Were they not working at all? Or were they cycling then as they are now?

What did you do first? Replace the lamp? Replace the ballast kits? Replace both?

AND: Are the ballast kits multi-tap or not?
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Old 08-28-2009, 05:50 PM   #16
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OK. Let's go back to the very beginning and establish a baseline here.
Information is important.

My guess is that they just let the lights go several years unmaintained and wound up with 18 cycling lamps scattered around. Then he relaced one of them with an old lamp found in the maintenance room that "looked good" then moved on to the ballast etc.

I'm just guessing because I don't have the full story.

1. Verify the type of lamp needed. The name plate on the fixture may be incorrect. I learned that the hard way.

2. Start replacing (more than one of) them.
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Old 08-28-2009, 05:51 PM   #17
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I am guessing this problem is at the end of a long wire run. The symptoms point to excessive voltage drop due to the long run and/or bad connections. As one light turns on it changes the load and may drop another light because they are fighting for power.
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Old 08-28-2009, 05:53 PM   #18
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My money is riding on he's got multi-tap ballasts and didn't hook up the right leads.
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Old 08-28-2009, 05:59 PM   #19
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My money is riding on he's got multi-tap ballasts and didn't hook up the right leads.
He didn't even say what voltage he is using

(38) 400 watt fixtures is roughly 85 amps @ 208V during start up

I am guessing the start up wattage is around 450 per fixture
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Old 08-28-2009, 06:14 PM   #20
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How is it possible to replace the ballast and not know if it's multi-tap?

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