ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals

ECN Shout Chat
Top Posters(30 Days)
Admin 19
Recent Posts
Anyone hiring inspectors?
by HotLine1. 03/27/17 08:03 AM
Old decora style outlets
by Admin. 03/25/17 11:40 AM
ESA Arc flash course
by TheShockDoctors. 03/24/17 10:15 AM
fuse rejectors
by HotLine1. 03/24/17 07:53 AM
Another Forum Update
by Admin. 03/22/17 03:04 PM
New in the Gallery:
SE cable question
Popular Topics(Views)
231,597 Are you busy
166,422 Re: Forum
160,696 Need opinion
Who's Online Now
1 registered members (gfretwell), 54 guests, and 9 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
#129428 - 03/14/05 08:23 PM Fixture Burnout  
bwise121  Offline
Member
Joined: Sep 2003
Posts: 114
Sacramento, CA USA
I was asked to install a new High Pressure Sodium fixture near an existing one. From the existing fixture I conduited 50 feet and set the new fixture. Both of these fixtures are controlled by a photo cell on the roof. The existing fixture was existing and old. It must have had a bad starter because it would go on and off at regular intervals. When I first installed the new fixture and tested it, the old and new fixture would "take turns" being on. I wasn't sure what was going on with that. I do know neither had their own photo cell.
Now two months later, the old fixture only blinks and the new one doesn't work. I tested the voltage at the new fixture (feed 120V) and at the socket (54V), so I think the transformer is shot.

Here is my question. I can see why the old fixture is not working (old), but could a problem with that fixture ruin the new fixture?

Let me know if I left out any important details.

Many thanks,
Byron


Tools for Electricians:

#129429 - 03/16/05 12:15 AM Re: Fixture Burnout  
Scott35  Offline

Broom Pusher and
Member
Joined: Oct 2000
Posts: 2,707
Anaheim, CA. USA
Hello Bwise;

From the descriptions you have given, it sounds like Lamp failure on both fixtures.
HPS Lamps will cycle on/off when they near the end of their "Life" - more frequently as age increases (age = operation hours).

These must be 150 Watt (or less) HPS Lamps with Medium bases - which would be appropriate from the 54 Volts measured at the Lamp Holder (Med. base socket). These Lamps are 55 Volt Lamps.
If the Lamps are Mogul Base, then the open circuit Voltage is kind of low, and a Ballast replacement may be required.

Be sure the Ignitor on the newer fixture is operational, by installing a known-working HPS Lamp of the same Wattage in the fixture and powering it up. If Lamp does not start, suspect Ignitor failure.
If you have an equivalent, known-working Ignitor, swap it out with the existing Ignitor in the fixture being tested, then power it up to verify Lamp starts.

One last thing - or two [Linked Image] :
<OL TYPE=A>

[*] Verify correct wiring between Lamp, Ballast and Ignitor,

[*] If a PF Capacitor is used, verify it is connected on the "Input" side of the Reactor coil... where the 120 VAC circuit connects,

[*] Verify the Reactor's leads are connected to the correct "sides" - e.g. Input side to branch circuit "hot" wire.
</OL>

If you need wiring Schematic assistance, check the Technical Reference section of ECN for H.I.D. Ballast Schematics.

Let us know of the outcome - and most of all... Good Luck!

Scott 35

edited to fix a blunderful statement! [Linked Image]

[This message has been edited by Scott35 (edited 03-15-2005).]


Scott " 35 " Thompson
Just Say NO To Green Eggs And Ham!


Member Spotlight
lil suzi
lil suzi
Midwest
Posts: 57
Joined: August 2003
Show All Member Profiles 
Featured:

2017 NEC and Related
2017 NEC
Now Available!

Shout Box
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.015s Queries: 14 (0.004s) Memory: 0.7440 MB (Peak: 0.8601 MB) Zlib enabled. Server Time: 2017-03-28 00:34:21 UTC