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Using Electronic Timer for Metal-Halide lamps

hi,
Recantly i purchased one Electronic timer with 25 A load capacity (25A
relay contact to switch the AC line) for my hoarding lighting. I am
using 5 150W Metal-Halide lamps for hoardings, so total load of 750W. I
set the on-time 6.00 PM and off-time as 10.00 PM. When the timer
switching on the Lamps (Metal halide) the timer is getting reset to
zero. Again i set the time and tested. But the same problem happaned.
So i removed the timer and tested by connecting 10 100W bulbs. But the
timer was not showing problem with Bulbs. It worked perfectly. Is this
a problem with timer or Metal halide lamps? Please help me finding a
solution for this..
 
H

Homer J Simpson

Jan 1, 1970
0
Recantly i purchased one Electronic timer with 25 A load capacity (25A
relay contact to switch the AC line)

What's the motor rating? The lamp rating?
 
G

Graham Holloway

Jan 1, 1970
0
hi,
Recantly i purchased one Electronic timer with 25 A load capacity (25A
relay contact to switch the AC line) for my hoarding lighting. I am
using 5 150W Metal-Halide lamps for hoardings, so total load of 750W. I
set the on-time 6.00 PM and off-time as 10.00 PM. When the timer
switching on the Lamps (Metal halide) the timer is getting reset to
zero. Again i set the time and tested. But the same problem happaned.
So i removed the timer and tested by connecting 10 100W bulbs. But the
timer was not showing problem with Bulbs. It worked perfectly. Is this
a problem with timer or Metal halide lamps? Please help me finding a
solution for this..

It might be the lamp ignition that is causing the problem. A bit of either
conducted or radiated EMI. Try fitting some form of suppression at the
timer.

Graham H
 
D

Don Foreman

Jan 1, 1970
0
hi,
Recantly i purchased one Electronic timer with 25 A load capacity (25A
relay contact to switch the AC line) for my hoarding lighting. I am
using 5 150W Metal-Halide lamps for hoardings, so total load of 750W. I
set the on-time 6.00 PM and off-time as 10.00 PM. When the timer
switching on the Lamps (Metal halide) the timer is getting reset to
zero. Again i set the time and tested. But the same problem happaned.
So i removed the timer and tested by connecting 10 100W bulbs. But the
timer was not showing problem with Bulbs. It worked perfectly. Is this
a problem with timer or Metal halide lamps? Please help me finding a
solution for this..

Metal halide lamps can generate a lot of RFI/EMI. They may have an
electronic ballast, and they all use some sort of hi voltage
ignition. Your electronic timer may be susceptable.

Possible remedies:

*line filter (that can handle the power) between lights and timer
*line filter just on timer power, use the timer to drive an external
relay
*use a cheap electromechanical timer 5 bux at WalMart.
 
S

Studio271

Jan 1, 1970
0
I was having a similar issue with using some metal-halides with an
outdoor motion-sensor recently. I just went back to incandescents and
ignored it, figuring it was just trying to draw too much power from the
motion-sensor's switch/relay. :-/

-Drew
 
F

Father Haskell

Jan 1, 1970
0
hi,
Recantly i purchased one Electronic timer with 25 A load capacity (25A
relay contact to switch the AC line) for my hoarding lighting. I am
using 5 150W Metal-Halide lamps for hoardings, so total load of 750W. I
set the on-time 6.00 PM and off-time as 10.00 PM. When the timer
switching on the Lamps (Metal halide) the timer is getting reset to
zero. Again i set the time and tested. But the same problem happaned.
So i removed the timer and tested by connecting 10 100W bulbs. But the
timer was not showing problem with Bulbs. It worked perfectly. Is this
a problem with timer or Metal halide lamps? Please help me finding a
solution for this..

Surge? If so, you'll need something with adequate duty contacts or
some way such as a sequencer to turn each lamp on one after
another instead of all at once. At least, put each HID unit on its
own relay.
 
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