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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Compact Fluorescent Lamp - switch on current ?
15W filament lamp controlled by a tiny reed relay, on for a total of a
couple of hours a day. Been in use for 20 years or so. Decided to replace the working 15 filament one with a 11W CFL but on first switch on, the contacts ,presumably only 0.5A rating or so, held on at switch off. A slight tap releases them but of course no good with continued CFL use unless uprating the relay. Previously stuck contacts occured 10 years or so back when the first 15W bulb blew, plasma arc current at failing switch-on presumably. What is the switch on current of CFLs compared to conventional just out of interest ? -- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on http://home.graffiti.net/diverse:graffiti.net/ |
#2
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Compact Fluorescent Lamp - switch on current ?
On Thu, 24 Jul 2008 16:23:51 +0100, "N_Cook"
wrote: 15W filament lamp controlled by a tiny reed relay, on for a total of a couple of hours a day. Been in use for 20 years or so. Decided to replace the working 15 filament one with a 11W CFL but on first switch on, the contacts ,presumably only 0.5A rating or so, held on at switch off. A slight tap releases them but of course no good with continued CFL use unless uprating the relay. Previously stuck contacts occured 10 years or so back when the first 15W bulb blew, plasma arc current at failing switch-on presumably. What is the switch on current of CFLs compared to conventional just out of interest ? Only proerly designed "power reed" contacts are suitable, a the normal reeds are not any good for currents at amp levels. Having said that, most CFL's have a limiting resistor input, so the input will not be more than a few amps. Peter |
#3
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Compact Fluorescent Lamp - switch on current ?
Peter Dettmann wrote:
On Thu, 24 Jul 2008 16:23:51 +0100, "N_Cook" wrote: 15W filament lamp controlled by a tiny reed relay, on for a total of a couple of hours a day. Been in use for 20 years or so. Decided to replace the working 15 filament one with a 11W CFL but on first switch on, the contacts ,presumably only 0.5A rating or so, held on at switch off. A slight tap releases them but of course no good with continued CFL use unless uprating the relay. Previously stuck contacts occured 10 years or so back when the first 15W bulb blew, plasma arc current at failing switch-on presumably. What is the switch on current of CFLs compared to conventional just out of interest ? Only proerly designed "power reed" contacts are suitable, a the normal reeds are not any good for currents at amp levels. Having said that, most CFL's have a limiting resistor input, so the input will not be more than a few amps. Peter Stick to the 15W filament, your chinese made CFL will only last 8 months before it overheats, blows your relay and dies, costing you 10 times the filament lamp. Surge current on a 22w CFL is 1.5A |
#4
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Compact Fluorescent Lamp - switch on current ?
On Thu, 24 Jul 2008 16:23:51 +0100, "N_Cook" put
finger to keyboard and composed: 15W filament lamp controlled by a tiny reed relay, on for a total of a couple of hours a day. Been in use for 20 years or so. Decided to replace the working 15 filament one with a 11W CFL but on first switch on, the contacts ,presumably only 0.5A rating or so, held on at switch off. A slight tap releases them but of course no good with continued CFL use unless uprating the relay. Previously stuck contacts occured 10 years or so back when the first 15W bulb blew, plasma arc current at failing switch-on presumably. What is the switch on current of CFLs compared to conventional just out of interest ? Here are several reverse engineered CFL circuits: http://www.pavouk.org/hw/lamp/en_index.html The author writes ... "During start is peak collector current about 3 to 5 times bigger than during normal operation." - Franc Zabkar -- Please remove one 'i' from my address when replying by email. |
#6
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Compact Fluorescent Lamp - switch on current ?
=Franc Zabkar wrote in message
... On Thu, 24 Jul 2008 16:23:51 +0100, "N_Cook" put finger to keyboard and composed: 15W filament lamp controlled by a tiny reed relay, on for a total of a couple of hours a day. Been in use for 20 years or so. Decided to replace the working 15 filament one with a 11W CFL but on first switch on, the contacts ,presumably only 0.5A rating or so, held on at switch off. A slight tap releases them but of course no good with continued CFL use unless uprating the relay. Previously stuck contacts occured 10 years or so back when the first 15W bulb blew, plasma arc current at failing switch-on presumably. What is the switch on current of CFLs compared to conventional just out of interest ? Here are several reverse engineered CFL circuits: http://www.pavouk.org/hw/lamp/en_index.html The author writes ... "During start is peak collector current about 3 to 5 times bigger than during normal operation." - Franc Zabkar -- Please remove one 'i' from my address when replying by email. Whatever technical stuff you ever wanted to know about CFLs on there -- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on http://home.graffiti.net/diverse:graffiti.net/ |
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