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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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I have a cyclic defrost fridge in near-new condition which was given
to me, the only problem was the defrost element open circuit. Well, that fridge has been sitting there for a year, and now that I decide to fix it, I find the compressor won't start. She hums, likea the buzzy bee, then the overtemp protector clicks out. Question - I know that the fridge mechs have a device that they connect up to send a bit of a boost thru the compressor to unstick it, but I'm a bit tight, and if I can rig up a relay and/or a capacitor and/or a triac and/or an instantaneous switch or whatever to do it myself, I will. What's the general principle of it? Am I correct in assuming that the idea is to connect a capacitor across the inductance of the start winding to make a LC circuit whose resonant freq is close to mains freq, so that you can get a lot of current flowing for a small fraction of a second? So... how do I make one of these gizmos? Can't be too hard, surely? T. |
#2
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![]() "Thurston Phoremost" wrote in message om... I have a cyclic defrost fridge in near-new condition which was given to me, the only problem was the defrost element open circuit. Well, that fridge has been sitting there for a year, and now that I decide to fix it, I find the compressor won't start. She hums, likea the buzzy bee, then the overtemp protector clicks out. Question - I know that the fridge mechs have a device that they connect up to send a bit of a boost thru the compressor to unstick it, but I'm a bit tight, and if I can rig up a relay and/or a capacitor and/or a triac and/or an instantaneous switch or whatever to do it myself, I will. What's the general principle of it? Am I correct in assuming that the idea is to connect a capacitor across the inductance of the start winding to make a LC circuit whose resonant freq is close to mains freq, so that you can get a lot of current flowing for a small fraction of a second? So... how do I make one of these gizmos? Can't be too hard, surely? T. Put the cap in series with the winding, note that start caps don't need the full mains rating since they are in circuit for such a small time. See if you can find one about 250 uF and about half your local mains voltage. You can turn off the power if it doesn't get away in a second or so. Might take a few "Hits". -- Regards ............... Rheilly Phoull |
#3
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![]() "Thurston Phoremost" wrote in message om... I have a cyclic defrost fridge in near-new condition which was given to me, the only problem was the defrost element open circuit. Well, that fridge has been sitting there for a year, and now that I decide to fix it, I find the compressor won't start. She hums, likea the buzzy bee, then the overtemp protector clicks out. Question - I know that the fridge mechs have a device that they connect up to send a bit of a boost thru the compressor to unstick it, but I'm a bit tight, and if I can rig up a relay and/or a capacitor and/or a triac and/or an instantaneous switch or whatever to do it myself, I will. What's the general principle of it? Am I correct in assuming that the idea is to connect a capacitor across the inductance of the start winding to make a LC circuit whose resonant freq is close to mains freq, so that you can get a lot of current flowing for a small fraction of a second? So... how do I make one of these gizmos? Can't be too hard, surely? T. Put the cap in series with the winding, note that start caps don't need the full mains rating since they are in circuit for such a small time. See if you can find one about 250 uF and about half your local mains voltage. You can turn off the power if it doesn't get away in a second or so. Might take a few "Hits". -- Regards ............... Rheilly Phoull |
#4
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"Rheilly Phoull" writes:
"Thurston Phoremost" wrote in message om... I have a cyclic defrost fridge in near-new condition which was given to me, the only problem was the defrost element open circuit. Well, that fridge has been sitting there for a year, and now that I decide to fix it, I find the compressor won't start. She hums, likea the buzzy bee, then the overtemp protector clicks out. Question - I know that the fridge mechs have a device that they connect up to send a bit of a boost thru the compressor to unstick it, but I'm a bit tight, and if I can rig up a relay and/or a capacitor and/or a triac and/or an instantaneous switch or whatever to do it myself, I will. What's the general principle of it? Am I correct in assuming that the idea is to connect a capacitor across the inductance of the start winding to make a LC circuit whose resonant freq is close to mains freq, so that you can get a lot of current flowing for a small fraction of a second? So... how do I make one of these gizmos? Can't be too hard, surely? And if you do it incorrectly, you've fried the compressor motor and turned your fridge into a plant stand. You really don't even know if the motor is stuck. Maybe the starting relay is stuck. Have a professional look at it. Really! --- sam | Sci.Electronics.Repair FAQ Home Page: http://www.repairfaq.org/ Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/ +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm | Mirror Site Info: http://www.repairfaq.org/REPAIR/F_mirror.html Important: The email address in this message header may no longer work. To contact me, please use the Feedback Form at repairfaq.org. Thanks. T. Put the cap in series with the winding, note that start caps don't need the full mains rating since they are in circuit for such a small time. See if you can find one about 250 uF and about half your local mains voltage. You can turn off the power if it doesn't get away in a second or so. Might take a few "Hits". -- Regards ............... Rheilly Phoull |
#5
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"Rheilly Phoull" writes:
"Thurston Phoremost" wrote in message om... I have a cyclic defrost fridge in near-new condition which was given to me, the only problem was the defrost element open circuit. Well, that fridge has been sitting there for a year, and now that I decide to fix it, I find the compressor won't start. She hums, likea the buzzy bee, then the overtemp protector clicks out. Question - I know that the fridge mechs have a device that they connect up to send a bit of a boost thru the compressor to unstick it, but I'm a bit tight, and if I can rig up a relay and/or a capacitor and/or a triac and/or an instantaneous switch or whatever to do it myself, I will. What's the general principle of it? Am I correct in assuming that the idea is to connect a capacitor across the inductance of the start winding to make a LC circuit whose resonant freq is close to mains freq, so that you can get a lot of current flowing for a small fraction of a second? So... how do I make one of these gizmos? Can't be too hard, surely? And if you do it incorrectly, you've fried the compressor motor and turned your fridge into a plant stand. You really don't even know if the motor is stuck. Maybe the starting relay is stuck. Have a professional look at it. Really! --- sam | Sci.Electronics.Repair FAQ Home Page: http://www.repairfaq.org/ Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/ +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm | Mirror Site Info: http://www.repairfaq.org/REPAIR/F_mirror.html Important: The email address in this message header may no longer work. To contact me, please use the Feedback Form at repairfaq.org. Thanks. T. Put the cap in series with the winding, note that start caps don't need the full mains rating since they are in circuit for such a small time. See if you can find one about 250 uF and about half your local mains voltage. You can turn off the power if it doesn't get away in a second or so. Might take a few "Hits". -- Regards ............... Rheilly Phoull |
#6
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![]() Sam Goldwasser wrote: "Rheilly Phoull" writes: "Thurston Phoremost" wrote in message om... I have a cyclic defrost fridge in near-new condition which was given to me, the only problem was the defrost element open circuit. Well, that fridge has been sitting there for a year, and now that I decide to fix it, I find the compressor won't start. She hums, likea the buzzy bee, then the overtemp protector clicks out. Question - I know that the fridge mechs have a device that they connect up to send a bit of a boost thru the compressor to unstick it, but I'm a bit tight, and if I can rig up a relay and/or a capacitor and/or a triac and/or an instantaneous switch or whatever to do it myself, I will. What's the general principle of it? Am I correct in assuming that the idea is to connect a capacitor across the inductance of the start winding to make a LC circuit whose resonant freq is close to mains freq, so that you can get a lot of current flowing for a small fraction of a second? So... how do I make one of these gizmos? Can't be too hard, surely? And if you do it incorrectly, you've fried the compressor motor and turned your fridge into a plant stand. You really don't even know if the motor is stuck. Maybe the starting relay is stuck. Have a professional look at it. Really! --- sam | Sci.Electronics.Repair FAQ Home Page: http://www.repairfaq.org/ Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/ +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm | Mirror Site Info: http://www.repairfaq.org/REPAIR/F_mirror.html Important: The email address in this message header may no longer work. To contact me, please use the Feedback Form at repairfaq.org. Thanks. T. Put the cap in series with the winding, note that start caps don't need the full mains rating since they are in circuit for such a small time. See if you can find one about 250 uF and about half your local mains voltage. You can turn off the power if it doesn't get away in a second or so. Might take a few "Hits". -- Regards ............... Rheilly Phoull Do a web search on "hard start kit" and supco. chances are that if you replaced the cap in the start circuit, the compressor is bad. Another thought, did you move the refrigerator recently? You should not start it up for at least 24 hours if it was moved and tipped. BOB -----= Posted via Newsfeeds.Com, Uncensored Usenet News =----- http://www.newsfeeds.com - The #1 Newsgroup Service in the World! -----== Over 100,000 Newsgroups - 19 Different Servers! =----- |
#7
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![]() Sam Goldwasser wrote: "Rheilly Phoull" writes: "Thurston Phoremost" wrote in message om... I have a cyclic defrost fridge in near-new condition which was given to me, the only problem was the defrost element open circuit. Well, that fridge has been sitting there for a year, and now that I decide to fix it, I find the compressor won't start. She hums, likea the buzzy bee, then the overtemp protector clicks out. Question - I know that the fridge mechs have a device that they connect up to send a bit of a boost thru the compressor to unstick it, but I'm a bit tight, and if I can rig up a relay and/or a capacitor and/or a triac and/or an instantaneous switch or whatever to do it myself, I will. What's the general principle of it? Am I correct in assuming that the idea is to connect a capacitor across the inductance of the start winding to make a LC circuit whose resonant freq is close to mains freq, so that you can get a lot of current flowing for a small fraction of a second? So... how do I make one of these gizmos? Can't be too hard, surely? And if you do it incorrectly, you've fried the compressor motor and turned your fridge into a plant stand. You really don't even know if the motor is stuck. Maybe the starting relay is stuck. Have a professional look at it. Really! --- sam | Sci.Electronics.Repair FAQ Home Page: http://www.repairfaq.org/ Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/ +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm | Mirror Site Info: http://www.repairfaq.org/REPAIR/F_mirror.html Important: The email address in this message header may no longer work. To contact me, please use the Feedback Form at repairfaq.org. Thanks. T. Put the cap in series with the winding, note that start caps don't need the full mains rating since they are in circuit for such a small time. See if you can find one about 250 uF and about half your local mains voltage. You can turn off the power if it doesn't get away in a second or so. Might take a few "Hits". -- Regards ............... Rheilly Phoull Do a web search on "hard start kit" and supco. chances are that if you replaced the cap in the start circuit, the compressor is bad. Another thought, did you move the refrigerator recently? You should not start it up for at least 24 hours if it was moved and tipped. BOB -----= Posted via Newsfeeds.Com, Uncensored Usenet News =----- http://www.newsfeeds.com - The #1 Newsgroup Service in the World! -----== Over 100,000 Newsgroups - 19 Different Servers! =----- |
#8
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Is the fridge out in a freezing cold garage? If so, let the compressor
warm up to room temp and then give it a try. It may be the oil mixed in with the refrigerant has become waxlike. Thurston Phoremost wrote: I have a cyclic defrost fridge in near-new condition which was given to me, the only problem was the defrost element open circuit. Well, that fridge has been sitting there for a year, and now that I decide to fix it, I find the compressor won't start. She hums, likea the buzzy bee, then the overtemp protector clicks out. Question - I know that the fridge mechs have a device that they connect up to send a bit of a boost thru the compressor to unstick it, but I'm a bit tight, and if I can rig up a relay and/or a capacitor and/or a triac and/or an instantaneous switch or whatever to do it myself, I will. What's the general principle of it? Am I correct in assuming that the idea is to connect a capacitor across the inductance of the start winding to make a LC circuit whose resonant freq is close to mains freq, so that you can get a lot of current flowing for a small fraction of a second? So... how do I make one of these gizmos? Can't be too hard, surely? T. |
#9
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Is the fridge out in a freezing cold garage? If so, let the compressor
warm up to room temp and then give it a try. It may be the oil mixed in with the refrigerant has become waxlike. Thurston Phoremost wrote: I have a cyclic defrost fridge in near-new condition which was given to me, the only problem was the defrost element open circuit. Well, that fridge has been sitting there for a year, and now that I decide to fix it, I find the compressor won't start. She hums, likea the buzzy bee, then the overtemp protector clicks out. Question - I know that the fridge mechs have a device that they connect up to send a bit of a boost thru the compressor to unstick it, but I'm a bit tight, and if I can rig up a relay and/or a capacitor and/or a triac and/or an instantaneous switch or whatever to do it myself, I will. What's the general principle of it? Am I correct in assuming that the idea is to connect a capacitor across the inductance of the start winding to make a LC circuit whose resonant freq is close to mains freq, so that you can get a lot of current flowing for a small fraction of a second? So... how do I make one of these gizmos? Can't be too hard, surely? T. |
#10
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Sam Goldwasser wrote in message ...
"Rheilly Phoull" writes: "Thurston Phoremost" wrote in message om... I have a cyclic defrost fridge in near-new condition which was given to me, the only problem was the defrost element open circuit. Well, that fridge has been sitting there for a year, and now that I decide to fix it, I find the compressor won't start. She hums, likea the buzzy bee, then the overtemp protector clicks out. Question - I know that the fridge mechs have a device that they connect up to send a bit of a boost thru the compressor to unstick it, but I'm a bit tight, and if I can rig up a relay and/or a capacitor and/or a triac and/or an instantaneous switch or whatever to do it myself, I will. What's the general principle of it? Am I correct in assuming that the idea is to connect a capacitor across the inductance of the start winding to make a LC circuit whose resonant freq is close to mains freq, so that you can get a lot of current flowing for a small fraction of a second? So... how do I make one of these gizmos? Can't be too hard, surely? And if you do it incorrectly, you've fried the compressor motor and turned your fridge into a plant stand. Yup. That's why I'm asking here, to get enough info so as I don't do it incorrectly. I won't do anything till I have as much info as I can get. You really don't even know if the motor is stuck. Maybe the starting relay is stuck. Have a professional look at it. Really! The relay looks like it can't be taken apart. I'd be interested to know if anyone has ever tried to test these things with a dummy load, for instance in the same way that you can use light bulbs as a dummy load to test a SMPS? Does an easily audible hum from the compressor generally/probably/usually indicate that the start winding is getting current? IOW, if only the run winding is getting power, would I still get an easily audible hum? If only the run winding in a stuck compressor was drawing current, would this current generally/probably/usually be sufficient to trip the safety switch, or is it only the start winding that has sufficiently low impedance to cause it to trip? This is the sort of info that I am after. TIA. T |
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