Plz help i have exactly like the one on the right and i have problem with R63 ,R65 and R64 it blown up and i can't detect thier numer to be replaced can you tell me of the resistant number
WOW!!! Craig, that was amazing troubleshooting techniques. Really interesting, informative and helpful, such insight!!!! Tell me if you have time to repsond. What is the purpose of the relay on this board? I am thinking it is a inrush current limiter with such a large capacitor? I've seen this on other boards where the relay is in parallel with a large resistor. Thank you so very much for all your time and effort on these wonderful videos, especially concerning exercise equipment boards.
Hi Andre, I'm guessing here as I have never looked at the relay part of the circuit. I don't recall any inrush current limiting devices - normally an NTC resistor. There were also no large power resistors. The relay switches in immediately - well as close as I can tell. It also disconnects fairly quickly. When measuring across the FET drain to source, I measure rectified mains when I unplug the power. This gradually fades as the capacitor discharges through a very high value resistor and an LED (sandwiched between the relay and the cap). The charge in the capacitor is blocked from returning to the AC legs via the bridge rectifier. I do not measure voltage across the FET drain source unless the auxiliary voltage circuit is up and running. I cannot be sure as I don't have the board in front of me, I suspect that the relay is there as a protection device i.e. It will only switch the rectified DC power rail through if the auxiliary power circuit is up and running (The circuit that the TNY266 drives). So the micro controller and all it's logic. The TNY266 that I ordered for the first board has arrived, so I will have a look in detail at the relay circuit. If I find that the function is different, I will update this post. Cheers Craig
@@foulkesbrau3085 Thanks so much for that explaination Craig. I work on commercial treadmills for the YMCA and what I usually run across is boards that supply 3 phase AC inverter output from single phase AC 115V. It uses a booster circuit after the AC rectifier, goes through a hugh inductor and CAP chopped by FET and Diode to boost DC Buss then through a inverter and brake chopper, out to 3 phase motor. Usually I just replace these drive cubes (Advanced Drive Technologies) www.board-repair.com/loader.php?Ticket=051820180070. These boards are about $1,000 ea. I had a spare board I've torn down and have been working toward drawing out the circuit best I can, trying to figure it out. Your videos help so much!!!!!! If I can save my employer some doe it helps them with their mission. You are the best. Thanks again :->
Hi Andre, I find with most of these boards - download the data sheet for the control chip. They normally have typical application circuits and most of these guys follow that to a T. From there it’s basically like LEGO - you put all the blocks together. I try not to use a scope in the repair videos as most people would not have access to one nor would they be able to use it safely on these types of circuits. So I use things that most people would have - multimeter etc. I must dash though - a scope makes things so much easier and quicker to fix. I’m glad the videos help. I’ve not come across the board types you’re dealing with. We have 240VAC mains here. So no need for inverters or three phase motors. Although I would love to get my hands on one just to get a look at the circuitry. Cheers Craig
@@foulkesbrau3085 I would be more than happy to send you the remenents of the unit I have dissassembled. It would be I think cheap enough to send without the heavy componets (the inductor alone weight a kilo and a half) I will include pics and data on the removed componets. How do I get your address?
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Plz help i have exactly like the one on the right and i have problem with R63 ,R65 and R64 it blown up and i can't detect thier numer to be replaced can you tell me of the resistant number
WOW!!! Craig, that was amazing troubleshooting techniques. Really interesting, informative and helpful, such insight!!!!
Tell me if you have time to repsond. What is the purpose of the relay on this board? I am thinking it is a inrush current limiter with such a large capacitor? I've seen this on other boards where the relay is in parallel with a large resistor. Thank you so very much for all your time and effort on these wonderful videos, especially concerning exercise equipment boards.
Hi Andre,
I'm guessing here as I have never looked at the relay part of the circuit. I don't recall any inrush current limiting devices - normally an NTC resistor. There were also no large power resistors.
The relay switches in immediately - well as close as I can tell. It also disconnects fairly quickly.
When measuring across the FET drain to source, I measure rectified mains when I unplug the power. This gradually fades as the capacitor discharges through a very high value resistor and an LED (sandwiched between the relay and the cap). The charge in the capacitor is blocked from returning to the AC legs via the bridge rectifier. I do not measure voltage across the FET drain source unless the auxiliary voltage circuit is up and running.
I cannot be sure as I don't have the board in front of me, I suspect that the relay is there as a protection device i.e. It will only switch the rectified DC power rail through if the auxiliary power circuit is up and running (The circuit that the TNY266 drives). So the micro controller and all it's logic.
The TNY266 that I ordered for the first board has arrived, so I will have a look in detail at the relay circuit. If I find that the function is different, I will update this post.
Cheers
Craig
@@foulkesbrau3085 Thanks so much for that explaination Craig. I work on commercial treadmills for the YMCA and what I usually run across is boards that supply 3 phase AC inverter output from single phase AC 115V. It uses a booster circuit after the AC rectifier, goes through a hugh inductor and CAP chopped by FET and Diode to boost DC Buss then through a inverter and brake chopper, out to 3 phase motor. Usually I just replace these drive cubes (Advanced Drive Technologies) www.board-repair.com/loader.php?Ticket=051820180070. These boards are about $1,000 ea. I had a spare board I've torn down and have been working toward drawing out the circuit best I can, trying to figure it out. Your videos help so much!!!!!! If I can save my employer some doe it helps them with their mission. You are the best. Thanks again :->
Hi Andre,
I find with most of these boards - download the data sheet for the control chip. They normally have typical application circuits and most of these guys follow that to a T.
From there it’s basically like LEGO - you put all the blocks together.
I try not to use a scope in the repair videos as most people would not have access to one nor would they be able to use it safely on these types of circuits. So I use things that most people would have - multimeter etc. I must dash though - a scope makes things so much easier and quicker to fix.
I’m glad the videos help. I’ve not come across the board types you’re dealing with. We have 240VAC mains here. So no need for inverters or three phase motors. Although I would love to get my hands on one just to get a look at the circuitry.
Cheers
Craig
@@foulkesbrau3085 I would be more than happy to send you the remenents of the unit I have dissassembled. It would be I think cheap enough to send without the heavy componets (the inductor alone weight a kilo and a half) I will include pics and data on the removed componets. How do I get your address?
Hi Andre - my email: craig at FoulkesBrau dot com.
Sir Hindi translation