| Electronics > Repair |
| Sym proceed - zero cross switch repair (help needed) |
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| rena:
Hello, I recently bought a second hand zero crossing power distributor that doesn't work. I traced the schematic but I don't know much about alternating voltage (except for audio and PSU) so I can't make sense of it. It is centred around a solid state relay and two transistors. As far as I understand, when switched ON, one transistor turns ON an LED and the other one is supposed to close a relay. The solid state relay is in charge of the zero crossing. The LED do turns ON but the relay is no closed. I tested the relay off circuit and it is working. I first suspected the transistor so I changed it with a new one but it didn't fix the problem. At some point (before I receive the new part) I tried with a totally random part number (D2012) and of course it didn't fix the problem but it continuously switched the relay ON and OFF so something was happening at lease. From my understanding the full circuit is AC powered (?). Doesn't it need some DC at any point ? I don't want to bother anybody but I would greatly appreciate if someone could explain me this circuit and potentially help me fix it. *(+),(-),(~) and the solid state relay's terminals. N = Neutral at input L = Live at input N' and L' are the output |
| rena:
Pictures of the inside and the circuit itself. |
| squadchannel:
maybe this product. https://ameblo.jp/kawamura-tokei-megane/entry-12468662543.html https://web.archive.org/web/20150628122842/https://www.symproceed.com/powerconditioner/sp-pz8b.php Looking at the photos posted on the mentioned blog, there are areas that have been modified in the past. I think it would be a good idea to restore them to their original state. You could repair it, but as a last resort, there are products that have a zero-cross circuit built into the SSR. It may be a good idea to replace it. As an aside, TE is of the opinion that zero-cross switches shorten relay life and generate EMI and RFI. If I were you, I would not consider using them. https://www.te.com/en/products/relays-and-contactors/relays/intersection/zero-crossover-switching-transformers.html?tab=pgp-story japanese: https://www.te.com/ja/products/relays-and-contactors/relays/intersection/zero-crossover-switching-transformers.html?tab=pgp-story |
| rena:
Thank you for your message. Actually everything is in its original state and no parts have been changed. Any idea what could be the origin of the problem ? The SSR itself ? |
| squadchannel:
I have no idea about the circuitry, but the parts used are simple components and I can't see why they don't work. If I had to guess, it would be the SSR, but have you checked its operation by itself? :o In practice, a zero-crossing switch could be achieved by using a diode, a resistor and a capacitor to step down and rectify the voltage, and then inputting the voltage to an SSR. because the SSR used is a relay that operates at zero crossing. But after the SSR operates, the circuit has a common mechanical relay operating to bypass the SSR contacts. I don't understand why they are doing this. Presumably, this product is for audiophiles and was made with a focus on "sound quality". check to see if the SSR is working properly. |
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