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  1. M

    Whirlpool L1373 repair attempt

    Thanks for the schematic! R033 was indeed the suspected resistor, but it checked out fine when out of circuit so that was a bust, as was the entire TRIAC gate circuit. I check every component between the TRIAC's gate and the main IC and everything was within spec. Unless the actual TRIAC is...
  2. M

    Which relay should I use?

    Current limiting is certainly possible, but then it seems logical to me that there also will not be a performance increase. Like i said, i don't understand how the motor will suddenly "speed up" just because you're increasing the voltage, so until that's clear, i'm not going to be much further...
  3. M

    Which relay should I use?

    Well i'm not entirely clear on how that motor determines it's rotational speed, i just know for a fact that induction motors are speed controlled through frequency of the input, not voltage or current. The line to line voltage is 152v yes, but the voltage over the windings of the motor is not...
  4. M

    Electrolux dishwasher pcb repair

    If you disconnect the power from the drain pump, the dishwasher will not start the program, it will just sit there. considering you unsoldered the gate, that's exactly what is happening. It seems the pump circuit is getting the signal to pump when it shouldn't, could be a short in a smaller...
  5. M

    Which relay should I use?

    Another something that occurred to me... Induction motors are frequency controlled, and so they only speed up if you increase the frequency. I'm not sure what you hope to accomplish by increasing the voltage over the coils then? Anyone have more experience with these types of motors can...
  6. M

    Which relay should I use?

    Afaik, the common is just a wire that connects all the end points together. You could hook a neuter upto this but it's not necessary. The controller (thing that turns DC into 3 phase AC) is just that, something that turns DC into 3p AC, it will be fed with 2 wires, positive pole and negatie...
  7. M

    Whirlpool L1373 repair attempt

    Yes, critical to speed control. However, the machine goes full blast as soon as the motor is energized, the tacho measures this and reports an error to the machine. So i'm thinking the tacho control circuit is doing what it's supposed to do, but the PWM control that feeds the TRIAC is not, and...
  8. M

    Which relay should I use?

    IT might, or then it might not. If a relay needs 48v to turn on, then it's better to use 48V, you might also want to have some sort of control circuit to make sure the voltage does not exceed 48v, but that sort of depends on how stable the voltage is to begin with. So getting back to the...
  9. M

    Which relay should I use?

    Because they have an inverter that turns the DC into a sort of AC. Owing to the brushless design they need to alter their current in order to work. So help me understand how you are wiring this motor then... The motor has 3 wires going into it? How are those hooked up to the battery (which is...
  10. M

    Which relay should I use?

    Good point, 3 phase motors don't take DC... Maybe it would help if you supplied the motor type?
  11. M

    Which relay should I use?

    Have a look at this, you can make your own ;-) High current mechanical relays will be bulky, there's no way around that as the materials needed to withstand the current are bulky, SSR with SPDT are hard to find, and will likely also be bulkier than SPST ones. I guess then your best option is to...
  12. M

    Whirlpool L1373 repair attempt

    Tumtidum, Replaced another shorted MMUN2132 today. The MMUN powering K2 relay coil was also fried, I also replaced the K3 one because it gave off weird reading in circuit, seemed fine once isolated but seeing as it was off anyway i did replace it also. The motor spins up now, but halas it...
  13. M

    Which relay should I use?

    Hi, I was referring to the coil of the switch not the actual switch, which is just a contact that can/will handle anything up to it's rated spec. Using an AC coil on DC can cause said issues. This has nothing to do with the actual switch which is just a contact and will conduct whatever you put...
  14. M

    Which relay should I use?

    Yes but you're not using them within spec, see what steve said about inductive discharge, you'll be putting a lot more than 88v into them when switching if you don't power down first. Using AC relays on DC power is problematic, you'll have to use overdimentioned relays (24v instead of 12v for...
  15. M

    Whirlpool L1373 repair attempt

    The MMUN2132 was replaced today, as it was clearly shorted. Putting the PCB back into the machine I am now confronted with another fault code, F06, motor tacho failure... which seems reasonable as the motor is not being powered. I cannot hear the relays engage on the board when trying to power...
  16. M

    PCB for Dishwasher repair

    You need to fix the short first or it will keep blowing. No, the short will most likely be in the PCB itself. If the short is external then a more likely fault on the PCB is blown transistors that act as switches, like the more beefy SOT223 ones, or even TO220 (motortriac). The blown 100 Ohm...
  17. M

    PCB for Dishwasher repair

    Hey Edd, I hate to be contrary, as you're obviously far more knowledgeable on electronics than me, but this contradict my experience with PCB failure in household appliances. Rarely have I seen "dry joints" be the actual cause of a PCB issue. Most frequently it's SMPS problems, smoked...
  18. M

    Boshe front loader WAE24460AU - Dead

    Turn the board around, there should be small IC there that makes the low voltage power... a TNY of LNK unit probably. You should test this component as it's likely shorted. If it's anything like the boards i've worked on, the resistor will act as a fuse, and so as long as the short exists, it...
  19. M

    PCB for Dishwasher repair

    Here this might help. The burnt component seems to be a capacitor. I could remove this capacitor and check it's value if that helps. If by "power resistor" you mean the large grey resistor near the relay, i can tell you it's not a 1Gohm resistor, off the top of my head i believe it's a 100 Ohm...
  20. M

    Whirlpool L1373 repair attempt

    So... I've inspected the machine thoroughly and found nothing wrong with it, furthermore the machine prompts the error almost instantly, before actually going into cycle, so I suspected that the fault is in the PCB itself. I've poked and prodded the PCB with my probes and found a strange...
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