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I understand. Unfortunately it seems like the tacho generator is not sold as a spare part, as far as I can tell. I’ll gladly stand corrected if anyone knows where I can get one. I think I’ll put a resistor across the terminals when I get a time to run a test. I’ll feedback any results.
Yes, iadom, I agree. Expensive parts to play bingo with. That is why I’d like to go a bit further with the testing. You made some interesting points regarding the tacho generator fault symptoms. I’m thinking that I might run the machine with a wire disconnected from the tacho generator, and also with a variable resistor connected instead. If the motor performs differently to what it is currently doing, then it could highlight a fault with the tacho generator. Do you know how the main PCB communicates with the motor control PCB? Do washing machines use serial data protocols? I’m wondering how the motor is ‘told’ which speeds and direction of rotation from the controller.
On the subject of sophistication, I find it strange that a manufacturer would design a machine that monitors the motor speed, takes preventative action in the case of sensor fault, but then does not provide a basic fault code to highlight that the machine has gone into fault. The machine in question does already present a number of fault codes for other reasons. However, in the current case, the machine just sits idle with no clue to suggest it has stopped. The only thing displayed is the remaining program time which does not change – even when power is cycled off and on again.
Thanks again for your support and interest.
iadom wrote:The manual doesn’t appear to list the tacho specs but looking at tacho’s in some old Hotpoint manuals the tacho resistance is between 175ohms and 250ohms. The resistance does vary when spun. The tachometers are all specific to the individual motors. When you say the motor runs for a second is this a very slow turn or a fast spurt of action? (Have asked this question already);)
Thanks for the reply, iadom. Sorry I haven’t replied sooner. The motor when connected to the drum with the belt turn the drum about half to one turn. With the motor belt disconnected, it seems to spin a few times. The movement seems smooth – not jerky at all. It is very quiet – definitely no bearing problems. It is hard to determine the speed at which it turns. The speed of the drum seems like when it is doing a standard wash. Not spin speed, and not an unusually slow speed either. It appears to be like the program is initiated by the main controller, but then a ‘faulty’ signal causes it to stop the motor again. That is why I considered there might be a problem with the tacho generator – if motor speed cannot be determined by the controller, then it initiates a machine stop. Are washing machine controllers that sophisticated?
Hello all,
Does anybody know what the tacho generator resistance should measure? The one on our washing machine motor measures approximately 1 mega Ohm and fluctuates slightly when I spin the motor by hand. Is this usual? Are tacho generators a generic item, or are they machine specific?
I’m wondering if I can get one from another machine to test out. Does anyone have any second-hand ISE machine parts I could purchase?
