tda1085 & triac problem

techsifnos

New Member

Join Date: Nov 2017

Posts: 7

Country: ATHENS
#1

tda1085 & triac problem

10-26-2021, 07:31 AM

Hi
I have a problem with a tda1085c circuit.

The board has 2 terminal switch with a moving shaft.There are 3 positions. Position 0(motor stopped) posistion 1(right-handed rotation) and position 3(left-handed rotation).At the same time, moving with the shaft a potentiometer to adjust the speed.
if it has been pressed position 1 or 2 and after turn on the main power switch(230v), everything is ok with universal motor.
If i turn on the main power switch and press the terminal switch from position 0 to position 1 or 2 the motor starts with high speed and stabilizes in the right speed.The change of direction takes place with relays.

I have tried to change the potentiometer, but the problem is with the spikes from switches and the triac(bta26-700b)
Also i have tried to put electrolytic capacitors on switch contacts and gnd, but the problem remains.

video : https://files.fm/u/qmtjcx3rv
Could you help me?
Thank you
Attached Files

Last edited by techsifnos; 10-26-2021, 08:14 AM.
Tags: None
eccerr0r

Solder Sloth

Join Date: Nov 2012

Posts: 8670

Country: USA
#2

11-08-2021, 01:52 AM

Re: tda1085 & triac problem

not sure what the proper behavior should be?
what is this motor for?
is the high speed improper?
Why does this control have a potentiometer on it in the first place, wouldn't it be easier to have a 3-position center off toggle switch and do away with the potentiometer?
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stj

Great Sage 齊天大聖

Join Date: Dec 2009

Posts: 30934

Country: Albion
#3

11-08-2021, 05:28 AM

Re: tda1085 & triac problem

i dont even understand the question.
is it blowing the triacs?
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tda1085 & triac problem

tda1085 & triac problem

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