PWM Idle mod on MS PCB 3.0
Moderators: jsmcortina, muythaibxr
PWM Idle mod on MS PCB 3.0
I was previously running PWM idle on my 2.2 board with the Bosch -516 valve. I have however moved on to 3.0 now and am having some problems. The firm who made me the MS 3.0 assured me the FIDLE transistor was upgraded to control PWM but it didn't work. It turned out to be a ZTX450 (max 1.0A)
The instructions below explain how to install a ZTX650 (max 2.0A) on a 2.2 board but not on a 3.0.
http://megasquirt.sourceforge.net/extra/pwmidle.html
My question is: Can I install the ZTX650 in Q4 instead of the ZTX450 and expect it to work? Installing a TIP-transistor seems like a lot more work. I just replaced the R16 and Q5 on the 2.2 and it was fine, does the 3.0 board not allow this?
The instructions below explain how to install a ZTX650 (max 2.0A) on a 2.2 board but not on a 3.0.
http://megasquirt.sourceforge.net/extra/pwmidle.html
My question is: Can I install the ZTX650 in Q4 instead of the ZTX450 and expect it to work? Installing a TIP-transistor seems like a lot more work. I just replaced the R16 and Q5 on the 2.2 and it was fine, does the 3.0 board not allow this?
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There is some difference regarding the flyback circuit but i do not have the schematics in front of me right now and i do not have time to check it either...
But if the 2N2222 is connected in the same way as on the 2.2 board there shouldn´t be a problem i guess .
But if the 2N2222 is connected in the same way as on the 2.2 board there shouldn´t be a problem i guess .
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The flyback also needs uprating. The V3 board as-is will not survive with PWM operation - the flyback zener is fine for an on/off relay operation but the energy from continual PWM operation will overheat it.
You'll have to check the schematics to see the base resistor in question.
James
You'll have to check the schematics to see the base resistor in question.
James
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MSEXTRA documentation at: http://www.msextra.com/doc/index.html
New users, please read the "Forum Help Page".