Hello,
I have a number of speed control boards I would like to try and fix and improve , I am reasonably new to electronics and am keen to learn and understand as much as I can about this type of controller.
The PCB powers a 50v DC brush motor ,low speed 400rpm (15v) through to 1400rpm(40v),(Input is 230v 50hz UK)
*looking at the circuit diagram I assume its a DC output full wave SCR controller ? (confirmation of this would be helpful)
* some have failed diodes D5 and D8 (IN5408)
*A couple have failed SCRs TR1 and TR2 and seems to allow AC voltage into the motor ?(TYN612M)
*I would think that D1 and R5 are for reverse EMF ?
I would very much welcome any help or advice on improvements or upgrades I could carry out to make the PCB more robost / reliable / protect the motor from AC voltage.
Thank you in advance ,Aspiespot.
I have a number of speed control boards I would like to try and fix and improve , I am reasonably new to electronics and am keen to learn and understand as much as I can about this type of controller.
The PCB powers a 50v DC brush motor ,low speed 400rpm (15v) through to 1400rpm(40v),(Input is 230v 50hz UK)
*looking at the circuit diagram I assume its a DC output full wave SCR controller ? (confirmation of this would be helpful)
* some have failed diodes D5 and D8 (IN5408)
*A couple have failed SCRs TR1 and TR2 and seems to allow AC voltage into the motor ?(TYN612M)
*I would think that D1 and R5 are for reverse EMF ?
I would very much welcome any help or advice on improvements or upgrades I could carry out to make the PCB more robost / reliable / protect the motor from AC voltage.
Thank you in advance ,Aspiespot.
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