Hello to everybody!
My favourite electric sander broke down last week, the pcb of the speed control switch cracked somehow. I would like to get it working again but don't know if it is possible.
The sander is a old one and there is no support for spare parts is uses 220VAC and has an seperate on/off switch and a dial speed control switch 6 speeds (if I select the 6th speed it triggers a mechanical bypass contact).
The circuit on the switch itself is:
I opened up the speed control switch and found a BT08-600C Triac mounted to a heatsink.
This is the switch itself:
1. black wire: goes to the on/off switch which connects it to the blue wire from the power cord.
2. red wire: goes to the motor only
3. red/black crimped together: red goes to motor but on opposite end of other red wire, black goes to on/off switch which connects it to brown wire from the power cord.
Could someone please explain me how this circuit works? What is the 3rd (red/black crimped together) wire for (is it going to the gate of the triac?)?
Is it possible to fabricate something simular with a seperate potentiometer?
Any help would be highly appreciated.
Thanks,
Sparky007
My favourite electric sander broke down last week, the pcb of the speed control switch cracked somehow. I would like to get it working again but don't know if it is possible.
The sander is a old one and there is no support for spare parts is uses 220VAC and has an seperate on/off switch and a dial speed control switch 6 speeds (if I select the 6th speed it triggers a mechanical bypass contact).
The circuit on the switch itself is:
I opened up the speed control switch and found a BT08-600C Triac mounted to a heatsink.
This is the switch itself:
1. black wire: goes to the on/off switch which connects it to the blue wire from the power cord.
2. red wire: goes to the motor only
3. red/black crimped together: red goes to motor but on opposite end of other red wire, black goes to on/off switch which connects it to brown wire from the power cord.
Could someone please explain me how this circuit works? What is the 3rd (red/black crimped together) wire for (is it going to the gate of the triac?)?
Is it possible to fabricate something simular with a seperate potentiometer?
Any help would be highly appreciated.
Thanks,
Sparky007