Hi All
I have a old 1988 Triac pnc3. My problem is the spindle will only spin in reverse!
You select forwards, give it a speed and enter. Then relay 3 (spindle reverse) energises, followed by the relay on the spindle control board, and the spindle starts to turn, in reverse!
It will now only spin in reverse although I have had it spinning forward.
Its the North east electronics board with the Brown & Prestal spindle control. 3 Phase motor.
Does anyone have any experience of the problem or any suggestions?
Spindle only spins in reverse (1988 Triac)
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Not sure of the electronics here, but I'm guessing faulty relay contacts if its all worked OK before and nothing else has changed.
The spindle drive will possibly have a single input for CW/CCW select.
The reverse relay will pull this input up or down to (5/24??? Volts DC or Ground??) - it could be that the function of this relay is actually NOT reverse when energised
Check for faulty or broken wire to the spindle drive or a dirty contact on the reverse relay - if the relay can be "made" by pushing a little button, then do an ohms test across the contact going to the drive.
Can you pull the relay out and try it again ?
The spindle drive will possibly have a single input for CW/CCW select.
The reverse relay will pull this input up or down to (5/24??? Volts DC or Ground??) - it could be that the function of this relay is actually NOT reverse when energised
Check for faulty or broken wire to the spindle drive or a dirty contact on the reverse relay - if the relay can be "made" by pushing a little button, then do an ohms test across the contact going to the drive.
Can you pull the relay out and try it again ?
