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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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Motor running the wrong way
A friend asked me to come and help him swap the motor on a small table
saw today. Anway the new motor was already in when I arrived - much the same location as the previous one, with pullys and belt suitably set and adjusted. So I wired it up via a NVR switch with built in adjustable current trip, plugged it in, pushed the button, and it all sprang into life. Then we noticed the saw blade was going round the wrong way! The motor is about 1.5hp I would guess looking at the size of it. It was reclaimed from something else and hence the original plate lable is now mostly unreadable. I am not sure what type of motor it is, but there is no external start capacitor visible. Also when it spins up I could not hear a click from a centrifugal switch (not that this is any guarentee that it does not have one). So taking the cable entry plate off reveals six connection studs - one of which is earth. The others are arranged thus (the letters are those marked by each stud): # Z # T # S # A # Az The incoming mains is currently connected to A (Neutral) and Az (Phase) In addition there are also wires that emerge from the motor body and connect to the terminals: A Red and Black (+ mains in Neutral) Az Red and Red/Blue linear stripe (+ mains in phase) S 2 of Red/Green radial stripe Z Black and 2 of Red/Green radial stripe T Red/Green radial stripe and White The red and black wires have a little slack in them and look as if they could be repositioned to alternative connection points. Sugestions for an alternate wiring pattern to get it spinning in the other direction? -- Cheers, John. /================================================== ===============\ | Internode Ltd - http://www.internode.co.uk | |-----------------------------------------------------------------| | John Rumm - john(at)internode(dot)co(dot)uk | \================================================= ================/ |
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