Failed triac motor speed control

edwardsjc · Post by **edwardsjc** » Mon 12 Mar , 2012 13:38 pm

Hi

I have my eye on a Triac mill from around 1994. The spindle speed control doesn't work, so the spindle only runs very slowly.

In the worst case, how much is it likely to cost to fix ?
Are there any common motor speed control failures ?

Sorry if this is a bit vague.

Thanks

Jason

Post by **Denford Admin** » Mon 12 Mar , 2012 18:03 pm

I'm sure I've read about others who have replace the drive before on here - it's just a case of finding those posts again to see what they fitted...

I'm sure the motor is a DC SEM which Denford also fitted to lots of other machines like: Novamill, novaturn, starmill, starturn, orac

Failure will either be the spindle drive or the motor brushes / armature is worn out.
The motor tacho could also be an issue - not sure if it's used on every drive.
It could also be the 0-10v speed command signal to the drive which is faulty but this is less likely.

Martin · Post by **Martin** » Mon 12 Mar , 2012 19:23 pm

You will need to check the analogue voltage in to the drive.

If it is a standard Triac PC or Triac VMC it will have a Sprint 1200 fitted,

If it is a Triac Fanuc then it will have a sprint 1600i fitted.

edwardsjc · Post by **edwardsjc** » Tue 13 Mar , 2012 10:33 am

Thanks for the information so far !

Can I tell if its a TRIAC Fanuc/PC/VMC from the serial number, which is 40202 A, manufactured May 1994.

Thanks

Jason

Post by **Denford Admin** » Tue 13 Mar , 2012 10:53 am

The oldest electronic record I can find is, unfortunately, December 1994 which is serial 41124D
I'm not sure the paper records are still around...

edwardsjc · Post by **edwardsjc** » Tue 13 Mar , 2012 12:12 pm

The machine is described as "Fully enclosed and with a 6 station
tool changer,and Fanuc or Heidenhain simulated interchangeable
controls."

Does this help to identify which type of drives its likely to have ?

Thanks

Jason

Post by **Denford Admin** » Tue 13 Mar , 2012 12:45 pm

It'll probably be the Sprint 1200
viewtopic.php?t=634
http://denfordata.com/bb/viewtopic.php?f=15&t=2275

edwardsjc · Post by **edwardsjc** » Tue 13 Mar , 2012 12:59 pm

Sorry, forgot to say, the chap selling the machine tells me the spindle runs at approximately 500 RPM. Does this help to narrow down the likely problem ?

Thanks

Jason

Post by **Denford Admin** » Tue 13 Mar , 2012 13:12 pm

Does this help to narrow down the likely problem ?

Not really - it could still be the motor /drive / drive adjustments / analogue input at fault.

Denford Software & Machines

Denford Software & Machines

Failed triac motor speed control

Failed triac motor speed control

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