Mazak Overvoltage Alarm QT15N T32-2
Close
Login to Your Account
Likes Likes:  0
Results 1 to 6 of 6
  1. #1
    Join Date
    Jan 2012
    Location
    Montana USA
    Posts
    3
    Post Thanks / Like
    Likes (Given)
    0
    Likes (Received)
    0

    Default Mazak Overvoltage Alarm QT15N T32-2

    So I have 2 1993 Mazak QT15N lathes, One has run fine for over 15 years and the other keeps having issues. Machine keeps getting an over voltage alarm followed by a Print circuit alarm if you don't wait long enough when you re start it. I've had the Control rebuilt by Mitsubishi and the Spindle Drive repaired by precision zone in Chicago. My incoming line voltage runs about 250V . Both machines are set up exactly the same. On the problem machine though, if I keep the control door open and run a fan in the back, it will run all day no problem. Any ideas of whats going on? Possible fixes? FR-SF Board? Power Supply ?

  2. #2
    Join Date
    Sep 2006
    Location
    Abingdon, VA
    Posts
    3,733
    Post Thanks / Like
    Likes (Given)
    4961
    Likes (Received)
    3713

    Default Mazak Overvoltage Alarm QT15N T32-2

    Make sure your incoming transformer taps are set for 240-250 volts incoming.

    Most Japanese CNC machine’s operate on 200 V internally, so make sure that’s what your drives are seeing. If they are seeing more than 220 volts, you can have problems!

    And yes, the FR-SF power supplies run really hot, and are know to fail (all capacitors replaced usually fixes). Precision Zone probably only replaced a couple of bad caps, instead of doing them all. (A whopping $20 worth to do them all.)

    I add an auxiliary muffin fan inside the cabinet to move air across the FR-SF power supply (SF-PW).

    ToolCat Greg

  3. #3
    Join Date
    Jan 2012
    Location
    Montana USA
    Posts
    3
    Post Thanks / Like
    Likes (Given)
    0
    Likes (Received)
    0

    Default

    Thanks for the reply, I did reset the taps on the transformer when I got the machine. I think I'm gonna try replacing the power supply first. I've looked to see if the led on it was out when the machine alarms out, it doesn't seem to but that probably doesn't mean that still not the problem may just blink off and on before I get a chance to see it.

  4. #4
    Join Date
    Sep 2006
    Location
    Abingdon, VA
    Posts
    3,733
    Post Thanks / Like
    Likes (Given)
    4961
    Likes (Received)
    3713

    Default

    The SF-PW led should be on anytime the main machine breaker is on...unless you have a drive alarm.

    Check EBay for SF-PW power supplies (be careful, as many are in China, and it takes about a month to get something from there!)

    The SF-PW30’s are an updated, more reliable power supply, so you might want to look for one of them.

    ToolCat

  5. #5
    Join Date
    Jan 2012
    Location
    Montana USA
    Posts
    3
    Post Thanks / Like
    Likes (Given)
    0
    Likes (Received)
    0

    Default

    So is that a direct replacement?

  6. #6
    Join Date
    Sep 2006
    Location
    Abingdon, VA
    Posts
    3,733
    Post Thanks / Like
    Likes (Given)
    4961
    Likes (Received)
    3713

    Default

    Yes, the SF-PW30 is a direct replacement for the SF-PW.

    The 30 has higher current and heat handling capabilities.

    ToolCat


Tags for this Thread

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •