530,042 active members*
3,808 visitors online*
Register for free
IndustryArena Forum > MetalWorking Machines > Haas Machines > Haas Mills > VF1 Low Voltage Power Supply Problems.
Results 1 to 4 of 4
  1. #1
    Join Date
    Jan 2010

    VF1 Low Voltage Power Supply Problems.

    I think I'm having a problem with my low voltage power supply. Here's the scenario:

    Turned machine on. No problems. Did a manual tool change and it went well. Went to do another manual tool change and the screen said "please wait" at the lower left corner. Then the screen went entirely blank. I tried to get something to happen on the keyboard and got nothing. No beeps. No actions. Nothing. I turned off the machine at the control panel (HARD POWER OFF). Powered up again. The contactors came on. Fans and spindle drive came on. CRT monitor light came on but still a blank screen and no results from pushing keys or buttons. Powered down again. Opened back cabinet and powered back on. No LEDs on main PCB are on. Not even the "5 volt" low voltage supply light came on. The unusual thing was the faint clicking sound coming from the low voltage power supply. I powered down again and the clicking sound went away as the control powered down.I checked the fuses and found the FU3 was blown. Replaced that and powered up but no change. Powered down and rechecked fuse. All are OK. I am stumped.

    So. What do the masses think the problem is? I am leaning towards the low voltage power supply unit. Is there a way to check this without getting a new one? I've done some micro electronic work before and was just wondering if I'm wasting my time. Thanks in advance,

    Bruce Mowbray
    Springville, PA

  2. #2
    Join Date
    Sep 2006
    Sounds to me that if the 5 volt kight did not come on, you should check with a multimeter to see if you actually have 5 volts and 12 volts coming out of the power supply. This will tell you if it is in fact, a bad unit. Hope this helps.
    Just a good ol' boy, never meanin' no harm.

  3. #3
    Community Moderator Al_The_Man's Avatar
    Join Date
    Dec 2003
    Disconnect the load side and with it powered up, check the output voltage, maybe a loading problem.
    CNC, Mechatronics Integration and Custom Machine Design

    “Logic will get you from A to B. Imagination will take you everywhere.”
    Albert E.

  4. #4
    Join Date
    Mar 2008
    It might be the low voltage power supply board.It happen to me about 2 years ago .

Similar Threads

  1. BMC20 Low Voltage Power Supply
    By Rally in forum HURCO
    Replies: 0
    Last Post: 08-06-2009, 11:28 AM
  2. Lowering Power supply Voltage?
    By tesart in forum General CNC Machine Related Electronics
    Replies: 2
    Last Post: 12-12-2008, 02:43 PM
  3. Voltage regulator on a CNC power supply
    By boatlover in forum General CNC Machine Related Electronics
    Replies: 0
    Last Post: 06-10-2008, 05:00 AM
  4. power supply voltage question
    By Monte in forum Stepper Motors / Drives
    Replies: 3
    Last Post: 03-07-2008, 05:06 AM
  5. Power supply voltage too high
    By spoiledbrat in forum General CNC Machine Related Electronics
    Replies: 8
    Last Post: 06-14-2005, 03:39 AM

Posting Permissions

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