532,016 active members*
3,293 visitors online*
Register for free
Login
IndustryArena Forum > CNC Electronics > Servo Motors / Drives > Yaskawa Varispeed 626VM3 Help
Page 1 of 2 12
Results 1 to 20 of 34
  1. #1
    Registered
    Join Date
    Jan 2012
    Posts
    0

    Yaskawa Varispeed 626VM3 Help

    Greetings,
    I have an inverter drive that is not happy. I have an F-905 error that keeps coming up. It is a problem with a thermistor, and I have found the thermistor and found the correct resistance with a potentiometer to keep me running. Well it only worked for a little while, and i cannot find the correct resistance again. So I believe that there is more to this problem. I have checked just about everything else and it all comes down the the drive itself. This is getting way above my head, and I was wondering if anyone had some suggestions where to get this thing fixed. I found Alfa-inc. and they have been fairly reasonable, with good turn around time. Also, is there any kind of upgrade that is out there? Thank for the help in advance!

  2. #2
    Registered
    Join Date
    Jan 2007
    Posts
    69
    The thermistor is used to sense the temperature of the heat sink. The firmware in the drive/inverter monitors this constantly and the checks for steady state readings. When it sees a steady state reading it figures the thermistor has failed.

    If you're competent enough to wire in a pot to fool the drive you should be able to do the following:

    1) Be sure the heat sink is as clean as you can get it using compressed air FROM A DISTANCE. Don't use 120 psi shop air from a home made nozzle an inch away from the circuit board. You can blast other stuff off the circuit board that you really need. Or create a short circuit without realizing it.

    2) Be sure all the power semiconductors are firmly seated against the heat sink. If any are loose you need to verify there isn't any dust, grit, etc. between the semiconductor and the heat sink. If the heat sink compound (white stuff) has dried out you need to remove the old and replace it. If you remove any semiconductor from the heat sink you need to be sure you get it mounted flat against the heat sink during re-assembly and USE FRESH HEATSINK COMPOUND.

    3) Check the cooling fan for proper speed. The bearings could be bad and the fan won't turn fast enough to keep the heat sink cooled. If it's questionable then replace it. www.jameco.com has a wide selection of fans. Don't worry so much about brand name, etc. Just match the voltage, physical size AND flow direction. They are cheap enough to have a spare and one day the mfg may decide to discontinue that version.

    4) Replace the thermistor. You might have better luck finding a replacement at Newark | US - Electronic Components Distributor | Electronic Parts Distributor, or Mouser Electronics. Use the same guidelines as when replacing semiconductors. While the thermistor isn't generating heat it needs to sense it accurately. Keep it clean, and firmly seated against the heat sink.

    Be careful, use your head, and DON'T FORCE ANYTHING to move. The semiconductor(s) may be adhered to the heatsink with nothing more than surface tension - which is GOOD and means there's nothing wrong there any nothing further needs to be done - but a mis-placed screw driver used as a pry bar can crack the semiconductor case and ruin it. Just be damn sure there isn't a screw holding it that you've missed.

    WC

  3. #3
    Registered
    Join Date
    Jan 2012
    Posts
    0
    That is all good information, thank you, but I still can't fool the drive anymore with the pot. So that is why I feel that my problem lies somewhere deeper than just in the thermistor.

  4. #4
    Registered
    Join Date
    Jan 2007
    Posts
    69
    Well, I thought I was giving you what you needed to repair your problem - not help you continue to limp along. I've repaired quite a number of DC drives and AC inverters over the years. And, thermistor faults were always related to what I have already outlined.

    Good Luck

  5. #5
    Registered
    Join Date
    Jan 2012
    Posts
    0
    I want to find out what exaclty my problem is. I had put on the pot to determine if the thermistor was the problem or not. I found the resistance value of 28k ohms to show a displayed temp of 18 degrees C. I found this temp by pulling up V1-13 on the display of the inverter. The problem is that it worked for a little while. With the junk thermistor it would read a temp of -24.0 to -30.0 degrees. Why can i not bring up the display of V1-13, showing that thermistor, and I can attach my pot and vary the ohms from 1k to 400k and the temp not change? I think this is telling me that even if i change the thermistor I'm still going to have problems.

  6. #6
    Gold Member
    Join Date
    Sep 2010
    Posts
    1743
    sounds like your thermistor input circuit is bad. most thermistors, NTC & PTC, have switch point or knee around a couple k; most drives have set point around 3-10k -- anything above is good, below bad -- or vice versa. none will have switch point over 100k. thermostats of course are 0 ohms or open so setpoint still set around 1k to trip. if you can go 1-400k then input is prob bad - unless your thermistor is a special one that is semiconductor based and polarity sensative like a KTY unit - then your pot will not simulate it correctly.

  7. #7
    Registered
    Join Date
    Jan 2012
    Posts
    0
    Thank you Mike! I guess I kinda figured it was bad. I just wanted to confirm what I was thinking. Do you recommend anyone to fix this for me?

  8. #8
    Registered
    Join Date
    Sep 2012
    Posts
    0
    Help
    I have a Hurco BMC 30/d\D with a Varispeed 626VM3.
    With a spindle not ready alarm
    Varispeed has a F200 code
    Is there any hope?

  9. #9
    Registered
    Join Date
    Jan 2007
    Posts
    69
    Quote Originally Posted by omf1 View Post
    Help
    I have a Hurco BMC 30/d\D with a Varispeed 626VM3.
    With a spindle not ready alarm
    Varispeed has a F200 code
    Is there any hope?

    Here's a link to the operator's manual which was a very simple matter of doing a google search using your text above:

    http://www.yaskawa.com/site/dmspindle.nsf/link2/TKUR-5EKT4M/$file/SIE-S626-6C.pdf

    The F200 diagnostic code refers to the internal magnetic contactor. Read the manual on page 205. Although the manual lists possibilities within the inverter I would check for proper external signals first. After you've verified all proper signals to the inverter, then suspect the inverter itself. Begin with the E-stop circuitry. Sometimes the internal fault relay contacts are wired in series with the E-stop input which is totally redundant and un-necessary and will have you sniffing out the wrong path. If that is the case you need to find out what caused the fault relay to trip and correct it.

    Going back to the e-stop (emergency stop) circuit. My prime suspect would be the e-stop panel switch. Most often a screw terminal loosens and a wire falls out. If wires are tight check the contact. With control power off use an ohmmeter to check continuity of the switch contact. Reading should be near zero ohms with e-stop switch out and infinity with the switch pushed in. I have made lots of money going to a trouble call only to find the e-stop was pushed in and no one knows "how it got that way."

    Careful poking around with a suspected loose connection as you may knock that loose wire into something with a higher potential and fry something you may need.

  10. #10
    Registered
    Join Date
    Sep 2012
    Posts
    0
    Thak you. That would be great.
    I will let you know

  11. #11
    Registered
    Join Date
    Sep 2005
    Posts
    29
    I Have a F602 / F604 alarm this was intermittent but now occurs at start up all the time!

    I understand that this is an input power alarm or phase out etc I have increased the supply power from 195V to 210V all three phases are present
    is this generally considered a repair scenario or is there anything I can do to fix.

    I have some experience in repairing inverters etc but this is my first 626VM3 fault and I have nothing more than the manual from this forum.

    Appreciate any guidance

  12. #12
    Member
    Join Date
    Jan 2005
    Posts
    11667
    Can you give more details on the Yaskawa Varispeed 626VM3 model numbers as we have these drives New in stock if needed
    Mactec54

  13. #13
    Registered
    Join Date
    Sep 2005
    Posts
    29
    Hi mactec54,

    Thanks for your reply my drive is a CIMR-VMS27P5 27P52 620409, I would need to price and re-installation procedure also.

  14. #14
    Registered
    Join Date
    Sep 2005
    Posts
    29
    .

  15. #15
    Member
    Join Date
    Jan 2005
    Posts
    11667
    gollame

    Does you drive look like these, or does it have a blue cover
    Mactec54

  16. #16
    Registered
    Join Date
    Feb 2011
    Posts
    100
    I have a Yaskawa 626VM3C CIMR-VMC25P5 that shows code F-602 from time to time. The manual says this happens when voltage falls below 210vdc. Is the VDC a typo? Also the drive is supposed to be rated at 200-220vac so why would it fault out at 210 v to begin with. Is this control voltage?
    Thanks

  17. #17
    Member
    Join Date
    Nov 2012
    Posts
    4
    Hello Friend

    any chance you remember how you remedied this problem, I have exactly the same situation on my inverter.

    Thanks

  18. #18
    Registered
    Join Date
    Feb 2011
    Posts
    100
    The serial control cable was frayed and caused the fault. It also burnt out the FSSB.

  19. #19

    Re: Yaskawa Varispeed 626VM3 Help

    Hello everyone

    I am reconditioning an old hitachi ht 25g. Variseed 626vm3c has been used to control the turret motor. I continuously get an error F-902. Since i am using encoder control, the connector 2CN is not used. Acccording to the manual, thermistor inputs have to be given to pins 8 and 9 of 2CN. I tried giving the input to those pins but the parameter V7-1 still shows temperature of -27 degree C. Apparently i somehow need to get this above -10 to get the drive to work. If anyone else has used encoder control and has been able to run the motor, please do let me know the connector and pin numbers where you connected the two thermistor wires. I just need to get the parameter V7-1 ro read something above -10 degree C.

    Thank you in advance !
    Experto Crede Machines Private Limited
    www.expertocredemachines.com

  20. #20
    Registered
    Join Date
    May 2014
    Posts
    4

    Re: Yaskawa Varispeed 626VM3 Help

    Hi guys, I have a 626vm3 with an f-600 fault can anyone help out?

Page 1 of 2 12

Similar Threads

  1. yaskawa varispeed 626vm3.
    By wilko1 in forum Servo Motors / Drives
    Replies: 4
    Last Post: 10-23-2019, 01:42 AM
  2. matsuura cnc with Yansac varispeed 626vm3 strange problem
    By ivision in forum Servo Motors / Drives
    Replies: 0
    Last Post: 03-30-2014, 07:56 PM
  3. Trouble Varispeed 626vm3
    By Fyp Engineering in forum Servo Motors / Drives
    Replies: 1
    Last Post: 06-17-2013, 11:49 PM
  4. yaskawa 626 varispeed
    By george9 in forum DNC Problems and Solutions
    Replies: 6
    Last Post: 10-15-2010, 12:45 AM
  5. Yaskawa Varispeed 626 MT
    By bradodarb in forum Phase Converters
    Replies: 1
    Last Post: 04-27-2009, 02:38 PM

Tags for this Thread

Posting Permissions

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