×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

siemens micromaster 440 vfd

siemens micromaster 440 vfd

siemens micromaster 440 vfd

(OP)
I have a Siemens micro-master 440 vfd to control a 7.5 kw,1400 rpm induction motor.now the problem is after running for few days it stops automatically without showing any fault & doesn't accept start command for next few hours or so until i clean it with air.I have replaced the drive two times,but problem remains the same.I have checked the parameters & found them okay. For information i must tell that the drive stays continuous in operation without rest & the room is non ac & bit dusty too.So I personally think that, may be the continuous operation of drive causing some internal component of control card heated & as a result it triggers off command.please ask for details if you want any.thank you.

RE: siemens micromaster 440 vfd

Is the dust conductive?

RE: siemens micromaster 440 vfd

Quote (OP)

...doesn't accept start command for next few hours or so until i clean it with air.
Have you considered moving the drive to an area with no or little dust? Some way to keep the dust out of the drive?

Bill
--------------------
"Why not the best?"
Jimmy Carter

RE: siemens micromaster 440 vfd

Generally of a drive overheats, there is a fault message telling you that. I take it from your description that this is not happening, correct?

One thing I experienced several times with MM440s is that if you are remotely mounting the display, such as on the door of a larger enclosure, the connector cable between the drive and display will become loose and it shuts down the drive. It could be that in your process of cleaning it, you are wiggling it again and it reconnects.


"You measure the size of the accomplishment by the obstacles you had to overcome to reach your goals" -- Booker T. Washington

RE: siemens micromaster 440 vfd

(OP)
first of all thanks for responding to the post, mates.
let me tell you few things...
1) the dust is conductive.
2)the vfd can not be moved in other place because it runs a screw extruder machine..bulky in size.it got to stay in lab where it is now.
3) the vfd HMI is mounted on vfd body,with no extension cable for remote mounting.
4) In the case of ABB acs series the fault message appears in case of inverter overheating but not sure about MM440.neva saw that msg.
I have also encountered a problem of loose HMI..which could be a probable cause of drive shutdown.so I have replaced the HMI with new one,but problem of automatic shutting down without alarm has not been resolved.

Recently I have experimentally removed a cable of TORQUE OUT PUT of VFD to PID controller & guess what? the machine is running okay now.
I anticipated that thing without any proper reasoning really.So now two questions are there,

1) why the vfd was stopping automatically without showing any tripping alarm?
2) how the removal of torque output of vfd to pid controller resolved the problem?

RE: siemens micromaster 440 vfd

Would this be a co-incidence?

If you remove the control connection, the VFD may not perform the basic function which it is intended. Be careful!

RE: siemens micromaster 440 vfd

(OP)
no dear only the torque signal to remote pid is bypassed..no issues with vfd performance.
its not co incidence by the way.I faced tripping off this vfd with HIGH torque alarm many times previously..I am just trying to find out the missing links between all those tripping & shutdown incidences occurred with this drive.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources