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Darren
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Joined: 1-March 06
Profile Views: 411*
Last Seen: 3rd February 2009 - 01:27 PM
Local Time: Sep 3 2010, 11:01 AM
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24 Jan 2009
I have a lathe with a Fuji VFD that appears to be suffering from a loss of power. If I remove all the mechanicalaspects of this problem I am left with the fact that I can significantly slow down a 37KW Spindle motor with a short(30") 2x4. Firstly the owner of the machine sent the drive out for test/repair to the Fuji distributor in California. They said the drive is fine and it ran on load without problem. Then they installed a new PLG on the motor. Then they called me, I should have stayed home. I checked the motor with the megger, no problems. Then I checked the current to the motor when the motor was under load. I had the motor running at 3000rpm, 4800 is max, and measured 80 - 90amps each leg. So I removed all the belts so it was just the motor. Itstarted fine and got up to speed as expected. Then with the 2x4 on nthe pulley I was reading 90 amps on all legs and was able to slow the motor by 1000rpm. I removed the motor and off to the motor shop I strode. The motor guy duly opened the motor and tested. ohmemeter says windings OK growler says rotor ok.
Where do I go now?? What can be wrong with the motor to allow this to happen? How does torque limitation work? does it limit the current ? thanks in advance Darren
2 Dec 2008
I know this should be a simple deal but it appears I am having a real brain block. I need to start and stop a motor fwd and rev, simple right. But I aslo need to stop this motor with a plugging switch. I have a n/o for both fwd and rev in the plugging switch.
So start motor and latch, stop motor and brake it both fwd and rev. Please help!! it's real late and I wont to go to bed. Thanks
27 Nov 2006
Does any body have ANY documentation on this drive? I have many in my area and retrofitting is fast becomming a requirement. However without any I/O information it's kinda hard so any help would be great.
Thanks Darren
23 Jun 2006
I have a motor from China 12 lead and the label says it can be connected either low or high voltage 220/440 in Delta or Wye. So there are 4 different options of which 2 are dictated bye supply voltage. So we are left with delta or Wye for running. What are the characteristics of the 2 connections? The application is a spindle motor on a machine tool.
21 Jun 2006
I have a wound rotor motor (200hp) with resistors for starting etc. There are 6 resistors 1 stays in circuit all the time and one is stated to be for braking. This one is the last in the circuit and is jumped across one side to complete the circuit. The problem I have is that the other 4 resistors are not equal steps. There is 1 large step maybe 60% then a 20% a 10% and another 10%. My question is should the 60% be the first step or the last step? The application is a plate roll. We have replaced all the original controls with a PLC. We got this machine in pieces and most of the electrical panel was missing. the original prints do not show different resistors just resistors.
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Lo-Fi Version | Time is now: 3rd September 2010 - 05:01 PM |
