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badhabitrabbit
Member

Join Date: Dec 2011
Posts: 8

GE DC300 Puzzle

12/20/2011 8:13 AM

Morning all,

We have a GE DC 300 drive used for variable spindle speeds on a horizontal lathe with a two speed headstock controlled by a Fanuc 18TB cnc control. On the drive there are only two parameters that I'm aware of for selecting the ACELT & DCELT time. Parameters 057 & 058. To prevent the clutches from slipping I have selected a decelleration time of 15 seconds. It appears that for many years this drive has stopped the spindle motor in low range forward in the time selected with parameter 058 & quicker than the selected speed in reverse. High range forward brings the motor to a standstill in 6 to 8 seconds & high range reverse stops the motor in 2 to 3 seconds.

Any useful input to solving these puzzling events would be greatly appreciated.

Jerry

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SolarEagle
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Join Date: Mar 2007
Location: by the beach in Florida
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#1

Re: GE DC300 puzzle

12/20/2011 8:22 AM

This place is good for that....

http://www.cnczone.com/forums/index.php

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duffdr
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Join Date: Nov 2006
Location: Roscoe IL
Posts: 69
#2

Re: GE DC300 Puzzle

12/21/2011 7:20 AM

1st what kid of lathe is it? most every one I have every seen (20+ yrs machine tool repair) is belt driven with a synchro gear shifting no clutches.... and unless that spindle is running a chuck about 8ft in diameter and a REALLY high mass load why 15 secs? I have VTL's w/8ft tables and 54" under rail that stop in 4secs and anything smaller than that should go from full speed to stop in about 2.5 tops and almost instantly in low gear.

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duffdr
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Location: Roscoe IL
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#3
In reply to #2

Re: GE DC300 Puzzle

12/21/2011 7:25 AM

have you checked the parameters on the drive itself?

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badhabitrabbit
Member

Join Date: Dec 2011
Posts: 8
#8
In reply to #3

Re: GE DC300 Puzzle

12/21/2011 6:50 PM

That's my question...I only know of the two drive parameters, 057 & 058, ACELT & DCELT. Only low range forward is controlled by these parameters.

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badhabitrabbit
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Posts: 8
#4
In reply to #2

Re: GE DC300 Puzzle

12/21/2011 9:25 AM

This machine is an American. It originally had a smaller chuck, smaller spindle motor & drive. Now there is a six foot diameter chuck on it, a 75hp motor & drive. The clutches are the original size, 10" discs.

Yes the Bullards & G & Ls acellerate & decellerate in 2 to 3 seconds. None of these machines have had larger chucks installed.

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duffdr
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Location: Roscoe IL
Posts: 69
#6
In reply to #4

Re: GE DC300 Puzzle

12/21/2011 10:41 AM

our VTL is a older Bullard Dynatrol w/86"chuck and 75hp dc that has been converted over from the original AB controls to Fanuc 15m w/Parker 590 drive to control motor... so this has a wet clutch setup similar to older Webster bennett's?

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badhabitrabbit
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Join Date: Dec 2011
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#7
In reply to #6

Re: GE DC300 Puzzle

12/21/2011 6:45 PM

Yes this machine has wet clutches.

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Rockyscience
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Join Date: Sep 2011
Location: Near the New Madrid Fault. USA
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#5

Re: GE DC300 Puzzle

12/21/2011 9:32 AM

Is there a contactor(s) feeding the drive with a brake resistor involved in the Run/Stop comand?

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badhabitrabbit
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Join Date: Dec 2011
Posts: 8
#9
In reply to #5

Re: GE DC300 Puzzle

12/21/2011 6:52 PM

Oh yes, I forgot to mention it's a regenerative drive without a dynamic braking resistor. There is an armature main 'MA' contactor but no dynamic braking resistor.

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Previous in Forum: Explosion Proof Instrument and Ingress Protection   Next in Forum: About Heat Shrinkable Sleeve Joint (Canusa Cps Product)

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