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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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#1
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Jog on a lathe
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#3
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Jog on a lathe
On Fri, 20 Jan 2006 15:46:56 -0800, xray wrote:
... I set it up for 3-wire (C001 = 20, C002 = 21, and C003 = 22.) This is more like the original lathe controls with Start, Stop, and F/R. I set C004 = 06 for Jog. When jog is closed, the operation of start, stop, and F/R are modified to run very slow, but there seems to be no sensible way to get it to move in jog mode with just one button. ... I had the same issue. The jog was just another preset speed. Add a diode from the jog button to the run forward. Then when you push the jog button it will set the speed and start the motor. I used an 1N4003 because I had them lying around. Wayne D. |
#4
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Jog on a lathe
In article ,
lid says... On Fri, 20 Jan 2006 17:02:12 -0500, Ned Simmons wrote: I've never used that drive, but I just took a quick look at the "Quick Reference Guide"... http://www.hitachi.us/supportingdocs...s/Support/L200 _QRG_NB6601XA.pdf Look at Func Codes C001 thru C005 on p.20 and the corresponding option codes on p.23 . I assume you're using the defaults for C001 and C002 which make terminals 1&2 the RUN/STOP terminals. Try changing C003 to code 06, which appears to make terminal 3 function as a jog input. I'm extrapolating from experience from other drives, so you ought to read the doc about these functions in the full manual, but I'm quite sure this will get you started in the right direction. Thanks for the reply, but I have read the full manual. The defaults for C001 and C002 set 2-wire mode. I think this sucks for a lathe. One button is forward-run while closed and the other reverse-run. I set it up for 3-wire (C001 = 20, C002 = 21, and C003 = 22.) This is more like the original lathe controls with Start, Stop, and F/R. I set C004 = 06 for Jog. When jog is closed, the operation of start, stop, and F/R are modified to run very slow, but there seems to be no sensible way to get it to move in jog mode with just one button. The function of jog is described in the full manual: http://www.hitachi.us/supportingdocs...on_NB660XA.pdf on page 4-15 (143 of 280.) That description talks about the default 2-wire control signals, but it works the same with 3-wire -- just replace the transitions of [FW], [RV] in the figure with [Start], [Stop] modified by [F/R]. I have used 2-pole switches for Jog and the Run button, so that I can make the Run button momentary in Jog mode (Stop is applied when the Run button is released, rather than having to hit the Stop button as in normal mode.) This seems to be the best I can do unless I burn my own microcontroller to toggle control lines for Jog. After looking at the manual I can't see an obvious mode of operation that will do what you want either, but I wouldn't give up without talking to tech support at Hitachi. The manual seems pretty good, but there may be some non-obvious setup that'll get you what you want. Failing that, I don't think you'd need a uP to get the job done. Set up a pair of cube relays and 3 PBs to emulate a reversing motor starter and set up the drive for 2-wire control (p 4-12). Add two PBs that invoke the jog speed and energize the relays without latching them and I think you've got what you need. You may find that you don't need the jog speed at all. It may be more convenient to adjust your speed pot for jogging rather than having a fixed jog speed. Ned Simmons |
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