Manufacturer recommends new inverter

[FFAMN]

I am relatively new to CNCZone. This is my firt post. Recently I purchased a one year 6 x 10 router equipped with a 5 hp 3 phase spindle, a LG inverter (model SVO55iS3-2), tool changer and a controller with Wincnc. The machine is approx.1 year old. I spoke to the manufacturer of the machine prior to purchaing it and they assurred me they would continue providing free tech support if I bought it. I have the router up running but learned from the previous owner they did not use the tool changer even though they ordered it with a tool changer. Upon contacting the manufacturer I am told the LG Inverter needs to have a dynamic brake installed and this brake may not be compatible with WinCNC. They are uncertain on the cost of equipping this inverter with a brake and recommended I may want to replace it with an inverter already manufactured with a brake. Does their recommendation sound reasonable?

I do appreciate anyone's else.


FFAMN

[Mike Nash]

While you COULD add an external braking unit. It will probably cost as much or more as a new drive with the braking transistor built in. Sad but true. You'll need external resistor either way. If you were to find a braking unit, it would work without any troubles with your controller since it simply monitors bus voltage and turns on the transistor to dump energy to the external resistors as needed during rapid decels. If there is some other feature, such as a spindle lock involved, I don't see how a new drive would solve that issue. The braking unit just allows for quicker stopping without faulting the drive in a dc bus overvoltage trip.

[FFAMN]

Mike,


Thank you for sharing your thoughts on adding a brake vs. new inverter. Another thought I had was to program INI seetings with G4 X[#]Y[#]Z[#]as a dwell setting with # being the number of seconds it takes for the spindle to come to a rest. According to the WinCNC manual the # seconds is unlimited. Thus if this idea works it will same some dollars realizing a job may take longer. However, I am in more need of dollars than time at this time. But I also recognize I am a novice user of CNC. What are your thoughts on this idea?

Again thank you.

Steve (FFAMN)

[Mike Nash]

I'm a newbie myself. I don't have a tool changer (other than my two hands), or a CNC router (yet) so my thoughts may be useless. However, if the time it takes for the spindle to stop is the only real issue, it makes sense that allowing more time in software should be an adequate solution as long as cycle time is not a major issue. (I do have a CNC'ed Harbor Freight Mini Mill however and am working on cnc'ing my IH Square column and have a start on a CNC router table )

[FFAMN]

Mike,

thank you for your thoughts. My son is trained in CNC and works as a mechanical engineer for my brother in law. He is the one that put the thought in mind head about using G codes to hold the machine while the spindle is winding down.

His thoughts are to add the G4 code in the Tool Changer Macro. I now to to get this Macro from the manufacturere or build it myself. If you are ever in need of learning how to run G codes there is a wealth of info available. The makers of WinCNC do a nice job. I am sure there are others.

Steve