Variable frequency drive for high speed spindle
Variable frequency drive for high speed spindle
(OP)
I operate a CNC router table with a high speed spindle. I'm looking to upgrade to a new spindle but need to know if the variable frequency drive I currently have will work with this new spindle.
The new spindle has the following stats: 300Hz, 1kw, 18000RPM.
The frequency drive is made by LS Industrial Systems - Starvert SV008IC5-1F
The info on their website suggests that this particular drive can reach 400HZ, but I'm not sure about the other details, especially whether or not 1kw is too high.
More info is available using this link:
http://e ng.lsis.bi z/product/ product/in troduce/ec atalog_vie wStream.as p?catalog_ id=288& ;fileNum=1
Any advice would be welcome.
The new spindle has the following stats: 300Hz, 1kw, 18000RPM.
The frequency drive is made by LS Industrial Systems - Starvert SV008IC5-1F
The info on their website suggests that this particular drive can reach 400HZ, but I'm not sure about the other details, especially whether or not 1kw is too high.
More info is available using this link:
http://e
Any advice would be welcome.






RE: Variable frequency drive for high speed spindle
If you don't actually push your spindle to the limits constantly it may work okay for you. You can overload them for a bit. If a particular pattern only overloads it in an occasional move it could work. You want to do everything you can to keep the drive cool.
Alternatively 1kW drives are pretty inexpensive($200~350) and you might just want to upgrade your drive.
I've been doing acrylics, PVC, ABS, and aluminum lately. What do you route?
Keith Cress
kcress - http://www.flaminsystems.com
RE: Variable frequency drive for high speed spindle
RE: Variable frequency drive for high speed spindle
The motor rating shown in the PDF manual is the rating for a typical motor that would be controled by the variable frequency drive (VFD). In order to avoid overloading the VFD, you must also not exceed the VFD's full load current rating (FLA), 5 amps. It is possible that you could operate a 1kW motor without exceeding the 1.8 kVA, 5 amp output rating. That might still overload the input section of the VFD, but if there is no warning against using a motor larger than .75 kW, I would go by the output kVA and FLA ratings rather than the motor kW rating.
The motor voltage rating must also match the output rating of the VFD. The PDF manual has a major unfortunate error in listing the output voltage as "Single phase, 200 to 230V." The output is actually 3-phase and the voltage would range, inproportion to output frequency, from zero to the connected input voltage, 200 to 230 V. The motor voltage should match the available input voltage supply.
RE: Variable frequency drive for high speed spindle
I am extremely surprised to learn how much a pain it is just by getting a slightly more powerful spindle. I mean it doesn't half sound complicated. How easy is it to change the settings on these drives? I've looked at the operating manual for the Starvert drive and it goes on for ever. As someone who has very little knowledge of the electrics on a CNC table, who would be best person to get in to sort this out?
RE: Variable frequency drive for high speed spindle
A motor that is rated 0.7kW is capable of delivering 0.75kW of mechanical power to the load. The maximum input electrical kW from the VFD to the motor will be determined by the motor efficiency. The maximum motor current is determined by the kW, voltage, efficiency and power factor. However, the rated current should be marked on the nameplate and listed in the catalog. That is what you need to check.
On some VFD brands it is not too difficult to change settings. Some have a quick setup guide that covers the items that are most likely to need changing. Some brands are more difficult. Anyone who has ever changed settings on any brand would probably be of some help. I have gone through the manuals and changed settings on 20 or 30 different VFD models. I will see if I can help by posting here. Do you have complete nameplate data for the motor? Have you actually purchased the new spindle?
RE: Variable frequency drive for high speed spindle
Keith Cress
kcress - http://www.flaminsystems.com