VFD for drill press

[Boyan Silyavski]

Boyan,
It's a Siemens 420 (soon to be replaced with a 440) Inverter Drive with an Electro Adda 0.75kW 2 pole motor I'm not sure of the Hz it runs as I've programmed the VFD display to show RPM, I'll check the Hz at 7000rpm later today as I have an aluminium profiling job later today.
My experience so far is that these things tend to just work if you use decent quality gear, the availability of good, clear, English documentation makes programming the Siemens VFDs a 10 minute job.
I read a thread somewhere where Sir John Stevenson gave details of converting larger 3 phase motors to milling spindles with integral collet chuck and running them without issues at ridiculous speeds, 7000 rpm does what I need but I suspect I have left a substantial safety margin and that it could easily run faster,
Regards,
Nick

A bit off topic. Now i need your help here. I have the micromaster 420 on my belt grinder coupled with 3kw motor, and have it programmed 0-100 hz so i reach 0-3000rpm , its 4 pole 3 phase motor. The problem is where do i make to be able to change the frequency from the operating panel? i did it once, but forgot how. Read the manual 100 times, but still can not change frequency from panel up and down button, which drives me crazy.

[magicniner]

A bit off topic. Now i need your help here.

It's not in the operator's manual, it's in the Parameter List

You need
P0003 set to 2 so that all the parameters you might want to change are accessible to you
P0700 set to 1 for command input to be BOB (panel)
You might need to select the control frequency setpoint source and a few other odds & sods but the Parameter List is where you'll find the settings described -

http://www.acpd.co.uk/sei/s/1488/f123.pdf

Regards,
Nick

[magicniner]

At how many Hz you run it and hows that that it still works?

I've just finished a small run of parts and checked, 7000rpm is 117.6Hz