Almost at the final hurdle and after finally sorting out the connections and getting my spindle turning correctly ..... the old spindle drive inverter/controller has given up in a puff of smoke, well it was nearly 30yrs old!!. Not yet sure how much damage has been done and whether it can be repaired, as I will get it checked out. But if it is damaged beyond repair, can anyone else recommend a suitable single to 3 phase inverter/controller?

My motor spec is as follows -

MAKE - ASEA
3Phase - 50hz IEC34 IP54
MT71B-F85-4 Class F
0.37Kw 380/380-420VY 1.3A
1400r/min 220/220-240V 2.3A
No.1470779 CoS 0.69

I have been recommended this one -

http://www.ebay.co.uk/itm/0-37kw-1-2HP-Single-Phase-In-Three-Phase-Out-Motor-Inverter-AC-Drive-NEW-/221180218416?pt=UK_BOI_Industrial_Automation_Control_ET&hash=item337f5e4c30

It does state -

Control Specification
Control Method
Voltage Vector
Energy Optimised
PWM Frequency 4…32 kHz (effective)
V / Hz Ratio Linear
Boost Yes
Stop Mode Coast / Ramp / DC Brake

Am I right to think that mach3 can control this via a pwm 5khz signal? via my diycnc sp4dc board

Any help will be very much appreciated

the diycnc board gives you 0-10v output to run the inverter, and is run from the step and direction signal from mach.

when you setup the inverter you will need to set the max frequency to 100hz

Phone these or look at the site they are excellent and a good price. http://www.inverterdrive.com

gavin oseman is also keen on price. 01684574996

I use a GS2 series drive from Automation Direct.  It is single phase in 3 phase out.  I control it via the digital inputs for manual FWD/Stop/REV and a speed pot from the control pendant switches or control FWD/Stop/REV and/or the speed from Mach via modbus.  Modbus makes for a clean install and if your not going to need to be able to swap around form auto to manual control it is pretty straight forward to set up.

Brett

Blown capacitors, resistors and power transistors...... it's ruined,

Angel tech, what is the relevance of setting up the inverter frequency to 100hz, when the motor is only 50hz?

to get double the speed

your motor will probably run at 1425 rpm at 50hz, so if you set the inverter to run at 100hz max frequency you'll get approximately 2850 rpm at the motor.

Ah ok, yeah as before the max rpm was 2500 when programmed through the original control, even though motor states 1400 rpm.

If I wire in a potentiometer to the new drive, is it correct that, that will make mach3 redundant for spindle control?

yes, but why would you ?