G/day fella's, I have fitted a cheap VFD to my lathe, one of these https://www.ebay.com.au/itm/SKI780-5...72.m2749.l2649
The VFD is tiny and fits nicely in the electrical box on the back of the lathe.
It is 415 - 415 volt and 7.5 HP, the Digital inputs on the front of the VFD are switched by the forward and reverse contact relays that are no longer used to switch the motor, so the lathe Forward/Reverse lever, jog button and safety switches still work as they would normally and originally intended.
I fitted a cooling fan to the cabinet and this is also switched on by the old 3 phase motor contractors when the motor is running in forward or reverse, also fitted a temp controller for the fan with the sensor situated at the heatsink air outlet of the VFD.
It really is a good addition, soft start, jog button can be used now when changing gears, has any speed I want between gear ratios..... I could go on, it is fantastic........
BUT......can anyone tell me how to get the damned brake resistor to work?
I emailed the seller, ha, I didn't really expect much there but I thought he might be able to put me in contact with someone, and I have emailed the manufacturer in English and google translated Chinese, no reply...
I have fitted a 1000w 75ohm braking resistor, this is the one https://www.ebay.com.au/itm/Aluminiu...72.m2749.l2649
I have tried different program settings hoping that I would fluke getting the brake working but no joy, the brake resistor measures close enough to 75 ohms, but I have no DC power at the brake terminals when the motor is stopping.
This manual is for the smaller kw same model VFD's and the manual is the same as the paper manual that I have. http://www.sakohz.com/download/20190124124714147.pdf
The relevant pages that I can see are pages 30, 31 and maybe 39.
Any advice on this would be greatly appreciated.
cheers, shed