Emcoturn 120 lathe retrofit

I removed the fwd/rev wires to concentrate on running. I set the VFD to accept 5v signal for speed and was able to start and run the VFD in the forward direction from linuxcnc. got the top speed working and all was good. Then I used parameters from the VFD vendor to get the braking working. First run it kinda shuddered below 10hz, then was smooth, took it to full speed about 105hz and then hit stop. it braked to a stop in about 2 seconds, pretty impressive, until I tried to start it up again. now it just flashes and clicks and wont start..... I sent the VFD vendor an email last night. lets see what happens but I am not optomistic

the seller asked me to take a video so they could see the issue themselves. I turned on the main breaker and set the vfd for 30HZ so I could get a video. hit the start button big loud POP and a cloud of white smoke. Unfortunately I did not have videos running. I emailed the results of their request back to them....

On another note, does anyone know of a VFD that will run a 5hp and has 1ph input. Seems like all the major makers want 3ph for 5hp.

There are literally dozens. You might not want to buy from these boys but here are some examples .

It's arguably worth buying a good quality brand. I tend to favour Japanese myself for process controls or possibly even German.

No eBay APP ID and/or Cert ID defined in Kunena configuration[quote="LutzTD" post=77894On another note, does anyone know of a VFD that will run a 5hp and has 1ph input. Seems like all the major makers want 3ph for 5hp.[/quote]



(As an example)

There is some text in there saying that it is 380V, but I think that's a copy and paste error. It also says that the VFD can take 3 or 1 phase input.
Actually, most VFDs can run on single phase, the first stage of them all is just a rectifier, so unless the VFD had phase-loss detection they work OK on single phase. Ripple will be higher on the DC bus, and the rectifier diodes will be working slightly harder, but a lathe won't be running at full load very often or for very long.

rectified 240 V comes out to 340 V DC with a capacitor-input filter.

One way to allow a VFD to run reliably from single-phase power is to use a VFD rated for a larger motor. For instance, for a 5 HP motor, get a 7.5 or 10 HP VFD. This insures extra capacity on the rectifiers and filter capacitors.

However, a VFD that blows up immediately on single phase power has something major wrong with it. The extra rectifier current and ripple will shorten the life of the rectifier and capacitors, but not such that it blows within seconds.

Jon

looks like the one I bought is shown as "beware the cheap copy" in the link you gave...... Ill see if they will at least give something back....