Just blown up my inverter

**Boyan Silyavski** · 30-12-2017

Forget about that spindle displaying RPM. Why would you need that?

You will need only to fine tune the input voltage and the voltage adjustment in the VFD , so your spindle to run correctly at 3000, 6000, 10000, 12000, 16000, 18000, 24000 rpm, Once you have done that more or less, as its always a compromise, then you are done. When all is controlled from software and runs well, why would you need spindle to display RPM?

I was like you at the start, but in reality it could be 3 years before you look at the VFD if all is running as expected...

**EddyCurrent** · 30-12-2017

Boyan, I have to disagree to an extent.
If the facility to display RPM is there and it's easy to achieve then why not use it ? I use the RPM display every time on my machine.
Most inverter related problems on the forum are due to untrained people trying to use them.

**cropwell** · 30-12-2017

A lot of problems on the forum are RTFM.

**Boyan Silyavski** · 31-12-2017

Originally Posted by cropwell

A lot of problems on the forum are RTFM.

Do you know how bad is to be a perfectionist and not understand anything from VFD manual?

I remember first time reading VFD manual , something like 300 pages. My brain burned trying to understand what they are talking about and especially not to make a costly mistake and some magic smoke.

**cropwell** · 31-12-2017

Originally Posted by Boyan Silyavski

Do you know how bad is to be a perfectionist and not understand anything from VFD manual?

I wouldn't know that, I am not a perfectionist. If you want to know how it is to not understand anything from a manual try Macro Level CICS from IBM.

**Nr1madman** · 31-12-2017

Originally Posted by Boyan Silyavski

... My brain burned trying to understand...

Hahaha!
I know what you are talking about!
This is a constant for me when reading chinglish ;)

Skickat från min SM-G955F via Tapatalk

**Desertboy** · 31-12-2017

Chinglish is great, my linked in is mostly Chinese contacts and everyone is called Kate or Bob lol ;)

**Neale** · 31-12-2017

I managed to understand enough of the manual that I was able to correct the initial programming of my HY inverter so that it showed the correct speed. As delivered, it worked fine but the speed readout was half what it should have been (based on the frequency display). Eventually I changed the "motor poles" setting which seems to have absolutely no effect on motor or speed but does correct the internal frequency-to-speed calculation so that the display is correct.

I used to use the display all the time on my Mk1 router which used manual inverter control, but since I installed it on the Mk2 with Mach3 control I barely look at it. I glance occasionally, but only when I'm wondering what the error between Mach3 and the actual speed is. Generally it runs a few per cent faster than commanded, but given that there is a digital-to-analogue and analogue-to-digital conversion going on there, that's not at all bad. And if a few per cent faster is the difference between something working and something not working, then I'm too near the limit anyway

**EddyCurrent** · 31-12-2017

Neale, provided the vfd does not use a sensorless vector control algorithm I think you are correct in assuming that motor poles will affect the speed reading only.
Also we are still waiting for feedback from Lodds about his new parameter settings.

**Boyan Silyavski** · 31-12-2017

In reality i will be more interested to see tha Amps in real time, not the Revs. but anyway i barely ever look at it. Only if something does not sound right i check with a glance the speed.