Huanyang VFD help please

Good Evening, can someone help please ?

I have my mill, which has been overhauled , has run happily with its new motor on the VFD, starting and stopping via the VFD control panel. When the mill was built back in the 1960's it had a 2 speed motor operated via a switch with high low and off ... I would like to use this switch to control the VFD , possibly to run the motor at 2 different frequency settings so high is 50Hz and low is 25HZ can anyone help please thank you

Edited By Jerry Bland 1 on 08/11/2020 19:53:14

Edited By Jerry Bland 1 on 08/11/2020 20:33:15

A resistor in series with the switch would do this, but is quite limiting compared to a potmeter.

Donyou have the instructions. They will tell you which menu settings and which terminals. The settings will be different for momentry buttons vs switches. Ive done it recently. I assume it differs by model. Mine was a cheap AT1 (£60).

I have to ask why? A conventional pot would give a much more useful variable speed rather two fixed.

The pot is easier to set up

By all means, the motor should run on either speed from the VFD. However any change-over switch should not be operated while the VFD is energising the motor. Switching between VFD and the motor may damage the VFD in those circumstances (read the manual?).

You would clearly get more power, at any given lower speed, while running on the lower speed windings. That is a clear advantage.  That is with all the programmable settings (apart from overload current settings and perhaps one or two others) still being available.

Edited By not done it yet on 09/11/2020 08:32:05

Hello Jerry, to set up the VFD for two speed operation set PD080 to 2 (multispeed operation) that will bring the multispeed terminals into operation. The speed is then selected by terminals 5 and 6, you only need to use terminal 5 for two speed operation. If you connect it to common the drive speed will be set by PD086, with no connection to common the speed will be set by PD003.

Michael

Michael thank you so much And everyone else.

I have ended with a similar way before seeing your instructions ,but to get an 'off' needed to bring the 'forward' terminal into play, along with the @common' 'SPH' and 'SPL' terminals so in 'off' there is no feed to either of the speed terminals or forward terminal. in high there is feed to forward and to to SPH . Likewise in low there is again a feed to forward , and then to SPL .

So the VFD in either speed gets told to run and what frequency... And it works .

What do you think Regards Jerry

With the help from Michael seems to be a positive outcome.

Emgee

You could have a pot. wired on each switch position to give a quick change to a known different speed.

I have my milling machine setup like this, a three position switch with a pot. on each switch. I can setup it up for when I am drilling / tapping a lot of holes, one position is drilling speed, another is another drilling speed, the last is tapping speed.

Hello Jerry, the speed selection sets the internal frequency reference for the drive, it does not make the drive run. To make the drive run you energise the forward terminal and de-energise it to stop it. You shouldn't need to change the feed to SPH or SPL to stop it. I don't have a Huanyang drive to verify that, I'm just going off the drive manual. Happy that you have a working solution, Michael.