Thread: VFD Circuit Diagram Question

Stuart et al.
I bought my $50 one from a TaoBao seller directly. Very tricky business. I wouldn't recommend it to less than VERY patient people - unless you can read and write Chinese (Han).
However, if you search on Alibabexpress.com and you have an account there, you turn up many interesting things, e.g.:
http://www.aliexpress.com/item/Simpl...590257750.html same as what I got,
http://www.aliexpress.com/item/VFD-f...652037921.html or even
http://www.aliexpress.com/item/Taian...605956419.html

Just because what you are looking for isn't there today doesn't mean it won't be tomorrow.....

Originally Posted by jhovel

Stuart et al.
I bought my $50 one from a TaoBao seller directly. Very tricky business. I wouldn't recommend it to less than VERY patient people - unless you can read and write Chinese (Han).
However, if you search on Alibabexpress.com and you have an account there, you turn up many interesting things, e.g.:
http://www.aliexpress.com/item/Simpl...590257750.html same as what I got,
http://www.aliexpress.com/item/VFD-f...652037921.html or even
http://www.aliexpress.com/item/Taian...605956419.html

Just because what you are looking for isn't there today doesn't mean it won't be tomorrow.....

Hi Joe,

Might not be related, but I got a credit card cleaned out after some aliexpress purchases, use caution.. incidentally the bank refunded the money from the fraudulent transactions with no fuss at all..

Ray

Thanks Ray. Yes, I tend to be pretty cautious - with my credit card detail in particular. I haven't paid by card on Alibaba or TaoBao ever.

This morning I played with having a separate E Stop command. I got it to work. A number of hints have been made such as a NO switch.

Here is my circuit. I think it covers everything. I now have a Stop switch with ramp down and an E Stop switch with coasting stop. As Ueee mentioned, I need a coasting stop for the brake pedal. I had a look this morning and found the change gear door cutout switch was connected NO. I have not looked further yet.

VFD Remote Control Circuit Diagram.jpg

Dean

Originally Posted by Oldneweng

This morning I played with having a separate E Stop command. I got it to work. A number of hints have been made such as a NO switch.

Here is my circuit. I think it covers everything. I now have a Stop switch with ramp down and an E Stop switch with coasting stop. As Ueee mentioned, I need a coasting stop for the brake pedal. I had a look this morning and found the change gear door cutout switch was connected NO. I have not looked further yet.

VFD Remote Control Circuit Diagram.jpg

Dean

E-stops should always be NC, to ensure that a broken cable (or a loose connector or a bad crimp etc) result in the e-stop being activated. This forces the user to investigate and fix the fault before using the machine.

With an NO e-stop, you could be working for years with a non operational e-stop and NOT knowing it. The day you need the e-stop because the chuck is winding-in your tie, it is too late to find out it is broken.

Originally Posted by cba_melbourne

With an NO e-stop, you could be working for years with a non operational e-stop and NOT knowing it. The day you need the e-stop because the chuck is winding-in your tie, it is too late to find out it is broken.

This is the reason I dont use the E/stop circuits. Its also why my "normal off"(foot pedal brake) is the E/stop(as such) as thats the one I'll going to go for when it hits the fan.

Joe....I havent given it a lot of thought but re your braking stop/ coasting stop issues. How about swapping the e/stop and normal stop. E/stop(NO) normal operation with coasting stop. Normal stop (NC) for emg stop with braking? As I said I've given 0 thought to how you'd go wiring this up as I dont know how to "reset" the VSD after E/stop. Though I'd still be using the normal stop(which is the e/stop in this case) for normal operations for the above reason.

As for brakes. The rotor for my lathe brake is just bolted to the motor pulley, you dont need much of a brake really(depending on the size of the machine of course).

Stuart

Originally Posted by cba_melbourne

E-stops should always be NC, to ensure that a broken cable (or a loose connector or a bad crimp etc) result in the e-stop being activated. This forces the user to investigate and fix the fault before using the machine.

With an NO e-stop, you could be working for years with a non operational e-stop and NOT knowing it. The day you need the e-stop because the chuck is winding-in your tie, it is too late to find out it is broken.

Agreed, but it has been discussed already in Joe's thread. That is the way SPL is set up on these VFD's. I have the momentary brake pedal cutout switch connected to E/Stop and has been mentioned, this is probably the one that will be used for nearly all stops which will provide constant testing. There is still the problem with the tie wrapping itself around the chuck when the wiring has just failed, but I don't even possess a tie so I don't see much risk there.

Stuart

This is the reason I dont use the E/stop circuits. Its also why my "normal off"(foot pedal brake) is the E/stop(as such) as thats the one I'll going to go for when it hits the fan.

How does this "NO" work any different to my "NO" E Stop switch?

Joe....I havent given it a lot of thought but re your braking stop/ coasting stop issues. How about swapping the e/stop and normal stop. E/stop(NO) normal operation with coasting stop. Normal stop (NC) for emg stop with braking? As I said I've given 0 thought to how you'd go wiring this up as I dont know how to "reset" the VSD after E/stop. Though I'd still be using the normal stop(which is the e/stop in this case) for normal operations for the above reason.

That is an idea worth trying. There is no need to reset the VFD after E/Stop. It resets itself as soon as the switch status returns to normal and the VFD frequency drops to zero. I have just tested this. Releasing the momentary E/Stop switch immediately does not cause the motor to start again.

As for brakes. The rotor for my lathe brake is just bolted to the motor pulley, you dont need much of a brake really(depending on the size of the machine of course).

My lathe is the same. Even at 100Hz it requires surprisingly little effort to stop the chuck.

Dean

Originally Posted by Oldneweng

How does this "NO" work any different to my "NO" E Stop switch

I think my poorly worded post has confused you. I'll try again.
I dont use any NO circuits.
The foot brake is the way I turn the lathe off "almost" all the time, even though I could use either E/stop button or the lever.

Stuart

This is a very informative discussion. Just for the record, resetting the VFD after any error is just a matter of pushing the Stop button on the touch panel. It stays active even when all other controls are external. Although there is a parameter to disable that too....

Cheers,
Joe

I will see whats involved in changing my mill panel to separate the 'normal' stop from the E-stop. Apart from an extra wire.... which I don't have....

Cheers,
Joe

Dean et al.
So this should work for me? Haven't tried it yet...

VFD Remote Control Circuit Diagram2.jpg
Edit: I've got myself confused too!
Now corrected button assignmets and labled their use.
PDs remain and were correct.
Note there is no button associated with PD46/Rst/D3

Hi Joe,
So the NC switch it your E/stop?

After you do a "normal stop"(closing Spl)*. Dont you then need to open Rst before you can restart? Would be painful to have to press the E/stop(DCM NC) button to reset the VSD before closing For or Rev to restart.

Stuart

*damn this is confusing when you are using E/stop and normal and normal as E/stop lol

Originally Posted by Stustoys

I think my poorly worded post has confused you. I'll try again.
I dont use any NO circuits.
The foot brake is the way I turn the lathe off "almost" all the time, even though I could use either E/stop button or the lever.

Stuart

What I wanted to know is what this E/Stop switch does to cut the power. If you don't have E/Stop circuits that implies to me that you don't use the VFD E/Stop function. Maybe I have that wrong.

Dean

Originally Posted by Oldneweng

What I wanted to know is what this E/Stop switch does to cut the power. If you don't have E/Stop circuits that implies to me that you don't use the VFD E/Stop function. Maybe I have that wrong.

Hi Dean,

Thats right. I dont use the NO E/stop function on the VSD. The e/stop button is just another stop button.

There maybe a little confusion. My lathe doesnt have a VSD(I was just talking about the brake and e/stop set-up). My Mill has VSD, as far as the VSD goes there is no difference between the mills stop button and E/stop button.

Stuart

Originally Posted by jhovel

Dean et al.
So this should work for me? Haven't tried it yet...
Attachment 313986

This is how mine would look with the addition of the jog functions.

VFD Remote Control Circuit Diagram.jpg

Note the correction for Jog REV.

I appears to me that Pd046 should be set to 13 and Pd049 set to 04.

I am not up to date on the ramp up and down aspects yet, but as DCM is set to ramp down via another setting as I read it, it would need to be set so there was no ramp down at all so the brake is not fighting with the motor, as Ueee mentioned.

I have no idea whether a ramp down value can be applied to SPL. If not it means that both stops will have no ramp down, so you may as well use DCM for all stops and set ramp down to zero. I could easily be wrong. Just my understanding at this point.

Joe are you planning on using a latching switch on DCM?

Hi Joe,
So the NC switch it your E/stop?

After you do a "normal stop"(closing Spl)*. Dont you then need to open Rst before you can restart? Would be painful to have to press the E/stop(DCM NC) button to reset the VSD before closing For or Rev to restart.

Stuart

Joe's SPL stop switch is momentary. It would be released as soon as you take your finger off the button. The VFD will then automatically reset when it reaches zero Hz. Remember I deliberately tested this action this afternoon.


Dean