Thread: Another Newbie VFD question

Where do you put an emergency Stop switch, do you put it in the 240v supply line to the VFD or between the VFD and Motor.

Cheers Shane.

All the discussions I have had and read say to use the VFD E Stop. That is how mine is connected. I think, from memory there is an option for connecting as Normally Closed. The connections for these controls are all arbitarily set in the VFD. You can reasign any of them for what you want by changing the parameters.

Dean

Thanks Dean.

You trying to start a fight?

I think its fair to say opinions vary on that one.
My opinion varies from machine to machine.

I wouldn't put an E/stop in either position. If you feel the need for an isolation switch then by all means use one in each position, though it wont do the VSD any good to use either(though how much harm it does is also open to debate)
I am of the opinion the E/stops should be used in normal operation(on most machines we are dealing with). Thats the button/lever/pedal your going to go for when it hits the fan.

I wouldn't personally use the VSDs E/stop circuit as is NO(normally open)

Are you talking about fitting one to your HM-45?

Stuart

Hi Dean,

I think you're wrong re E/stop on at least my Huanyang and Teco VSDs. There are NC circuits that can be used, but they aren't the VSDs E/stop setting. PD044-049=13

If I'm wrong can you post the parameters please.

Stuart

p.s. I should add I agree with Dean the VSD should be used for e/stop.......... just not the VSD's e/stop function(unless he can make it work NC)

Yes to my RF-45.

You are right Stuart. I did not have ready access to a manual and I gave up trying to get on the forum. Net congestion.

The connection I was thinking about is DCM(COM). Wire the NC EStop into this and an ordinary stop, if required into RST. This is a NO switch.

The connections associated with codes 44 to 49 can be assigned as needed and the code set to do whatever you want this connection to do, except make a cup of tea.

I have been looking for the revised manual that Joe posted somewhere or linked to, but no success yet.

I have also been trying to find my threads about setting up the VFD (not that I want a reminder) but poor access to the forum has made this hopeless. This post may not post until tonight for all I know.

Dean

The discussion about e-stops and emergency braking option can be found here:
External Panel Option for HuanYang VFD - Page 4
For connections and parameters (for Huanyang VFDs) use the last diagram in the thread (there is a small error: where is says PD0 4=PD016, that is meant to be PD014=PD016).
Disconnecting the power to the VFD or the motor is NOT an e-stop. The motor will coast to a stop! If you have some inertia in your milling machine drive, that could take too long in an emergency - like a sleeve caught in a cutter....

I agree cutting the mains to the VFD is not an E-stop but whether the motor coast to a stop or not may be VFD dependent?
The HYs I have tested do let the motor coast but the SAJ seems to stop the motor in the same time as a usual stop.
Still not an E-stop but better than coasting.

OK Bob, great, I'm always learning something new here!
I have a Telemecanique, a Eurodrive, a Siemens, a Heng Tai, a Yandong, a Bonfiglioli and several Huanyangs -all of them coast if the power is cut. Clearly some have enough oomph left in the capacitors to drop their output frequency for long enough to stop the motor after they get no input. Good to know for some applications.