G120 3-Wire Control Without Macro

Hi All,

I am trying to setup 3-wire control on the CU terminals ... on a drive that is already setup ... so I do not really want to change the Macro setup.

I have a Stop Pushbutton and Start Forward Pushbutton.

I figure I need to allocate the Stop Pushbutton to P3330, and the Start Pushbutton to P3331

But I need to tell the drive to use 

Now as I said I do not really want to play with the Macro parameter p0015 ... so that means I should change p3334 = 3 ... but this is a Service Level parameter so I do not have access

Any ideas ?

hello,

attached block diagram to configure the digital inputs.

  With more information I may be able to help you better. 

Best regards. 

Hello,

maybe free function block RSR will help, start button connect to SET input, stop button to RESET input and RSR output to OFF1.

p20188.0 = p722.x (start button input)

p20188.1 = p722.x (stop button input) / p723.x (inverted stop input in case of NC contact)

p840 (OFF1) = r20189 (RSR0 output)

p20191 = 1 (add RSR0 block to runtime group 1 to activate it)

You didn't specify type of your G120 drive, hope your version has free function blocks..

With regards

Martin

Thank you both for the information and suggestions.

The real question I had was how to select 3 wire control, without using Macro ... and without knowing the service level password.

In the end to make to work I was forced to change the Macro. I still had one additional problem. The stop button we are using is connected directly to the PM240-2, and the start button to a digital input. In theory this will work one time only. The problem is that to start the drive again the ENABLE bit must first fall away. So to do this I used a Free Function Block ... NOT ... to invert the status of the STO safety input. And then connect this bit to P3330 which is the 3 wire control command 1 (the STOP).

All working now.