Welding SCR application

[improtec]

It is possible to use the PWM outputs to control the firing of the SCR in a Welding resistance spot machine?

[support]

Unfortunately it is not possible to use PWM to control the firing angle.

To properly control the firing angle you need a zero crossing detection and then compute the time lag until the SCR/TRIAC is fired.

The Fx2424 and Fx1616-BA and any SmartTILE-Fx based custom-made PLC support such built-in capability.

Please refer Chapter 18 (light Dimmer Control) of the Fx2424 User Manual for details.

You can download any user manuals from: http://www.triplc.com/documentations.htm

Thank you.

[improtec]

Unfortunately it is not possible to use PWM to control the firing angle.

To properly control the firing angle you need a zero crossing detection and then compute the time lag until the SCR/TRIAC is fired.

The Fx2424 and Fx1616-BA and any SmartTILE-Fx based custom-made PLC support such built-in capability.

Please refer Chapter 18 (light Dimmer Control) of the Fx2424 User Manual for details.

You can download any user manuals from: http://www.triplc.com/documentations.htm

Thank you.

The FXs have special functions to do it, using the interrupts input, It is possible to do it with the Nano? I mean using the interrupt input and do by programming Zero cross detection?

Thank you

[support]

Sorry that is not supported on Nano-10 or FMD.  The phase-cut is supported in firmware of Fx CPU but there is not enough resources on the Nano-10 and FMD PLCs to support this function.