Internet PLC Forum
General => Technical support => Topic started by: improtec on May 12, 2017, 02:16:02 PM
-
It is possible to use the PWM outputs to control the firing of the SCR in a Welding resistance spot machine?
-
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.
-
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
-
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.