Is it necessary to purchase the DC2DC-12V Module for the UB1 board in order to pass a PWM signal to the VFD??
Is it necessary to purchase the DC2DC-12V Module for the UB1 board in order to pass a PWM signal to the VFD??
Most VFD's don't accept a PWM signal.
The UB1 converts the PWM to a 0-10V analog signal, and requires a 10-12V DC voltage. You can usually get the 10V from the VFD. However, there's a slight voltage loss in the PWM >0-10V circuit, so to get a full 0-10V range, you need a 12V supply. If you can't get 12V from your VFD, then yes, you need the 12V supply in order to get your 0-10V speed control output.
Gerry
UCCNC 2017 Screenset
http://www.thecncwoodworker.com/2017.html
Mach3 2010 Screenset
http://www.thecncwoodworker.com/2010.html
JointCAM - CNC Dovetails & Box Joints
http://www.g-forcecnc.com/jointcam.html
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)
Thanks Gerry!