Re: axbb-e with Huanyang VFD
BTW, here is something that many have used as a guide and is a set up for disaster and has caused shorted outputs of the BOB etc, causing the relay to stay on.
The PDF shows a 20amp relay to operate a VFD ~20ma input!
But the significant error is there is no BEMF diode fitted across the relay coil.
When a relay such as this opens, there is a very large BEMF which can be in the order of several hundred volts.
The output device is usually either a mosfet or by-polar transistor, the rating of which is generally typically ~60vdc.
This can, and has, resulted in the shorting of the output device causing the relay to stay on.
Al.
CNC, Mechatronics Integration and Custom Machine Design
“Logic will get you from A to B. Imagination will take you everywhere.”
Albert E.