25080 SCR Motor Control

VFD’s can detect faults in many areas:

incoming power, control inputs, DC bus, and the motor itself

Silicon Controlled Rectifier (SCR)

Electronic switching device used for many applications, including motor speed control. SCR’s are used to convert (rectify) AC into DC voltage.

SCR construction:

Much like a diode, an SCR has an anode and cathode, however it also has an component called a gate,

When the Gate voltage goes positive with respect to the cathode, the gate is:

Triggered

Rectifier

Allows current to flow in one direction and blocks it in the other.

The output of an SCR speed control circuit is:

Pulsating DC

Speed control is accomplished with an SCR by varying the  ____ ____ of the SCR

firing angle

scr speed controller types:

half and full wave rectification