Scr Motor Diagram 90° Phase Control of SCR. In ac circuits, the SCR can be turned on by the gate at any angle a with respect to the applied voltage. This angle α is called the firing angle. Power control is obtained by varying the firing angle and this is known as phase control. In the phase-control circuit given in fig. 1, the gate triggering voltage is derived from the ac supply through resistors R1, R2 and R3.
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Scr Motor Diagram The basic characteristics of the SCR can be understood with the aid of these diagrams, as follows: When power is first applied to the SCR by closing S1 in Figure 2, the SCR is 'blocked' and acts (between anode and cathode) like an open switch.
Scr Motor Diagram Wiring Diagram Book A1 15 B1 B2 16 18 B3 A2 B1 B3 15 Supply voltage 16 18 L M H 2 Levels B2 L1 F U 1 460 V F U 2 MOTOR 3CT TO 120 V SEPARATE CONTROL * OT is a switch that opens Triac SCR PUT NPN Transistor B C E PNP Transistor B C E UJT, N Base E B2 B1 UJT, P Base E B2 B1 Gate Turn-Of