JDI type Y-△ automatic conversion device power saving circuit

When the motor load current rises to the set value (for example, when it is less than 50% of the rated load current
), the motor is connected in a delta shape and runs. On the contrary, when the motor load is reduced to a certain value, the motor is connected in a Y-shape operation. Adjusting
the signal voltage division value (determined by Ri-R4) and the reference voltage value (determined by Ri., R14) can
stabilize the Y-△ conversion operating point at the required operating point.