| 摘要 |
PROBLEM TO BE SOLVED: To surely judge whether power is not actually supplied, or a state display ELD is abnormal in the non-lighting of the LED by a trouble such as disconnection or the like. SOLUTION: This power supply display device for power source comprises a switch 1 for connecting a power source 8 to a drive unit 7 and a relay 2 (contact 2a) for connecting the power source 8 to a load 7 after the input of the switch 1, which are serially connected, respectively; an LED 5 connected in parallel to the load 7 to display that a power is supplied to the load 7 by the operation of the relay 2; a first resistor 4 connected serially to the LED 5 and having the other end connected to the load side of the relay to control the current carried to the LED 5; a first diode 3 connected in reverse parallel to the LED 5; and an impedance (diode 10) connected among the anode of the LED 5, the power source side of the relay 2 and the switch 1, so that the LED 5 emits a faint light when the switch 1 is inputted.
|
