| 摘要 |
PURPOSE:To lighten a position indicating lamp upon service interruption by a method wherein the lamp is lightened by a first rectifying device upon conducting current while a charging and discharging type DC power source is charged by a second rectifying device to discharge it upon service interruption. CONSTITUTION:The voltage of single-phase AC 100V is supplied to the terminals AC1, AC2 of the primary side winding of a transformer TR upon conducting a current. A position indicating lamp CPI1 is lightened by conducting a current through a first rectifying device Si1 - a DC output terminal P24A - a relay contact 1F - the position indicating lamp CPI1 - GD - the first rectifying device Si1. On the other hand, a power source B is charged by conducting a current through a second rectifying device Si2 - a resistor R - the power source B - the second rectifying device Si2. Upon service interruption, the output voltages of the output terminal P24A and the rectifying device Si2 become zero and the power source B is discharged. The position indicating lamp CPI1 is lightened by a current conducted through the route of the power source - a transistor D - the output voltage terminal P24B - the relay contact 1F - the position indicating lamp CPI1 - GD - the power source B upon service interruption. |
