| 摘要 |
PURPOSE:To simplify the module designing with an immediate detection of any coil disconnection in either of ON or OFF-state of the sequence by arranging an amplifier adapted to send a logic output detecting any coil disconnection when the sequence is at the ON-state, an amplifier adapted to send a logic output detecting it when it is at the OFF-state and a logic circuit for receiving the outputs of the amplifiers. CONSTITUTION:A differential amplifier A 6 is connected to a resistor 4 connected between the power source and an electromagnetic coil in an internal circuit of a coil disconnection detector 2 to measure a potential difference across it. A differential amplifier B 7 is connected to a resistor 5 between the sequence 1 and a coil 3 to measure a potential difference across it. A logic signal is outputted from the differential amplifier A 6 and the differential amplifier B 7 and inputted into a logic circuit 8. The logic circuit 8 produces an output when two inputs are both ''0'' (a low level signal) or ''1'' (a high level signal) as disconnection detection output. |
