| 摘要 |
A device with a safety circuit with an armature activated by a solenoid activates an electromagnet. The device has a switch connected in series to the solenoid, a device temporarily interrupting application of the voltage, first and second clock generators, first and second resistors, and a current detection switch. DC voltage is applied to the solenoid when the switch is closed. The voltage is interrupted when a predetermined current flowing through the solenoid is detected. The first clock generator actuates the switch during a predetermined first clock cycle. The detection switch detects current flowing through the solenoid. The first resistor, in conjunction with the response threshold of the current detection switch, determines the holding current for the armature. The second resistor generates an attraction current for the armature when activated by the second clock generator in a predetermined second clock cycle partially overlapping the first clock cycle.
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