| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a heater control method for a more flexible heater control system that can be configured easily, neatly, and effectively to meet a wide variety of operator requirements. <P>SOLUTION: The method includes: placing in an AC power circuit a high-limit switch which can turn on and off AC power to a heater; and controlling the high-limit switch by a high-limit control circuit which receives low-voltage DC power from a DC power supply. The high-limit control circuit is programmed as follows: when the temperature sensed by a temperature sensor placed adjacently to the heater exceeds a preset high-limit temperature, the high-limit switch turns off the AC power to the heater; when the low-voltage DC power to the high-limit control circuit is being stopped, the high-limit switch turns on the AC power to the heater, and then restarts the heater if the sensed temperature does not exceed the preset limit temperature. <P>COPYRIGHT: (C)2013,JPO&INPIT |
