| 摘要 |
<p>PURPOSE:To discriminate quickly and easily a fan which becomes faulty, by detecting fan alarm signals of plural cooling fans and operating alarm cutting switches successively one by one when the alarm signal is generated. CONSTITUTION:Cooling fans F1-F5 are arranged individually in cooling units 2a-2e, and fan alarm generating parts 1a-1e are provided for fans F1-F5. Fan alarm generating parts 1a-1e are connected to an alarm detecting part 4 through switches S1-S5, and the output is supplied to an alarm part B and controls so that a power supply units 6 is cut off through a power supply control part 5. If any fan generates the alarm signal, the alarm part B is operated because all switches S1-S5 are closed in the initial state, and switches S1-S5 are turned off successively one by one, and the faulty fan is discriminated by extinguishment of alarm.</p> |
