| 摘要 |
<P>PROBLEM TO BE SOLVED: To use a cubicle of an electric drive type working machine, which is designed to be used in 1,000 meter or lower in height, and is used at a high altitude of 1,000 meter or higher. Ž<P>SOLUTION: When an indication signal SD2 for supplying a motor driving power source to a cubicle 19 is received from an indication means 21 under the condition that an atmosphere pressure in the cubicle 15 detected by an atmospheric pressure sensor 18 does not reach to a prescribed threshold value, a control means 19 supplies a pressurized air into the cubicle 15 from an electric compressor 16 to increase the atmospheric pressure in the cubicle 15 before starting to supply a motor driving power source to the cubicle 15 and starts to supply the motor driving power source to the cubicle 15 only after the atmospheric pressure in the cubicle 15 reaches to the threshold value. Thus, it is possible to increase a withstand voltage performance at a high altitude by using a cubicle which rated voltage is low. It is also possible to use a switch which can detect on/off of a relief valve instead of a pressure sensor. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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