| 摘要 |
PROBLEM TO BE SOLVED: To prevent a temporary overcooling state of a cooling apparatus such as a showcase when the load is light like in winter.SOLUTION: A cooling apparatus wherein a motor of a compressor 1a is operated with an inverter 4 includes a control unit 3 which calculates a rotational speed command of a motor so that the blowoff temperature of an evaporator 1d may coincide with a target temperature, the control unit 3 imparting the rotational speed command to the inverter 4 for controlling the rotational speed of the motor. The control unit 3 performs a speed fixed control for fixing the rotational speed of the motor at the start of cooling to the extent that the blowoff temperature is not overcooled, and then, calculates the rotational speed command so that the blowoff temperature may coincide with the target temperature and starts rotational speed control. Thereby, the cooling apparatus is prevented from being over cooled at the start of cooling when the load is light like winter. |
