Method for actuating a fan using a plurality of...

Details Method for actuating a fan using a plurality of... Method for actuating a fan using a plurality of...

2007-12-25

2007-12-25

Norman, Marc (Department: 3744)

Refrigeration

Automatic control

Of external fluid or means

C062S158000, C062S186000, C123S041110, C123S041650, C416S039000, C415S047000

Reexamination Certificate

active

10966103

ABSTRACT:
The present invention relates to control of a fan during which the power of the fan is determined from the characteristic curves of the fan motor, the operating parameters of the cooling system and the reference variables which are predefined in the form of temperature levels. The various temperature levels which are to be set have different associated characteristic curves for actuating the fan motor. If the reference variable for the control changes, this also means a change in the characteristic curves for actuating the fan motor. In order to prevent the fan motor from whining, the operation of the fan motor is kept constant for a settable minimum waiting time when the reference variable for the control of the fan changes. During this minimum waiting time, the operating parameters of the cooling system can, if appropriate, be adapted by means of other control mechanisms which are independent of the fan to the new reference variable to such an extent that it is no longer necessary to take measures with respect to the whining of the fan motor.

REFERENCES:
patent: 4806832 (1989-02-01), Muller
patent: 6101987 (2000-08-01), Saur et al.
patent: 6291956 (2001-09-01), Ku
patent: 197 28 814 (1999-01-01), None

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