Control Specification SiUS091601E41 Functions and Control3.2 Frequency ControlOutline The compressor frequency is determined according to the difference between the room thermistortemperature and the target temperature.Detail 1. Determine command frequencyCommand frequency is determined in the following order of priority.1. Limiting defrost control time2. Forced cooling3. Indoor frequency command2. Determine upper limit frequencyThe minimum value is set as an upper limit frequency among the frequency upper limits of thefollowing functions:Compressor protection, input current, discharge pipe temperature, heating peak-cut, freeze-upprotection, defrost control.3. Determine lower limit frequencyThe maximum value is set as an lower limit frequency among the frequency lower limits of thefollowing functions:Four way valve operation compensation, draft prevention, pressure difference upkeep.4. Determine prohibited frequencyThere is a certain prohibited frequency such as a power supply frequency.Command frequency Limit frequency Skip controlLower limit functionFour way valve operation compensation, etc.Initial frequencyPI controlDefrost controlDropping functionInput current control, etc.Upper limit functionCompressor protection functionUpper limit frequencyFMAXLower limit frequencyFMINTarget frequency(R18023)When the shift of the frequency is less than zero (∆F<0) by PI control,the target frequency is used as the command frequency.
