Control Specification SiBE041029EB31 Function and Control3.2 Frequency ControlOutline The compressor frequency is determined according to the difference between the roomthermistor temperature and the target temperature.Detail 1. Determine command frequency Command frequency is determined in the following order of priority.1. Limiting defrost control time2. Forced cooling3. Indoor frequency command2. Determine upper limit frequency The minimum value is set as an upper limit frequency among the frequency upper limits ofthe following functions:Compressor protection, input current, discharge pipe temperature, heating peak-cut, freeze-up protection, defrost.3. Determine lower limit frequency The maximum value is set as a lower limit frequency among the frequency lower limits of thefollowing functions:Four way valve operation compensation, draft prevention, pressure difference upkeep.4. Determine prohibited frequency There 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.
