Daikin RXL25G2V1B, Руководство по обслуживанию

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SiENBE04-925_A Control Specification
Function and Control 35
3.2 Frequency Control
Outline Frequency is determined according to the difference between the room thermistor temperature
and the target temperature.
The function is explained as follows.
1. How to determine frequency
2. Frequency command from the indoor unit (Difference between the room thermistor temperature
and the target temperature)
3. Frequency initial setting
4. PI control
Detail
How to Determine Frequency
The compressor’s frequency is determined by taking the following steps.
1. Determine command frequency
Š
Command frequency is determined in the following order of priority.
1. Limiting defrost control time
2. Forced cooling
3. Indoor frequency command
2. Determine upper limit frequency
Š
The minimum value is set as an upper limit frequency among the frequency upper limits of
the following functions:
Compressor protection, input current, discharge pipe temperature, heating peak-cut, freeze-
up protection, defrost.
3. Determine lower limit frequency
Š
The maximum value is set as an lower limit frequency among the frequency lower limits of
the following functions:
Four way valve operation compensation, draft prevention, pressure difference upkeep.
4. Determine prohibited frequency
Š
There is a certain prohibited frequency such as a power supply frequency.
Command frequency Limit frequency
Skip control
Upper limit function
Compressor protection function
Lower limit function
Four way valve operating compensation, etc.
Target frequency
(R2831)
When the shift of the frequency is less than zero (
Δ
F<0) by PI control,
the target frequency is used as the command frequency.
Drooping function Input current
control, etc.
Upper limit frequency
FMAX
Lower limit frequency
FMIN
Initial frequency
PI control
Defrost control
SIENBE04-925_A_FRONT.pdf 49 24/02/2011 13:53:52