Control Specification
SiMT041509E
33
Function and Control
3.2
Frequency Control
Outline
The compressor frequency is determined according to the difference between the room
thermistor temperature and the target temperature.
Detail
For Cooling Only Model
1. Determine command frequency
Command frequency is determined in the following order of priority.
1. Forced cooling
2. Indoor frequency command
2. Determine upper limit frequency
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, freeze-up protection.
3. Determine lower limit frequency
The maximum value is set as a lower limit frequency among the frequency lower limits of the
following function:
Pressure difference upkeep.
4. Determine prohibited frequency
There is a certain prohibited frequency such as a power supply frequency.
For Heat Pump Model
1. Determine command frequency
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
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 control.
3. Determine lower limit frequency
The maximum value is set as a lower limit frequency among the frequency lower limits of the
following functions:
Four way valve operation compensation, draft prevention, pressure difference upkeep.
Command frequency
Limit frequency
Skip control
Lower limit function
Four way valve operation compensation (
∗
), etc.
Initial frequency
PI control
Defrost control (
∗
)
Dropping function
Input current control, etc.
Upper limit function
Compressor protection function
Upper limit frequency
FMAX
Lower limit frequency
FMIN
Target frequency
(R17857)
When the shift of the frequency is less than zero (
∆
F<0) by PI control,
the target frequency is used as the command frequency.
(
∗
): only for heat pump models
Summary of Contents for FTKM18PVMK
Page 16: ...SiMT041509E 1 List of Functions Part 1 List of Functions 1 Functions 2 ...
Page 18: ...SiMT041509E 3 Specifications Part 2 Specifications 1 Specifications 4 ...
Page 59: ...SiMT041509E Remote Controller 44 Part 5 Remote Controller 1 Remote Controller 45 ...
Page 118: ...Revision History Month Year Version Revised contents 07 2015 SiMT041509E First edition ...
