SiMX042215E
Control Specification
Part 4 Functions and Control
37
Note
3. Control Specification
3.1 Mode Hierarchy
Outline
The air conditioner control has normal operation mode, forced operation mode, and power
transistor test mode for installation and servicing.
Details
Unless specified otherwise, dry operation command is regarded as cooling operation.
3.2 Frequency Control
Outline
The compressor frequency is determined according to the difference between the room
thermistor temperature and the target temperature.
Details
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 the 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 the lower limit frequency among the frequency lower limits of
the following function:
Pressure difference upkeep.
(R20475)
Air conditioner control mode
Forced operation mode
Forced cooling operation (for p
u
mp do
w
n operation)
Po
w
er transistor test mode
N
ormal operation mode
Fan
Cooling (incl
u
des drying)
Stop (indoor
u
nit: OFF)
Command frequency
Limit frequency
Skip control
Lower limit function
Initial frequency
PI control
Dropping function
Input current control, etc.
Upper limit function
Compressor protection function
Upper limit frequency
FMAX
Lower limit frequency
FMIN
Target frequency
(R12230)
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.
