SiSG121917E
Control Specification
Part 4 Functions and Control
78
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, low Hz high pressure
limit, 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 functions:
Draft prevention, pressure difference upkeep.
4.
Determine prohibited frequency
There is a certain prohibited frequency such as a power supply frequency.
Parameters
Q value
Indoor unit output determined from indoor unit volume, airflow rate and other factors.
S value: Indoor Unit Capacity
S value is the capacity of the indoor unit, and is used for frequency command.
Ex:
D signal: Indoor frequency command
The difference between the room thermistor temperature and the target temperature is taken as
the
D value and is used for
D signal of frequency command.
Values depend on the type of indoor unit.
OFF = Thermostat OFF
Initial Frequency
When starting the compressor or when conditions are varied due to a change of operating
rooms, the frequency must be initialized according to the total of the maximum
D value of each
room and the total Q value (
Q) of the operating room (the room in which the thermostat is set
to ON).
PI Control
1.
P control
Maximum
D is calculated in each sampling time (20 seconds), and the frequency is
adjusted according to its difference from the frequency previously calculated.
2.
I control
If the operating frequency does not change for more than a certain fixed time, the frequency
is adjusted according to maximum
D value.
When maximum
D is low, the frequency is lowered.
When maximum
D is high, the frequency is increased.
3.
Limit of frequency increasing range
When the difference between the input current and the dropping value of the input current is
less than 1.5 A, the frequency increasing range must be limited.
4.
Frequency control when other controls are functioning
When frequency is dropping:
Frequency control is carried out only when the frequency drops.
Capacity
S value
Capacity
S value
2.5 kW
25
5.0 kW
50
3.5 kW
35
6.0 kW
60
Temperature
difference
D
signal
Temperature
difference
D
signal
Temperature
difference
D
signal
Temperature
difference
D
signal
–2.0
OFF
0
4
2.0
8
4.0
C
–1.5
1
0.5
5
2.5
9
4.5
D
–1.0
2
1.0
6
3.0
A
5.0
E
–0.5
3
1.5
7
3.5
B
5.5
F
Содержание FDMR50TVMG
Страница 185: ...SiSG121917E Check Part 6 Service Diagnosis 180 50 65 80 class 90 class V U DC DC R22378 W R21130 W V U DCP2 DCM2 ...
Страница 212: ...Piping Diagrams SiSG121917E 207 Part 8 Appendix MKS65TVMG MKB65TVMG MKS80TVMG 3D103941A 3D103942A ...
Страница 213: ...SiSG121917E Piping Diagrams Part 8 Appendix 208 MKS90TVMG 3D104086 ...
Страница 223: ...SiSG121917E Operation Limit Part 8 Appendix 218 3 Operation Limit MKS50 65 80 90TVMG MKB50 65TVMG 4D078793B ...
