Daikin F-Series Service Manual page 95

Control Specification
2. Determine upper limit frequency
3. Determine lower limit frequency
4. Determine prohibited frequency
Indoor Frequency Command (
The difference between a room temperature and the temperature set by the remote controller
will be taken as the "
∗
Th OFF = Thermostat OFF
Indoor Unit Capacity (S value)
The capacity of the indoor unit is a "S" value and is used for frequency command.
Frequency Initial Setting
<Outline>
When starting the compressor, or when conditions are varied due to the change of the operating
room, the frequency must be initialized according to the total of a maximum
and a total value of Q (
Q value: Indoor unit output determined from indoor unit volume, air flow rate and other factors.
PI Control
1. P control
2. I control
3. Limit of frequency variation width
4. Frequency management when other controls are functioning
84
Set a minimum value as an upper limit frequency among the frequency upper limits of the
following functions:
Compressor protection, input current, discharge pipes, freeze-up protection, dew prevention,
fin thermistor temperature.
Set a maximum value as an lower limit frequency among the frequency lower limits of the
following functions:
Pressure difference upkeep.
There is a certain prohibited frequency such as a power supply frequency.
∆
D signal" and is used for frequency command.
∆D
Temperature Temperature
difference signal
∗Th
0
OFF
0.5 1
1.0 2
1.5 3
Capacity
2.5 kW
3.5 kW
5.0 kW
Σ
Q) of the operating room (the room in which the thermostat is set to ON).
(Determine Frequency Up / Down by
∆
Calculate a total of the
frequency according to its difference from the frequency previously calculated.
If the operating frequency is not change more than a certain fixed time, adjust the frequency
up and down according to the
Σ∆
When the D value is small...lower the frequency.
Σ∆
When the D value is large...increase the frequency.
When the difference between input current and input current drooping value is less than 1.5
A, the frequency increase width must be limited.
When each frequency is drooping;
Frequency management is carried out only when the frequency droops.
For limiting lower limit
Frequency management is carried out only when the frequency rises.
∆
D signal)
∆D
Temperature
difference signal difference
2.0 4
2.5 5
3.0 6
3.5 7
S value
25
35
50
∆
D Signal)
D value in each sampling time (20 seconds), and adjust the
Σ∆
D value, obtaining the fixed
∆D
Temperature
signal difference
4.0 8 6.0
4.5 9 6.5
5.0 A 7.0
5.5 B 7.5
Capacity
6.0 kW
7.1 kW
∆
D value of each room
Σ∆
D value.
Function and Control
SiBE12-713
∆D
signal
C
D
E
F
S value
60
71