SiBE05-722EE Control Specification
Functions and Control 43
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.
4. Determine prohibited frequency
There is a certain prohibited frequency such as a power supply frequency.
Initial Frequency When starting the compressor, the frequency is initialized according to the ∆D value of the
indoor unit.
∆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.
∗OFF: Thermostat OFF
PI Control 1. P control
The ∆D value is calculated in each sampling time (15 ~ 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 the ∆D value.
When the ∆D value is low, the frequency is lowered.
When the ∆D value is high, the frequency is increased.
3. Frequency management when other controls are functioning
When frequency is dropping;
Frequency management is carried out only when the frequency drops.
For controlling lower limit;
Frequency management is carried out only when the frequency rises.
4. Upper and lower limit of frequency by PI control
The frequency upper and lower limits are set according to the command of the indoor unit.
When the indoor or outdoor unit quiet operation command comes from the indoor unit, the
upper limit frequency is lower than the usual setting.
Temperature
difference
∆D
signal
Temperature
difference
∆D
signal
Temperature
difference
∆D
signal
Temperature
difference
∆D
signal
–2.0 ∗OFF0 42.084.0C
–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
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