Capacity Control - Toshiba RAS-M07N4KVRG-E Service Manual

Item
3. Capacity The cooling or heating capacity depending on the load is
control adjusted.
According to difference between the setup value of tempera-
ture and the room temperature, the capacity is adjusted by
the compressor revolution.
Remote controller
Set temp. (Ts)
Detection of electromotive force
Detection of motor speed and rotor position
Correction value of Hz signal ≤ Operating Hz
Operation flow and applicable data, etc.
Ts –Ta
Correction of Hz signal
of compressor motor winding
Inverter output change
Commutation timing change
Change of compressor speed
Indoor unit
Room temp. (Ta)
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Description
1) The difference between set
temperature on remote controller
(Ts) and room temperature (Ta)
is calculated.
2) According to the temperature
difference, the correction value of
Hz signal which determines the
compressor speed is set up.
3) The rotating position and speed
of the motor are detected by the
electromotive force occurred on
the motor winding with operation
of the compressor.
4) According to the difference
resulted from comparison of the
correction value of Hz signal with
the present operation Hz, the
inverter output and the commuta-
tion timing are varied.
5) Change the compressor motor
speed by outputting power to the
compressor.
* The contents of control
operation are same in cooling
operation and heating
operation