Capacity Control - Toshiba RAS-13G2KCVP-T Service Manual

Item
4.. Capacity The cooling capacity depending on the load is adjusted.
control According to difference between the set up value of temperature and the room temperature,
the capacity is adjusted by the compressor revolution.
Remote controller
Set temp. (Ts)
Detection of motor speed and rotor position
Correction value of Hz signal ≤ Operating Hz
5.. Curre
This function prevents troubles on the electronic parts of the compressor driving inverter.
release
This function also controls drive circuit of the compressor speed so that electric power of the
control
compressor drive circuit does not exceed the specifi ed value.
Outdoor unit inverter main
circuit control current
Operating current ≤ Setup value
Low
Capacity control continues.
Outdoor temp.
45°C
40°C 44°C
16°C 39°C
11°C 15.5°C
10.5°C
Operation flow and applicable data, etc.
Ts –Ta
Correction of Hz signal
Detection of electromotive force
of compressor motor winding
Inverter output change
Commutation timing change
Change of compressor speed
Setup of current release point
High
Reduce compressor speed
Cooling current release value
13K
10K
4.27A 4.27A
5.40A 5.40A
6.07A 6.07A
Indoor unit
Room temp. (Ta)
Outdoor temp. To
Current decrease
18K
4.88A
6.15A
8.02A
- 32 -
FILE NO. SVM-15058
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 commutation 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.
1 The input current of the outdoor unit
is detected in the inverter section of
the outdoor unit.
2 According to the detected outdoor
temperature, the specifi ed value of
the current is selected.
3 Whether the current value exceeds
the specifi ed value or not is judged.
4 If the current value exceeds the
specifi ed value, this function
reduces the compressor speed and
controls speed up to the closest
one commanded from the indoor
unit within the range which does not
exceed the specifi ed value.