Capacity Control; Current Release Control - Toshiba RAS-B10EKVP-E Service Manual

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Item
4. Capacity The cooling or heating capacity depending on the load is
control adjusted.
According to difference between the setup value of tem-
perature and the room temperature, the capacity is ad-
justed by the compressor revolution.
Remote controller
5. Current release This function prevents troubles on the electronic parts of
control the compressor driving inverter.
This function also controls drive circuit of the compressor
speed so that electric power of the compressor drive circuit
does not exceed the specified value.
Outdoor unit inverter main
circuit control current
Operating current ≤
Capacity control continues.
45˚C
40˚C
16˚C
11˚C
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Operation flow and applicable data, etc.
Set temp. (Ts)
Ts –Ta
Correction of Hz signal
Detection of electromotive force
of compressor motor winding
Detection of motor speed
and rotor position
Correction value of Hz
signal ≤ Operating Hz
Inverter output change
Commutation timing change
Change of compressor speed
Setup of current release point
High
Reduce compressor speed
Setup value
Low
Cooling current
Outdoor temp.
release value
6.45A
6.75A
44˚C
39˚C
15.5˚C
8.47A
10.5˚C
Indoor unit
Room temp. (Ta)
Outdoor temp. To
Current decrease
Heating current
release value
7.72A
9.22A
10.80A
– 31 –
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 commu-
tation 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 opera-
tion
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
specified value of the current is
selected.
3) Whether the current value
exceeds the specified value or
not is judged.
4) If the current value exceeds the
specified 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
specified value.