Toshiba RAS-10JKVP-E Service Manual page 28

Item
4. Capacity The cooling or heating capacity corresponding to the load is
control adjusted.
According to difference between the setup value of tempera-
ture and the room temperature, the capacity is adjusted by
varying No. of revolution of the compressor operation.
Temp. setup value (Ts)
5. Current release This function prevents troubles on the electronic parts such
control as GTr or compressor of the compressor driving inverter.
This function also controls No. of revolution of the compres-
sor so that power value of the compressor driving circuit
does not exceed the specified value.
Main circuit control current
of outdoor unit inverter
Capacity control continues.
45˚C
40˚C
16˚C
11˚C
Operation flow and applicable data, etc.
Remote controller
Ts –Ta
Correction of Hz signal
Detection of electromotive force
of compressor motor winding
Detection of motor rotating
position/No. of revolution
Correction value of Hz
signal Operating Hz
Inverter output change
Commutation timing change
Change of No. of
revolution of compressor
High
Operating current
Setup value
Low
Cooling current
Outdoor temp.
release value
44˚C
39˚C
15.5˚C
10.5˚C
Indoor unit
Indoor temp. (Ta)
Outdoor temp. To
Setup of current release point
Compressor operation
Hz down
Current down
Heating current
release value
5.62A
9.82A
9.00A
10.31A
10.80A
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Description
1) The difference between tempera-
ture set on remote controller (Ts)
and temperature of indoor unit
(Ta) is detected.
2) According to the temperature
difference, the correction value of
Hz signal which determines No.
of revolution of the compressor is
set up.
3) The rotating position/No. of
revolution of the motor are
detected by the electromotive
force occurred on the motor
winding along 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 No. of revolution of the
compressor motor by outputting
power to the compressor.
* The contents of control opera-
tion are same in cooling
operation and heating opera-
tion
1) The input current of the outdoor
unit is detected in the connecting
section of the outdoor unit
(Inverter assembly).
2) According to conditions of the
detected outdoor temperature,
the specified value of the current
is set up.
3) Whether the current value
exceeds the specified value or
not is judged by No. of revolution
of the compressor commanded
from the indoor unit.
4) If the current value exceeds the
specified value, this function
decreases No. of revolution of
the compressor and controls No.
of revolution up to the closest
one commanded from the indoor
unit within the range which does
not exceed the specified value.