Current Release Control; Release Protective Control By Temperature Of Indoor Heat Exchanger - Toshiba RAS-M10GKCVP-E Service Manual

Item
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
Setup value
Low
Capacity control continues.
Outdoor temp.
40˚C
16˚C
11˚C
6. Release protec- <In cooling/dry operation>
tive control by
(Prevent-freezing control for indoor heat exchanger)
temperature of
In cooling/dry operation, the sensor of indoor heat ex-
indoor heat
changer detects evaporation temperature and controls the
exchanger
compressor speed so that temperature of the heat ex-
changer does not exceed the specified value.
Usual cooling capacity control
7˚C
6˚C
5˚C
Reduction of compressor speed
Operation flow and applicable data, etc.
Setup of current release point
£ High
Reduce compressor speed
Cooling current release value
39˚C
15.5˚C
10.5˚C
Outdoor temp. To
Current decrease
10.1A
8.0A
R
When the value is
in Q zone, the
Q
compressor speed
is kept.
P
– 33 –
Description
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.
1) When temperature of the indoor
heat exchanger drops below 5°C,
the compressor speed is
reduced. (P zone)
2) When temperature of the indoor
heat exchanger rises in the
range from 6°C to under 7°C, the
compressor speed is kept.
(Q zone)
3) When temperature of the indoor
heat exchanger rises to 7°C or
higher, the capacity control
operation returns to the usual
control in cooling operation.
(R zone)