Current Release Control; High-Pressure Release Control - Toshiba RAS-24N3KV2-A Service Manual

Item
7. Current This function prevents troubles on the electronic parts of the
release control 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.
Current release control value (11)
Temperature range
50°C ≤ TO
45°C ≤ TO < 50°C
39°C ≤ TO < 45°C
TO < 39°C
TO error
1) When the over-current protective circuit detected an abnormal current, stop the compressor.
2) The compressor restarts after 2 minutes 30 seconds as setting [1] as an error count.
3) When the error count [8] was found, determine an error and restart operation is not performed.
4) For the error display contents, confirm on the check code list.
8. High-pressure 1) The operation frequency is controlled to restrain abnormal rising of high pressure by TL
release control sensor in cooling operation and TC sensor in heating operation.
2) When TL sensor in cooling operation or TC sensor in heating operation detects abnormal
temperature of the stop zone, stop the compressor and the error count becomes +1.
3) When the compressor stopped with 2), the operation restarts from the point of the normal
operation zone (e point or lower) where it returned after 2 minutes 30 seconds.
4) The error count when the compressor stopped with 2) is cleared after the operation continued
for 10 minutes. If the error count becomes [10] without clearing, the error is determined and
reactivation is not performed.
5) For the error display contents, confirm on the check code list.
HEAT TC / COOL TL
[˚C]
a
Frequency normal down
b
Frequency slow down
c
d
Frequency slow up (Up to command)
e
Operation flow and applicable data, etc.
Outdoor temperature To
Setup of current release point
High
Reduce compressor speed
Current decrease
[A]
I1
9.5
9.5
13.0
16.0
9.5
Abnormal stop
Frequency hold
As command is
Current [A]
1
1
Hold
1
1–1.0
Normal operation
a
b
c
d
e
– 34 –
FILE NO. SVM-13004
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.
Frequency down
Hold
HEAT COOL
TC TL
61°C 63°C
56°C 62°C
54°C 60°C
52°C 58°C
48°C 54°C