Piping Diagram
Samsung Electronics 227
High Pressure Protection
ƒ Purpose
Prevent abnormal high pressure to protect the system and compressors.
ƒ Concept
The compressor operation frequency is lowered to decrease the high pressure.
ƒ Control specifications in detail
- The compressor operation frequency is controlled according to the
high pressure, as shown below.
1st step Hz hold: The current frequency is fixed. (It is possible to lower the frequency if necessary)
2nd ste
p Hz down: The frequency is forcibly lowered by 5Hz at specified intervals.
3rd step HP down: The frequency is forcibly lowered by 1Hz every second.
4th step Comp trip: Compressors stop and an error is triggered (E407).
Compressor Trip (E407)
High Pressure < 30 k gf /cm
2
,g : Compressor Trip release
Hz Hold area
Hz Down area
HP Down area
Normal op eration
Hz Hold release
Hz Down release
HP Down release
Compressor Trip (E407)
High Pressure < 30 k gf /cm
2
,g : Compressor Trip release
Hz Hold area
Hz Down area
HP Down area
Normal op eration
Hz Hold release
Hz Down release
HP Down release
T.HP = Target High Pressure
36
37
38
40
High Pressure (k gf /cm
2
,g )
32
& (T .HP + 4)
40
High Pressure (k gf /cm
2
,g )
30
& (T .HP + 3)
28
& (T.HP + 1.5)
Cooling
Heating
7-3 Functions (cont.)
7-3-2-5 Protective control
7-3-2 Control (cont.)
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