Samsung Electronics 355
Piping Diagram
IPM (Intelligent Power Module) temperature protection
▪ Purpose
Prevent IGBT module damage due to overheating.
▪ Concept
The compressor operation frequency is lowered to decrease the IPM temperature.
▪ Control specifications in detail
- The compressor frequency is controlled according to the IPM temperature, as shown below.
1st step Hz hold : The current frequency is fixed. (It is possible to lower the frequency if necessary)
2nd step 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.
If in this state for 10min, compressors stop and an is triggered (E400 or E500).
4th step Comp trip : Compressors stop and an error is triggered (E407).
If restarting the compressor, -10℃ is applied for 60 min as the temperature required to
enter protective control mode.
If an error is sent from
the INVc ontroller
IPM temperature (℃)
90
93
98
Compressor Trip (E400 or E500)
HP Down area
Hz Down area
Hz Hold area
Normal operation
Hz Hold release
Hz Down release
HP Down release
Compressor trip (E400 or E500) occurs if in this state for 10 min
7-3 Functions (cont.)
7-3-2-5 Protective control (cont.)
7-3-2 Control (cont.)
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