Samsung AM072BXV Series Service Manual page 263

Piping Diagram
7-3 Functions (cont.)
7-3-2 Control (cont.)
7-3-2-5 Protective control (cont.)
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.
IPM temperature (℃)
If an error is sent from
the INVc ontroller
Samsung Electronics
Compressor Trip (E400 or E500)
HP Down area
Compressor trip (E400 or E500) occurs if in this state for 10 min
98
Hz Down area
93
Hz Hold area
90
Normal operation
HP Down release
Hz Down release
Hz Hold release
257