Samsung AM080FX A Series Service Manual page 338

Piping Diagram
7-3 Functions (cont.)
7-3-2 Control (cont.)
7-3-2-5 Protective control (cont.)
Maximum current limit (each compressor)
▪ Purpose
Prevent device damage due to excess current in circuit components or overheating of the IPM module.
▪ Concept
- The compressor operation frequency is controlled to prevent each INV PBA input current (CT) from exceeding the designed current limit.
- The compressor operation temperature is controlled to prevent each INV PBA output current (OCT) from exceeding the designed current limit.
▪ Control specifications in detail
- The compressor frequency is controlled according to the INV PBA input current (CT) for each compressor, as shown below.
1st step Hz hold: The current frequency is fixed. (It is possible to lower the frequency if necessary)
2nd step HP down: The frequency is forcibly lowered by 1Hz at specified intervals.
3RD step Comp trip: Compressors stop and an error is triggered (E462).
CT(A)
Comp Trip
Ampere
HP Down
Ampere
Hz hold
Ampere
- The compressor frequency is controlled according to the INV PBA output current (OCT) for each compressor, as shown below.
1st step Hz hold: The current frequency is fixed. (It is possible to lower the frequency if necessary)
2nd step HP down: The frequency is forcibly lowered by 1Hz at specified intervals.
3RD step Comp trip: Compressors stop and an error is triggered (E462).
OCT(A)
If an error is sent from
the INV controller
HP Down
Ampere
Hz Down
Ampere
Samsung Electronics
Compressor Trip (E462)
HP Down area
Hz Hold area
Normal operation
Compressor Trip (E464, 465, 364, 365)
HP Down area
Hz Hold area
Normal operation
HP Down release
Hz Hold release
HP Down release
Hz Hold release
357