Samsung AM080FX A Series - Page 338

Samsung Electronics 357
Piping Diagram
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)
Hz hold
Ampere
HP Down
Ampere
Comp Trip
Ampere
Compressor Trip (E462)
HP Down area
Hz Hold area
Normal operation
HP Down release
Hz Hold release
- 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)
Hz Down
Ampere
HP Down
Ampere
If an error is sent from
the INV controller
Compressor Trip (E464, 465, 364, 365)
HP Down area
Hz Hold area
Normal operation
HP Down release
Hz Hold release
7-3 Functions (cont.)
7-3-2-5 Protective control (cont.)
7-3-2 Control (cont.)