Samsung AM080FXWANR - Page 238

Piping Diagram
Samsung Electronics 237
Maximum current limit (each compressor)
ƒ Purpose
Prevent device damage due to excess current in circuit components or overheating of the IPM module.
ƒ Concept
- The compressor operation frequency is controlled to prevent each INV PBA input current (CT) from exceeding the designed current limit.
- The compressor opera
tion temperature is controlled to prevent each INV PBA output current (OCT) from exceeding the designed current limit.
ƒ 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 fre
quency is fixed. (It is possible to lower the frequency if necessary)
2nd step HP down: The frequency is forcibly lowered by 1Hz at specified inte
rvals.
3RD step Comp trip: Compressors stop and an error is triggered (E462).
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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 fre
quency is fixed. (It is possible to lower the frequency if necessary)
2nd step HP down: The frequency is forcibly lowered by 1Hz at specified inte
rvals.
3RD step Comp trip: Compressors stop and an error is triggered (E462).
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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.)