Samsung AM072BXV Series Service Manual page 264

Piping Diagram
7-3 Functions (cont.)
7-3-2 Control (cont.)
7-3-2-5 Protective control (cont.)
Maximum current limit (total)
▪ Purpose
Prevent operation if the electric current capacity is exceeded.
▪ Concept
- The compressor operation frequency is lowered to prevent the electric current used to operate outdoor units from exceeding
the maximum electric current.
- Outdoor unit current = Compressor current + Outdoor fan current (= CT1 + CT2)
※ CT1 = Compressor 1 current + Fan current
- Maximum outdoor unit current = Maximum current of the system x Set value
- Set value : 50-100% (default 100%). The value can be set from outdoor unit options or the upper-level controller.
A value below 100% will degrade performance.
▪ Control specifications in detail
- The frequency is controlled according to the outdoor unit current, as shown below.
1st step Hz hold : The current frequency is fixed if the outdoor unit current at present is higher than 95% of the maximum current.
(It is possible to lower the frequency if necessary)
2nd step Hz down : The frequency is forcibly lowered by 5Hz at specified intervals
if the outdoor unit current at present is higher than the maximum current.
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