Adaptec LSM-FC2002 Installation Guide - Page 21
Cooling System, Table 1-1, Fan Speed vs. Temperature Change
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21 Cooling System Cooling is provided by the two Advanced Cooling Modules (ACMs) located at the rear of the enclosure. Each of the ACM units contain two variable speed fans. The enclosure requires four fans for normal operation, but will operate correctly with one fan failed (redundancy is lost if one fan is failed in either ACM), however, it is recommended that the failed fan be replaced as soon as possible. The ACM units can be hot swapped. The LS Module monitors and controls the speed of each fan. The speed is set depending on the ambient temperature and failed status. The fans are set to full speed if one fan is failed. The following table shows how the fan speed relates to temperature change. Table 1-1 Fan Speed vs. Temperature Change ACM Speed Speed 1 Speed 2 Speed 3 Full Speed Ambient Temp (oC) 0 to 26 26 to 28 28 to 30 30 + Note: All fans in an enclosure are set to the same speed. Features
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