Emerson AXP640-AC2-110VAC, Installation & Use Manual

Page: 149 / 190

Shelf Management Alarm Module
AXP640 Installation and Use (6806800M24E)
149
Using the above algorithm, at 40°C ambient, the cooling algorithm adjusts the fan speeds to
maintain a deltaT rise in temperature at 15°C.
The values for S1, S2, T1, and T2 are configurable.
In abnormal operating conditions; that is, when a blade thermal sensor is approaching or
crossed its upper non-critical threshold, the SAM automatically adjusts the fan speeds to a
point where all the blade thermal sensors are just below their upper non-critical threshold
(minus a user configurable offset).
The dynamic minimum fan level is not used.
There are three fan trays, each containing a single fan. Fan RPMs vary between 1000 and 11000
based on the commanded fan level (0 to 100).
7.5.2 Redundancy Control
The ShMM-1500R supports redundant operation with automatic switchover using a redundant
ShMM-1500R. In a configuration where two ShMM-1500Rs are present, one acts as the active
shelf manager and the other as a standby. Both ShMM-1500Rs monitor each other, and either
can trigger a switchover if necessary.
7.5.2.1 Hardware Redundancy Interface
The hardware redundancy signals of the ShMM-1500R are implemented as follows:
z
Cross connected ShMM-1500R present input (PRES_R#) and output (PRES_L#)
z
Cross connected ShMM-1500R status 0 input (SHMM_STATUS0_R) and output
(SHMM_STATUS0_L)
Table 7-5 Cooling Budget
Ambient Temperature Temperature Rise
25
°
C Delta T = 20
°
C
40
°
C Delta T = 15
°
C
55
°
C Delta T = 10
°
C