User guide

18 19MAXDATA SR1202 M1 – Technical User GuideIntroduction
18 19MAXDATA SR1202 M1 – Technical User GuideIntroduction
PSU voltage operating ranges are nominally 115 V or 230 V AC, selected automatically.
Two LEDs mounted on the rear panel of the Power Supply module (see Figure 14) indicate the status
of the module:
Table 2. Power Supply LEDs
Power On & OK
(Green)
Module Fault
(Amber)
Status
Off Off No AC power (either PSU)
Off
On No AC power (this PSU only)
Off
On PSU Fault (over temp, over volts, over current, PSU fan failure)
On Off AC present, PSU on OK
On On Fan Fault
Multiple Power Supply Modules
The SR1202 must always be operated with two Power Supply modules fitted. The two Power Supply
modules operate together so that if one fails the other maintains the power supply and cooling while
you replace the faulty unit.
Module replacement should only take a few minutes to perform but must be completed within 10
minutes from removal of the failed module.
Cooling Module
The Cooling Module provides system cooling, thermal monitoring and control functions.
System airflow is from front to back of the enclosure:
• Cooling airflow passes over drives and through the midplane to a central plenum.
• The cooling module pulls air from the plenum and from the RAID Cnotroller Modules.
• The PSUs pull cooling air from the plenum at the rear of the enclosure.
 NOTE
The system must be operated with low pressure rear exhaust installation (back pressure created by
rack doors and obstacles not to exceed 5 pascals [0.5 mm water gauge])
The module incorporates an amber Cooling Module Fault LED, defined in Table 3
Table 3. Cooling Module Fault LED
Status Module Fault (Amber)
Enclosure Off - qualified by PSU and RAID Controller Module OK
lights
Off
Enclosure On - Fan OK Off
Fan Fail
On
Figure 15. Cooling Module Fault LED Label