36 QXS G2 Hardware Installation and Maintenance Guide
Figure 41 provides an illustration of the PSU (with LEDs) for the 2U12 and 2U24 chassis. The diametric
rear orientation in Figure 41 shows the PSU aligned for insertion into the right-hand PSU slot (PSU1)
located on the 2U12 or 2U24 chassis rear panel.
Figure 41 PSU 2U12/2U24 Chassis
Multiple PSUs
The 2U12 and 2U24 storage systems include two PSUs which provide redundant power control for
the system so that if one PSU fails, the other maintains the power supply, and chassis operation is not
affected while you replace the faulty PSU.
PSUs are hot-pluggable, and replacement should only take a few seconds to do. Replacement must
be completed as soon as possible after the removal of the defective PSU to avoid a thermal exception.
The replacement procedure should be completed within an absolute maximum of 2 minutes.
Operation of the chassis with any modules missing will disrupt the airflow, and the drives will not
receive sufficient cooling. It is essential that all slots are fitted with PSUs prior to powering on the
chassis.
System Airflow
The system must be operated with low pressure rear exhaust installation. Back pressure created by
rack doors and obstacles is not to exceed 5 pascals (0.5mm water gauge). The cooling system
provides sufficient capacity to ensure that maximum temperatures are not exceeded.
The environment in which the chassis operates must be dust-free to ensure adequate airflow.
2
3
1
4
1
PSU OK LED: Green
2
DC Fail LED: Amber/blinking amber
3
Fan Fail LED: Amber/blinking amber
4
AC Fail LED: Amber/blinking amber
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