RAID Array 3000 Controller Shelf
1.5.4 Shelf Cooling
The device I/O module ensures that the SBBs and Controller Shelf are at the proper operating temperature by monitoring the operational status of the blowers and sensing the ambient air temperature.
The two
The device I/O module ambient temperature circuitry monitors the air flowing through the module. If the ambient temperature exceeds 32ºC + 2º C, the cir- cuitry:
∙Turns on both blower LEDs
∙Causes both blowers to switch to the
When the I/O module circuitry detects a blower that is not operating or not oper- ating at the correct RPM, this circuitry:
∙Turns ON a LED on the I/O module front panel that identifies the defective blower
∙Causes the operational blower to switch to the
NOTE
The Controller Shelf power supply status LEDs also display blower error conditions. However, they do not identify the defective blower, nor do they report ambient air temperature faults.
1.5.5 Controller Shelf Power Supplies
The Controller Shelf has two interchangeable,