11990-190/192
Fan Trays
20
R1.0, October 2018
6.4 Fan Tray Signals
The Fan Tray provides signals for:
•
Voltage monitoring
•
Status of the Hot Swap Controller
•
Fan Speed
•
Temperature
These signals are controlled by the IPM Controller devices on the Fan Tray
PCB. The Shelf Manager has access to these signals via IPMB.
6.5 Fan Tray Temperature Sensor
The temperature sensors (LM75) in the Fan Trays measure the input and
exhaust temperatures of the Shelf.
6.6 Fan Tray Connectors and Indicators
The front panel includes a green and red Status LED and a blue hot-swap LED.
The Hot-Swap push button indicates to the Shelf Managers that the Fan Tray is
about to be removed. Its use is optional, but it is provided so that service
personnel can be trained to look for a blue LED to be illuminated on any active
component before removing it from the system. Once the operator pushes the
Hot-Swap button, the Shelf Manager is informed of the pending extraction.
When the Shelf Manager feels it is “safe“ to remove the Fan Tray, the blue Hot-
Swap LED illuminates solid.
Table 4: LEDs on Fan Tray front panel
Color
Description
Status
Condition
Green/Red
Status LED
Off
No Power to the Fan Tray
Solid green
Normal Operation
Solid red
Attention Status (error condition)
Blue
Hot Swap LED
Off
No Power to the Fan Tray or not
OK to extract Fan Tray
Short blink
Preparing for extraction
Solid blue
Ready to remove
