Environmental Status Module; Figure 5-7 Power Supply Canister - Silicon Graphics TP9400 RAID Owner's Manual

Environmental Status Module

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Locking Lever
Power Cord Connector
Power Switch
Power Indicator
Fault Indicator
Figure 5-7 Power Supply Canister
Both power supply canisters have a built-in sensor that detects the following conditions:
• Over-voltage
• Over-current
• Overheated power supply
If any of these conditions occurs, one or both power supplies will shut down. All power
remains off until you cycle the power switches (turn the power switches off, wait at least
30 seconds, then turn the power switches on). See "Overtemp Condition" on page 87 for
more information on recovering from an overtemp condition.
Because the two power supplies provide redundancy, you can hot swap a failed power
supply, replacing it while the drive enclosure is in operation.
Each environmental status module contains an ESM (Environmental Services Monitor)
board and two slots for GBICs. The ESM board is the interface between the controller
enclosure and the drive enclosure, and it monitors drive enclosure status. The canisters
fit into the rear of the drive enclosure (Figure 5-8).
Drive Enclosure Components
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