Datasheet

1200-Watt AC-Input Power Supply Replacement Instructions 7
Environmental Monitoring
— Power supply detected an overvoltage, overcurrent, AC or DC undervoltage, or
overtemperature condition within the power supply. This includes operator shutdown by
turning off the system power switch, which the power supply interprets as an undervoltage
condition.
— The chassis interface detected an overtemperature condition within the system.
• Blower failure—The blower impeller has stopped turning. A warning message is displayed on
the console, and the system continues operating until it shuts itself down because of overheating.
Note In the Cisco 7513, a hard shutdown is achieved by disabling the power source. In the Cisco
7576, both routers share the same power source. In the Cisco 7576, when one router senses a
problem requiring a hard shutdown, the RSP and all IPs installed in that router (only) are powered
off. In the first 14 temperature cycles, the RSP and IPs are powered back on once the temperature
of the system falls below a certain temperature setpoint. At the fifthteenth temperature cycle, this
temperature setpoint is changed to a very low value, preventing the affected router from powering
back up.
This achieves a hard shutdown of one router without affecting the other router. The RSP and IPs will
remain disabled until the power is manually recycled. This allows you to choose a suitable time to
recycle the power when it will not adversely affect your users.
Table 2 Typical Processor-Monitored Temperature Thresholds
Table 3 Typical Power Supply-Monitored DC-Voltage Thresholds
If the air temperature exceeds a defined threshold, the system processor displays warning messages
on the console terminal. If the temperature exceeds the shutdown threshold, the processor shuts
down the system. The system stores the present parameter measurements for both temperature and
DC voltage in NVRAM, so that you can retrieve them later as a report of the last shutdown
parameters.
Parameter Normal High Warning High Critical Shutdown
Inlet 10–40 C 44 C 50 C –
Hotpoint 10–40 C 54 C 60 C –
Exhaust 10–40 C – – –
Processors – – – 70 C
Power supply – – – 75 C
1
1 Processor-monitored power supply shutdown is not supported on the Cisco 7576.
Restart 40 C – – –
Parameter Normal Low Critical Low Warning High Warning High Critical
+5V 4.74 to 5.26 4.49 4.74 5.25 5.52
+12V 10.20 to 13.8 10.76 11.37 12.64 13.24
–12V –10.20 to –13.80 –10.15 –10.76 –13.25 –13.86
+24V 20.00 to 28.00 19.06 21.51 28.87 26.51