Cabletron Systems 9A000 manual 3-16, Switch Hardware, Power Supply LEDs, Shutdown Conditions

Switch Hardware

3.2.4.3.1Power Supply LEDs

There are four LEDs on the front panel of the model B SFCS-1000 AC power supply which indicate the status of the power supply. The LEDs and their functions are described in the following table:

Table 3.6 - SFCS-1000 Power Supply LED Descriptions

3.2.4.3.2Shutdown Conditions

To avoid damaging itself or the switch, the model B SFCS-1000 AC power supply shuts itself down under the following error conditions:

Input undervoltage The AC line voltage is below 87 ±5VAC RMS.

Output undervoltage Output 1 is 42 ±2 VDC or Output 2 is below 4.5

±0.25 VDC. Shutdown from undervoltage is defeated during power-up period (2 seconds maximum) to allow slow-start.

Output overvoltage The voltage at Output 1 or Output 2 is above 125% ±8% of the nominal voltage.

Overtemperature Any power semiconductor has reached 90% of its maximum junction temperature.

NOTE: The SFCS-1000 CEC can not shut down the model B power supply. Only the power sup- ply can shut down and restart itself.

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