Cabletron Systems SFCS-200WG - Manual (Page 42)

3-16
Switch Hardware
3.2.4.3.1 Power 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
3.2.4.3.2 Shutdown 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.