Allied Telesis AT-CV5001 - Manual (Page 22)

Chapter 1: Overview
22
Power Supply
Alerts and
Shutdown
The power supply automatically shuts down if the internal temperature of
the chassis exceeds 70 ° C (158° F), and starts again when the
temperature returns below 65° C (149° F).
If the speed of the fan in the power supply falls below 2000 RPM or if the
fan stops completely, the management card, if present, transmits an
SNMP trap and enters a message in the event log, alerting you to the
problem.
The management card has two temperature thresholds and sends a trap
when either threshold is exceeded. One of the thresholds is adjustable
and the other is not. The adjustable threshold is set in the Temperature
Threshold Configuration menu in the management software and has a
default setting is 60° C (140° F). This is the temperature threshold at which
the management card speeds up or slows down the cooling fan in the
power supply. If this setting is left unchanged, the management card may
send a series of SNMP traps if the operating temperature hovers at that
point. To avoid this, you may want to consider raising or lowering this
setting. For instructions, refer to the Converteon AT-S73, AT-S99 and
AT-S102 Management Software User’s Guide. Here is the trap for this
threshold:
Fan Tray #1/2: Fan Temperature Exceed Limit
The second temperature threshold, which is not adjustable, is 65° C (149°
F), five degrees below the temperature at which the power supply
automatically shuts down. This temperature threshold alerts you if the
power supply is close to shutting down because of a temperature problem.
Here is the trap for this threshold:
Temp exceeded 65 deg C in module A/B