1200-Watt AC-Input Power Supply Replacement Instructions 5
Environmental Monitoring and Reporting Functions
Figure 4
On/off Switch Locking Mechanism
•
A captive installation screw at the bottom of the power supply front panel provides electrical
grounding and prevents the power supply from vibrating or sliding out of the bay and dislodging
from the power connectors in the backplane. (See Figure 3.)
•
A spring clip on the AC receptacle supplies strain relief and prevents the power supply power
cable from being pulled out accidentally.
The power supplies are self-monitoring. Each supply monitors its own temperature and internal
voltages. An internal fan in each power supply draws cooling air from the rear of the chassis, through
the power supply, and out the front of the chassis. The power supply airflow is separate from that of
the rest of the chassis.
Environmental Monitoring and Reporting Functions
The environmental monitoring and reporting functions, controlled by the chassis interface board,
enable you to maintain normal system operation by identifying and resolving adverse conditions
prior to loss of operation. The environmental monitoring functions constantly monitor the internal
chassis air temperature and DC supply voltages and currents. Each power supply monitors its own
voltage and temperature and shuts itself down if it detects a critical condition within the power
supply. If conditions reach shutdown thresholds, the system shuts down to avoid equipment damage
from excessive heat. The reporting functions periodically log the values of measured parameters so
that you can retrieve them for analysis later, and the reporting functions display warnings on the
console if any of the monitored parameters exceed defined thresholds.
In addition to monitoring internal temperature and voltage levels, the system also monitors the
blower. If the blower fails, the system displays a warning message on the console. If the blower is
still not operating properly after two minutes, the system shuts down to protect the internal
components against damage from excessive heat.
H5266
0
I
Power
switch
Locking device
