HP UPS Network Module User Manual page 54

When the utility power is lost, the example UPS behaves as follows:
On load segment 1:
1.
Client1—The UPS Network Module waits until t2 to start OST. The server is powered down before
a.
t3.
Client2—The UPS Network Module waits until t2 to start OST. The server is powered down
b.
sometime t3.
UPS Network Module—The UPS Network Module waits until t2 to send shutdown commands to
c.
load segment 1 and all Clients. Load segment 1 powers down at t3.
On load segment 2:
2.
Client3—Because the OST of this Client is the longest, it replaced the OST of the UPS Network
a.
Module after it was connected to the UPS Network Module. Client 3 powers down as configured.
Client4—Because the SIA of the UPS Network Module is less than that of Client 4, the UPS Network
b.
Module starts the shutdown process first. Client 4 is forced to start its OST at the same time.
UPS Network Module—The UPS Network Module waits until t2 to initiate the shutdown sequence
c.
for load segment 2 and the other Clients. Load segment 2 powers down at a new t3 which is the
same as the longest Client OST.
UPS—Between the two OST of UPS Network Module on load segment 1 and load segment 2, the UPS
3.
starts its countdown at t2 of UPS Network Module on load segment 2, because it received the shutdown
command from it first and then powered down at t3 of UPS Network Module on load segment 2 also
because it ends last.
When the utility power is restored, the example UPS behaves as follows:
t5—If the Battery capacity exceeds condition exists, the UPS is powered on.
1.
t6 and t7—If the Switch On after condition exists, the LS is powered on.
2.
If Automatic Power ON is enabled in the BIOS setup of the Client server, the server will be powered on
3.
as soon as power is detected.
Configuration parameters 54