Initialization Delay Use Cases; Inrush Current And Inrush Guard Delay; Trip Cause Outlet Handling - LEGRAND Server Technology PRO4X User Manual

Option Function
last known Restores the outlet(s) to the previous power state(s) before the PRO4X
was powered off.
When configuring an individual outlet, there is one more outlet state option.
Additional option
PDU defined (on/off/last-
known)

Initialization Delay Use Cases

Apply the initialization delay in either of the following scenarios.
• • When power may not initially be stable after being restored
• •
When UPS batteries may be charging
Tip: When there are a large number of outlets, set the value to a smaller number to
avoid a long wait before all outlets are available.

Inrush Current and Inrush Guard Delay

▶
Inrush current:
When electrical devices are turned on, they can initially draw a very large current known as inrush
current. Inrush current typically lasts for 20-40 milliseconds.
▶
Inrush guard delay:
The inrush guard delay feature helps prevent a circuit breaker trip due to the combined inrush current
of many devices turned on at the same time.
For example, if the inrush guard delay is set to 100 milliseconds and two or more outlets are turned on
at the same time, the PDU will sequentially turn the outlets on with a 100 millisecond delay occurring
between each one.

Trip Cause Outlet Handling

When an outlet has been suspected as the cause of a trip, the Trip Cause Outlet Handling setting allows
you to mark the outlet as Suspended.
A Suspended outlet is handled differently than usual:
Function
Follows the global outlet state setting, which is set on
the PDU page.
The value in parentheses is the currently-selected global
option.
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