Janu
ary 201
9
104 Legrand PDU User Guide
Options for Outlet State on Startup
The following are available options for initial power states of outlets after powering up the Legrand PDU
device.
Option
Function
on
Turns on the outlet(s).
off
Turns off the outlet(s).
last known
Restores the outlet(s) to the previous power state(s)
before the Legrand PDU was powered off.
If you are configuring an individual outlet on
Individual Outlet Pages
(on page 114), there is one more outlet
state option.
Additional
option
Function
PDU defined
(xxx)
Follows the global outlet state setting, which is set on
PDU
(on page 102).
The value xxx in parentheses is the
currently-selected global option -
on
,
off
, or
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.
