LEGRAND Raritan PX3TS, User Manual

Page: 232 / 911

Chapter 7: Using the Web Interface
212
PX3TS Latching Relay Behavior
PX3TS incorporates latching relays in models with outlet switching. Unlike
non-latching relays, latching relays do NOT require power to keep their
contacts closed.
PX3TS outlet switching can be configured to operate as a true latching relay or
to simulate a non-latching relay. The operating mode determines the latching
relay behavior when PDU power is lost. Regardless of which mode is selected,
power is not required to keep relay contacts closed.
Non-Latching Mode:
•
Relay always opens when power is lost. This insures all relays are open
when power is applied to the PDU.
•
Always select this mode if the combined in-rush current of the devices
connected to the PDU trip circuit breakers when power is applied to the
PDU.
•
This is the factory default operating mode.
Latching Mode:
•
Relay does not open when power is lost.
•
This is the preferred operating mode ONLY if you are sure in-rush current
does not trip circuit breakers when power is applied to the PDU.
•
Power to the outlet is not disrupted if a PDU internal failure occurs.
•
In Latching mode, the following features are disabled.
▪
PDU-level outlet state on startup: See PDU (on page 206).
▪
Outlet-level outlet state on startup: See Individual Outlet Pages (on
page 232).
▪
PDU-level outlet initialization delay on startup: See PDU (on page 206).
Options for Outlet State on Startup
The following are available options for initial power states of outlets after
powering up the PX3TS 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 PX3TS was powered off.
If you are configuring an individual outlet on Individual Outlet Pages (on page
232), there is one more outlet state option.