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Commander UCP 5000 / 5100 Series
3.2.3 Clearing EPO Mode
After the EPO has been pressed, an operator has to clear the EPO mode before resuming normal operation with On mode.
Press the
EPO Reset
button. At this point, the system will be in Off mode with the pin connections reverted to the
conditions described in the sections above.
If the
Audio
button has been temporarily switch to the
Off
position, it should be switched back
On
so it can alert for the
next EPO event.
To return to normal operating mode with PDU outlets powered, press the
On
button.
3.3 Control Modes and PDU Behaviors
This section is to clarify what behavior to expect with various design options in the PDUs to which the Commander UCP
may be connected.
3.3.1 Optima 5 Series PDUs
In the various 5 Series PDUs with remote EPO capability (520, 532, 533), most of the outlets are subject to the EPO
control system, though some are always powered as long as the PDU itself is powered.
In 520 Series models, outlets labeled Group A are not subject to the EPO system. They will remain powered as long as the
PDU is powered. Outlet groups B and C are subject to EPO control.
In the 532 and 533 PDUs, a pair of outlets labeled J1 are not subject to the EPO system. All other outlets are.
The outlets in Group A or J1 will continue to be powered even when the EPO button is pressed or the EPO Mode switch on
the PDU is the Off (middle) position.
3.3.2 Optima 8 Series PDUs
In Optima 820 and 833 series PDUs, most outlets are subject to the EPO system. In the 820 models, outlet J9 is not
subject to the EPO system. In the 833 systems, the two highest numbered outlets (varies by model) are not subject to the
EPO system. They will remain powered as long as the PDU is powered, even if the EPO button is pressed.
With the addition of the remote control software, the Optima 8 series has an additional facet to consider when the EPO
state is activated.
By default, when an EPO event occurs, the Optima responds in two ways. First, the standard EPO control system in the
PDU shuts off the main power contactor or relay. This cuts power to all EPO controlled outlets. This action does not change
the state of the individual software-controlled outlet relays. Therefore, secondly, the RCM software is triggered to switch
all of its remote control outlet relays off.
When EPO is reset, and the Commander is restored to an on state, and the main power relay/contactor in the PDU is
turned back on. However, the RCM software, by default, assumes it’s own state erring on the side of safety, and the
individual remote control outlet relays remain off. An operator, or remote control script, has to restore the desired state of
each outlet.
Knowing that in some scenarios it is preferred to have the individual outlets restored to the power state they were in
before the EPO event, the RCM software has an option for this. In the Power view of the web interface, the Outlets tab has
an option labeled “Auto On When EPO Canceled” for each outlet. When this option is checked, that outlet will ignore the
original EPO event, and the remote control relay will not be switched off. There’s still no power at the outlet because the
main power relay/contactor will have cut the power source. With this option checked, when EPO is reset, power is restored
to the outlet because the individual outlet relay will still be in the on state.
There’s is more detail about this system in the RCM User Guide version 2.3.x Rev C and later.
