NOTE:
Before installing the connectivity card, please remove the clip from the bay.
Emergency Power-off
EPO is used to shut down the UPS from a distance. This feature can be used for shutting down
the load and the UPS by thermal relay, for instance in the event of room over temperature.
When EPO is activated, the UPS shuts down the output and all its power converters
immediately. The UPS remains on to alarm the fault.
There is also a front panel EPO option for user to initial EPO function by pressing the three
switches on the front panel together. When the three switches are pressed down at the same
time, the EPO function will be active, UPS will shutdown and the UPS will long beep. Pressing
startup switches will not turn on the UPS unless the EPO function is deactivated by pressing
the three switches together and press off switches to return normal status.
WARNING
The EPO circuit is an IEC 60950 safety extra low voltage (SELV) circuit. This circuit must be
separated from any hazardous voltage circuits by reinforced insulation.
CAUTION
●
The EPO must not be connected to any utility connected circuits. Reinforced insulation to
the utility is required. The EPO switch must have a minimum rating of 24 Vdc and 20 mA
and be a dedicated latching-type switch not tied into another circuit. The EPO signal must
remain active for at least 250 ms for proper operation.
●
To ensure the UPS stops supplying power to the load during any mode of operation, the
input power must be disconnected from the UPS when the emergency power-off function
is activated.
NOTE
The emergency switch requirements are detailed in Harmonized document HD-384-48
S1, “Electrical Installation of the Buildings, Part 4: Protection for Safety Chapter 46: Isolation
and Switching.”
EPO Connections
Wire Function
Terminal Wire Size Rating
Suggested Wire Size
EPO L1
4–0.32 mm2 (12–22 AWG)
0.82 mm2 (18 AWG)
L2
NOTE
Leave the EPO connector installed onto the EPO port of the UPS even if the EPO function
is not needed.
