34
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 For Europe, 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.
See FIG. 17, 18 for EPO location. FIG. 21 shows a schematic of the EPO connector
contacts.
FIG.21
EPO Connections
You can set the EPO polarity. See the“EPO Input Polarity”setting in“User Settings”.
NOTE Depending on user configuration, the pins must be shorted or opened to keep
the UPS running. To restart the UPS, reconnect (re-open) the EPO connector pins and
turn on the UPS manually. Maximum resistance in the shorted loop is 10 ohm.
NOTE Always test the EPO function before applying your critical load to avoid
accidental load loss.
EPO
