Installation manual

Section 400: Additional Requirements

NOTE: The remote Emergency Power Off (EPO) switch and service panel warning label described

below are required to meet TÜV, per EN 50091-1 and EN 60-950.

• Remote Emergency Power Off (EPO) - The EPO switch is a requirement for most 50 Hz installa-

tions (see the NOTE above). The UPS must have a remote Emergency Power Off (EPO) switch

which can shut off the UPS output in an emergency, de-energizing the loads. The EPO switch must

have a set of dedicated contacts that can short pin 7 to pin 4 on the UPS DB9S communication port.

To activate an EPO shutdown, short pin 7 to pin 4 (see Figure 10). To reset the UPS after an EPO

shutdown, use the EPO reset button located inside the unit’s front door. See the Appendix of the

UNITY

/I User Manual for more information.

Figure 10: Remote Emergency Power Off (EPO) Switch

• Service Panel Warning Label - A warning label like the one shown in Figure 11 has been supplied

with your installation manual. For most 50 Hz installations (see the NOTE above), you must place

the warning isolation label next to the input circuit supplying power to the UPS. It should be seen on

the building service panel. This label is necessary for units without automatic backfeed isolation. It

warns electricians that the circuit feeds a UPS remote from the area.

Figure 11: Service Panel Warning Label

WARNING: ISOLATE UNINTERRUPTIBLE POWER SUPPLY

(UPS) BEFORE WORKING ON THIS CIRCUIT.