Vertiv Liebert APM Plus - Remote EPO

8.2.6 Remote EPO
In addition to the EPO switch provided on the touch screen of each UPS module for controlling the EPO of each module
respectively, the parallel system also provides remote EPO function for controlling all UPS modules to shut down
simultaneously from a remote terminal, as shown in Figure 8.4 below.
N O T E: The rem ote EP O sw itch m ust provide dry contact sign al, wh ich is norm ally open or norm ally
closed.
N O T E: The open circu it voltage provided is 12 V dc, < 20 m A .
N O T E: The external EPO d evice is com posed to configure another control system w h ich can
disconnect UPS m ains su pp ly or b ypass input.
N O T E: Pins 1 and 2 of the norm ally closed EPO -J5 port on the bypass module have b een linked in
factory.
Figure 8.4 EPO circuit diagram
N O T E: In F igu re 8.4 above, the up per one is Norm ally Op en type, an d the low er one is Norm ally
Closed typ e.
8 Parallel System and LBS System
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Vertiv™ Liebert® APM Plus User Manual