External Control Connections; Emergency Power Off (Epo) - Eaton Powerware 9155 UPS20-30kVA User Manual

External control connections
The UPS has an input/output interface for direct communication with your computer system. It
is located behind the front door of the UPS unit. The cables connected to these terminals should
be connected to cable clips.
Input and output terminals have a functional isolation from terminal to terminal. They are
connected to the chassis through individual 1 MΩ resistors.
Figure 11 External control cable connections to the UPS.
Note!
Pay attention to proper polarity if one is using a semiconductor switch type. A relay
or other maintenance control is a preferred method.
Emergency Power Off (EPO)
This input is used to shut down the UPS from a distance. This feature can be used for
emergency power down. There are two modes of operation, normally closed at X2 and
normally open at X12. Remote shut down terminal X2 pins 1 and 2 are as factory default linked
(X12 is open). When the loop on X2 is opened, the logic circuitry will immediately shut down
the UPS output and open the battery breaker (F1).
Note!
EPO does not necessarily disconnect supply to load when unit is on internal or
external bypass. Quaranteed disconnection of bypass supply has to be through a
separate disconnect switch located in the supplying switchgear cabinet.
24 UPS 20-30 kVA, 230 V 0/60 Hz output
User's Guide
1026743
Revision B