IV404E Rev.000 SIEL S.p.A.
Issue date: 2017-06-05 Pag. 56 di 90 + FR
4.2.3 Emergency power off device (EPO)
When several devices are connected in parallel, the EPO command must be sent to
all UPSs simultaneously, as shown in the figure below:
a - EPO terminal board on the UPS
b- EPO switch with auxiliary contacts (not provided).
The button must have the same number of auxiliary contacts as the number of parallel UPSs. Each UPS
must have the jumper on the EPO terminals (page 29 ) removed and the wires from the auxiliary contact of
the button must be connected instead of the jumper.
The contact must be closed with the button in the rest position and be opened when the button is pressed.
The connection must be made with the UPSs switched off.
UPS 1
a
UPS 2
a
UPS 8
a
b
