IV404E Rev.000 SIEL S.p.A.
Issue date: 2017-06-05 Pag. 59 di 90 + FR
NOTE: “SWOUT ext”
must be provided with an auxiliary contact (open with the switch open and closed
with the switch closed).
Length of the cables
The sum of the lengths of the power supply and output cables must be the same for all units.
With reference to the drawing, these must be: a1+c1 = a2+c2 = a3+c3
a = length of input line cables
b = length of output line cables
The same rule must also be observed with separate power lines: the lengths of the cables of
the by-pass line + output line must be the same between all the SAFEPOWER EVO HFT
connected in parallel.
Lack of compliance with this rule may cause a current imbalance between the UPSs when the
load is powered through the by-pass line.
An overload on the by-pass line of one UPS will lead to a deterioration of the components on
that line, both internal and external to the UPS: that is, the disconnector cables and electronic
power components.
