IV404E Rev.000 SIEL S.p.A.
Issue date: 2017-06-05 Pag. 20 di 90 + FR
3.1.3 Battery
Battery cabinet
For connection to the UPS, the battery cabinet must have an overcurrent protection device and
a disconnecting device.
The disconnector may be closed
only when
the UPS is started up regularly; see the section
“Start
-
up procedure” on page
38.
The function of the fuses is to protect the batteries and the cables from a shortcircuit between the battery
cabinet and the UPS. The following rules should be observed for their sizing:
if rapid fuses of the type gl / gG are installed
: the maximum size of fuse to be used is 2
times the battery capacity in Ah.
If ultra rapid fuses of the type aR are installed
: the maximum size of fuse to be used is 2.5
times the battery capacity in Ah.
For example: the following fuses may be used for batteries of the type 150Ah: 315A type gl/gG or 355A
type aR.
For the section of the cable for the UPS to battery connection refer to the following current value:
3.1.4 neutral conductor
Do not connect the output neutral to ground.
The use of an isolation transformer o n the bypass line is required should it be necessary
to modify the neutral arrangements downstream of UPS.
[kVA]
300
400
500
600
Battery
Permanent battery eq. Current
[A]
675
900
1150
1300
