Riello UPS MASTER HE, User Manual

Page: 14 / 57

pag. 14 / 57 0MNMHEM30RUENUB 00
3.1.3 Battery
BATTERY CABINET
For connection to the UPS, the battery cabinet must have an overcurrent protection device and a
disconnecting device which ensure the disconnection of both the polarites
The disconnector may be closed
only when the UPS is started up regularly; see the section “Start-up
procedure” on page 26.
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 t he b yp a s s l i ne is required should it be necessary to modify the
neutral arrangements downstream of UPS.
300-400kVA
In normal operation SWBY and SWOUT switches are closed, the opening of the SWBY do not change the state of
the neutral output system
300-400kVA
The neutral state is not a function of position of the bypass line switch.
[kVA] 300 400 500 600 800
Battery
refer to the
“INSTALLATION DRAWINGS”
Permanent battery eq. Current [A]
L2
L1
N
L3
L3
L1
L2
L2
L3
L1
Static
Switch
SWMB
SWBY
SWOUT
PE
L1
L2
L2
L1
N
L3
L3
PE
PE
(*)
UPS