Riello UPS MASTER HE - Battery; Neutral Conductor

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 on the bypass line 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