G-Tec LibraPro, User Manual

Page: 14 / 57

Pag. 14 / 57 0MNLIBRAPROK10NPENUA 01
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 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 65Ah: 125A type gl/gG or 180A type aR.
For the section of the cable for the UPS to battery connection refer to the following current value:
3.1.4 Differential (RCD)
If the LIBRAPRO protection against electric shock uses differential current devices (RCD), these have to have the
following characteristics:
- Sensitivity 300mA
-
sensitive direct current and unidirectional components (class B)
- insensitive to transient current pulses
- delay greater than or equal to 0.1 s.
In the standard version (SWBY close), without an input separation transformer, the neutral originating from the
mains is connected to the UPS output neutral. The system neutral point treatment is not modified:
THE INPUT NEUTRAL IS CONNECTED TO THE OUTPUT NEUTRAL
THE DISTRIBUTION SYSTEM WHICH POWERS THE UPS IS NOT MODIFIED BY THE UPS
neutral
The neutral point treatment is only modified if a barrier is present or when the UPS operates with the
neutral isolated upstream (SWBY open)
When operating in the presence of mains supply, a differential breaker (RCD) installed on the input will intervene as
the output circuit is not isolated (with SWBY close)from the input circuit.
When operating without mains supply (from battery with SWBY) the input differential breaker will intervene only if
it is able to switch as a result of leakage current without any voltage at its poles (for example a differential breaker
with an auxiliary relay is not suitable). However it is possible to install additional differential breakers on the output
of the UPS, possibly coordinated with those on the input.
[kVA] 10 15 20 30 40 60 80
battery
Permanent battery eq. Current [A] 25 38 50 80 109 168 225