18
SALICRU
Slot to insert one of the optional communication cards.
Remove the fixing screws and the plastic cover to allow its
inserting.
•
When finalising the connection tasks, the cover or
covers and their fixing screws will be put back be-
fore commissioning the equipment, in order to avoid acci-
dents due to direct contacts.
•
It is recommended the use of crimping pin terminal in all
the cable ends connected to terminals, in particular the
power ones (input, output and batteries).
•
Check the correct torque in the screws of the terminals.
5.2. CONNECTION.
•
The terminal protection cover leaves a slot for the cable
entering to the power terminal strip. The cover and/or en-
closure frame has drills that allows fixing the connection
cables in order to avoid unexpected cable pulling due to the
consequences that it could have.
5.2.1. Connection of the input terminals to AC power supply.
•
As this is an equipment with protection against elec-
trical shocks of class I, it is essential to connect the
main protective earth cable [
]. Connect this cable to the
terminal before supplying voltage to the input terminals.
•
Pay attention to the «Recommended installation» document
in section 5.1.5.4., which states the cross cable section,
protection size and features, etc, ...
«Backfeed protection» connection for TWIN PRO2.
(BP)
Automatic «Backfeed protection» system, external to the UPS (EN-IEC 62040-1).
(1)
General purpose fuse or fuses with size 600V AC and 1A of type F.
(2)
Two or four poles contactor of 400V AC with minimum distance among the contacts of 1.4 mm and230V ACcoil, with minimum current size of the stated one in
the UPS namopete .
(3)
Relay for power contactor power supply
(2)
, with 400V AC coil and NO contact type of 5A [1A minimum].
For parallel systems, each equipment must have its own "Backfeed protection" separately.
Conexión «Backfeed protection» para TWIN/3 PRO2.
R
N
(2)
Input
Output
UPS
U
N
(1)
(BP)
R
S
T
N
U
N
(BP)
(2)
(3)
Salida
Entrada
(1)
SAI
Fig. 16.
«
Backfeed protection
»
circuit diagram.
•
In accordance with the EN-IEC 62040-1 safety standard the
installation must have an automatic «Backfeed protection»
system, i.e.: a contactor, which prevents power supply or
dangerous energy at the UPS input during a power outage
[seer Fig. 16].
The standard applies to single or three phase input equip-
ments as well as both single units and UPSs in a parallel
systems.
•
Do not connect any line between the «Backfeed pro-
tection» and UPS, because the safety standard
would not be met.
•
Warning labelling must be placed in all the primary power
switches, installed far from the equipment, in order to warn
the electrical maintenance staff about the presence of a
UPS in the electrical circuit.
The labelling will include the following text or an equiva-
lent one:
Before operating in the circuit.
•
Isolate the Uninterruptible Power Supply
(UPS)
.
•
Check that the voltage among the terminals, PE
included.
Risk of UPS voltage backfeed.
•
Connect the input cables to the respective power terminal
strip depending on the available equipment [see Fig. 17].
For parallel systems, it will be needed to repeat the connec-
tions that go from the switchgear panel to each equipment.
Connection to a single phase input:
Connect the power supply cables to the R and N input ter-
minals,
by respecting the phase rotation of the neu-
tral and phase
stated in the labelling of the equipment
and this manual. Otherwise it can be damaged.
