Salicru UPS SLC TWIN PRO series User Manual - page 16
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tion and neutral stated in the labelling of the equipment and
in this manual. If this rotation is not respected, the equipment
will not work. A wrong connection between the neutral and
one phase will make serious or very serious faults.
When discrepancies exist between the labelling and the in-
structions of this manual, the labelling will always prevail.
•
In parallel systems, the length and cross section of the
cables that go from the switchgear panel till one of the
UPSs and vice versa, will be the same for all of them without
any exception.
5.3.2. Connection and power supply the
separate static bypass line (remove
the bridge between R (M2) and
(JP)). TWIN/3 PRO > 10 kVA only.
•
As this is a device with class I protection against electric
shocks, it is essential to install a protective earth conductor
(connect earth(
)). Connect the conductor to the terminal, be-
fore connecting the power supply to the input power block.
R
N
R
S
T
N
R
N
U
N
(BP)
(2)
(1)
UPS
«Backfeed protection» connection in TWIN/3 PRO > 10 kVA
with separate bypass line
B
ac
kfe
ed
pr
ot
ec
tion
si
gnal
«Backfeed protection» connection in TWIN PRO.
(2)
In
pu
t
O
ut
pu
t
O
ut
pu
t
In
pu
t
B
ypa
ss
(BP) Automatic «Backfeed protection» protection system, external to the UPS (EN-IEC 62040-1).
(1)
Fuse or fuses of general purpose of 600V AC and 1A with F characteristic.
(2)
Two or four poles contactor of 400V AC with a minimum distance between the contacts of 1,4 mm and coil of 230V AC. Its nominal current must
be at least of the one stated in the UPS nameplate (input or bypass depending on the model).
(3)
Relay to supply the power contactor (2), with 400V AC coil and (NO) contact of 5A (1A at least).
(4)
Cable installed from factory as a bridge mode in any TWIN/3 PRO > 10 kVA equipment. Remove this cable fitted in as a bridge mode between
the terminals R (M2) and (JP), when separate bypass line terminals is needed only.
For parallel systems, each equipment must have its own "Backfeed protection" completely independent.
MC/
coil. out
MC/
coil. in
R
S
T
N
U
N
(BP)
(2)
(3)
«Backfeed protection» connection in TWIN/3 PRO up to 10 kVA.
O
ut
pu
t
In
pu
t
R
S
T
N
R (M2)
N
JP
U
N
(BP)
(1)
(2)
«Backfeed protection» connection in TWIN/3 PRO > 10 kVA.
B
ac
kfe
ed
pr
ot
ec
tion
si
gnal
O
ut
pu
t
In
pu
t
MC/
coil. out
MC/
coil. in
UPS
UPS
UPS
(1)
U
N
(1)
(BP)
(4)
Fig. 10.
“Backfeed protection” circuit diagram.
•
To operate with separate bypass line, it is compulsory
to remove the cable bridge installed from factory be-
tween the terminals R (M2) and (JP).
• In accordance with safety standard EN-IEC 62040-1, the in-
stallation has to be provided with a «Backfeed protection»
system, as for example a contactor, which will prevent the
appearance of voltage or dangerous energy at the bypass
line during a mains fault (see Fig. 10) and respect the cir-
cuit diagram of the particular «Backfeed protection» for the
equipment available.
There can be no derivation in the line that goes from
the «Backfeed protection» to the UPS, as the
standard safety would be infringed.
• The control signal of the external contactor for «Backfeed
protection» is done through the terminals of the own UPS
(MC/coil. out and MC/coil. in).
Operating:
If bypass thyristor is short-circuited and the UPS is working
on double conversion mode (On-Line), the «Backfeed pro-
tection» contactor will break the bypass line and the mes-
sage «Backfeeder» will be displayed in the LCD panel.
Reset.
USER MANUAL