Salicru UPS SLC TWIN PRO series, User Manual, Page: 19 / 44

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SALICRU
of connection due to the function of the EPO button, because
it would not work in case of any of the two cables that goes
from the button to the UPS were cut (damaged).
On the other hand this failure would be immediately detected
in the normally closed EPO type, with the inconvenience of the
sudden break in the power supply to the loads, but with a com-
plete guarantee of the functioning of the emergency power off.
• To restore the normal operating mode of the UPS, the connector
with the cable bridge has to be fitted back in the terminal strip
or to deactivate the EPO button and later on to cancel the EPO
status in the control panel . The equipment will be operative.
5.3.7. Connection in parallel.
5.3.7.1. Introduction to the redundancy.
N+X is usually the most reliable power structure. N means the
minimum quantity of equipments that the total load needs; X
means the quantity of redundant equipments, so it means, the
quantity of faulty UPSs that the system can allow at the same
time. As higher is X, the highest will be the reliability of the
system. For those cases where the reliability is the most impor-
tant point, N+X will be the optimal mode.
Up to 4 equipments can be connected in parallel to set a share
and redundant output in power.
5.3.7.2. Installation and parallel operating.
• Communication line (COM) is a very low voltage circuit
of safety. To preserve the quality, it has to be installed
separate from other lines that have dangerous voltages (energy
distribution line).
• Parallel connection bus. Use the bundle with 25 signal ca-
bles with mesh and DB25 connectors in the ends to joint up
to 4 equipments as maximum. Each bundle has a male and
female connector in the ends, which have to be connected in
the correlative equipments. It is essential to close the loop of
the parallel bus.
The length of the parallel cable has 3 metres and it can't be
extended under any other concept due to the risk of interfer-
ences and communication failures that it could cause.
• In those installations with only one UPS, the “Jumper”
(cable as bridge mode) connected from factory be-
tween the terminals JP1 and JP2 has to be kept in this place.
For equipments connected in a parallel system, this “Jumper”
has to be removed.
Proceed according to your installation or otherwise the UPS
or parallel system will not work.
• The installation of the parallel systems, has to be provided
by a switchgear panel with individual protections for input,
output, static bypass (this last one for TWIN/3 PRO > 10 kVA
models only), also a manual bypass with mechanical lock,
see figures 12 and 13.
This switchgear panel allows isolating only one equipment
from the system, against any failure and feed the loads with
the rest of equipments during the preventive maintenance or
its fixing. In the same way, it allows removing an equipment in
parallel and replace it or put it in parallel again once it is fixed,
but without breaking the power supply to the loads.
Under request a manual Bypass panel can be supplied for a
single equipment or particular system.
• Regarding the protection panel, it is better to size it for future fore-
seen upgrading. This way, both the installation of any new UPS
in the parallel system is easier, and the risks due to electrical dis-
charge are minimized because the low voltage panel is manoeu-
vred for those cases that it is not possible to shutdown the loads.
• Respect the connection procedure for input and bypass
(TWIN/3 PRO > 10 kVA) described in the previous sections
of this chapter.
• • •
Input circuit breakers
Output circuit breakers
M
an
ual
B
yp
as
s
UPS nr 1 UPS nr 2
UPS nr
"N"
Input
To loads
• • •
Fig. 12. Parallel installation of TWIN PRO and TWIN/3 PRO UPSs
up to 10 kVA, with protection and manual bypass panel.
• • •
Input and bypass circuit breakers
Output circuit breakers
M
an
ual
B
yp
as
s
UPS nr 1 UPS nr 2
UPS nr
"N"
Input
To loads
• • •
Bypass line
Fig. 13. Parallel installation of TWIN/3 PRO series > 10 kVA,
with manual bypass and protection panel.