23
•
in equipments with separate bypass line, a galvanic isola-
tion transformer has to be installed in any of the two lines
that supply the UPS (rectifier input or static bypass), to avoid the
direct union of the neutral of both lines through the internal
wiring of the equipment.
This is applicable when the two lines are supplied from different
mains, i.e.:
Two different electrical companies.
An electrical company and genset, ...
Cable as bridge
mode "Jumper"
factory installed
default
UPS KESSUPS 91RT > 3 kVA with no bypass line.
UPS KESSUPS 91RT > 3 kVA with bypass line.
Frequency converter KESSUPS 91RT > 3 kVA.
Fig. 13. Power block connection depending on the equip-
ment.
4.3.3. Connection of the iEC outlets and output
power blocks
•
As this is a device with class i protection against electric
shocks, it is essential to install a protective earth con-
ductor (connect earth(
)). Connect the conductor to the ter-
minal, before connecting the power supply to the input power
block.
• All the equipments have female iEC outlets, in greater or lesser num-
bers depending on the power rate of the equipment:
Models up to 2 kVA: 2 groups of 4 iEC outlets of 10A labelled as
lS1 and lS2, which can be set through the control panel and/or
win Power.
Models of 3 kVA: 2 groups of 4 iEC outlets of 10A labelled as lS1
and lS2, which can be set through the control panel and/or win
Power, plus a iEC connector of 16A.
Models from 4 to 6 kVA: 2 groups based on 2 iEC outlets of 10A
and 1 of 16A each one.
Each group has an automatic protection switch. in case of
tripping, the load connected to the respective outlet has to
be checked, otherwise the protection will be activated and
deactivated cyclically, and therefore the loads will suffer the
consequences.
Models of 8 and 10 kVA: 4 groups based on 2 iEC outlets of 16A
each one.
Each group has an automatic protection switch. in case of
tripping, the load connected to the respective outlet has to
be checked, otherwise the protection will be activated and
deactivated cyclically, and therefore the loads will suffer the
consequences.
• For hardwired equipments (models from 4 to 10 kVA).
Connect the loads to output power block l and n, by re-
specting the phase and neutral rotation stated in the label-
ling of the equipment and this manual (see figure 13).
when discrepancies exist between the labelling and the in-
structions of this manual, the labelling will always prevail.
loads can be connected to the iEC outlets, to the
output power blocks or to both at the same time,
meanwhile the features of the equipment and iEC outlets
limitations are not exceeded, otherwise there will be sudden
blackouts in the power supply of the connected loads at the
output.
• if besides of the critical loads, it is required to connect lagging
loads of high consumption, like laser printers or CRT monitors,
the inrush currents of these peripherals will be kept in mind in
order to avoid blocking the equipment under the worst condi-
tions.
it is better to not connect the loads of this kind, due to the high
quantity of energy resources that are taken from the UPS.
•
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.
• with respect to the protection that must be placed at the output
of the UPS, we recommend that the output power should be
distributed in at least four lines. Each one should have a circuit
breaker protection switch of a value of one quarter of the nom-
inal power. This type of power distribution will allow that in the
event of a breakdown in any of the machines connected to the
device causing a short-circuit, it will affect to no more than the
line that is faulty.
The rest of the connected loads will have their continuity as-
sured due to the triggering of the protection, because the line
affected by the short-circuit will trip its protection.