25
4.3.7. "Dry_in" terminals, remote on-oFF (0,7
to 3 kVA equipments only)
• The equipments from 0,7 to 3 kVA have a 4 pins connector, two
for the EPo (see the description in the previous section) and two
for remote start up or shutdown "Dry_in".
• Through these terminals, an external button can be connected,
with the same function that the own in the UPS.
• when pressing, over it for 1 second, the circuit will activate the
opposite order of the current status of the inverter, so, if it is shut-
down then it will be started up and vice versa, if the inverter is
started up then it will be shutdown (see figure 14).
External button, normally open.
it is activated with an order of 1
second pulsation.
1
4
+ VDC
EPo
Dry_in
Fig. 14. button installation in the "Dry_in" terminals.
4.3.8. "Dry_out" terminals, dry contact for
alarm (0,7 to 3 kVA equipments only)
• The equipments from 0,7 to 3 kVA are supplied with a normally
open dry contact "Dry_out", which is closed when activating of
any one or more associated alarms "Summary Alarm" from Table
4.
•
Do not apply more than 30V AC 1A or 60V DC 2A. Dry
contact, do not connect both phases between the con-
tacts, because there would be a short-circuit when triggering the
alarm because the circuit is closed.
1
2
4
3
Dry contact, do not apply voltage
Fig. 15. Dry contact "Dry_out".
bUS over Voltage
inv Under Voltage
bUS Under Voltage
inv Softstart Fail
bUS Unbalance
output overload
bUS Short
inv overload Fault
bUS Softstart Fail
byp overload Fault
output Short Circuit
Heatsink over temperature
inv over Voltage
-
Tab. 2.
Associated alarms to "Summary alarm" for Dry_out contact.
4.3.9. Connection in parallel
4.3.9.1. introduction to the redundancy
n+1 is usually a reliable power structure. n means the minimum quan-
tity of equipments that the total load needs, so 1, and 1 means the quan-
tity of redundant equipments, so it means, the quantity of faulty UPSs
that the system can allow at the same time.
KESSUPS 91RT series allows two equipment connected in parallel
only, for those models with power rate between 4 and 10 kVA, in
order to set a shared output and redundant in power.
4.3.9.2. installation and parallel operating (4 to 10 kVA
equipments only)
•
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 15 signal cables with
mesh and HD15 connectors in the ends to joint up to 2 equip-
ments as maximum. Each bundle has a male and female con-
nector in the ends, which will have to be connected to joint both
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 ex-
tended under any other concept due to the risk of interferences
and communication failures that it could cause.
• The installation of the parallel systems, has to be provided by a
switchgear panel with individual protections for input, output
and static bypass (this last one, in those installations that uses the
second line only), also a manual bypass with mechanical lock, see
figures 16 and 17.
This switchgear panel allows isolating only one equipment from the
system, against any failure and feed the loads with the rest of equip-
ments 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 meanwhile the connected power can be sup-
ported by the operative equipment.
Under request a manual bypass panel can be supplied for a single
equipment or a system of two equipments in parallel.
• Respect the connection procedure for input and bypass described
in the previous sections of this chapter.
• Respect the established procedure to make the connection of the
battery modules for those equipments with extended back up
time, which has been described in the previous sections of this
chapter.
• Respect the established procedure to make the connection of the
output (loads), which has been described in the previous sections
of this chapter.
• Respect the established procedure to make the connection of the
output and batteries of the equipment, which has been described
in the previous sections of this chapter.
•
in parallel systems, the length and cross section of the ca-
bles that go from the switchgear panel till one of the UPSs
and vice versa, will be the same for all of them without any excep-
tion.
