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KESS Power Solutions Gmbh / www.kess.at / info@kess.at
when installing systems in parallel, it is
necessary to provide them with a box
equipped with individual input and output
protections, as well as a manual bypass
with mechanical locking, see fig. 15.
in case of a disruption this fuse boxes
enable to isolate a single device in the
system and to power the loads with the
remaining devices during preventive
maintenance or repair.
it also allows the removal of a parallel
device and its reintegration once it is
repaired, without interrupting the powering
of the loads at any time. Provided that the
power of the operational device permits it.
on request, we can supply a manual
bypass box for a system in parallel with two
devices.
input
UPS Nr. 1
UPS Nr. 3
output circuit breaker
input circuit breaker
To the loads
manual bypass
fig.15: Parallel installation of two UPS systems from
4 to 6 kVA with fuse box and manual bypass
Mind the connection procedure for the input as described in paragraph 6.4.
Mind the connection procedure for the output (loads) as described in
paragraph 6.5.
Mind the connection procedure as described in paragraph 6.8.
in parallel systems, the length and cross section of the cables that lead from the
fuse box to each UPS and from the UPS to the box will be the same for all cables
without exception.
in the worst case, the following instruction must be strictly observed:
•
when the distance between the UPS in parallel and the circuit breaker board
is less than 20 metres, the difference in length between the input and output
cables of the device must be less than 20%.
•
when the distance between the UPS in parallel and the the circuit breaker
board is more than 20 metres, the difference in length between the input and
output cables of the device must be less than 10%.