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OPM_SGS_ISG_10K_40K_0US_V010.doc
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Installation
Guide
SG Series
10, 20, 30 & 40 kVA
SGT5
000_
030
-04
0_RPA cont
ro
l bu
s c
a
bl
e_
02
US
Next parallel
unit 3, 4, 5, 6, 7, 8
JB2
JA2
UPS 1
JA1
JB1
JA1
JB1
JB
JA
JB1
JB2
JB
JA
JA2
JA1
JA2
UPS 2
Q2
Q1
OFF
ON
O FF
ON
JB2
A
A
ON
O FF
Q1
Q2
O N
OF F
Fig. 3.11-3 Control Bus cable routing and connection
Control bus cables routing
Place and fix the cables
JA-1/2/3/4/5/6/7
and
JB-1/2/3/4/5/6/7
with the appropriate clamps
inside the UPS cabinets in the position shown in the drawing Fig 3.11-1/2/3.
Pay attention to the fact, that routing of cables shall allow the removal of the protection covers
“
A
”
.
Pay attention when cabling and routing the bus cables
JA
and
JB
inside the
UPS cabinet.
In case one unit should be removed from the parallel system, the bus cables
JA
and
JB
must be removed from the cabinet without disconnecting them
from the metal plate where the sockets
JA
and
JB
are located
.
For reliability reasons the cables
JA-1/2/3/4/5/6/7
and
JB-1/2/3/4/5/6/7
connecting the units
should be run in separated protected conduits (as indicated in fig. 3.11-3) separated from the
power cables.
It is important that the cable
JA
must be the same length as cable
JB
.
The connection of the control bus cable in a UPS system already powered
requires a special reset operation, which can be made by only a trained
operator.