45
ENGLISH
MASTERYS BC
15-40 kVA - Ref.: IOMMASBCXX09-EN 01
10. ELECTRICAL OPTIONS
10.7-1
UPS 3/3 without separate auxiliary supply
10.7. PROTECTION ON A UPS WITHOUT AUXILARY MAINS SUPPLY
Activating UPS protection on the mimic panel: access the
UPS SETTING
menu on the mimic panel (see the
UPS SETTING
menu
under the
SERVICE
menu section of the manual) and set the
SET BACKFEED
parameter to
3.BYPASS-INPUT Common
.
Cable and trunk schematic
Note: The neutral is not disconnected as, even in the event of a single fault on the UPS, it never has high potential when the
mains and/or auxiliary power supplies are disconnected upstream. This is to prevent transformation of the power source to
the
UPS
every
time
there
is
a
power
failure.
Should the Neutral potential be very high due to certain error conditions or due to installations downstream (e.g. ground
fault not detected and protected, high dispersion of a phase, or the IT system), it will be necessary to install either devices
that disconnect the Neutral or alternatively a system that detects, signals and protects against high neutral/ground potential
which could lead to UPS failure.
Key
A
Distribution
panel
B
Remote coil switch
L1-L2-L3-N
Input power source
M1
Input power terminal board
Q1
Input power switch
T1
Remote
switch
1
XB1
Connector on BKF PCB
A
UPS
L1
Q1
L2
L3
N
T1
B
M1
L1
L2
L3
N
XB1
BKF card
1
Remote switches - rated current
Model
T1
15 3/1
32 A AC1
15 3/3
32 A AC1
20 3/1
45 A AC1
20 3/3
45 A AC1
30 3/3
60 A AC1
40 3/3
90 A AC1