Emerson Liebert NX 50 and 60 Hz - Manual (Page 65)

External Optional Cabinets
53
EXT-Maint X3-1&2 on UPS Parallel Board M3 (leave open if no external bypass switch is used). Pro-
vides external maintenance bypass interlock protection for the UPS. Short circuit means external
bypass closed.
EXT-Out (X3-3&4) on UPS Parallel Board (leave shorted if no external output switch is used). Pro-
vides external output interlock protection for paralleled UPS modules. Short circuit means external
output switch closed.
4.3 Isolation Transformer Option
Isolation transformers are required in cases requiring galvanic isolation between the input supply
mains and the UPS.
These options are housed in cabinets and they are available for every range of UPS.
These optional cabinets provide the Top Cable entry function.
Figure 36 Equipment arrangement—UPS, battery cabinet and top-entry Isolation Transformer Cabinet
Figure 37 Single input external isolation transformer cabinet
NOTE
Terminals and cabling for the battery connection is not a part of the MBP or TC cabinet.
TCE
TX UPS
BATTERY
cabinet
FRONT
Q1
Q3
Q5
X3
X1
CB
To Load
UPS
N
Bypass
Supply
Input Mains Supply
3P
Supplied by
Others
Isolation Transformer Cabinets
T1
QF1
Q2