Control Cables; Monitor Board Features; Figure 6 Monitor Board U2 - Emerson Liebert NX 10-30kVA Installation Manual

Internal UPS Battery Connections
The UPS internal batteries will be connected at the factory, EXCEPT the Anderson connections
between the shelves and to the fuses.
WARNING
!
The DC bus is live when this internal battery connection is made. This connection is to be
performed ONLY by Liebert Global Services at startup.
Observe the battery cable polarity. Be sure that the battery connector is made with the cor-
rect polarity.
11. Refit all protective covers removed for cable installation
2.2

Control Cables

2.2.1

Monitor Board Features

Based on your site's specific needs, the UPS may require auxiliary connections to manage the battery
system (external battery circuit breaker, battery temperature sensor), communicate with a personal
computer or provide alarm signaling to external devices or for Remote Emergency Power Off (REPO).
The monitor board, arranged for this purpose, is located on the rear of the operator access door. The
main features are:
• Input and Output dry contacts signal (one pair of contacts of relay)
• Emergency Power Off control (EPO)
• Environmental parameter input interface
• User communication (for data setting and user background monitor)
• Intellislot™ interface
• Modem interface
• Temperature detect interface
Figure 6 shows the relationship and connection between the monitoring (U2) board and other boards
in the UPS.
Figure 6 Monitor board U2
Auxiliary Power
U1
DSP Control
M5
Monitor Board
User Interface
K1
Key & LED Board
U2
Parallel Logic
X1
Board
14
Electrical Connections
M3
Board