Liebert NX User Manual

Electrical Connections
18 Liebert
®
NX
™
3.2 Control Cables
3.2.1 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)
• Liebert IntelliSlot
®
interface
• Modem interface
• Temperature detect interface
Figure 4 shows the relationship and connection between the monitoring (U2) board and other boards
in the UPS.
Figure 4 Monitor board U2
X1
User Interface
Board
U1
DSP Control
K1
Key & LED Board
U2
Monitor Board
M3
Parallel Logic
Board
M5
Auxiliary Power

Liebert NX Specifications

General

Frequency	50/60 Hz
Topology	Double Conversion/Online
Input Voltage	208, 220, 240 VAC
Output Voltage	208, 220, 240 VAC
Battery Type	VRLA
Operating Temperature	0 to 40°C (32 to 104°F)
Humidity Range	0 to 95% (non-condensing)