Liebert NX UPS, 40-200kVA. The Liebert NX is a true on-line, double conversion, three-phase UPS system with Softscale™ technology that provides a scalable solution for growing data centers. The UPS allows growth from 40 to 60 to 80 kVA, and from 80 to 100 to 120 kVA. The UPS may also be paralleled for additional capacity or for redundant. Liebert NX (10-30kVA) Liebert NX is a mid-sized, three-phase uninterruptible power supply (UPS) system that delivers complete, centralized data center power protection. Designed to meet the high availability power needs of a wide variety of IT applications and equipment, the UPS combines compact size, advanced operating features and low cost of. Liebert NX is a mid-sized, three-phase uninterruptible power supply (UPS) system that delivers complete, centralized data center power protection.
Emerson 10-30KVA User Manual. Download 3.14 Mb. For Business-Critical Continuity. The Liebert NX™ UPS is designed primarily for telecommunications and data processing applications. Liebert Corporation neither recommends nor knowingly sells this product for use with life support and other designated “critical” devices. Emerson Liebert NX 30 kVA Pdf User Manuals. View online or download Emerson Liebert NX 30 kVA User Manual.
Operation
59
Normal Mode
Operating in normal mode, the NX’s rectifier derives power from a utility AC source and supplies reg-
ulated DC power to the inverter, which regenerates precise AC power to supply the connected equip-
ment. The rectifier also uses the utility source power to charge the batteries.
Battery Mode
When utility AC power fails, the NX protects the critical load by instantaneously channeling battery
power to the inverter which continues supporting the critical load without interruption. When utility
power returns and is within acceptable limits, the NX automatically shifts back to Normal mode, with
the rectifier powering the critical load.
Bypass Mode
When the NX is in bypass mode, the load is directly supported by utility power and is without battery
backup protection.
The NX’s static transfer switch will shift the load from the inverter to bypass mode without an inter-
ruption in AC power if the inverter is synchronous with the bypass and any of the following occurs:
• inverter fails
• inverter overload capacity is exceeded
• inverter is manually turned off by user
Maintenance Mode
For maintenance or repair, the NX may be operated in maintenance mode. To place the NX in mainte-
nance mode, the load must be transferred to bypass and the inverter must be turned off. When those
conditions are met, the rotary switch may be turned to MAINT and the UPS may be shut down, per-
mitting disconnecting the batteries for maintenance.
Parallel Redundancy Mode (System Expansion)
For higher capacity, higher reliability or both, the outputs of up to four UPS modules can be pro-
grammed for directly paralleling while a built-in parallel controller in each UPS ensures automatic
load sharing.
Frequency Converter Mode
The Liebert NX can be programmed into frequency converter mode for either 50Hz or 60Hz stable
output frequency. The input frequency may vary from 40Hz to 70Hz. In this mode, the static bypass
operation is disabled and the battery becomes optional, depending on any requirement to operate in
battery mode (stored energy mode).
NOTE
If the inverter is asynchronous with the bypass, the static switch will transfer the load from the
inverter to the bypass WITH interruption in AC power to the critical load. This interruption
will be less than 15ms (in 50Hz), or less than 13.33ms (in 60Hz). This interruption time may be
altered by modifying the Output transfer interrupt time setting.
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CAUTION
The internal maintenance bypass must not be used when the UPS system is in 1+N parallel.
!
WARNING
The UPS input and output must be protected with external overcurrent protection devices. In
maintenance mode, the input and output busbars remain energized.
UPS Status Messages
100
DC Bus Overvoltage
Rectifier, inverter and battery converter were shutdown because DC bus voltage is too high.
Check whether there is a fault in rectifier side. If no, then check whether overload occurs.
Restart the inverter after resetting the fault. If fault does not clear, contact Liebert Global Services
at 800-543-2378 for assistance.
Parallel Connect Fault
The parallel cables are not connected correctly in a parallel system.
1. Reset the fault by pressing the 'fault clear' button, then restart the inverter by pressing the
'inverter on' button.
2. If the UPS does not resume normal operation, contact Liebert Global Services at
800-543-2378 for assistance.
Bypass Overcurrent
Bypass current is over limit above 135% rating. The UPS just alarms and does nothing.
Refer to
your installation documentation or
contact Liebert Global Services at 800-543-2378 for
assistance.
LBS Active
The LBS setting is active. The UPS is acting as an LBS master or slave in a dual bus
configuration.
Battery ground fault
Battery ground fault from dry contact signal. Contact Liebert Global Services at 800-543-2378 for
assistance.
Inverter turned On
manually
Manual Turn On via front panel
Inverter turned Off
manually
Manual Turn Off via front panel
EPO
Emergency Power Off
Transfer Confirm
Interrupted Transfer Confirm
Transfer Cancel
Interrupted Transfer is cancel
Unit Off Confirm
Unit Turned Off Confirm
System Off Confirm
Parallel System Turned Off Confirm
Fault Reset
Fault Rest
Alarm Silence
Alarm Silence
Turn On Fail
Turn On Fail
Alarm Reset
Audible Alarm Reset
Bypass Mode
UPS in Bypass Mode
Normal Mode
UPS in Normal Mode
Battery Mode
UPS in Battery Mode
Joint Mode
UPS in Inverter Mode
UPS Shutdown
UPS Shutdown, output power-down
Output Disabled
UPS Output Disabled
Generator Connected
Generator is connected and a signal is sent to UPS
Input Disconnect Open
Input Disconnect Open
Input Disconnect Closed
Input Disconnect Closed
Maint. Disconnect Open
Maintenance Disconnect Open
Maint. Disconnect Closed
Maintenance Disconnect Closed
Reserved
Rotary Sw. Test Pos.
Rotary switch is in test position.
Rotary Sw. Normal Pos.
Rotary switch is in normal position.
Rotary Sw. Bypass Pos.
Rotary switch is in bypass position.
Rotary Sw. Maint. Pos.
Rotary switch is in maintenance position.
Bypass Disconnect Open
Bypass Disconnect Open
Bypass Disconnect Closed Bypass Disconnect Closed
Output Disconnect Open
Output Disconnect Open
Output Disconnect Closed Output Disconnect Closed
Table 44
UPS status messages (continued)
Event Message
Description / Suggested Action (if any)