Emerson Liebert NX 10-30kVA - Manual (Page 88)

Operating Instructions
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9.9 Battery Protection
9.9.1 Battery Undervoltage Pre-Warning
Before the end of discharge, the NX displays a battery undervoltage pre-warning. After this pre-warn-
ing, the battery has the capacity for 5 minutes discharging with full load (default time). The NX can
be user-configured to display this warning from 3 to 60 minutes before end-of-discharge.
9.9.2 Battery End-of-Discharge (EOD) Protection
If the battery voltage is lower than the end-of-discharge voltage, the battery converter will be shut
down.
9.9.3 Battery Fuse-Blow Warning
Battery current protection is provided by the battery fuses FU7 and FU8. If a battery fuse blows, the
NX displays the battery fuse-blow warning and the battery converter will be shut down.
9.10 Isolating and Integrating One Module in a Multi-Module System
1. Turn Off inverter
2. Open External Output CB1
The UPS enters Isolation Status automatically, parallel signaling and communication becomes
masked, and output becomes inhabited.
3. Power Off unit for maintenance.
4. Power On unit with External Output CB1 open.
5. Unit enters Test Mode by configuration software setting.
6. Diagonosis or testing.
7. The UPS exits Test Mode by configuration software setting.
Output becomes inhibited because of Isolation Status.
8. Return all switches to the Normal position, including External Output Circuit Breaker 1.
9. Close External Output Circuit Breaker 1.
The UPS exits Isolation Status automatically, parallel signaling and communication recovers,
output becomes enabled but interlocking works now.
10. Turn On inverter and join the parallel system.
NOTE
All equipment servicing procedures must be carried out only by trained personnel.
!
WARNING
Hazardous Battery Voltage
No operator serviceable parts are located behind covers that require a tool for their removal.
Only qualified service personnel are authorised to remove such covers.
The UPS battery and connecting terminals remains energized at hazardous voltage levels at
all times. The battery is located behind protective covers that require a tool for their removal:
inside the UPS cabinet, inside a free-standing battery cabinet or on open racks inside a
dedicated battery room that may be locked.