9.7Battery Protection

Operating Instructions

9.7.1Battery Undervoltage Pre-Warning

Before the end of discharge, the Liebert NX displays a Low Battery pre-warning. After this pre-warn- ing, the battery has the capacity for 5 minutes discharging with full load (default time). The Liebert NX can be user-configured to display this warning from 3 to 60 minutes before end-of-discharge.

9.7.2Battery End-of-Discharge (EOD) Protection

If the battery voltage is lower than the end-of-discharge voltage, the battery converter will be shut down.

9.8Multi-Module System Procedures

9.8.1Isolating One Module in a Multi-Module System

1.Turn Off the inverter

2.Open External Output CB4 in Parallel Cabinet (see Figure 60).

The UPS enters Isolation Status automatically, parallel signaling and communication become masked and output becomes inhibited.

3.Power Off the unit for maintenance.

4.Power On the unit.

5.Unit enters Test Mode by configuration software setting.

6.Diagnosis 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.

9.Close External Output CB4 in Parallel Cabinet (see Figure 60).

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.

Figure 60 Typical parallel system block diagram with common input supply, with separate batteries and optional output / bypass distribution panel

480V, 3W

System Input

MBB

RIB = Rectifier Input

Breaker

IOB = Inverter Output

Breaker

MBB = Maintenance

Bypass Breaker

MIB = Maintenance

Isolation Breaker

LDB = Load Distribution

Breaker

	Liebert NX UPS (40-200kVA)
		Bypass
		Static
		Switch
RIB 1	AC	DC
RIB 1
	DC	AC

480V DC

Battery Input

RIB 2 UPS Module 2

RIB 3 UPS Module 3

RIB 4 UPS Module 4

MIB

IOB 1

IOB 2

IOB 3

IOB 4

480V, 3W Output

LDB 1

User Supplied

Plug-In Output

Breakers

480V, 3W Output

LDB N

NOTE

All equipment servicing procedures must be carried out only by trained personnel.

60HZ, 480V specifications

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