9.0OPERATING INSTRUCTIONS

Operating Instructions

9.0OPERATING INSTRUCTIONS

9.1Liebert NX Operating Modes

The Liebert NX can operate in any of four modes, as shown in Table 20. This section provides instructions on switching between modes, resetting the UPS, switching the inverter On and Off and performing other operations.

Table 20 UPS operating modes

 

Circuit Breaker

 

Operating Mode

State

Description

 

 

 

 

CB1:ON

The UPS is powering the load.

Normal

CB2:ON

 

Operation

CB3:OFF

 

 

CB5:ON

 

 

CB1:OFF

The UPS is shut down but the load is connected to utility power via the

On Maintenance

CB2:OFF

Maintenance Bypass Supply line.

Bypass

CB3:ON

NOTE: The load is not protected against disturbances in AC input power in

 

CB5:OFF

this mode.

 

CB1:ON

No load power is supplied by the UPS. The load is connected to utility power

On Test

CB2:ON

via the Maintenance Bypass Supply line.

CB3:ON

NOTE: The load is not protected against disturbances in AC input power in

 

 

CB5:OFF

this mode.

 

 

 

 

CB1:ON or OFF

The load power is supplied through the static bypass line. This may be

On Static Bypass

CB2:ON

considered as a temporary mode during load transfers between inverter and

CB3:OFF

maintenance bypass or supply under abnormal operating conditions.

 

CB5:ON

 

NOTE

1. The user controls and indicators mentioned in these procedures are identified in 8.0 - Operator Control and Display Panel.

2.The audible alarm may sound at various points during these procedures. It can be canceled at any time by pressing the SILENCE ON/OFF push button.

NOTE

This section refers to some modes and conditions that are set or adjusted using proprietary service software. To take advantage of all the available features for the Liebert NX, the unit must be commissioned by a Liebert factory-trained service engineer.

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Emerson 480V, 60HZ user manual 9.1Liebert NX Operating Modes, 9.0OPERATING INSTRUCTIONS, UPS operating modes

60HZ, 480V specifications

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