Operating Instructions; Liebert Nx Operating Modes; Table 32 Ups Operating Modes - Liebert NX User Manual

11.0 O
PERATING
11.1

Liebert NX Operating Modes

The Liebert NX can operate in any of four modes, as shown in Table 32. This section provides
instructions on switching between modes, resetting the UPS, switching the inverter On and Off and
performing other operations.
Table 32 UPS operating modes
Operating Mode
Normal
Operation
On Maintenance
Bypass
On Test
On Static Bypass
NOTE
1. The user controls and indicators mentioned in these procedures are identified in 10.0 -
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.
I
NSTRUCTIONS
Circuit Breaker
State
CB1:ON
CB2:ON
The UPS is powering the load.
CB3:OFF
CB5:ON
CB1:OFF The UPS is shut down but the load is connected to utility power via the
CB2:OFF 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 No load power is supplied by the UPS. The load is connected to utility power
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
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
Description
94

Operating Instructions

® ™
Liebert NX