Operation

10.0OPERATION

10.1Liebert® APM™ Operating Modes

The Liebert APM can operate in any of three modes, as shown in Table 28. This section provides instructions on switching between modes, resetting the UPS, switching the inverter On and Off and performing other operations.

Table 28 UPS operating modes

Operating Mode

Description

 

 

Normal

The UPS is powering the load.

Operation

 

On Maintenance

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

Supply line.

Bypass

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

 

 

 

On Static Bypass

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

temporary mode during load transfers between inverter and maintenance bypass or supply

 

under abnormal operating conditions.

NOTE

1. The user controls and indicators mentioned in these procedures are identified in 9.0 - 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 unit 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 APM, the unit must be commissioned by an Emerson-authorized engineer.

10.2UPS Startup

The Liebert APM must be fully installed and commissioned before startup, and external power isolators must be closed. Once those general conditions are met, the UPS may be started.

! WARNING

Risk of electrical shock and arc flash. Can cause property damage, injury and death. During this procedure the output terminals will become live.

If any load equipment is connected to the UPS output terminals, please check with the load user and ascertain whether it is safe to apply power to the load. If the load is not ready to receive power, then ensure that it is safely isolated from the UPS output terminals.

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Emerson 115-600V, 115-120, 15-90KVA, 115-208, 115-50/60HZ, 115-480 user manual Liebert APM Operating Modes, UPS Startup
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115-600V, 115-208, 115-120, 115-50/60HZ, 115-480 specifications

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