9.1.1Circuit Breakers

Operating Instructions

9.1.1Circuit Breakers

The UPS can be isolated by means of circuit breakers, mounted inside the cabinet and accessible after opening the front door.

The location of the UPS power switches is shown in Figure 59.

Figure 59 Circuit breakers

The UPS unit circuit breakers are CB1, CB2, CB3 and CB5.

•CB1—Main Input circuit breaker; connects the utility supply to the UPS main input.

•CB2—Bypass circuit breaker; connects the utility supply to the UPS bypass.

•CB3—Maintenance Bypass breaker; connects the utility supply to the UPS maintenance bypass.

•CB5—Output breaker; connects inverter or bypass to the external output transformer or power distribution panel.

9.2UPS Startup

The Liebert NX 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.

9.2.1Startup Procedure

To start the UPS from a fully powered-down condition:

1. Open the UPS door to gain access to the main input circuit breakers.

! WARNING

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.

2.Close CB1, CB2 and CB3 (CB5 is open).

The main input contactor closes automatically and the LCD begins to show start-up

screens. The Rectifier indicator flashes green while the rectifier is starting up. It stops flashing and becomes solid green about 30 seconds after the rectifier enters the normal operation state.

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Emerson 60HZ, 480V user manual 9.2UPS Startup, 9.1.1Circuit Breakers, 9.2.1Startup Procedure, Circuit breakers
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60HZ, 480V specifications

The Emerson 40-120KVA UPS is a high-performing uninterruptible power supply designed to ensure the reliability and continuity of critical operations across various industries. This UPS operates at 480VAC and 60Hz, making it suitable for environments where high-power demands are common.

One of the standout features of this UPS system is its modular design, which allows for easy scalability. Organizations can expand their power capacity as their needs grow, making the Emerson 40-120KVA UPS a future-proof investment. The system operates with high efficiency, minimizing energy consumption and operational costs. This is vital for data centers and industrial applications where energy management is increasingly important.

The Emerson UPS incorporates advanced digital signal processing technology, delivering real-time monitoring and control. This enhances the overall performance and reliability of the system, providing seamless power protection against voltage fluctuations, surges, and interruptions. With a total harmonic distortion of less than 5%, the UPS ensures a clean and stable power output, preserving the integrity of sensitive electronic equipment.

Another noteworthy characteristic of the Emerson 40-120KVA is its redundancy features. The system supports N+1 redundancy, allowing for one extra module to ensure uninterrupted service in case of a failure. This design offers peace of mind for critical applications, ensuring that there is no single point of failure.

User-friendliness is also a significant aspect of the Emerson UPS. The intuitive graphical user interface simplifies monitoring and management, allowing operators to assess system performance and status at a glance. Additionally, remote monitoring capabilities enable real-time tracking of system health and performance from anywhere, providing flexibility and oversight for facility managers.

The Emerson 40-120KVA UPS also meets stringent safety and compliance standards, ensuring reliable operation in demanding environments. Its robust design is suitable for a variety of applications, including information technology, telecommunications, and industrial processes. Overall, the Emerson 40-120KVA UPS stands out as a reliable, efficient, and versatile solution for businesses aiming to safeguard their critical power supply against any disruption.
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