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Emerson 480V user manual Maintenance Bypass Procedure and Powering Down the UPS

Models: 480V

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Operating Instructions

9.3Maintenance Bypass Procedure and Powering Down the UPS

Follow the procedure below to transfer the load from the inverter output to the Maintenance Bypass line of the UPS.

! CAUTION

Before performing this operation, read the messages on the LCD to be sure that bypass supply is regular and the inverter is synchronous with it. If those conditions are not present, there is a risk of a short interruption in powering the load.

This procedure assumes that the UPS is operating normally.

1.Press the INVERTER OFF button on the operator control panel for longer than 2 seconds.

The Inverter indicator will turn off and the status indicator will turn amber and an audible alarm will sound. The load will transfer to static bypass and the inverter will shut off.

NOTE

Pressing the Alarm Silence Switch cancels the audible alarm, but leaves the warning message displayed until the relevant condition is rectified.

2.Close maintenance breaker CB3.

The Maintenance Bypass supply is now in parallel with the UPS Static Switch supply.

3.Open output breaker CB5. This ends the bypass procedure. The load is now powered directly from the Maintenance Bypass supply.

4.Press the EPO (Emergency Power Off) button at the UPS front panel of this UPS module only. This will disable further Rectifier, Inverter, Static Switch and Battery operation. This will not affect the manual maintenance bypass power switch. If a Liebert NX battery cabinet is connected, the battery circuit breaker will shunt trip open.

5.Open the rectifier switch CB1 and bypass breaker CB2.

All operator indicators and messages will turn off as the utility-driven internal power supplies decay. The unit will power down, but the load will continue to be supplied by the manual Mainte- nance bypass.

! WARNING

Wait 5 minutes for the internal DC busbar capacitors to discharge before attempting to remove the internal protective barriers.

! WARNING

Even with the UPS in maintenance bypass and “Off,” portions of the unit are still energized. Service is to be performed by qualified personnel only.

! CAUTION

The load equipment is not protected from normal supply aberrations when operating in maintenance bypass mode.

6. To return unit to normal operation, follow the steps in 9.2.1 - Startup Procedure.

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Emerson 480V user manual Maintenance Bypass Procedure and Powering Down the UPS
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480V specifications

The Emerson 480V power systems play a critical role in modern industrial applications, providing reliable and efficient power distribution. These systems are designed for facilities that require robust performance and operational efficiency while adhering to safety regulations. With voltage ratings at 480V, they cater primarily to industries such as manufacturing, data centers, and commercial buildings.

One of the main features of the Emerson 480V systems is their scalability. These systems can be easily adapted and expanded as operational demands grow, thereby reducing initial investment costs and providing a flexible solution for evolving business needs. This ability to scale is crucial in a fast-paced environment where demands can change rapidly.

The Emerson 480V systems also incorporate advanced technologies for improved performance and safety. One key technology is the use of smart grid solutions. This enables real-time monitoring, diagnostics, and control, allowing facility managers to optimize energy consumption and reduce operational costs. Furthermore, these systems often include integrated protection devices that enhance safety measures by minimizing the risk of electrical faults, overloads, or short circuits.

Energy efficiency is another characteristic that distinguishes Emerson 480V systems from traditional alternatives. With advanced power management features, these systems effectively reduce energy waste and lower electricity bills. Emerson’s commitment to sustainability is evident in its designs, which aim to minimize environmental impact through energy-efficient technologies.

The build quality of Emerson 480V systems is also noteworthy. They are designed to withstand harsh industrial environments and are constructed with high-grade materials that promote longevity and reliability. The modular design allows for easy maintenance and repair, which further extends the lifespan of the system.

Additionally, Emerson 480V systems are equipped with user-friendly interfaces that facilitate ease of operation. This ensures that operators can efficiently manage and control power distribution without extensive training. The combination of performance, scalability, safety features, and user-centric design makes Emerson 480V systems an ideal choice for businesses looking to enhance their electrical infrastructure.

In summary, Emerson 480V power systems are a leading solution for industrial power distribution, characterized by their scalability, smart technology integration, energy efficiency, robust build quality, and user-friendly operation. These attributes make them a valuable investment for any organization aiming to improve its electrical management and operational performance.