Configuring Your Neutral and Ground Connections

6.2Alternate Grounding Configuration, Wye-Connected Service

This configuration must NOT be used when single-phase loads are directly connected to the UPS.

The alternate configuration is similar to that shown in 6.1 - Preferred Grounding Configuration, Wye-Connected Service, except that the service entrance neutral is not brought into the UPS mod- ule. In this configuration, the UPS output transformer is considered a separately derived source. The UPS module neutral is bonded to the UPS ground, which is connected to a local grounding electrode in accordance with NEC 250-26.

Please note that this configuration represents a price/performance trade-off. Whenever the UPS mod- ule transfers to or from bypass, two AC sources (input and bypass) are briefly connected together and circulating current must flow. In the previous configuration, the current flows through the neutral conductor. In this configuration, the current flows through the ground path, possibly tripping ground fault interrupters (GFIs) and distorting the bypass waveform reference.

Proper adjustment of ground fault interrupters is necessary to avoid unwanted tripping.

Figure 5 Alternate grounding configuration, wye-connected service

This configuration is reserved for applications that meet all the following criteria:

• The facility has wye-connected service.

• The module rectifier input and bypass input are fed from the same source.

• The connected load is strictly 3-wire (such as one or more PDUs) and does not require a neu- tral from the UPS.

• Special precautions are taken to prevent tripping the ground fault interrupters. The time delay should be set to at least 0.2 seconds to prevent tripping when the UPS performs a trans- fer or retransfer operation.

! CAUTION

Failure to properly set the ground fault interrupters could cause loss of power to the critical load.

15

Page 20 Page 22
Page 21
Image 21
Emerson Series 610 installation manual Alternate Grounding Configuration, Wye-Connected Service
Page 20 Page 22

Series 610 specifications

The Emerson Series 610 is a cutting-edge solution for precise process measurement and control, designed specifically for industries where accuracy and reliability are paramount. This advanced instrument, often utilized in oil and gas, chemical processing, and water treatment sectors, combines innovative technology with robust features to meet the demanding requirements of modern industrial applications.

One of the standout features of the Series 610 is its exceptional measurement accuracy. The device employs advanced sensor technology that enables precise determination of variables such as pressure, temperature, and flow. This accuracy translates into improved process efficiency and enhanced product quality. With a wide range of measurement capabilities, the Series 610 can handle varying process conditions and fluid types, making it versatile across different applications.

The heart of the Emerson Series 610 lies in its intelligent diagnostics and predictive maintenance functionalities. This built-in technology allows for real-time monitoring of the device's operational status, providing valuable insights into performance trends. By detecting anomalies early, users can take proactive measures to prevent potential failures, thereby reducing downtime and maintenance costs.

Moreover, the Series 610 is designed with user-friendly features. Its intuitive interface and easy-to-navigate menus facilitate quick setup and configuration, enabling operators to be productive from the outset. The device also supports various communication protocols, including HART and FOUNDATION fieldbus, ensuring seamless integration into existing control systems and enhancing overall automation capabilities.

Another notable characteristic of the Emerson Series 610 is its robust construction. Designed to withstand harsh environmental conditions, it is built with durable materials that offer high resistance to corrosion and physical damage. This durability ensures longevity and reliability, even in the most challenging industrial environments.

In summary, the Emerson Series 610 represents a significant advancement in process measurement technology. With its exceptional accuracy, intelligent diagnostics, user-friendly design, and robust construction, it is an ideal choice for industries seeking to enhance their operational efficiency and reliability. Its ability to seamlessly integrate into existing systems further solidifies its position as a leading solution in the field of industrial measurement and control. As industries continue to evolve, the Series 610 is poised to meet the challenges of the future with confidence and precision.
Top Page Image Contents