Nexus 1252 User Manual

Doc# E107754 V.1.03 QS - 1
Nexus® 1252 Meter Quickstart
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™
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Nexus® 1252 Meter Quickstart Guide
CAUTION! Installation of the Nexus® 1252 meter must be performed only by qualified personnel who
follow standard safety precautions during all procedures. Those personnel should have appropriate
training and experience with high voltage devices. Appropriate safety gloves, safety glasses and pro-
tective clothing are recommended.
During normal operation of the Nexus® meter, dangerous voltages flow through many parts of the unit, includ-
ing: Terminals and any connected CTs (Current Transformers) and PTs (Potential Transformers), all I/O Modules
and their circuits. All Primary and Secondary circuits can, at times, produce lethal voltages and currents. Avoid
contact with any current-carrying surfaces.
Do not use the meter or any I/O device for primary protection or in an energy-limiting capacity. The meter can
only be used as secondary protection.
IMPORTANT! Refer to your meter’s Installation and Operation Manual for additional safety warnings before
performing installation, wiring, or maintenance of your meter. See the link to the manual, below.
NOTE: This Quickstart Guide gives basic installation, wiring, and programming instructions.For additional meter
operation and programming information, refer to your meter’s Installation and Operation Manual and the Communi-
cator PQA
TM
, MeterManagerPQA
TM
, and EnergyPQA.com
TM
Software User Manual on EIG’s website:
User Manual:
https://www.electroind.com/products/nexus-1252-energy-and-power-quality-meter/
From the webpage, click Technical Documents>User Manual.
Software Manual:
https://www.electroind.com/products/communicatorpqa-software-application-5/
From the webpage, click Technical Documents>User Manual.
CommunicatorPQA
TM
Setup Software:
https://www.electroind.com/products/communicatorpqa-software-application-5/
From the webpage, click Download ComPQA Pro. To get a Professional license for the software, email sales@elec-
troind.com or call 516-334-0870.
All EIG’s metering and software products’ literature can be accessed from:
https://www.electroind.com/all-products/
For software and metering integration, EIG’s Technical Support Engineers are available on an hourly or daily basis to
help with typical commissioning assistance, which includes:
• Verifying meter installation and wiring.
• Verifying proper system integration.
• Working with 3rd parties to ensure cross compatibility.
• Advising users on best practices for optimal implementation.
You can reach Technical Support from 8 a.m. to 8 p.m. EST, Monday-Friday, at 516-334-0870.

Nexus 1252 Specifications

General

Brand	Nexus
Model	1252
Category	Measuring Instruments
Language	English

Summary

Safety and Usage Guidelines

Installation and Operational Safety

Emphasizes qualified personnel, safety precautions, and avoiding contact with dangerous voltages during installation and operation.

Meter Application Limitations

Specifies that the meter is for secondary protection only and not for primary or energy-limiting functions.

Refer to Comprehensive Manuals

Advises consulting the Installation and Operation Manual and Software Manual for detailed safety and operational information.

Accessing Product Resources

Provides links to download user manuals, software applications, and EIG's product literature.

Technical Support Contact

Details how and when to contact EIG's Technical Support for assistance with product implementation and integration.

Mechanical and Display Installation

Mounting the Meter

Instructions for securely mounting the Nexus® 1252 meter to a flat surface using #10 screws.

Environmental Considerations

Recommends mounting in an enclosed space like a switchgear cabinet and installing a labeled disconnecting mechanism.

External Display Mounting and Connection

Guide for mounting the external LED display and connecting it to the meter via RS485 cable.

RS485 Communication Range

Details RS485 communication viability up to 4000 feet and the need for a remote power supply for longer cables.

Electrical Installation and Output Modules

Installing Optional Output Modules

Steps to mount output modules using brackets and connect them via RS485 cables to the meter or other modules.

4-Wire WYE Wiring Configurations

Illustrates wiring configurations for 4-wire, 3-element WYE connections with various PTs and CTs.

Electrical Installation Wiring Configurations

3-Wire Delta Wiring

Diagrams for 3-wire, 2-element Delta configurations with 2 PTs and 2 CTs.

3-Wire Open Delta Wiring

Illustrates wiring for a 3-wire, 2-element Open Delta setup with 3 CTs.

Programming the Meter via Software

Establishing a Serial Connection

Steps to connect the meter using RS485 via the CommunicatorPQA software, detailing connection parameters.

Accessing Meter Device Profile

Procedure to view meter status and access the Device Profile screen for programmable settings.

Programming Meter Settings

Setting CT and PT Ratios

Instructions for configuring CT and PT ratios, system hookup, and operational frequency range in the meter's profile.

Configuring Communications Settings

Details default and configurable settings for serial ports, Network, and Internal Modem options.

Advanced Meter Configuration

Serial Port Configuration Details

Specific parameter settings for serial ports, including address, baud rate, data bits, parity, stop bits, delay, protocol, and mode.

Network and Modem Configuration

Explains settings for Network Option (IP, subnet, gateway) and Internal Modem (rings, baud rate, dial out).

Notes on Communication Settings

Important notes regarding port availability, modem settings, I/O Master configuration, and external display communication requirements.

Programming Meter Functions

Setting the Meter Time

Procedure to set the meter's internal clock, either manually or by synchronizing with the PC's time.

Naming the Meter

How to assign a unique name or designation to the meter for identification in databases and reports.

Updating Device Settings

Instructions to apply changes made in the Device Profile, including meter reboot and network connection considerations.