Emerson XM678D User Manual

XM678D Controllers for Multiplexed
Cabinets with Interior Stepper Driver
Installation and Operation Manual for
Software Release 2.8
026-1219 Rev 3

Emerson XM678D Specifications

General

Brand	Emerson
Model	XM678D
Category	Controller
Language	English

Summary

Introduction to XM678D Controllers

General Precautions and Warnings

Safety precautions and warnings for operating the device.

Quick Reference for Self Adaptive Regulation

XM678D Installation and Mounting Guide

Mounting and Environmental Considerations

XM678D Wiring and Connections

Wiring Guidelines for Components

XM678D Main Wiring Diagram

Detailed wiring diagram and connection points for the XM678D controller.

Valve Connections and Configuration

Cable Types and Maximum Length for Valves

Stepper Valve Selection Guide

Specific Valve Wiring

Emerson EX3 Valve Wiring

Additional Wiring Details

Interface and Network Connections

CX660 Keyboard Display Connectivity

LAN Connection Setup

Instructions for setting up a Local Area Network (LAN) connection.

Superheat Control Sensor Configuration

Connecting and configuring sensors for superheat control.

Pressure Transducer and Monitoring System

Single Pressure Transducer Use on Multiplexed Applications

Guide for using one pressure transducer across multiple controllers on a LAN.

Connecting to the Monitoring System

Instructions for connecting the XM678D to a monitoring system via RS485.

Digital and Analog I/O Connections

Digital Input Wiring and Configuration

Analog Output Wiring and Configuration

Battery Back Up Connection

XEC Supercap Battery Backup Connection

Additional Backup Connection

Emerson ECP-024 Accumulator Connection

Wiring for Shared Pressure Transducers

XM678D Pressure Transducer Setup

RS485 Net Monitoring of Temperatures

Monitoring temperatures using RS485 and pressure transducer setup.

Pressure Transducer Sharing Configuration

RS485 Network Connection for Sharing

Enabling Pressure Probe Sharing Across LAN

Step-by-step guide to enable sharing pressure probes over the LAN.

Wiring Connection to Site Supervisor

XM678D User Interface

Direct Command Interface Operation

Keyboard Commands and Setpoint Modification

XM678D Keyboard Commands

Modifying Air Temperature Regulation Setpoint

Programming Parameters (Pr1 and Pr2)

Entering the Pr2 Programming Level

Fast Access Menu Guide

Multimaster Function Menu (SEC)

Synchronized Defrost Management

Commissioning Procedures

Electronic Valve Settings Configuration

Configuration parameters for electronic valves.

Superheat Regulation Modes

Manual Operating Mode (AMS = NO)

Details of manual superheat regulation using ON/OFF or continuous modes.

Advanced Superheat Regulation

Self Adaptive Operating Mode (AMS = YES)

How to enable and use the self-adaptive superheat regulation mode.

Display Messages and Alarm Recovery

XM678D Alarm Recovery Procedures

Procedures for recovering from various alarm conditions.

Programming with the Hot Key

Downloading Parameters from Hot Key

Uploading Parameters to Hot Key

Controlling Loads

XM678D Cooling Output Management

How the controller manages cooling output based on temperature.

Defrost Cycle Management

Information on defrost cycles, including starting and modes.

Technical Data Specifications

UL Ratings Compliance

E2 MODBUS Network Wiring

ECT MODBUS Networking to E2s

E2 COM Port Associations (Versions 4.0+)

Configuring COM ports on E2 for MODBUS communication.

E2 Device Setup for MODBUS

Setting Up E2 Network Ports

Adding and Connecting Devices to E2

MODBUS Termination Blocks

Default Parameter Map Overview

XM678D Controller Association and Replacement

Associating XM678D with Case Control Circuit in E2

Alternate MODBUS COM Wiring Method