Emerson XM678D - Page 74

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Figure 1 - MODBUS COM Wiring Diagram

66 • XM678D I&O Manual 026-1219 Rev 3

Table of Contents

Default Chapter5
- Table of Contents5
1 Introduction9
- General Precautions and Warnings9
2 Before Proceeding9
- Software Release of Xm678D9
3 Overview10
- General Description10
- Ordering Code10
4 Quick Reference Guide in Running the Self Adaptive Regulation10
5 Installation and Mounting12
6 Wiring Diagram and Connections13
- Important Note13
- Wiring Guidelines13
- Xm678D Wiring and Connections13
- Valve Connections and Configuration14
- Wiring Connection of Emerson Ex3 Valve17
- Absolute Maximum Power18
- Keyboard Display Cx66019
- Lan Connection19
- Sensors for Superheat Control19
- How to Use a Single Pressure Transducer on Multiplexed Applications20
- How to Connect the Monitoring System20
- Digital Inputs21
- Analog Output21
7 Battery Back up Connection22
- Xec Supercap Connection22
- Emerson Ecp-024 Connection23
8 Wiring Layout for Sharing a Pressure Transducer on a Lan23
9 Pressure Transducer Setup25
- Rs485 Net Monitoring Temperatures25
  - RS485 Connection26
- How to Enable a Pressure Probe to Share Across the Lan26
10 Wiring Connection to Site Supervisor27
11 User Interface28
- Direct Command Interface28
- Icons28
- Keyboard Commands29
  - Double Commands29
- How to Modify the Air Temperature Regulation Setpoint29
12 How to Program the Parameters (Pr1 and Pr2)30
- How to Enter Pr230
- How to Move a Parameter from Pr1 to Pr2 Level and Vice Versa30
13 Fast Access Menu31
14 Multimaster Function Menu (Sec)32
- Synchronized Defrost33
  - Daily Defrost from RTC: [Edf = Rtc]33
15 Commissioning34
- Clock Setting and Rtc Alarm Reset34
- Electronic Valve Settings34
16 Regulation for Superheat: Self Adaptive or Manual Operating Mode35
- Pressure Filtering - Sub Parameter35
- General Considerations35
- Manual35
- Self Adaptive Operating Mode Ams = Yes36
- Minimum Stable Superheat Search - Ams = Yes, Atu = Yes36
- Valve Capacity Reducing - Mnf Parameter36
  - Auto Zero Procedure (Go Home Functions)37
17 Display Messages38
- Alarm Recovery39
18 Use of the Programming Hot Key40
- Download (from the Hotkey to the Device)40
- Upload (from the Device to the Hotkey )40
19 Controlling Loads41
- Cooling Output41
- Standard Regulation and Continuous Regulation41
- Defrost41
  - Defrost Starting41
  - Defrost Ending42
- Fans42
  - Control with Relay42
  - Control with Analog Output (if Present)42
- Anti-Sweat Heaters42
- Auxiliary Output43
20 Technical Data44
21 Ul Ratings46
22 E2 Modbus Network Wiring47
23 Ect Modbus Networking to E2S48
- Com Port Associations - E2 Versions 4.0 and above48
- E2 Setup of Devices49
  - Set up Network Ports49
  - Add and Connect the Device49
- Wiring Types50
- Modbus Termination Blocks51
24 Default Parameter Map52
25 Xm678D Controller Association and Replacement Procedure69
- Overview69
- Case Circuit Output Connections69
- Defrost Synchronization69
- Case Circuit Input Connections69
  - Associating the XM678D with Case Control Circuit in E269
  - Replacing the XM678D on E271
Appendix A - Alternate Modbus Com Wiring Method for E2, Xr, XM, and Xev Devices73

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