Emerson XM678D Specification sheet

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

Emerson
1065 Big Shanty Road NW, Suite 100
Kennesaw, GA 30144
770-425-2724 • www.emerson.com

Table of Contents • v
Table of Contents
1 INTRODUCTION.......................................................................................................................................................... 1
1.1. GENERAL PRECAUTIONS AND WARNINGS.................................................................................................................... 1
2 BEFORE PROCEEDING ............................................................................................................................................. 1
2.1. SOFTWARE RELEASE OF XM678D ............................................................................................................................... 1
3 OVERVIEW ................................................................................................................................................................... 2
3.1. GENERAL DESCRIPTION................................................................................................................................................ 2
3.2. ORDERING CODE .......................................................................................................................................................... 2
4 QUICK REFERENCE GUIDE IN RUNNING THE SELF ADAPTIVE REGULATION .................................... 2
5 INSTALLATION AND MOUNTING ......................................................................................................................... 4
6 WIRING DIAGRAM AND CONNECTIONS ............................................................................................................ 5
6.1. IMPORTANT NOTE......................................................................................................................................................... 5
6.2. WIRING GUIDELINES .................................................................................................................................................... 5
6.3. XM678D WIRING AND CONNECTIONS ........................................................................................................................ 5
6.4. VALVE CONNECTIONS AND CONFIGURATION .............................................................................................................. 6
6.4.1. Types of Cables and Max Length.......................................................................................................................... 6
6.4.2. Valve Selection...................................................................................................................................................... 6
6.4.3. 4-Wire Valves (Bipolar) ........................................................................................................................................ 9
6.4.4. 5- to 6-Wire Valves (Unipolar) ............................................................................................................................. 9
6.5. WIRING CONNECTION OF EMERSON EX3 VALVE ........................................................................................................ 9
6.5.1. Solenoid Valve Connection ................................................................................................................................... 9
6.5.2. EX3 with 24Vac Coil: Transformer Capacity....................................................................................................... 9
6.5.3. Stepper Valve Connection................................................................................................................................... 10
6.5.4. EX3-C230............................................................................................................................................................ 10
6.6. ABSOLUTE MAXIMUM POWER.................................................................................................................................... 10
6.7. KEYBOARD DISPLAY CX660...................................................................................................................................... 11
6.8. LAN CONNECTION ..................................................................................................................................................... 11
6.9. SENSORS FOR SUPERHEAT CONTROL ......................................................................................................................... 11
6.10. HOW TO USE A SINGLE PRESSURE TRANSDUCER ON MULTIPLEXED APPLICATIONS .............................................. 12
6.11. HOW TO CONNECT THE MONITORING SYSTEM ........................................................................................................ 12
6.12. DIGITAL INPUTS........................................................................................................................................................ 13
6.13. ANALOG OUTPUT ..................................................................................................................................................... 13
7 BATTERY BACK UP CONNECTION..................................................................................................................... 14
7.1. XEC SUPERCAP CONNECTION.................................................................................................................................... 14
7.2. EMERSON ECP-024 CONNECTION .............................................................................................................................. 15
8 WIRING LAYOUT FOR SHARING A PRESSURE TRANSDUCER ON A LAN.............................................. 15
9 PRESSURE TRANSDUCER SETUP ........................................................................................................................ 17
9.1. RS485 NET MONITORING TEMPERATURES ................................................................................................................ 17
9.1.1. RS485 Connection............................................................................................................................................... 18
9.2. HOW TO ENABLE A PRESSURE PROBE TO SHARE ACROSS THE LAN ........................................................................ 18
10 WIRING CONNECTION TO SITE SUPERVISOR ............................................................................................. 19
11 USER INTERFACE .................................................................................................................................................. 20

vi • XM678D I&O Manual 026-1219 Rev 3
11.1. DIRECT COMMAND INTERFACE ................................................................................................................................ 20
11.2. ICONS ........................................................................................................................................................................ 20
11.3. KEYBOARD COMMANDS ........................................................................................................................................... 21
11.3.1. Double Commands ........................................................................................................................................... 21
11.4. HOW TO MODIFY THE AIR TEMPERATURE REGULATION SETPOINT ........................................................................ 21
12 HOW TO PROGRAM THE PARAMETERS (PR1 AND PR2) ........................................................................... 22
12.1. HOW TO ENTER PR2 ................................................................................................................................................. 22
12.2. HOW TO MOVE A PARAMETER FROM PR1 TO PR2 LEVEL AND VICE VERSA .......................................................... 22
13 FAST ACCESS MENU.............................................................................................................................................. 23
14 MULTIMASTER FUNCTION MENU (SEC) ........................................................................................................ 24
14.1. SYNCHRONIZED DEFROST......................................................................................................................................... 25
14.1.1. Daily Defrost From RTC: [EdF = rtC] ........................................................................................................... 25
15 COMMISSIONING ................................................................................................................................................... 26
15.1. CLOCK SETTING AND RTC ALARM RESET............................................................................................................... 26
15.2. ELECTRONIC VALVE SETTINGS................................................................................................................................. 26
16 REGULATION FOR SUPERHEAT: SELF ADAPTIVE OR MANUAL OPERATING MODE..................... 27
16.1. PRESSURE FILTERING - SUB PARAMETER................................................................................................................. 27
16.2. GENERAL CONSIDERATIONS ..................................................................................................................................... 27
16.3. MANUAL OPERATING MODE - AMS = NO ............................................................................................................. 27
16.3.1. ON/OFF Temperature Regulation [CrE = n].................................................................................................. 28
16.3.2. Continuous Temperature Regulation [CrE = Y] (With Superheat Regulation) .............................................. 28
16.3.3. Continuous Temperature Regulation [CrE = Y] (Without Superheat Regulation) ......................................... 28
16.4. SELF ADAPTIVE OPERATING MODE - 
AMS = YES ........................................................................................................................................................................ 28
16.5. MINIMUM STABLE SUPERHEAT SEARCH - AMS = YES, ATU = YES..................................................................... 28
16.6. VALVE CAPACITY REDUCING - MNF PARAMETER .................................................................................................. 28
16.6.1. Auto Zero Procedure (Go Home Functions).................................................................................................. 29
17 DISPLAY MESSAGES.............................................................................................................................................. 30
17.1. ALARM RECOVERY ................................................................................................................................................... 31
18 USE OF THE PROGRAMMING HOT KEY ......................................................................................................... 32
18.1. DOWNLOAD (FROM THE HOTKEY TO THE DEVICE).................................................................................................. 32
18.2. UPLOAD (FROM THE DEVICE TO THE HOTKEY) ....................................................................................................... 32
19 CONTROLLING LOADS......................................................................................................................................... 33
19.1. COOLING OUTPUT..................................................................................................................................................... 33
19.2. STANDARD REGULATION AND CONTINUOUS REGULATION ..................................................................................... 33
19.2.1. Standard regulation: [CrE = n]....................................................................................................................... 33
19.2.2. Continuous regulation:

[CrE = Y] ........................................................................................................................................................................ 33
19.2.3. Evaporator valves: [CrE = EUP].................................................................................................................... 33
19.3. DEFROST ................................................................................................................................................................... 33
19.3.1. Defrost starting ................................................................................................................................................ 33
19.3.2. Defrost Ending ................................................................................................................................................. 34
19.4. FANS ......................................................................................................................................................................... 34
19.4.1. Control With Relay........................................................................................................................................... 34
19.4.2. Control With Analog Output (If Present)......................................................................................................... 34
19.5. ANTI-SWEAT HEATERS ............................................................................................................................................. 34

Table of Contents • vii
19.6. AUXILIARY OUTPUT ................................................................................................................................................. 35
20 TECHNICAL DATA ................................................................................................................................................. 36
21 UL RATINGS............................................................................................................................................................. 38
22 E2 MODBUS NETWORK WIRING ....................................................................................................................... 39
23 ECT MODBUS NETWORKING TO E2S .............................................................................................................. 40
23.1. COM PORT ASSOCIATIONS - E2 VERSIONS 4.0 AND ABOVE................................................................................... 40
23.2. E2 SETUP OF DEVICES.............................................................................................................................................. 41
23.2.1. Set Up Network Ports....................................................................................................................................... 41
23.2.2. Add and Connect the Device............................................................................................................................ 41
23.3. WIRING TYPES.......................................................................................................................................................... 42
23.4. MODBUS TERMINATION BLOCKS........................................................................................................................... 43
24 DEFAULT PARAMETER MAP.............................................................................................................................. 44
25 XM678D CONTROLLER ASSOCIATION AND REPLACEMENT PROCEDURE........................................ 61
24.1. OVERVIEW ................................................................................................................................................................ 61
24.2. CASE CIRCUIT OUTPUT CONNECTIONS .................................................................................................................... 61
24.3. DEFROST SYNCHRONIZATION................................................................................................................................... 61
24.4. CASE CIRCUIT INPUT CONNECTIONS........................................................................................................................ 61
24.4.1. Associating the XM678D with Case Control Circuit in E2 ............................................................................. 61
24.4.2. Replacing the XM678D on E2 ......................................................................................................................... 63
APPENDIX A - ALTERNATE MODBUS COM WIRING METHOD FOR E2, XR, XM, AND XEV DEVICES .65

General Precautions and Warnings Introduction • 1
1 Introduction
1.1. General Precautions
and Warnings
Please read the following safety precautions and
warnings before using this manual:
2 Before
Proceeding
2.1. Software Release of
XM678D
1. Look at the software release of XM678D printed on
the label of the controller.
2. If the software release is 2.8, proceed with this
manual; otherwise contact Emerson Retail
Solutions for the correct manual.
WARNING! An isolated transformer for the
XM678D power supply must be used. Do not
share power with any other devices.
CAUTION!
• This manual is part of the product and should
be kept near the device for easy and quick
reference.

• The device should not be used for purposes different
from those described in this manual. It cannot be used
as a safety device.

• Check the application limits before proceeding.
SAFETY PRECAUTIONS AND 
WARNINGS!
• Check that the supply voltage is correct
before connecting the device.
• Do not expose to water or moisture: use the
controller only within the operating limits and avoid
sudden temperature changes with high atmospheric
humidity to prevent condensation from forming.
• Warning! Disconnect all electrical connections
before performing any kind of maintenance.
• Fit the probe where it is not accessible by the end
user. The device must not be opened.
• In case of failure or faulty operation, send the
device back to the distributor or to Emerson Retail
Solutions (see address) with a detailed description of
the fault.
• Verify the maximum current that can be applied to
each relay (see Section 20, Technical Data).
• Ensure that the wires for probes, loads, and the
power supply are separated and far enough from each
other without crossing or intertwining.
• In case of applications in industrial environments,
the use of main filters (our mod. FT1) in parallel with
inductive loads could be useful.
Figure 2-1 - Software Release of XM678D

2 • XM678D I&O Manual 026-1219 Rev 3
3Overview
3.1. General Description
The XM678D controller is a microprocessor based
controller for multiplexed cabinets suitable for
applications on medium or low temperature. It can be
inserted in a proprietary Local Area Network (LAN)
with up to eight (8) different sections that can operate,
depending on the programming, as standalone
controllers or by following the commands coming
from the other sections. The XM678D controller is
provided with six (6) relay outputs to control the
solenoid valve, defrost that can be either electrical or
hot gas, evaporator fans, lights, an auxiliary output
and an alarm output, and with the stepper valve driver.
It also has six (6) probe inputs: for temperature
control, defrost end temperature control, display and
the fourth can be used for application with virtual
probe or for inlet/outlet air temperature measurement.
The fifth and sixth probe inputs are used to evaluate
and control the superheat. The XM678D is also
equipped with three (3) free contact digital inputs that
are fully configurable by parameters.
The Hotkey connector allows simple programming of
the controller. The optional direct serial output RS485
that is MODBUS compatible permits simple XWEB
interfacing. Optionally, an RTC is available.
Depending on the model, the Hotkey connector can
be used to connect the X-REP display.
3.2. Ordering Code
4 Quick Reference
Guide in Running
the Self Adaptive
Regulation
1. After wiring the XM678D; configure the type of
valve, bipolar or unipolar, via tEu (Default 
tEu = bP: bipolar) and tEP (Default tEP =0)
parameters or through the manual settings. See
Section 6.4., Valve Connections and
Configuration for details.
2. Set the proper gas via Fty parameter.
Preset gas is R404A.
Device Name Emerson Code
XM678D 318-6600
Table 3-1 - Product Ordering Code
NOTE: For Alco EX4, EX5, EX6 tEP = 11.
For EX3: tEP = 12
LABEL REFRIGERANT OPERATING
RANGE
R22 r22 -58 to 120°F/
-50 to 60°C
134 r134A -58 to 120°F/
-50 to 60°C
290 r290 - Propane -58 to 120°F/
-50 to 60°C
404 r404A -94 to 120°F/
-70 to 60°C
47A r407A -58 to 120°F/
-50 to 60°C
47C r407C -58 to 120°F/
-50 to 60°C
47F r4107F -58 to 120°F/
-50 to 60°C
410 r410A -58 to 120°F/
-50 to 60°C
448 r448A -69 to 120°F/
-45 to 60°C
Table 4-1 - XM678D Gas Table