Emerson XM670 User manual

XM670-XM679 Controllers for
Multiplexed Cabinets Installation and
Operation Manual
026-1218 Rev 4

Emerson Commercial and Residential Solutions
1065 Big Shanty Road NW, Suite 100
Kennesaw, GA 30144 USA
770-425-2724 • 1-800-829-2724
www.emerson.com

Table of Contents • 5
Contents
1 INTRODUCTION.......................................................................................................................................................... 1
1.1. GENERAL WARNING ..................................................................................................................................................... 1
2 OVERVIEW ................................................................................................................................................................... 1
2.1. GENERAL DESCRIPTION................................................................................................................................................ 1
2.2. ORDERING CODES......................................................................................................................................................... 2
3 USER INTERFACE ...................................................................................................................................................... 2
3.1. KEYS AND FUNCTIONS ................................................................................................................................................. 2
3.2. USE OF LEDS............................................................................................................................................................... 3
3.3. HOW TO ENTER THE FAST ACCESS MENU ................................................................................................................... 3
3.4. HOW TO SEE THE MAX AND MIN TEMPERATURE RECORDED ................................................................................... 3
3.5. HOW TO SEE AND MODIFY THE SETPOINT ................................................................................................................... 3
3.6. HOW TO START A MANUAL DEFROST.......................................................................................................................... 3
3.7. HOW TO ENTER THE PARAMETERS LIST PR1 .............................................................................................................. 3
3.8. HOW TO ENTER THE PARAMETERS LIST PR2 .............................................................................................................. 4
3.9. HOW TO ASSIGN A MODBUS ADDRESS ..................................................................................................................... 4
3.10. HOW TO CHANGE THE PARAMETER VALUE............................................................................................................... 4
3.11. ON/OFF FUNCTION .................................................................................................................................................... 4
4 FAST ACCESS MENU ................................................................................................................................................. 5
5 SECTION MENU .......................................................................................................................................................... 6
5.1. TO SET ENERGY SAVING TIMES................................................................................................................................... 6
5.2. TO SET TIMED DEFROST PARAMETERS........................................................................................................................ 6
6 ELECTRONIC EXPANSION VALVE MENU (FOR MODEL XM679 ONLY).................................................... 7
7 CONTROLLING LOADS ............................................................................................................................................ 7
7.1. SOLENOID VALVE ......................................................................................................................................................... 7
7.2. STANDARDS REGULATION AND CONTINUOUS REGULATION ....................................................................................... 7
7.2.1. First Kind of Regulation: Standard Regulation.................................................................................................... 8
7.2.2. Second Kind of Regulation: Continuous Regulation (For Model XM679 Only).................................................. 8
7.3. DEFROST ....................................................................................................................................................................... 8
7.3.1. Defrost starting..................................................................................................................................................... 8
7.3.2. Defrost Ending...................................................................................................................................................... 8
7.4. FANS ............................................................................................................................................................................. 9
7.4.1. Control With Relay................................................................................................................................................ 9
7.4.2. Control With Analog Output (If Present).............................................................................................................. 9
7.5. ANTI-SWEAT HEATERS (IF PRESENT)........................................................................................................................... 9
7.6. AUXILIARY OUTPUT ..................................................................................................................................................... 9
8 PARAMETERS LIST.................................................................................................................................................. 10
9 DIGITAL INPUTS....................................................................................................................................................... 19
9.1. GENERIC ALARM (EAL)............................................................................................................................................. 19
9.2. SERIOUS ALARM MODE (BAL)................................................................................................................................... 19
9.3. PRESSURE SWITCH (PAL) .......................................................................................................................................... 19
9.4. DOOR SWITCH INPUT (DOR) ....................................................................................................................................... 19
9.5. START DEFROST (DEF)............................................................................................................................................... 19
9.6. RELAY AUX ACTUATION (AUS) ................................................................................................................................ 19

6 • XM679K I&O Manual 026-1218 Rev 4
9.7. RELAY LIGHT ACTUATION (LIG) ............................................................................................................................... 19
9.8. REMOTE ON/OFF (ONF) ............................................................................................................................................ 19
9.9. KIND OF ACTION (HTR).............................................................................................................................................. 19
9.10. FHU (NOT USED) ..................................................................................................................................................... 19
9.11. ENERGY SAVING INPUT (ES).................................................................................................................................... 19
9.12. CONFIGURABLE INPUT - HOLIDAY FUNCTION (HDY).............................................................................................. 20
9.13. DIGITAL INPUTS POLARITY....................................................................................................................................... 20
10 INSTALLATION AND MOUNTING...................................................................................................................... 20
11 ELECTRICAL CONNECTIONS............................................................................................................................. 21
11.1. PROBE CONNECTIONS ............................................................................................................................................... 21
12 RS485 SERIAL LINE ................................................................................................................................................ 21
13 HOW TO USE THE HOT KEY ............................................................................................................................... 21
13.1. DOWNLOAD (FROM THE HOTKEY TO THE DEVICE).................................................................................................. 21
13.2. UPLOAD (FROM THE DEVICE TO THE HOTKEY) ....................................................................................................... 22
14 ALARM SIGNALS ................................................................................................................................................... 23
14.1. EE ALARM ................................................................................................................................................................ 24
14.2. ALARM RECOVERY ................................................................................................................................................... 24
15 TECHNICAL DATA ................................................................................................................................................. 25
16 UL RATINGS ............................................................................................................................................................. 26
17 CONNECTIONS ........................................................................................................................................................ 27
17.1. E2 TO XM DEVICE COMMUNICATION RECOMMENDATIONS .................................................................................... 27
17.1.1. Wiring Guidelines ............................................................................................................................................. 27
17.2. XM670 - WIRING DIAGRAM..................................................................................................................................... 27
17.3. XM679 - 230VAC VALVES/WIRING DIAGRAM....................................................................................................... 28
17.4. XM679 - 24VAC VALVES/WIRING DIAGRAM ......................................................................................................... 28
18 E2 MODBUS NETWORK WIRING ....................................................................................................................... 29
19 WIRING LAYOUT FOR SHARING A PRESSURE TRANSDUCER ON A LAN............................................ 30
20 PRESSURE TRANSDUCER SETUP (XM679 ONLY) ......................................................................................... 31
20.1. RS485 NET MONITORING TEMPERATURES ............................................................................................................. 31
20.1.1. RS485 Connection............................................................................................................................................. 31
20.2. HOW TO ENABLE A PRESSURE PROBE TO SHARE ACROSS THE LAN ...................................................................... 32
21 WIRING CONNECTION TO SITE SUPERVISOR.............................................................................................. 33
22 ECT MODBUS NETWORKING TO E2S............................................................................................................... 34
22.1. COM PORT ASSOCIATIONS - E2 VERSIONS 3.XX AND BELOW ................................................................................ 34
22.2. COM PORT ASSOCIATIONS - E2 VERSIONS 4.0 AND ABOVE ................................................................................... 34
22.3. E2 SETUP OF DEVICES .............................................................................................................................................. 35
22.3.1. Set Up Network Ports........................................................................................................................................ 35
22.3.2. Add and Connect the Device............................................................................................................................. 35
22.4. WIRING TYPES .......................................................................................................................................................... 37
22.5. MODBUS TERMINATION BLOCKS ........................................................................................................................... 37
23 DEFAULT SETTING VALUES............................................................................................................................... 38
TABLE 23-1 APPENDIX A - ALTERNATE MODBUS COM WIRING METHOD FOR E2, XR, XM, AND XEV
DEVICES ........................................................................................................................................................................... 45

General Warning Introduction • 1
1 Introduction
1.1. General Warning
Please read the following safety precautions and
warnings before using this manual:
2Overview
2.1. How to Check the
Software Release of the
XM679K
1. Check the software release of the
XM679K printed on the label of the 
controller.
2.2. General Description
Models XM670-XM679 are high level
microprocessor based controllers for multiplexed
cabinets, suitable for applications on medium or low
temperature. It can be inserted in a Local Area
Connection (LAN) of up to eight (8) different sections
that can operate depending on the programming, as
stand alone controllers or by following the commands
coming from the other sections.
XM670/XM679 controllers can have six (6) relay
outputs to control the solenoid valve, defrost that can
be either electrical or hot gas, evaporator fans, lights,
auxiliary output, alarm output and an output to drive
pulsed electronic expansion valves (applicable for
XM679 only).
The controllers can also have up to four (4) probe
inputs: the first one for temperature control, the
second for defrost end temperature control of the
evaporator, the third for the display, and the fourth
probe input can be used for applications with virtual
probe or for inlet/outlet air temperature measurement.
Model XM679 can exclusively have two (2) other
probes that can be used for superheat measurement
and regulation. Both XM670 and XM679 controllers
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 (see
address) with a detailed description of the fault.
• Verify the maximum current that can be applied
to each relay (see Section 15, 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 in parallel with
inductive loads could be useful.
Figure 2-1 - XM679K Software Release

2 • XM679K I&O Manual 026-1218 Rev 4
are also equipped with three digital inputs (free
contact) that are fully configurable through
parameters.
The Hot Key connector allows simple programming
of the controllers. Direct serial output RS485
MODBUS-RTU compatible permits a simple XWEB
interfacing. Depending on the model, the Hot Key
connector can also be used to connect X-REP display.
2.3. Ordering Codes
Device
Name Description
Emerson
Part
Number
XM670 Solenoid Case Control
115V 318-6520
XM670 Solenoid Case Control
230V 318-6521
XM679 Pulse Case Control
115V 318-6700
XM679 Pulse Case Control
230V 318-6701
Table 2-1 - Product Ordering Codes

Keys and Functions User Interface • 3
3 User Interface
3.1. Keys and Functions
Table 3-1 lists the keys that are found on the front
panel of XM670-XM679 controllers and the function
of each:
Key Function
Press to display the target setpoint, to
select a parameter in programming mode,
or to confirm an operation. Pressing this
key for three (3) seconds while the
minimum or maximum temperature is
displayed will erase the temperature
currently displayed.
Press this key to browse the parameter
codes in programming mode or increases
the displayed value. Pressing this key for
three (3) seconds will give you access to
the Section menu.
Press this key to access the fast access
menu, browse the parameter codes in
programming mode, decrease the
displayed value, or activate or deactivate
an auxiliary output.
Starts a defrost when pressed for three (3)
seconds.
Switches the room light ON and OFF.
Press for three (3) seconds to switch the
device ON and OFF.
Measurement unit
Measurement unit
Measurement unit
Measurement unit
Key Combinations
Locks/Unlocks the keyboard
Switches mode to programming mode
Exits the programming mode
.
3.2. Use of LEDS
LED Mode Function
ON
Compressor and valve regulation
enabled. To see the valve opening
percentage, enter the fast access
menu.
Flashing Anti-short cycle delay enabled
ON Defrost enabled
Flashing Drip time in progress
ON An alarm is occurring
ON Energy saving enabled
ON Fans enabled (fans are running)
Flashing Door opened or delay after defrost
ON Auxiliary relay ON
ON Measurement unit
Flashing Programming phase
ON The controller is working in 
ALL mode
Flashing The controller is working in
remote virtual display mode
Flashing During the CLOCK modification
(if clock is present)
Each LED function is described in Table 3-2:
Figure 3-1 - XM670 - XM679 Front Panel
Table 3-1 - XM670/XM679 Front Panel Keys and Functions Table 3-2 - LEDs
Table 3-1 - XM670/XM679 Front Panel Keys and Functions
(Continued)

4 • XM679K I&O Manual 026-1218 Rev 4
3.3. How to Enter the Fast
Access Menu
1. Press and release the UP button.
2. The First Label will be displayed. Press the UP or
DOWN button to navigate the menu.
3.4. How to See the MAX
and MIN Temperature
Recorded
1. Press and release the UP button.
2. The First Label will be displayed. Press the UP or
DOWN button to navigate the menu. Search the L°t
label and press SET to see minimum temperature;
search the H°t label and press SET to see maximum
temperature.
3.5. How to See and Modify
the Setpoint
1. Press the SET button for three (3) seconds to show
the setpoint value.
2. The measurement unit starts blinking.
3. To change the setpoint value, press the UP or
DOWN button for 10 seconds.
4. To store the new setpoint value, press the SET key
again or wait 10 seconds.
3.6. How to Start a Manual
Defrost
Press the DEF key for more than three
(3) seconds to start a manual defrost.
3.7. How to Enter the
Parameters List PR1
To enter the parameter list in Pr1 (user accessible
parameters):
1. Enter the programming mode by pressing the SET
and DOWN buttons for a few seconds (wait for the
measurement unit to start blinking).
2. The controller will show the first parameter present
in Pr1.
3.8. How to Enter the
Parameters List PR2
To access the parameter list in Pr2:
1. Enter the Pr1 level. Follow the steps in Section 3.7.,
How to Enter the Parameters List PR1.
2. Select Pr2 parameter and press the SET key.
3. The PAS flashing message will display, followed
shortly by “0 --” with a flashing zero.
4. Use the UP or DOWN button to input the security
code in the flashing digit. Confirm the security code
by pressing SET. The security code is 321.
5. If the security code is correct, the access to Pr2 is
enabled by pressing SET on the last digit.
Another way to enter the programming mode is by
pressing the SET and DOWN buttons for 30 seconds
immediately after switching the controller ON.
Figure 3-2 - Parameters List 2
NOTE:Eachparameterin Pr2 can beremoved
or put into Pr1 (user level) by pressing SET +
DOWN buttons. When a parameter is present
in Pr1, the Alarm LED will be display.