Danfoss MCX08M User manual

REFRIGERATION &

AIR CONDITIONING DIVISION User manual

MAKING MODERN LIVING POSSIBLE

Danfoss Electronics spa

Air handling Seq.

control algorithm

Software version 2.1

DKRCC.PS.RI.A1.02 / 520H4358 - Air Handling Seq. user manual - V 2.2

Produced by Danfoss Electronics spa Graphic Department, 10-2009

Danfoss Electronics spa

Air Handling seq. - user manual

Index

1| Introduction 4

2| User interface 5

2.1| Keyboard 5

2.1.1| Direct access to special functions 5

2.1.2| Menu navigation 5

2.2 Turning the unit ON and OFF 5

2.3| Main screen 6

2.3.1| LED Display 6

2.3.2| LCD Display 7

2.4| Menu-based navigation 8

2.4.1| Displaying and managing alarms 9

2.4.2| Login 9

2.4.3| Parameters 10

2.4.4| Displaying the input/output values 10

2.4.5| Utilities 11

3| Conguring the AHU software 13

3.1| Conguration overview 13

3.2| Input/Output conguration 14

4| Coils control 17

4.1| Assign a control sequence to a coil 17

4.2| Coil output management 18

4.3| Valve control 19

4.3.1| ON/OFF and 0/10V valve control 19

4.3.2| 3-point valve control 20

4.4| Step control 21

4.4.1| Linear step switch 21

4.4.2| Variable step switch 22

4.4.3| Binary step switch 23

4.5| Locking sequences 24

4.6| Pumps control 25

4.7| Single Heat/Cool coils 26

4.8| Cooling coil defrost control 27

4.9| Heat/Cool request 27

5| Dampers and Energy recovery control 28

5.1| External and Mixing dampers 28

5.1.1| ON/OFF dampers 29

5.1.2| 0/10V dampers 29

5.1.3| Damper locked 29

5.2| Energy recovery 30

6| Temperature control sequences 31

6.1| Damper control sequences 31

6.1.1| Freecooling/Freeheating selection 32

6.1.2| Minimum opening 32

6.2| Heat and cool control sequences 33

6.3| Connection of setpoint sequences 35

6.4| Main setpoint 36

6.5| Local setpoint 37

7| Cascade Control 38

8| Examples 39

8.1| Example 1 39

8.2| Example 2 40

9| Frost protection 42

10| Controlling the supply temperature limits 43

10.1| Supply temperature limits in cascade control 43

10.2| Supply temperature lower limit 43

10.3| Supply temperature upper limit 44

11| umidity control 45

11.1| Control sequences 46

11.2| Humidier control 46

11.3| Dehumidier control 47

11.3.1| Cooling coil in dehumidication 48

11.4| Controlling the supply humidity limits 49

11.4.1| Upper limit 50

11.4.2| Lower limit 50

12| Supply and return fans 51

12.1| Type of supply and return fans 51

12.2| Fan speed conguration 53

12.3| Fans and antifreeze 54

12.4| Fans lock 54

13| Air quality control 55

14| Alarms 56

14.1| Actions following an alarm 56

14.2| Types of reset 56

14.3| Alarms table 56

15| Parameters 59

Danfoss Electronics spa

Air Handling seq.- user manual

DKRCC.PS.RI.A1.02 / 520H4358 - Air Handling Seq. user manual - V 2.2

Produced by Danfoss Electronics spa Graphic Department, 10-2009

15.1| Parameters table 59

16| Modbus Communication 60

16.1| Table of exported variables 60

17| APPENDIX – Use of the Congurator 67

17.1| Guide to modifying the application software 67

17.2| “Parameters”Page 67

17.3| “Alarms”Page 68

17.4| “Parameters_x_Model”Page 68

17.5| I/O conguration pages 68

DKRCC.PS.RI.A1.02 / 520H4358 - Air Handling Seq. user manual - V 2.2

Produced by Danfoss Electronics spa Graphic Department, 10-2009

Danfoss Electronics spa

Air Handling seq. - user manual

1| Introduction

The algorithm is aimed at controlling the main types of air treatment units.

It can run on the entire line of MCX systems and envisages the use of a remote MMI interface, Modbus

communication and EXC06 expansion.

It can handle the following main functions:

control of heating and cooling coils using PID logic and cascade control;

control of fans according to air pressure using PID logic;

humidity control;

air quality control;

“freecooling”and “freeheating”;

energy recovery;

limiting of supply temperature and humidity;

management of ON/OFF, 3-point, 0/10V valves;

management of ON/OFF and 0/10V dampers;

frost protection.

The type of AHU to be controlled is dened by conguring the parameters and dening the inputs and outputs

to be used to control the various elements that make up the AHU.

Both the parameters and the inputs and outputs can be congured from the instrument user interface or from

a PC using the Congurator software “AHU_Interface_vNN.xls” supplied with the algorithm (see "17] APPENDIX

– Use of the Congurator").*

Note

* In the latter case, it is possible to

generate as many binary

application les as the number of

congurations desired and, after

loading them into the MMIMYK

accessory, select the

conguration to download onto

the MCX on a case-by-case basis.

Danfoss Electronics spa

Air Handling seq.- user manual

DKRCC.PS.RI.A1.02 / 520H4358 - Air Handling Seq. user manual - V 2.2

Produced by Danfoss Electronics spa Graphic Department, 10-2009

2| User interface

2.1| Keyboard

Key Function

Down

Enter

Esc

Keys are used to access directly some special functions and to navigate through the user interface menu.

2.1.1| Direct access to special functions

for 1s: access the alarms screen (see “2.4.1] Displaying and managing alarms”).

for 3s: access the main setpoint (see “6.4] Main setpoint”).

for 1s: access the menu.

for 3s: switch between ON/OFF status (see “2.2] Turning the unit ON and OFF”).

2.1.2| Menu navigation

Press for 1s to access the menu. Use the and keys to navigate through the menu; pressing lets you

descend a level in the menu, if this is possible, and pressing lets you move up a level.

Use the following keys to modify the selected parameters: , to enter the modication mode, and to

modify the value, to conrm the modication and to abandon it without conrming.

2.2| Turning the unit ON and OFF

The instrument can be switched from OFF to ON and vice versa in the following ways:

pressing the key and keeping it pressed for 3s;

using the digital“ONF - ON/OFF” input, if present; remember, the digital input acts on the status change.;*

Note

* if, during the input

conguration phase, you set

“Polarity”=N.C., the unit is OFF

when the input is open;

from a Modbus supervisor through coil 129, (see “16.1] Table of exported variables”).

When OFF, the machine mode is indicated as OFF on the main screen.

Passing from OFF to ON turns on the main screen.

Activating of the digital and analog outputs is delayed, respectively, by the dOt and AOt times

DKRCC.PS.RI.A1.02 / 520H4358 - Air Handling Seq. user manual - V 2.2

Produced by Danfoss Electronics spa Graphic Department, 10-2009

Danfoss Electronics spa

Air Handling seq. - user manual

UNIT ON AND OFF

GEN General Min Max Default U.M. Text value

ODL Out Delay

dOt Digital output delay 0 9999 10 sec

AOt Analog output delay 0 9999 10 sec

Tab.1_[User interface - Unit on and o]

2.3| Main screen

From the main screen, press and keep it pressed for 1 second to access the menu (see ”2.4] Menu-based

navigation”).

Note

*After ve minutes of inactivity,

the main screen is automatically

shown.

The main screen varies depending on whether a LED or LCD display is being used.

2.3.1| LED Display

Fig 1_[User interface - LED display]

Danfoss Electronics spa

Air Handling seq.- user manual

DKRCC.PS.RI.A1.02 / 520H4358 - Air Handling Seq. user manual - V 2.2

Produced by Danfoss Electronics spa Graphic Department, 10-2009

LED DISPLAY

GEN General Min Max Default U.M. Text value

dSP Out Delay

dSA Display A value 1 17 RET ;NO;StH;StC;SUP;REt;OUt;tH1;tH2

;tC1;tC2;bAR;SHU;RHU;OHU;THU

;CO2;VOC

dUA Unit of measure A 1 4 °C ;NO;°C ;RH%;bAR

dSb Display B value 1 17 StH ;NO;StH;StC;SUP;REt;OUt;tH1;tH2

;tC1;tC2;bAR;SHU;RHU;OHU;THU

;CO2;VOC

dUb Unit of measure B 1 4 °C ;NO;°C ;RH%;bAR

Tab 2 _ [User interface -LED display]

Using dSA and dSB, you can choose which setpoint and probe reading values are to be shown on displays A and B

respectively.

dUA and dUb establishes the unit of measure used on the display A and B . The choices are: none, °C, RH%, bar.

The meaning of the icons is indicated in the gure.

The icon associated with a given function follows the trend in activation/deactivation for that function.

2.3.2| LCD Display

The rst screen displays:

the measurement detected by the two analog inputs (see “display

A” and “display B”for the version with LED display);

the symbols of the main active functions (see gure).

Fig 2 _ [User interface - LCD display]

DKRCC.PS.RI.A1.02 / 520H4358 - Air Handling Seq. user manual - V 2.2

Produced by Danfoss Electronics spa Graphic Department, 10-2009

Danfoss Electronics spa

Air Handling seq. - user manual

2.4| Menu-based navigation

Press for 1 second to access the menu described in the table below.

MENU-BASED NAVIGATION

Menu Submenu Submenu Function Notes

LED

code LCD description LED

code LCD description

ALA Alarms Accesses the alarms

AAL Active Lists all currently active

alarms

SAL Historic Presents the alarms

history

RAL Reset Used to reset alarms

that are reset manually

LOG Login Login Species the degree of

access to menus and

parameters.

The password is the

one indicated by the

parameters L01, L02

and L03

PAR Parameters Accesses the

parameters menu You must login rst.

For a description of the

parameters menu, (see

“15 Parameters”)

…. Parameters menu See the Congurator

software AHU_

Interface_vNN.xls

IO Input/Output

IOd I/O Values Displays the input and

output values

IOC I/O Cong Accesses the input/

output conguration

(only if enabled through

the Congurator

Software)

dI Digital Input Conguration of the

digital inputs

dO Digital Output Conguration of the

digital outputs

AI Analog Input Conguration of the

analog inputs

AO Analog Output Conguration of the

analog outputs

UtI Utilities Accesses the utilities

function

COM Commissioning Enable commissioning

screen

DEF Load Default Load default

parameters

RTC Clock Setup Set date and hour Only for models tted

with real time clock

LON Lock Fan Stop and lock fans

LOF Unlock Fan Unlock fans

WIN Winter Sets the winter

operating mode

SUM Summer Sets the summer

operating mode

Tab 3 _ [User interface -Menu-based navigation]

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Air Handling seq.- user manual

DKRCC.PS.RI.A1.02 / 520H4358 - Air Handling Seq. user manual - V 2.2

Produced by Danfoss Electronics spa Graphic Department, 10-2009

Use the and keys to navigate through the menu; pressing lets you descend a level in the menu, if this is

possible, and pressing lets you move up a level.

Use the following keys to modify the selected parameters: , to enter the modication mode, and to

modify the value, to conrm the modication and to abandon it without conrming.

2.4.1| Displaying and managing alarms

Menu: ALA – Alarms

Sub-menu: AAL – Active

Displays the active alarms.

Screen with description of the alarm (LCD), alarm code and number of active alarms.

Note that you can go to the alarm screen pressing the key directly from the main screen.

Each screen is dedicated to a specic alarm. Use the and keys to move from one screen to the next.

Press to reset the alarm currently displayed. To reset all alarms keep pressed for 5 seconds or use the

sub-menu “RAL – Reset”.

Sub-menu: SAL – History

Displays the history of the alarms which are no longer active.

The screens present the alarm code, description (LCD) and duration in days, hours, minutes and seconds.

Each screen is dedicated to a specic alarm. Use the and keys to move from one screen to the next.

Pressing the + keys simultaneously voids the alarms history.

2.4.2| Login

Menu: LOG – Login

Insert the 4-digit password that denes the level of access to the menus and parameters.

Press and to modify the value of the digit selected.

Press to conrm the value and move on to the next digit, if present, or to login.

The LEFT and RIGHT keys, if present, make it possible to move the cursor to the desired digit.

The passwords for access levels 1 through 3 are dened, respectively with parameters L01, L02 and L03.

GEN General Min Max Default U.M. Text value

pas Password

L01 Level 1 0 9999 0

L02 Level 2 0 9999 2000

L03 Level 3 0 9999 3000

Tab 4 _ [User interface - Menu-LOG - Login]

Note

*If you have not logged in, the

access level is 0. This level does not

let you display any parameters

and menus belonging to higher

access levels. The level for a given

menu and the parameters is

dened through the Congurator

software.“AHU_Interface_vNN.xls”.

DKRCC.PS.RI.A1.02 / 520H4358 - Air Handling Seq. user manual - V 2.2

Produced by Danfoss Electronics spa Graphic Department, 10-2009

Danfoss Electronics spa

Air Handling seq. - user manual

2.4.3| Parameters

Menu: PAR - Parameters

Provides access to the parameters.

For a description of the parameters management submenus, (see chapter “15] Parameters”).

2.4.4| Displaying the input/output values

Menu: IO – Input/Output

Sub-menu: IOd – I/O Values

LED Display

The input and output values are displayed in sequence ( and ), indicating the input/output tags on display A

(“AI” for analog inputs; “AO” for analog outputs; “dI” for digital inputs and “dO” for digital outputs) while the value is

shown on display B (analog inputs which are not present or are in alarm mode are indicated with ----).

LCD Display

It is used to call up the three screens that display all inputs and outputs; each screen can display a group of 8 I/O. Use

the and keys to move from one screen to the next. The second and third screens are only for the MCX15 and

MCX20.

Fig 3 _ [Menu-based navigation - Displaying the input&output values]

Sub-menu: IOC – I/O Cong

If enabled through the Congurator software, makes it possible to access the input/output conguration screens.

For each input/output for the instrument, it is possible to set the type, work eld, polarity and function performed.

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