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

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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

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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

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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.
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2| User interface
2.1| Keyboard
Key Function
Up
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
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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]

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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]
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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 LED code LCD description
ALA Alarms Accesses the alarms
menu
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
menu
(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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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.
LOGIN
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”.

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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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2.4.5| Utilities
Menu: UtI – Utilities
Sub-menu: COM – Commissioning
Enable the commissioning screen.
A new screen is enabled with detailed information on the unit status. By pressing the and keys you switch
among the following sets of information
Sub-menu: DEF – Load Default
Load default parameters.
Sub-menu: RTC – Real Time Clock
Sets date and time on models tted with real time clock
Press and to select a eld. Press to start modifying the value. Press and to change the value. Press
to conrm the change or to exit without saving it.
Sub-menu: LON – Lock fan
Stop and lock fans
Sub-menu: LOF – Unlock fan
Unlock fans
Sub-menu: WIN – Winter
Sets the winter operating mode.
Sub-menu: SUM – Summer
Sets the summer operating mode.

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Screens description
MCX screens Values description
DAMPER SEQUENCE Damper Sequence
P B , P % , control probe power out
F C , F H , freecool active set freeheat active set
P 1 , P 2 , changeover probe 1 changeover probe 2
HEATS 1 HEATS 2 Heat Sequence 1 Heat Sequence 2
P B , P B , control probe control probe
S T , S T , active set active set
P % , P % , power out power out
CS1 HUMIDIF. Cool Sequence 1 Humidication
P B , P B , control probe control probe
S T , S T , active set active set
P % , P % , power out power out
SUPPLY LIMITS Supply Limits
T L , H L , supply temp. low limit power supply humidity low limit power
T H , H H , supply temp. high limit power supply humidity high limit power
, , reserved reserved
CASCADE CONTROL Cascade Control
T R , T S , return temperature supply temperature
S H , S H U , return set heat supply set heat
S C , S U C , return set cool supply set cool
DEHUMIDIFICATION Dehumidication
P B , T C , control probe cooling probe
S T , D W, max humidity set dew point
P % , C P % , dehumidication power cool seq. 1 power by dehum
FROST PROTECTION Frost Protection
P B , P B , TC1 probe Control probe
S T , S T , Setpoint OFF Setpoint ON
P % , P % , Antifrost power in OFF Antifrost power
POWER MANAGER [ % ] Power Manager
H 1 P D E H P Heat seq. 1 power Dehumidication power
H 2 P H U MP Heat seq. 2 power Humidication power
C 1 P R E C P Cool seq. 1 power Recovery (Mixing) power
Tab 5 _ [Menu-based navigation - Screen description]

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3| Conguring the AHU software
The type of AHU to be controlled is dened by conguring the parameters described later in the manual 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 (see “2] 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” at the end of this manual).
Fig 4 _ [Conguriong the AHU software- AHU software]
3.1| Conguration overview
The main steps to adapt the AHU software to your application are as follows
Using the Congurator software “AHU_Interface_vNN.xls”dene the input and output you need.
(See “3.2] Input/Output conguration” for the list of all the input and output available).
Temperature control.
Assign a temperature control sequence to each of your heating/cooling coils and the actuator type
(See “4] Coils control).
Two heating sequences and one cooling sequence are available. For each sequence dene the control
probe, the setpoint and the PID control parameters. (See “6.2] Heat and cool control sequences”).
In case of dampers or energy recovery dene their control probe, setpoint and
changeover conditions. (See“6.1] Damper control sequences”).
Humidity control
Dene the control probe, setpoint and the way dehumidication is performed. (See“11] Humidity control”).
Supply limits
Dene the humidity and temperature supply limits which should not be exceeded. (See “10]
Controlling the supply temperature limits”and “11.4] Controlling the supply humidity limits”).
Fans control
Dene the control type, the control probe and if necessary the PID
control parameters. (See“12] Supply and return fans”).
1.
2.
3.
4.
5.
6.

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3.2| Input/Output conguration
Below is a complete list of the functions available; these functions can be assigned independently for each
input/output.
ANALOG INPUTS
Code (LED and LCD) Description (LCD) Function
SUP Supply Temp Supply air temperature
REt Return Temp Return air temperature
OUt Outside Temp Outside air temperature
tH1 Preheat Temp Pre-heating temperature
tH2 Reheat Temp Re-heating temperature
tC1 Cooling Temp Cooling temperature
tC2 AntiFreeze Antifreeze temperature
bAR Air Pressure Air pressure
SHU Sup. Humidity Supply air humidity
RHU Ret. Humidity Return air humidity
CO2 CO2 Air carbon dioxide (CO2) measurement
VOC VOC Air volatile organic compounds (VOC) measurement
Tab 6 _ [Conguring the AHU software - Analog Inputs]
DIGITAL INPUTS
Code (LED and LCD) Description (LCD) Function
ASF SupFan Alarm Supply Fan alarm
SSS SupFan SafeSW Supply Fan safety switch (port open)
ASR RetFan Alarm Return Fan alarm
CSR MixDamp Closed Mixing Damper closed
SSR RetFan SafeSW Return Fan safety switch
CSE ExtDamp Closed External Damper closed
ONF ON/OFF Remote ON/OFF
AFI Fire Alarm Fire alarm
AAI Freeze Alarm Freeze alarm
CH Summer/Winter Summer/Winter selection
SFW Supply Flow Supply ow alarm
RFW Return Flow Return ow alarm
SFI Supply Filter Supply air lter plugged
RFI Return Filter Return air lter plugged
PU1 Coil1 Pump Coil 1 pump alarm
PU2 Coil2 Pump Coil 2 pump alarm
PU3 Coil3 Pump Coil 3 pump alarm
HUM HumidierAlarm Humidier alarm
REC RecoveryAlarm Energy recovery alarm
GEN Generic Alarm Generic alarm
bA1 Coil1 Alarm Coil 1 alarm
bA2 Coil2 Alarm Coil 2 alarm
bA3 Coil3 Alarm Coil 3 alarm
LOF Lock Fan Lock/Unlock fans
COE Comf/Eco Comfort/Economy selection
FDI FreeHeatCool Freeheat/Freecool changeover
Tab 7 _ [Conguring the AHU software - Digital Inputs]

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ANALOG OUTPUTS
Code (LED and LCD) Description (LCD) Function
SUF Supply Fan Supply Fan control
REF Return Fan Return Fan control
RDA Mixing damper Mixing damper control
EDA External Damper External damper control
HUA Humidier Humidier control
bA1 Valve1 Valve 1 control
bA2 Valve2 Valve 2 control
bA3 Valve3 Valve 3 control
DHU Dehumidier Dehumidier control
ERA Recovery Energy recovery control
Tab 8_ [Conguring the AHU software - Analog Outputs]
DIGITAL OUTPUTS
Code (LED and LCD) Description (LCD) Function
ALA Alarm Alarm
WAR Warning Warning
SUF Supply Fan Supply Fan control
REF Return Fan Return Fan control
RDD Mixing Damper Mixing Damper control
EDD External Damper External Damper control
SFL SupplyFanLow Low Supply Fan speed
SFH SupplyFanHigh High Supply Fan speed
RFL ReturnFanLow Low Return Fan speed
RFH ReturnFanHigh High Return Fan speed
dEU Dehumidier External dehumidier control
HUM Humidier External humidier control
HUP HumidPump Humidier pump control
ERD Recovery Energy recovery control
ERP Recovery Pump Energy recovery pump control
b1 Valve1ONOFF Controls the ON/OFF valve of coil 1
b1O Valve1Open Controls opening of 3-point valve of coil 1
b1C Valve1Close Controls closing of 3-point valve of coil 1
b11 Coil1Step1 Controls step 1 of coil 1
b12 Coil1Step2 Controls step 2 of coil 1
b13 Coil1Step3 Controls step 3 of coil 1
CP1 Coil1Pump Coil1 pump control
b2 Valve2ONOFF Controls the ON/OFF valve of coil 2
b2O Valve2Open Controls opening of 3-point valve of coil 2
b2C Valve2Close Controls closing of 3-point valve of coil 2
b21 Coil2Step1 Controls step 1 of coil 2
b22 Coil2Step2 Controls step 2 of coil 2
b23 Coil2Step3 Controls step 3 of coil 2
CP2 Coil2Pump Coil2 pump control
b3 Valve3ONOFF Controls the ON/OFF valve of coil 3
b3O Valve3Open Controls opening of 3-point valve of coil 3
b3C Valve3Close Controls closing of 3-point valve of coil 3

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DIGITAL OUTPUTS
Code (LED and LCD) Description (LCD) Function
b31 Coil3Step1 Controls step 1 of coil 3
b32 Coil3Step2 Controls step 2 of coil 3
b33 Coil3Step3 Controls step 3 of coil 3
CP3 Coil3Pump Coil3 pump control
dEF Defrost Defrost activation
HRE HeatRequest Request of heating
CRE CoolRequest Request of cooling
Tab 9_ [Conguring the AHU software - Digital Outputs]

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4| Coils control
4.1| Assign a control sequence to a coil
There are maximum 3 heating and/or cooling coils composing the AHU.
For each of them it is possible to dene its function through the following parameters.
ASSIGN A CONTROL SEQUENCE TO A COIL
COI Coils Min Max Default U.M. Text value
CL1 Coil 1
b10 Coil 1 function 1 6 HS1 OFF;HS1;HS2;CS1;H1C1;H2C1
CL2 Coil 2
b40 Coil 2 function 1 6 HS2 OFF;HS1;HS2;CS1;H1C1;H2C1
CL3 Coil 3
b70 Coil 3 function 1 6 CS1 OFF;HS1;HS2;CS1;H1C1;H2C1
Tab 10_ [Coils control - Assign a control sequence to a coil]
Possible values are:
OFF. Coil not used
HS1. Heating coil controlled with Heat Sequence 1
HS2. Heating coil controlled with Heat Sequence 2
CS1. Cooling coil controlled with Cool Sequence 1
H1C1. Unique coil for heating or cooling, depending on winter/summer selection.
Heating is controlled with Heat Sequence 1 and cooling with Cool Sequence 1
H2C1. Unique coil for heating or cooling, depending on winter/summer selection.
Heating is controlled with Heat Sequence 2 and cooling with Cool Sequence 1
As described in detail in“6.2| Heat and cool control sequences”, coils are controlled with heating and cooling control
sequences according to the following gure.
Fig 5 _ [Coils control - Heat and cool sequeces for coil]
•
•
•
•
•
•

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Danfoss Electronics spa
Air Handling seq. - user manual
It is possible to congure more coils controlled with the same control sequence. In this case they share equally the
control band.
Example
* Three coils for heating
controlled with Heat Sequence 1;
b10=b40=b70=HS1
Fig 6 _ [Coils control - example heat sequence]
4.2| Coil output management
The following parameters set the way coil output are managed according to the load demand calculated by the
associated temperature control sequences (see “6.2] Heat and cool control sequences”).
COIL OUTPUT MANAGEMENT
COI Coils Min Max Default U.M. Text value
CL1 Coil 1
b11 Actuator 1 type 1 4 VALVE VALVE;LIN STEP;VAR STEP;BIN
STEP
CL2 Coil 2
b41 Actuator 2 type 1 4 LIN STEP VALVE;LIN STEP;VAR STEP;BIN
STEP
CL3 Coil 3
b71 Actuator 3 type 1 4 LIN STEP VALVE;LIN STEP;VAR STEP;BIN
STEP
Tab 10_ [Coils control -Coil output management]
Through b11, b41, b71 you can dene the actuator type for each coil, whether it is a water coil controlled trough a
valve or it is a step controlled coil (e.g. electric resistances). In this case there are 3 possible way of control: linear step
switch, variable step switch binary step switch.

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
19
4.3| Valve control
If b11, b41, b71 = VALVE, coil is a water coil controlled through a valve. The valve can be ON/OFF, 0/10V modulating
or 3 points valve. Depending on the type of valve to be operated, the following outputs are used:
VALVE CONTROL
Coil Type of valve Type of output Output used
Coil1
ON/OFF digital output b1 Valve1ONOFF
0/10V analog output bA1 Coil1
3-points digital output b1O
b1C
Valve1Open to open
Valve1Close to close
Coil2
ON/OFF digital output b2 Valve2ONOFF
0/10V analog output bA2 Coil2
3-points digital output b2O
b2C
Valve2Open to open
Valve2Close to close
Coil3
ON/OFF digital output b3 Valve3ONOFF
0/10V analog output bA3 Coil3
3-points digital output b3O
b3C
Valve3Open to open
Valve3Close to close
Tab 11_ [Coils control - Valve control]
Note
*If one of the above output is
present, then it is automatically
driven by the software, without
the need of enabling it.
4.3.1| ON/OFF and 0/10V valve control
Fig 7 _ [Coils control - ON/OFF and 0/10V valve control]

DKRCC.PS.RI.A1.02 / 520H4358 - Air Handling Seq. user manual - V 2.2
Produced by Danfoss Electronics spa Graphic Department, 10-2009
20
Danfoss Electronics spa
Air Handling seq. - user manual
4.3.2| 3-point valve control
This is a valve with 3 electrical contacts plus the power supply: common, open and close.
The following parameters are used to congure a 3 point valve.
3-POINT VALVE CONTROL
COI Coils Min Max Default U.M. Text value
CL1 Coil 1
b13 Valve full excursion time 0 9999 20 SEC
b14 Valve minimum variation 0 50 2 %
b15 Valve forcing period 0 9999 60 MIN
b16 Valve range 0 50 0 %
CL2 Coil 2
b43 Valve full excursion time 0 9999 20 SEC
b44 Valve minimum variation 0 50 2 %
b45 Valve forcing period 0 9999 60 MIN
b46 Valve range 0 50 0 %
CL3 Coil 3
b73 Valve full excursion time 0 9999 20 SEC
b74 Valve minimum variation 0 50 2 %
b75 Valve forcing period 0 9999 60 MIN
b76 Valve range 0 50 0 %
Tab 12_ [Coils control - 3-Point valve control]
b13, b43, b73 – Valve full excursion time
Indicates the time the valve takes to go from fully closed to fully open. The valve control algorithm uses this time to
calculate the activation time for the outputs“Valve1-2-3 Open” and “Valve1-2-3 Close”.
Depending on the length of time the contact is activated, the extent to which the valve is opened varies from 0%
to 100% of the excursion time. The relays are never activated simultaneously, thus the valves either open, or close,
or remain still
To obviate the lack of feedback that provides exact information on the valve opening step, the following rules
apply:
When the instrument is turned on, the valve is closed or open all the way for an amount of time equal
to the excursion time + 25%, and the position of the valve is realigned before regulation is started.
Whenever the temperature regulation requires opening or closing a valve
all the way, the program increases the opening or closing relay activation
time by 25% to ensure that the valve opens or closes all the way.
b14, b44, b74 – Valve minimum variation
This is the minimum shift performed with the valve.
b15, b45, b75 - Valve forcing period
If the valve is fully open or fully closed, the opening or closing command is periodically sent for a time equal to 25%
of the full excursion time. The frequency of this command is dened in this parameter.
b16, b46, b76 – Valve range
If the valve is commanded to a position lower than this parameter (as a percentage of the fully open or fully closed
position), the valve will open or close all the way.
Example
*b15=5% means that a request
for a 4% position will cause the
valve to fully close and a request
for 96% will cause it to open all
the way.
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