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

Produced by Danfoss Electronics spa Graphic Department, 10-2009

22

Danfoss Electronics spa

Air Handling seq.

 - user manual

4.4.2| 

Variable step switch

If b11, b41, b71 = VAR STEP, coil is step controlled in a variable way. 
When variable step switch is selected, you have to set the number of steps (1..3) for each coil and for each step (of 

each coil) the ON and OFF switching point in % of the load demand

VARIABILE STEP SWITCH
COI

Coils

Min

Max

Default

U.M.

Text value

CL1

Coil 1

b12

Number of steps

0

3

2

b17

Step 1 ON

0

1000

10,0

%

b18

Step 1 OFF

0

1000

20,0

%

b19

Step 2 ON

0

1000

40,0

%

b20

Step 2 OFF

0

1000

30,0

%

b21

Step 3 ON

0

1000

50,0

%

b22

Step 3 OFF

0

1000

100,0

%

CL2

Coil 2

b42

Number of steps

0

3

2

b47

Step 1 ON

0

1000

10,0

%

b48

Step 1 OFF

0

1000

0,0

%

b49

Step 2 ON

0

1000

10,0

%

b50

Step 2 OFF

0

1000

30,0

%

b51

Step 3 ON

0

1000

50,0

%

b52

Step 3 OFF

0

1000

33,0

%

CL3

Coil 3

b72

Number of steps

0

3

2

b77

Step 1 ON

0

1000

17,0

%

b78

Step 1 OFF

0

1000

0,0

%

b79

Step 2 ON

0

1000

33,0

%

b80

Step 2 OFF

0

1000

17,0

%

b81

Step 3 ON

0

1000

50,0

%

b82

Step 3 OFF

0

1000

33,0

%

Tab 15_ [Coils control - Variable step switch]

Содержание MCX08M

Страница 1: ...REFRIGERATION aIR CONDITIONING DIVISION User manual MAKING MODERN LIVING POSSIBLE Danfoss Electronics spa Air handling Seq control algorithm Software version 2 1...

Страница 2: ...ntrol 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...

Страница 3: ...ss 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 Configurator 67 17 1 Guide to modifying the...

Страница 4: ...d 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 contro...

Страница 5: ...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 modification mode and to modify the val...

Страница 6: ...y dOt Digital output delay 0 9999 10 sec AOt Analog output delay 0 9999 10 sec Tab 1_ User interface Unit on and off 2 3 Main screen From the main screen press and keep it pressed for 1 second to acce...

Страница 7: ...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...

Страница 8: ...ameters menu You must login first For a description of the parameters menu see 15 Parameters Parameters menu See the Configurator software AHU_ Interface_vNN xls IO Input Output IOd I O Values Display...

Страница 9: ...u 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 t...

Страница 10: ...nputs 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 Displ...

Страница 11: ...s 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 fitted with re...

Страница 12: ...S 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 Cont...

Страница 13: ...urator software AHU_Interface_vNN xls define the input and output you need See 3 2 Input Output configuration for the list of all the input and output available Temperature control Assign a temperatur...

Страница 14: ...ring 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 Ret...

Страница 15: ...High Supply Fan speed RFL ReturnFanLow Low Return Fan speed RFH ReturnFanHigh High Return Fan speed dEU Dehumidifier External dehumidifier control HUM Humidifier External humidifier control HUP HumidP...

Страница 16: ...manual 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 Coil3Pum...

Страница 17: ...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...

Страница 18: ...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 Actuat...

Страница 19: ...FF 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 bA...

Страница 20: ...me 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 rem...

Страница 21: ...Coil2Step1 Coil2Step2 Coil2Step3 analog output bA2 Coil2 Coil3 digital output b31 b32 b33 Coil3Step1 Coil3Step2 Coil3Step3 analog output bA3 Coil3 Tab 13_ Coils control Step control 4 4 1 Linear step...

Страница 22: ...COI Coils Min Max Default U M Text value CL1 Coil 1 b12 Number of steps 0 3 2 b17 Step 1 ON 0 1000 10 0 b18 Step 1 OFF 0 1000 20 0 b19 Step 2 ON 0 1000 40 0 b20 Step 2 OFF 0 1000 30 0 b21 Step 3 ON 0...

Страница 23: ...3 Binary step switch If b11 b41 b71 LIN STEP coil is step controlled in a binary way When binary step switch is selected you have to set the number of steps 1 3 for each coil BINARY STEP SWITCH COI C...

Страница 24: ...outside temperature measured with the OUT Outside Temp probe goes beyond the following limits LOCKING SEQUENCES COI Coils Min Max Default U M Text value CL1 Coil 1 b29 Cooling lock 40 0 100 0 30 0 C...

Страница 25: ...candefinetheloadpercentage to switch on the pump via PON parameter and to switch it OFF via POF parameter Example Pump switches ON at 5 and OFF at 0 You can also define a switch OFF delay POd for the...

Страница 26: ...REt tH1 OUt HC2 Setpoint 15 0 90 0 14 0 C HC3 Hysteresis 0 1 90 0 12 0 K Tab 20_ Coils control Single Heat Cool coils From the digital input CH Summer Winter if present With input polarity N O when th...

Страница 27: ...ormed according to the value read on the probe selected with dE1 and comparing the reading to setpoint dE2 and hysteresis dE3 If the temperature is lower than the setpoint a defrost output DEF Defrost...

Страница 28: ...ernal damper load demand Pext is calculated by the damper sequence see 6 1 Damper control sequences The mixing damper load demand Pmix is calculated as antagonistic to the external damper Pmix 100 Pex...

Страница 29: ...and Energy recovery control ON OFF dampers 5 1 2 0 10V dampers If dampers are of the modulating type they are controlled by the analog outputs RDA Mixing Damper and EDA External Damper Since their ope...

Страница 30: ...the damper sequence as it is for the mixing damper see 6 1 Damper control sequences It is possible to manage the following output as described in figure ENERGY RECOVERY Type of output Output used dig...

Страница 31: ...ecool offset 20 0 20 0 0 0 K D05 Freeheat offset 20 0 20 0 0 0 K D06 Proportional band 0 1 20 0 10 0 K D07 Changeover probe 1 1 9 OUT NO SUP REt OUt tH1 tH2 tC1 t C2 DI D08 Changeover probe 2 2 9 REt...

Страница 32: ...per freeheating and freecooling They are mutually exclusive 6 1 1 Freecooling Freeheating selection The selection between freecooling or freeheating is obtained in the following ways Assign two probes...

Страница 33: ...REt OUt tH1 tH2 tC1 tC2 H22 Setpoint 1 4 LS1 MAIN CASC LS1 LS2 FRH HS1 H23 Offset 0 0 10 0 0 0 K H24 Proportional band 0 1 20 0 3 0 K H25 Integral time 0 9999 0 SEC H26 Derivative time 0 9999 0 SEC Ta...

Страница 34: ...Department 10 2009 34 Danfoss Electronics spa Air Handling seq user manual Fig 20_ Temperature control sequences Heat sequence 1 Fig 21_ Temperature control sequences Heat sequence 2 Fig 22_ Temperat...

Страница 35: ...ence Possible for all the sequences FRC connection to the Freecool Sequence Possible only for Cool Sequence 1 HS1 connection to the Heat Sequence 1 Possible only for Heat Sequence 2 In the next figure...

Страница 36: ...15 0 90 0 31 0 C TC6 Summer end temperature 15 0 90 0 38 0 C TC7 Summer offset 10 0 10 0 7 0 K Tab 26_ Temperature control sequences Main setpoint The main temperature setpoint are STH for heating an...

Страница 37: ...rresponds to positive values of TC4 TC7 and TC2 TC3 TC5 TC6 Typically the probe used for compensation is the outside probe OUT Outside Temp TC1 OUT and then we can talk about summer and winter compens...

Страница 38: ...t 15 0 90 0 16 0 C TL2 Supply temp high limit 15 0 90 0 35 0 C Tab 28_ Cascade control Cascade control Cascade regulation is used by a sequence when its selected setpoint is CASCADE D02 D03 H12 H22 C1...

Страница 39: ...Dampers control comparing return and outside temperature Fig 28_ Examples Example 1 Dampers D01 control probe tH1 preheat probe D02 freecool setpoint selection FRH connected to the freeheat sequence D...

Страница 40: ...ith cascade control through heating coil cooling coil and dampers Dampers control comparing return and outside temperature Fig 31_ Examples Example 2 Dampers D01 control probe SUP room supply control...

Страница 41: ...ndling 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 41 Fig 32_ Examples RET Return Temperature Fig 33_ E...

Страница 42: ...m setpoint FP2 then the A07 Freeze Alarm is generated and heat power is set to 100 cool power to 0 the external damper goes to its minimum position and the heat recovery is OFF Note The A07 Freeze Ala...

Страница 43: ...for the way supply temperature is limited in the cascade control 10 2 Supply temperature lower limit This function protects the environment and the people therein from the infeed of air that is too c...

Страница 44: ...TL5 and requires setting the upper limit TL2 beyond which the supply temperature must not rise The behavior mirrors what follows for the lower supply limit When the supply temperature SUP Supply Temp...

Страница 45: ...0 40 0 DEH Max setpoint humidity 0 100 0 60 0 Tab 32_ Humidity control Humidity control setpoint HUMIDITY CONTROL REGULATION HCT Humidity Control Min Max Default U M Text value REG Regulation U01 Cont...

Страница 46: ...s controlled by the selected probe with PID logic based on the following setpoint minimum setpoint HUM maximum setpoint DEH Fig 39_ Humidity control Control sequences 11 2 Humidifier control The softw...

Страница 47: ...a switch OFF delay POd for the pumps HUMIDIFICATION PUMPS PUM Pumps Min Max Default U M Text value STU Setup POd Pump delay at OFF 0 9999 5 SEC PON Power request activation 0 9999 5 0 POF Power reques...

Страница 48: ...in dehumidification If U08 NO then cooling coils are not activated regardless of the dehumidification request If U08 YES then cooling coil is activated in the following ways according to U09 Control t...

Страница 49: ...ion load demand Fig 45_ Humidity control Cooling coil in dehumidification 4 11 4 Controlling the supply humidity limits CONTROLLING THE SUPPLY HUMIDITY LIMITS SCT Supply Control Min Max Default U M Te...

Страница 50: ...t HL2 decreased by band HL6 the controller limits the output to the humidifier in a manner proportional to the amount the supply temperature differs from the setpoint limit If the unit has an ON OFF h...

Страница 51: ...Integral time 0 9999 0 SEC Fr5 Derivative time 0 9999 0 SEC Tab 38_ Supply and return fans Supply and return fans The type of supply fan control is defined using parameter F00 The return fan if prese...

Страница 52: ...V Inverse control i e heating Fr1 DIR Direct control i e cooling Fr1 CO1 Direct or inverse control according to the operating mode summer winter Direct in summer inverse in winter Fr1 CO2 Direct or in...

Страница 53: ...n runs at maximum speed F03 In SF2 it is possible to define a percentage speed you wish to avoid because it corresponds to the resonance frequency In this case the fan will avoid speeds that fall betw...

Страница 54: ...l 12 3 Fans and antifreeze In case of water coils and antifreeze alarm is necessary to stop fans Parameter F04 for stopping regulation if FAN is OFF must be set to NO Parameter F05 for stopping FAN if...

Страница 55: ...d 1 10 0 2 0 P05 VOC setpoint 0 100 0 50 0 P06 VOC prop band 1 10 0 2 0 Tab 39_ Air quality control Air quality control Whether requested by the VOC or CO2 probes or set to be performed at certain int...

Страница 56: ...thin the alarms display screen to reset only the currently displayed alarm see 2 User interface If reset is automatic the alarm is deactivated and the signal disappears as soon as the alarm conditions...

Страница 57: ...Pump 1 overload Digital input Coil1 Pump 1 automatic 0 0 0 NO YES YES YES Pump 1 A14 Pump 2 overload Digital input Coil2 Pump 1 automatic 0 0 0 NO YES YES YES Pump 2 A15 Pump 3 overload Digital input...

Страница 58: ...matic 0 20 10 NO YES YES NO Actuators involved E10 Analog Input 10 fault Probe open or short circuited 1 automatic 0 20 10 NO YES YES NO Actuators involved E11 Analog Input 11 fault Probe open or shor...

Страница 59: ...parameter Default factory installed value U M indicates the unit of measure Decimals number of decimal points R W indicates whether the parameter is read only RW 1 or in read write mode RW 0 Visibili...

Страница 60: ...baudrate 1200 baud bAU 24 baudrate 2400 baud bAU 48 baudrate 4800 baud bAU 96 baudrate 9600 baud bAU 144 baudrate 1440 baud bAU 192 baudrate 19200 baud default value bAU 288 baudrate 28800 baud bAU 38...

Страница 61: ...Fan control R 69 RDD Mixing Damper Mixing Damper control R 70 EDD External Damper External Damper control R 71 SFL SupplyFanLow Low Supply Fan speed R 72 SFH SupplyFanHigh High Supply Fan speed R 73...

Страница 62: ...ce State 0 not in alarm mode 1 in alarm mode R 130 Alarms recognized 0 YES 1 NO R 131 Summer Winter 0 Summer 1 Winter R 132 Reserved R 133 Lock Fans 0 Unlocked 1 locked R 134 Frost Protection 0 NO 1 Y...

Страница 63: ...4 fault 0 OFF 1 ON R 203 E05 Analog Input 5 fault 0 OFF 1 ON R 204 E06 Analog Input 6 fault 0 OFF 1 ON R 205 E07 Analog Input 7 fault 0 OFF 1 ON R 206 E08 Analog Input 8 fault 0 OFF 1 ON R 207 E09 Ana...

Страница 64: ...put 7 R 11 Analog input 8 R 12 Analog input 9 R 13 Analog input 10 R 14 Analog input 11 R 15 Analog input 12 R 16 Analog input 13 R 17 Analog input 14 R 18 Analog input 15 R 19 Analog input 16 R 20 An...

Страница 65: ...erature R 9256 bAR Air Pressure Air pressure R 9257 SHU Sup Humidity Supply air humidity R 9258 RHU Ret Humidity Return air humidity R 9259 CO2 CO2 Air carbon dioxide CO2 measurement R 9260 VOC VOC Ai...

Страница 66: ...Power R 16671 Ext Damper Req Power R 16672 Recovery Req Power R 16673 Damper Probe R 16674 Heat1 Probe R 16675 Heat2 Probe R 16676 Cool1 Probe R 16677 Humid Probe R 16678 Frost Probe R 16679 Frost Pr...

Страница 67: ...ers and Parameters_x_Model pages alarms from the Alarms page input and output configuration from the Digital_Input Digital_Output Analog_Input Analog_Output pages For details as to how to make the mod...

Страница 68: ...ameters_x_Model to the Parameters page These will then become the new current values Note On the Parameters page for the parameter values that were automatically copied from the Parameters_x_Model pag...

Страница 69: ...ive probes It is the percentage defining the real working range of the probe Analog input over range admission States if an error is generated when the input signal is outside its effective working ra...

Страница 70: ...control 27 Tab 22_ Coils control Heat Cool request 27 Tab 23_ Dampers and Energy recovery control External and Mixing dampers 28 Tab 24_ Dampers and Energy recovery control Energy recovery 30 Tab 25_...

Страница 71: ...ure control sequences Cool sequence 34 Fig 23_ Temperature control sequences Connection of setpoint sequences 35 Fig 24_ Temperature control sequences Setpoint of Freecool sequence connected to the fr...

Страница 72: ...logues brochures and other printed material Danfoss reserves the right to alter its products without notice This also applies to products already on order provided that such alternations can be made w...

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