Danfoss EKC 202 User Manual

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Controller for temperature control

- EKC 202

Manual

2 Manual RS8DZ602 © Danfoss 08-2010 EKC 202

Introduction

Application

• The controller is used for temperature control refrigeration appliances and cold room in supermarkets

• Control of defrost, fans, alarm and light

• For front panel mounting

Principle

The controller contains a temperature control where the signal can be received from one temperature sensor. The sensor is placed in the cold air ow after the evaporator or in the warm air ow just before the evaporator. The controller controls the defrost with either natural defrost or electric defrost. Renewed cutin after defrost can be accomplished based on time or temperature. A measurement of the defrost temperature can be obtained directly through the use of a defrost sensor. Two to four relays will cut the required functions in and out – the application determines which:

• Refrigeration (compressor or solenoid valve)

• Defrost

• Fan

• Alarm

• Light

The dierent applications are described on next page.

Advantages

• Integrated refrigeration-technical functions

• Defrost on demand in 1:1 systems

• Buttons and seal imbedded in the front

• IP65 density from the front panel

• Digital input for either:

- Door contact function with alarm

- Defrost start

- Start/stop of regulation

- Night operation

- Change-over between two temperature reference

- Case cleaning function

• Instant programming via programming key

• HACCP Factory calibration that will guarantee a better measuring accuracy than stated in the standard EN 441-13 without subsequent calibration (Pt 1000 ohm sensor)

Extra module

• The controller can afterwards be tted with an insertion module

if the application requires it. The controller has been prepared with plug, so the module simply has to be pushed in

- Battery and buzzer module

The module guarantees voltage to the controller if the supply voltage should drop out for more than four hours. The clock function can thus be protected during a power failure.

- Data communication

If you require operation from a PC, a data communication module has to be placed in the controller.

- Coordinated defrost via data communication

Contents

Introduction ....................................................................................................... 2

Operation ............................................................................................................ 5

Menu survey .......................................................................................................6

Functions .............................................................................................................8

Connections .....................................................................................................14

Data .....................................................................................................................15

Ordering ............................................................................................................16

EKC 202 Manual RS8DZ602 © Danfoss 08-2010 3

EKC 202A

Controller with two relay outputs, two temperature sensors and digital input.

Temperature control at start/stop of compressor / solenoid valve Defrost sensor Electrical defrost / gas defrost

EKC 202B

Controller with three relay outputs, two temperature sensors and digital input.

Temperature control at start/stop of compressor / solenoid valve Defrost sensor Electrical defrost / gas defrost Relay output 3 is used for control of fan.

EKC 202C

Controller with four relay outputs, two temperature sensors and digital input.

Temperature control at start/stop of compressor / solenoid valve Defrost sensor Electrical defrost / gas defrost Control of fan

Relay output 4 can be used for an alarm function or for a light function.

Alarm function If an alarm function is required, relay number two may be used for it. Defrost is performed here with circulation of the air as the fans are operating continuously.

4 Manual RS8DZ602 © Danfoss 08-2010 EKC 202

Start of defrost

A defrost can be started in dierent ways Interval: Defrost is started at xed time intervals, say, every eight hour Refrigeration time: Defrost is started at xed refrigeration time inter- vals, in other words, a low need for refrigeration will ”postpone” the coming defrost Contact Defrost is started here with a pulse signal on a

digital input. Manual: An extra defrost can be activated from the control ler’s lower-most button S5-temp. In 1:1 systems the eciency of the evaporator can

be followed. Icing-up will start a defrost. Schedule Defrost here can be started at xed times of the

day and night. But max. six defrosts Network A defrost can be started via data communication All the mentioned methods can be used at random – if just one them is activated a defrost will be started. When the defrost starts the defrost timers are set at zero

Digital input

The digital input can be used for the following functions:

- Door contact function with alarm if the door has been open for

too long.

- Defrost start

- Start/stop of regulation

- Change-over to night operation

- Case cleaning

- Change to another temperature reference

- Inject on/o

Case cleaning function

This function makes it easy to steer the refrigeration appliance through a cleaning phase. Via three pushes on a switch you change from one phase to the next phase. The rst push stops the refrigeration – the fans keep working ”Later”: The next push stops the fans ”Still later”: The next push restarts refrigeration The dierent situations can be followed on the display.

There is no temperature monitoring during case cleaning.

On the network a cleaning alarm is transmitted to the system unit. This alarm can be ”logged” so that proof of the sequence of events is provided.

Defrost on demand

1 Based on refrigeration time

When the aggregate refrigeration time has passed a xed time, a defrost will be started.

2 Based on temperature

The controller will constantly follow the temperature at S5. Between two defrosts the S5 temperature will become lower the more the evaporator ices up (the compressor operates for a longer time and pulls the S5 temperature further down). When the temperature passes a set allowed variation the defrost will be started.

This function can only be used in 1:1 systems

A pulse signal starts the defrost

- + + °C

1 ÷ + Fan

2 ÷ ÷ O

3 + + °C

EKC 202 Manual RS8DZ602 © Danfoss 08-2010 5

Light-emitting diodes (LED) on front panel

There are LED’s on the front panel which will light up when the belonging relay is activated.

= Refrigeration = Defrost = Fan

The light-emitting diodes will ash when there is an alarm. In this situation you can download the error code to the display and cancel/sign for the alarm by giving the top button a brief push.

Defrost

During defrost a –d– is shown in the display. This view will continue up till 15 min. after the cooling has resumed. However the view of –d– will be discontinued if:

- The temperature is suitable within the 15 minutes

- The regulation is stopped with “Main Switch”

- A high temperature alarm appears

The buttons

When you want to change a setting, the upper and the lower buttons will give you a higher or lower value depending on the button you are pushing. But before you change the value, you must have access to the menu. You obtain this by pushing the upper button for a couple of seconds - you will then enter the column with parameter codes. Find the parameter code you want to change and push the middle buttons until value for the parameter is shown. When you have changed the value save the new value by once more pushing the middle button

Display The values will be shown with three digits, and with a setting you can determine whether the temperature are to be shown in °C or in °F.

Operation

Examples

Set menu

1. Push the upper button until a parameter r01 is shown

2. Push the upper or the lower button and nd that parameter you want to change

3. Push the middle button until the parameter value is shown

4. Push the upper or the lower button and select the new value

5. Push the middle button again to enter the value.

Cutout alarm relay / receipt alarm/see alarm code

• Push briey the upper button

If there are several alarm codes they are found in a rolling stack. Push the uppermost or lowermost button to scan the rolling stack.

Set temperature

1. Push the middle button until the temperature value is shown

2. Push the upper or the lower button and select the new value

3. Push the middle button to select the setting

Manuel start or stop of a defrost

• Push the lower button for four seconds.

See the temperature at the defrost sensor

• Push briey the lower button

If no sensor has been mounted, ”non” will appear.

100% tight

The buttons and the seal are imbedded in the front. A special moulding technique unites the hard front plastic, the softer buttons and the seal, so that they become an integral part of the front panel. There are no openings that can receive moisture or dirt.

6 Manual RS8DZ602 © Danfoss 08-2010 EKC 202

Menu survey

SW = 1.3x

Parameters Controller

Min.value

Max.value

Factory setting

Actual

setting

Function Codes

EKC

202A

EKC

202B

EKC

202C

Normal operation

Temperature (set point) --- -50°C 50°C 2°C

Thermostat

Dierential r01 0,1 K 20 K 2 K Max. limitation of setpoint setting r02 -49°C 50°C 50°C Min. limitation of setpoint setting r03 -50°C 49°C -50°C Adjustment of temperature indication r04 -20 K 20 K 0.0 K Temperature unit (°C/°F) r05 °C °F °C Correction of the signal from Sair r09 -10 K 10 K 0 K Manual service(-1), stop regulation(0), start regulation (1) r12 -1 1 1 Displacement of reference during night operation r13 -10 K 10 K 0 K Activation of reference displacement r40 r39 OFF on OFF Value of reference displacement (activation by r39 or DI) r40 -50 K 50 K 0 K

Alarm

Delay for temperature alarm A03 0 min 240 min 30 min Delay for door alarm A04 0 min 240 min 60 min Delay for temperature alarm after defrost A12 0 min 240 min 90 min High alarm limit A13 -50°C 50°C 8°C Low alarm limit A14 -50°C 50°C -30°C Alarm delay DI1 A27 0 min 240 min 30 min High alarm limit for condenser temperature (o70) A37 0°C 99°C 50°C

Compressor

Min. ON-time c01 0 min 30 min 0 min Min. OFF-time c02 0 min 30 min 0 min Compressor relay must cutin and out inversely (NC-function) c30 0 / OFF 1 / on 0 / OFF

Defrost

Defrost method (none/EL/gas) d01 no gas EL Defrost stop temperature d02 0°C 25°C 6°C Interval between defrost starts d03 0 hours 48 hours 8 hours Max. defrost duration d04 0 min 180 min 45 min Displacement of time on cutin of defrost at start-up d05 0 min 240 min 0 min Drip o time d06 0 min 60 min 0 min Delay for fan start after defrost d07 0 min 60 min 0 min Fan start temperature d08 -15°C 0°C -5°C Fan cutin during defrost

0: Stopped 1: Running 2: Running during pump down and defrost

d09 0 2 1

Defrost sensor (0=time, 1=S5, 2=Sair) d10 0 2 0 Max. aggregate refrigeration time between two defrosts d18 0 hours 48 hours 0 hours Defrost on demand - S5 temperature’s permitted variation during frost build-up. On central plant choose 20 K (=o)

d19 0 K 20 K 20 K

Fans

Fan stop at cutout compressor F01 no yes no Delay of fan stop F02 0 min 30 min 0 min Fan stop temperature (S5) F04 -50°C 50°C 50°C

Real time clock

Six start times for defrost. Setting of hours. 0=OFF

t01-t06 0 hours 23 hours 0 hours

Six start times for defrost. Setting of minutes. 0=OFF

t11-t16 0 min 59 min 0 min

Clock - Setting of hours t07 0 hours 23 hours 0 hours Clock - Setting of minute t08 0 min 59 min 0 min Clock - Setting of date t45 1 31 1 Clock - Setting of month t46 1 12 1 Clock - Setting of year t47 0 99 0

Miscellaneous

Delay of output signals after start-up o01 0 s 600 s 5 s Input signal on DI1. Function: 0=not used. 1=status on DI1. 2=door function with alarm when open. 3=door alarm when open. 4=defrost start (pulse-pressure). 5=ext.main switch. 6=night operation 7=change reference (r40 will be activated) 8=alarm function when closed. 9=alarm function when open. 10=case cleaning (pulse pressure). 11=Inject o when open.

o02 0 11 0

Network address o03 0 240 0 On/O switch (Service Pin message) o04 OFF ON OFF Access code 1 (all settings) o05 0 100 0 Used sensor type (Pt /PTC/NTC) o06 Pt ntc Pt Display step = 0.5 (normal 0.1 at Pt sensor) o15 no yes no Max hold time after coordinated defrost o16 0 min 60 min 20 Conguration of light function (relay 4) 1=ON during day operation. 2=ON / OFF via data communication. 3=ON follows the DIfunction, when DI is selected to door function or to door alarm

o38 1 3 1

Activation of light relay (only if o38=2) o39 OFF ON OFF Case cleaning. 0=no case cleaning. 1=Fans only. 2=All output O. o46 0 2 0 Access code 2 (partly access) o64 0 100 0 Save the controllers present settings to the programming key. Select your own number. o65 0 25 0

EKC 202 Manual RS8DZ602 © Danfoss 08-2010 7

Start-up:

Regulation starts when the voltage is on.

1 Go through the survey of factory settings. Make any necessary changes

in the respective parameters.

2 For network. Set the address in o03 and then transmit it to the gateway/

system unit with setting o04.

Load a set of settings from the programming key (previously saved via o65 function) o66 0 25 0 Replace the controllers factory settings with the present settings o67 OFF On OFF Re alternative application for the S5 sensor (maintain the setting at 0 if it is used as

defrost sensor, otherwise 1 = product sensor and 2 = condenser sensor with alarm)

o70 0 2 0

Select application for relay 4: 1=defrost/light, 2= alarm o72 defrost /

Alarm

Light / Alarm

1 2 2

Service

Temperature measured with S5 sensor u09 Status on DI1 input. on/1=closed u10 Status on night operation (on or o) 1=closed u13 Read the present regulation reference u28 Status on relay for cooling (Can be controlled manually, but only when r12=-1) u58 Status on relay for fans (Can be controlled manually, but only when r12=-1) u59 Status on relay for defrost. (Can be controlled manually, but only when r12=-1) u60 Temperature measured with Sair sensor u69 Status on relay 4 (alarm, defrost, light).(Can be controlled manually, but only when r12=-1)

u71

Fault code display Alarm code display Status code display

E1 Fault in controller A 1 High temperature alarm S0 Regulating E6 Change battery + check clock A 2 Low temperature alarm S1 Waiting for end of the coordinated defrost E 27 S5 sensor error A 4 Door alarm S2 ON-time Compressor

E 29 Sair sensor error A 5 Max. Hold time S3 OFF-time Compressor

A 15 DI 1 alarm S4 Drip-o time A 45 Standby mode S10 Refrigeration stopped by main switch A 59 Case cleaning S11 Refrigeration stopped by thermostat A 61 Condenser alarm S14 Defrost sequence. Defrosting

S15 Defrost sequence. Fan delay S16 Refrigeration stopped because of open DI

input

S17 Door open (open DI input) S20 Emergency cooling

S25 Manual control of outputs S29 Case cleaning S32 Delay of output at star t-up non The defrost temperature cannot be dis-

played. There is stop based on time

-d- Defrost in progress / First cooling after defrost

PS Password required. Set password

Factory setting If you need to return to the factory-set values, it can be done in this way:

- Cut out the supply voltage to the controller

- Keep upper and lower button depressed at the same time as you recon nect the supply voltage

8 Manual RS8DZ602 © Danfoss 08-2010 EKC 202

Functions

Here is a description of the individual functions. A controller only contains this part of the functions. Cf. the menu survey.

Function Para-

meter

Parameter by operation via data communication

Normal display

Normally the temperature value from thermostat sensor Sair is displayed. Display air (u69)

Thermostat Thermostat control

Set point

Regulation is based on the set value plus a displacement, if applicable. The value is set via a push on the centre button. The set value can be locked or limited to a range with the settings in r02 and r 03. The reference at any time can be seen in ”u28 Temp. ref”

Cutout °C

Diﬀerential

When the temperature is higher than the reference + the set dierential, the compressor relay will be cut in. It will cut out again when the temperature comes down to the set reference.

r01 Dierential

Setpoint limitation

The controller’s setting range for the setpoint may be narrowed down, so that much too high or much too low values are not set accidentally - with resulting damages.

To avoid a too high setting of the setpoint, the max. allowable reference value must be lowered. r02 Max cutout °C

To avoid a too low setting of the setpoint, the min. allowable reference value must be increased. r03 Min cutout °C

Correction of the display’s temperature showing

If the temperature at the products and the temperature received by the controller are not identical, an oset adjustment of the shown display temperature can be carried out.

r04 Disp. Adj. K

Temperature unit

Set here if the controller is to show temperature values in °C or in °F.

r05 Temp. unit

°C=0. / °F=1 (Only °C on AKM, whatever the setting)

Correction of signal from Sair

Compensation possibility through long sensor cable

r09 Adjust Sair

Start / stop of refrigeration

With this setting refrigeration can be started, stopped or a manual override of the outputs can be allowed. Start / stop of refrigeration can also be accomplished with the external switch function connected to the DI input. Stopped refrigeration will give a ”Standby alarm”.

r12 Main Switch

1: Start 0: Stop

-1: Manual control of outputs allowed

Night setback value

The thermostat’s reference will be the setpoint plus this value when the controller changes over to night operation. (Select a negative value if there is to be cold accumulation.)

r13 Night oset

Activation of reference displacement

When the function is changed to ON the thermostat dierential will be increased by the value in r40. Activation can also take place via input DI (dened in o02).

r39 Th. oset

Value of reference displacement

The thermostat reference and the alarm values are shifted the following number of degrees when the displacement is activated. Activation can take place via r39 or input DI

r40 Th. oset K

Night setbck (start of night signal)

Alarm Alarm settings

The controller can give alarm in dierent situations. When there is an alarm all the light-emitting diodes (LED) will ash on the controller front panel, and the alarm relay will cut in.

With data communication the importance of the individual alarms can be dened. Setting is carried out in the “Alarm destinations” menu.

Ref. Dif.

EKC 202 Manual RS8DZ602 © Danfoss 08-2010 9

Alarm delay (short alarm delay) If one of the two limit values is exceeded, a timer function will commence. The alarm will not become active until the set time delay has been passed. The time delay is set in minutes.

A03 Alarm delay

Time delay for door alarm

The time delay is set in minutes. The function is dened in o02.

A04 DoorOpen del

Time delay for cooling (long alarm delay) This time delay is used during start-up, during defrost, immediately after a defrost. There will be change-over to the normal time delay (A03) when the temperature has dropped below the set upper alarm limit. The time delay is set in minutes.

A12 Pulldown del

Upper alarm limit

Here you set when the alarm for high temperature is to start. The limit value is set in °C (absolute value). The limit value will be raised during night operation. The value is the same as the one set for night setback, but will only be raised if the value is positive. The limit value will also be raised in connection with reference displacement r39.

A13 HighLim Air

Lower alarm limit

Here you set when the alarm for low temperature is to start. The limit value is set in °C (absolute value). The limit value will also be raised in connection with reference displacement r39.

A14 LowLim Air

Delay of a DI alarm

A cut-out/cut-in input will result in alarm when the time delay is passed. The function is dened in o02.

A27 AI.Delay DI

High alarm limit for condenser temperature

If the S5 sensor is used for monitoring the condenser’s temperature you must set the value at which the alarm is to become activated. The value is set in °C. The denition of S5 as condenser sensor is accomplished in o70. The alarm is zeroset again 10 K below the set temperature.

A37 Condtemp Al.

Reset alarm

Compressor Compressor control

The compressor relay works in conjunction with the thermostat. When the thermostat calls for refrigeration will the compressor relay be operated.

Running times

To prevent irregular operation, values can be set for the time the compressor is to run once it has been started. And for how long it at least has to be stopped. The running times are not observed when defrosts start.

Min. ON-time (in minutes) c01 Min. On time

Min. OFF-time (in minutes) c02 Min. O time

Reversed relay function for compressor relay

0: Normal function where the relay cuts in when refrigeration is demanded 1: Reversed function where the relay cuts out when refrigeration is demanded (this wiring pro-

duces the result that there will be refrigeration if the supply voltage to the controller fails).

c30 Cmp relay NC

Defrost Defrost control

The controller contains a timer function that is zeroset after each defrost start. The timer function will start a defrost if/when the interval time is passed. The timer function starts when voltage is connected to the controller, but it is displaced the rst time by the setting in d05. If there is power failure the timer value will be saved and continue from here when the power returns. This timer function can be used as a simple way of starting defrosts, but it will always act as safety defrost if one of the subsequent defrost starts is not received. The controller also contains a real-time clock. By means of settings of this clock and times for the required defrost times, defrost can be started at xed times of the day. If there is a risk of power failure for periods longer than four hours, a battery module should be mounted in the controller. Defrost start can also be accomplished via data communication, via contact signals or manual start-up.

All starting methods will function in the controller. The dierent functions have to be set, so that defrosts do not ”come tumbling” one after the other. Defrost can be accomplished with electricity, hotgas or brine. The actual defrost will be stopped based on time or temperature with a signal from a temperature sensor.

Defrost method

Here you set whether defrost is to be accomplished with electricity or "non". During defrost the defrost relay will be cut in. When gas defrosting the compressor relay will be cut in during defrost.

d01 Def. method

Defrost stop temperature

The defrost is stopped at a given temperature which is measured with a sensor (the sensor is dened in d10). The temperature value is set.

d02 Def. Stop Temp

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Interval between defrost starts

The function is zeroset and will start the timer function at each defrost start. When the time has expired the function will start a defrost. The function is used as a simple defrost start, or it may be used as a safeguard if the normal signal fails to appear. If master/slave defrost without clock function or without data communication is used, the interval time will be used as max. time between defrosts. If a defrost start via data communication does not take place, the interval time will be used as max. time between defrosts. When there is defrost with clock function or data communication, the interval time must be set for a somewhat longer period of time than the planned one, as the interval time will otherwise start a defrost which a little later will be followed by the planned one. In connection with power failure the interval time will be maintained, and when the power returns the interval time will continue from the maintained value. The interval time is not active when set to 0.

d03 Def Interval

(0=o)

Max. defrost duration

This setting is a safety time so that the defrost will be stopped if there has not already been a stop based on temperature or via coordinated defrost. (The setting will be the defrost time if d10 is selected to be 0)

d04 Max Def. time

Time staggering for defrost cutins during start-up

The function is only relevant if you have several refrigeration appliances or groups where you want the defrost to be staggered in relation to one another. The function is furthermore only relevant if you have chosen defrost with interval start (d03). The function delays the interval time d03 by the set number of minutes, but it only does it once, and this at the very rst defrost taking place when voltage is connected to the controller. The function will be active after each and every power failure.

d05 Time Stagg.

Drip-oﬀ time

Here you set the time that is to elapse from a defrost and until the compressor is to start again. (The time when water drips o the evaporator).

d06 DripO time

Delay of fan start after defrost

Here you set the time that is to elapse from compressor start after a defrost and until the fan may start again. (The time when water is “tied” to the evaporator).

d07 FanStartDel

Fan start temperature

The fan may also be started a little earlier than mentioned under “Delay of fan start after defrost”, if the defrost sensor S5 registers another allowable value than the one set here.

d08 FanStartTemp

Fan cut in during defrost

Here you can set whether fan is to operate during defrost. 0: Stopped (Runs during pump down) 1: Running (stopped during "fan delay") 2: Running during pump down and defrost. After that stopped

d09 FanDuringDef

Defrost sensor

Here you dene the defrost sensor. 0: None, defrost is based on time 1: S5 2: Sair

d10 DefStopSens.

Defrost on demand – aggregate refrigeration time

Set here is the refrigeration time allowed without defrosts. If the time is passed, a defrost will be started. With setting = 0 the function is cut out.

d18 MaxTherRunT

Defrost on demand – S5 temperature

The controller will follow the eectivity of the evaporator, and via internal calculations and measurements of the S5 temperature it will be able to start a defrost when the variation of the S5 temperature becomes larger than required. Here you set how large a slide of the S5 temperature can be allowed. When the value is passed, a defrost will start. The function can only be used in 1:1 systems when the evaporating temperature will become lower to ensure that the air temperature will be maintained. In central systems the function must be cut out. With setting = 20 the function is cut out

d19 CutoutS5Dif.

If you wish to see the temperature at the S5 sensor, push the controller’s lowermost button. Defrost temp.

If you wish to start an extra defrost, push the controller’s lowermost button for four seconds. You can stop an ongoing defrost in the same way

Def Start Here you can start a manual defrost.

Hold After Def Shows ON when the controller is operating with coordinated defrost.

Defrost State Status on defrost 1= pump down / defrost

EKC 202 Manual RS8DZ602 © Danfoss 08-2010 11

Fan Fan control

Fan stopped at cut-out compressor

Here you can select whether the fan is to be stopped when the compressor is cut out

F01 Fan stop CO

(Yes = Fan stopped)

Delay of fan stop when compressor is cut out

If you have chosen to stop the fan when the compressor is cut out, you can delay the fan stop when the compressor has stopped. Here you can set the time delay.

F02 Fan del. CO

Fan stop temperature

The function stops the fans in an error situation, so that they will not provide power to the appliance. If the defrost sensor registers a higher temperature than the one set here, the fans will be stopped. There will be re-start at 2 K below the setting. The function is not active during a defrost or start-up after a defrost. With setting +50°C the function is interrupted.

F04 FanStopTemp.

Real-time clock

The controller can accommodate one insertion module which may either be a data communication module or a battery module for the real-time clock. The battery module is used in conjunction with the real-time clock and will keep the clock going during lengthy power failures.

(Times cannot be set via data communication. Settings are only relevant when there is no data communication).

Real-time clock

You can set up to six individual times for defrost starts for each 24-hour period. There is also a date indication used for registration of temperature measurements.

Defrost start, hour setting t01-t06

Defrost start, minute setting (1 and 11 belong together, etc.) When all t01 to t16 equal 0 the clock will not start defrosts.

t11-t16

Clock: Hour setting t07

Clock: Minute setting t08

Clock: Date setting t45

Clock: Month setting t46

Clock: Year setting t47

Miscellaneous Miscellaneous

Delay of output signal after start-up

After start-up or a power failure the controller’s functions can be delayed so that overloading of the electricity supply network is avoided. Here you can set the time delay.

o01 DelayOfOutp.

Digital input signal - DI

The controller has a digital input which can be used for one of the following functions: O: The input is not used

1) Status display of a contact function

2) Door function. When the input is open it signals that the door is open. The refrigeration and the fans are stopped. When the time setting in “A04” is passed, an alarm will be given and refrigeration will be resumed.

3) Door alarm. When the input is open it signals that the door is open. When the time setting in “A04” is passed, there will be alarm.

4) Defrost. The function is started with a pulse pressure. The controller will register when the DI input is activated. The controller will then start a defrost cycle. If the signal is to be received by several controllers it is important that ALL connections are mounted the same way (DI to DI and GND to GND).

5) Main switch. Regulation is carried out when the input is short-circuited, and regulation is stopped when the input is put in pos. OFF.

6) Night operation. When the input is short-circuited, there will be regulation for night operation.

7) Reference displacement when DI1 is short-circuited. Displacement with “r40”.

8) Separate alarm function. Alarm will be given when the input is short-circuited.

9) Separate alarm function. Alarm will be given when the input is opened. (For 8 and 9 the time delay is set in A27)

10) Case cleaning. The function is started with a pulse pressure. Cf. also description on page 4.

11) Inject on/o. O when DI is open.

o02 DI 1 Cong.

Denition takes place with the numerical value shown to the left. (0 = o)

DI state (Measurement) The DI input’s present status is shown here. ON or OFF.

Address

If the controller is built into a network with data communication, it must have an address, and the master gateway of the data communication must then know this address. These settings can only be made when a data communication module has been mounted in the controller and the installation of the data communication cable has been nished. This installation is mentioned in a separate document “RC8AC”.

After installation of a data communication module the controller can be operated on an equal footing with the other controllers in ADAP-KOOL® refrigeration controls.

The address is set between 1 and 240, gateway determined o03

The address is sent to the gateway when the menu is set in pos. ON o04

Access code 1 (Access to all settings)

If the settings in the controller are to be protected with an access code you can set a numerical value between 0 and 100. If not, you can cancel the function with setting 0. (99 will always give you access).

o05 -

12 Manual RS8DZ602 © Danfoss 08-2010 EKC 202

Sensor type

Normally a Pt 1000 sensor with great signal accuracy is used. But you can also use a sensor with another signal accuracy. That may either be a PTC sensor (1000 ohm at 25°C) or an NTC sensor (5000 Ohm at 25°C). All the mounted sensors must be of the same type.

o06 SensorCong

Pt = 0 PTC = 1 NTC = 2

Display step

Yes: Gives steps of 0.5° No: Gives steps of 0.1°

o15 Disp. Step = 0.5

Max. standby time after coordinated defrost When a controller has completed a defrost it will wait for a signal which tells that the refrigeration may be resumed. If this signal fails to appear for one reason or another, the controller will itself start the refrigeration when this standby time has elapsed.

o16 Max HoldTime

Conﬁguration of light function

1) The relay cuts in during day operation

2) The relay to be controlled via data communication

3) The relay to be controlled by the door switch dened in either o02 where the setting is selected to either 2 or 3. When the door is opened the relay will cut in. When the door is closed again there will be a time delay of two minutes before the light is switched o.

o38 Light cong

Activation of light relay

The light relay can be activated here (if 038=2)

o39 Light remote

Case cleaning

The status of the function can be followed here or the function can be started manually.

0 = Normal operation (no cleaning) 1 = Cleaning with fans operating. All other outputs are O. 2 = Cleaning with stopped fans. All outputs are O.

If the function is controlled by a signal at the DI input, the relevant status can be seen here in the menu.

o46 Case clean

Access code 2 (Access to adjustments)

There is access to adjustments of values, but not to conguration settings. If the settings in the controller are to be protected with an access code you can set a numerical value between 0 and

100. If not, you can cancel the function with setting 0. If the function is used, access code 1 (o05) must also be used.

o64 -

Copy the controller’s present settings

With this function the controller’s settings can be transferred to a programming key. The key can contain up to 25 dierent sets. Select a number. All settings except for Address (o03) will be copied. When copying has started the display returns to o65. After two seconds you can move into the menu again and check whether the copying was satisfactory. Showing of a negative gure spells problems. See the signicance in the Fault Message section.

o65 -

Copy from the programming key

This function downloads a set of settings earlier saved in the controller. Select the relevant number. All settings except for Address (o03) will be copied. When copying has started the display returns to o66. After two seconds you can move back into the menu again and check whether the copying was satisfactory. Showing of a negative gure spells problems. See the signicance in the Fault Message section.

o66 -

Save as factory setting

With this setting you save the controller’s actual settings as a new basic setting (the earlier factory settings are overwritten).

o67 -

Other application for S5 sensor

Maintain the setting at 0 if the sensor has been dened as defrost sensor in D10. If D10 has been set at 0 or 2 the S5 input can be used as product sensor or condenser sensor. Here you dene which: 0: Defrost sensor 1: Product sensor 2: Condenser sensor with alarm

o70 S5 Cong

Relay 4

Here you dene the application for relay 4: 1: Defrost (EKC 202A) or Light (EKC 202C) 2: Alarm

o72 DO4 Cong

- - - Night Setback 0=Day 1=Night

Service Service

Temperature measured with S5 sensor u09 S5 temp.

Status on DI input. on/1=closed u10 DI1 status

Status on night operation (on or o) 1=closed

u13 Night Cond.

Read the present regulation reference u28 Temp. ref.

* Status on relay for cooling

u58 Comp1/LLSV

* Status on relay for fan

u59 Fan relay

* Status on relay for defrost

u60 Def. relay

* Temperature measured with Sair sensor u69 Sair temp

* Status on relay 4 (alarm, defrost or light function) u71 DO4 status

*) Not all items will be shown. Only the function belonging to the selected application can be

seen.

Fault message Alarms

In an error situation the LED’s on the front will ash and the alarm relay will be activated. If you push the top button in this situation you can see the alarm report in the display. If there are further push again to see them. There are two kinds of error reports - it can either be an alarm occurring during the daily operation, or there may be a defect in the installation. A-alarms will not become visible until the set time delay has expired. E-alarms, on the other hand, will become visible the moment the error occurs. (An A alarm will not be visible as long as there is an active E alarm). Here are the messages that may appear: 1 = alarm

A1: High temperature alarm High t. alarm

A2: Low temperature alarm Low t. alarm

A4: Door alarm Door Alarm

A5: Information. Parameter o16 is expired Max Hold Time

A15: Alarm. Signal from DI input DI1 alarm

A45: Standby position (stopped refrigeration via r12 or DI input) Standby mode

A59: Case cleaning. Signal from DI input Case cleaning

A61: Condenser alarm Cond. alarm

E1: Faults in the controller EKC error

E6: Fault in real-time clock. Check the battery / reset the clock. -

E27: Sensor error on S5 S5 error

E29: Sensor error on Sair Sair error

When copying settings to or from a copying key with functions o65 or o66, the following information may appear: 0: Copying concluded and OK 4: Copying key not correctly mounted 5: Copying was not correct. Repeat copying 6: Copying to EKC incorrect. Repeat copying 7: Copying to copying key incorrect. Repeat copying 8: Copying not possible. Order number or SW version do not match 9: Communication error and timeout 10: Copying still going on (The information can be found in o65 or o66 a couple of seconds after copying has been started).

Alarm destinations

The importance of the individual alarms can be dened with a setting (0, 1, 2 or 3)

Warning ! Direct start of compressors * To prevent compressor breakdown parameter c01 and c02 should be set according to suppliers requirements or in general : Hermetic Compressors c02 min. 5 minutes Semihermetic Compressors c02 min. 8 minutes and c01 min. 2 to 5 minutes ( Motor from 5 to 15 KW ) * ) Direct activating of solenoid valves does not require settings dierent from factory (0)

Connections

Power supply

230 V a.c.

Sensors

Sair is thermostat sensors. S5 is a defrost sensor and is used if defrost has to be stopped based on temperature. It may however also be used as product sensor or condenser sensor.

Digital On/Oﬀ signal

A cut-in input will activate a function. The possible functions are described in menu o02.

EKC 202A

Relays

The general connections are: Refrigeration. The contact will cut in when the controller demands refrigeration

Defrost. Fan. Alarm. The relay is cut out during normal operation and cuts

in in alarm situations and when the controller is dead

(de-energised) Light. The contact will cut in when the controller demands light.

Electric noise

Cables for sensors, DI inputs and data communication must be kept separate from other electric cables:

- Use separate cable trays

- Keep a distance between cables of at least 10 cm

- Long cables at the DI input should be avoided

EKC 202B EKC 202C

Data communication

If data communication is used, it is important that the installation of the data communication cable is performed correctly. See separate literature No. RC8AC..

Data communication

Weight = 200 g

Supply voltage 230 V a.c. +10/-15 %. 1,5 VA, 50/60 Hz

Sensors

Pt 1000 or PTC (1000 ohm / 25°C) or NTC-M2020 (5000 ohm / 25°C)

Accuracy

Measuring range -60 to +99°C

Controller

±1 K below -35°C ±0,5 K between -35 to +25°C ±1 K above +25°C

Pt 1000 sensor

±0.3 K at 0°C ±0.005 K per grad

Display LED, 3 digits

Digital inputs

Signal from contact functions Requirements to contacts: Gold plating Cable length must be max. 15 m Use auxiliary relays when the cable is longer

Electrical connection cable

Max.1,5 mm2 multi-core cable on supply and relays. Power current terminals are mounted on the circuit board. Max. 1 mm2 on sensors - and DI inputs. Low current terminals are with plugs

Relays

(250 V a.c.)

UL *** (240 V a.c.)

DO1. Refrigeration

10 (6) A

10 A Resistive 5FLA, 30LRA

DO2. Defrost 10 (6) A

10 A Resistive 5FLA, 30LRA

DO3. Fan 6 (3) A

6 A Resistive 3FLA, 18LRA 131 VA Pilot duty

DO4. Alarm or light

4 (1) A Min. 100 mA**

4 A Resistive 131 VA Pilot duty

Environments

0 to +55°C, During operations

-40 to +70°C, During transport

20 - 80% Rh, not condensed

No shock inuence / vibrations

Density

IP 65 from front.

Buttons and packing are imbedded in the front. Escapement reserve for the clock

4 hours

Approvals

EU Low Voltage Directive and EMC demands re CE-

marking complied with

LVD tested acc. EN 60730-1 and EN 60730-2-9, A1, A2

EMC tested acc. EN50082-1 and EN 60730-2-9, A2

* DO1 and DO2 are 16 A relays. DO3 and DO4 are 8 A relays. Max. load must be keept. ** Gold plating ensures make function with small contact loads *** UL-approval based on 30000 couplings

Data

FC-SPMC

Danfoss can accept no responsibility for possible errors in catalogues, 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 without subsequential changes being necessary in specications already agreed. All trademarks in this material are property of the respecitve companies. Danfoss and Danfoss logotype are trademarks of Danfoss A/S. All rights reserved.

Ordering

Type Function Code no.

EKC 202A Refrigeration controller 084B8521

EKC 202B Refrigeration controller with fan function 084B8522

EKC 202C Refrigeration controller for electric defrost 084B8523

EKA 178A

Data communication module MOD-bus

084B8564

EKA 179A

Data communication module RS 485 - LON

084B8565

EKA 181A

Battery and buzzer module that will protect the clock in case of lengthy power failure

084B8566

EKA 181C

Battery module that will protect the clock in case of lengthy power failure

084B8577

EKA 182A Copy key EKC - EKC 084B8567

Temperature sensors: please refer to lit.no. RK0YG

Danfoss EKC 202 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual