Danfoss EKC 202D User Manual

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Controller for temperature control

- EKC 202D

Manual

2 Manual RS8EE202 © Danfoss 08-2010 EKC 202D

Introduction

Application

• The controller is used for temperature control refrigeration appliances in supermarkets.

• With many predened applications one unit will oer you several options. Flexibility has been planned both for new installations and for service in the refrigeration trade.

Principle

The controller contains a temperature control where the signal can be received from one or two temperature sensors. The thermostat sensors are either placed in the cold air ow after the evaporator, in the warm air ow just before the evaporator, or both. A setting will determine how great an inuence the two signals are to have on the control. A measurement of the defrost temperature can be obtained directly through the use of an S5 sensor or indirectly through the use of the S4 measurement. Four relays will cut the required functions in and out – the application determines which. The options are the following:

• Refrigeration (compressor or relay)

• Fan

• Defrost

• Rail heat

• Alarm

• Light

The dierent applications are described on page 6.

Advantages

• Several applications in the same unit

• The controller has integrated refrigeration-technical functions, so that it can replace a whole collection of thermostats and timers

• Buttons and seal imbedded in the front

• Easy to remount data communication

• Two temperature references

• Digital inputs for various functions

• Clock function with super cap backup

Contents

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

Operation ............................................................................................................ 3

Applications ....................................................................................................... 6

Survey of functions .......................................................................................... 7

Operation ..........................................................................................................16

Menu survey .....................................................................................................17

Override ............................................................................................................. 19

Ordering ............................................................................................................19

Connections .....................................................................................................20

Data .....................................................................................................................21

EKC 202D Manual RS8EE202 © Danfoss 08-2010 3

Operation

Sensors

Up to two thermostat sensors can be connected to the controller. The relevant application determines how.

A sensor in the air before the evaporator:

This connection is primarily used when control is based on area.

A sensor in the air after the evaporator:

This connection is primarily used when refrigeration is controlled and there is a risk of a too low temperature near the products.

A sensor before and after the evaporator:

This connection oers you the possibility of adapting the thermostat, the alarm thermostat and the display to the relevant application. The signal to the thermostat, the alarm thermostat and the display is set as a weighted value between the two temperatures, and 50% will for example give the same value from both sensors. The signal to the thermostat, the alarm thermostat and the display can be set independently of one another.

Defrost sensor The best signal concerning the evaporator’s temperature is obtained from a defrost sensor mounted directly on the evaporator. Here the signal may be used by the defrost function, so that the shortest and most energy-saving defrost can take place.

If a defrost sensor is not required, defrost can be stopped based on time, or S4 can be selected.

Change of temperature reference

In an impulse appliance, for example, used for various product groups. Here the temperature reference is changed easily with a contact signal on a digital input. The signal raises the normal thermostat value by a predened amount. At the same time the alarm limits with the same value are displaced accordingly.

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Digital inputs

There are two digital inputs both of which can be used for one of the following functions:

- Case cleaning

- Door contact function with alarm

- Starting a defrost

- Coordinated defrost

- Change-over between two temperature references

- Retransmission of a contact’s position via data communication

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 nal push restarts refrigeration The dierent situations can be monitored on the display.

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.

- + + °C

1 ÷ + Fan

2 ÷ ÷ O

3 + + °C

Door contact function

In cold rooms and frost rooms the door switch can turn the light on and o, start and stop the refrigeration and give alarm if the door has remained open for too long.

Defrost

Depending on the application you may choose between the following defrost methods: Natural: Here the fans are kept operating during the defrost Electric: The heating element is activated Brine: The valve is kept open so that the brine can ow through the evaporator

Start of defrost

A defrost can be started in dierent ways; Interval: Defrost is started at xed time intervals, e.g., 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 Schedule: Here defrost can be started at xed times during the day and night. However, max. 6 times Contact: Defrost is started with a contact signal on a digital input Network: The signal for defrost is received from a system unit via the data communication S5 temp In 1:1 systems the eciency of the evaporator can

be monitored. Icing-up will start a defrost. Manual: An extra defrost can be activated from the control ler’s lower-most button

All the mentioned methods can be used at random – if just one of them is activated a defrost will be started.

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Coordinated defrost

There are two ways in which coordinated defrost can be arranged. Either with wire connections between the controllers or via data communication.

Wire connections

One of the controllers is dened to be the controlling unit and a battery module may be tted in it so that the clock is ensured backup. When a defrost is started all the other controllers will follow suit and likewise start a defrost. After the defrost the individual controllers will move into waiting position. When all are in waiting position there will be a change-over to refrigeration. (If just one in the group demands defrost, the others will follow suit).

Defrost via data communication

All controllers are tted with a data communication module, and via the override function from a gateway the defrost can be coordinated.

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 work in 1:1 systems

Extra module

• The controller can afterwards be tted with an insertion module if the application requires it. The controller has been prepared with a plug, so the module simply has to be pushed in

- Battery 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.

- Battery and buzzer module

As above + sound buzzer

- Data communication

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

• External display

If it is necessary to indicate the temperature on the front of refrigeration appliance, a display can be mounted. The extra display will show the same information as the controller's display, but does not incorporate buttons for operation.

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Applications

Danfoss

84B2428.12

Danfoss

84B2430.13

Danfoss

84B2429.13

Here is a survey of the controller’s eld of application.

A setting will dene the relay outputs so that the controller’s interface will be targeted the chosen application.

On page 17 you can see the relevant settings for the respective wiring diagrams.

S3 and S4 are temperature sensors. The application will determine whether either one or the other or both sensors are to be used. S3 is placed in the air ow before the evaporator. S4 after the evaporator. A percentage setting will determine according to what the control is to be based. S5 is a defrost sensor and is placed on the evaporator. DI1 and DI2 are contact functions that can be used for one of the following functions: door function, alarm function, defrost start, external main switch, night operation, change of thermostat reference, appliance cleaning, forced refrigeration or coordinated defrost. See the functions in settings o02 and o37.

Refrigeration control with one compressor

The functions are adapted to small refrigeration systems which may be either refrigeration appliances or coldrooms. The three relays can control the refrigeration, the defrost and the fans, and the fourth relay can be used for either alarm function, light control or rail heat control.

• The alarm function can be linked up with a contact function from a door switch. If the door remains open longer than allowed an alarm is triggered.

• The light control can also be linked up with a contact function from a door switch. An open door will switch on the light and it will remain lit for two minutes after the door has been closed again.

• The rail heat function can be used in refrigeration or freezing appliances or on the door’s heating element for frostrooms.

The fans can be stopped during defrost and they may also follow a door switch’s open/close situation.

There are several other functions for the alarm function as well as the light control, rail heat control and fans. Please refer to the respective settings.

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Survey of functions

Function Para-

meter

Normal display

Normally the temperature value from one of the two thermostat sensors S3 or S4 or a mixture of the two measurements is displayed. In o17 the ratio is determined.

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”

Diﬀerential

When the temperaure 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.

Ref. Dif.

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.

To avoid a too low setting of the setpoint, the min. allowable reference value must be increased.

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.

Temperature unit

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

Correction of signal from S4

Compensation possibility through long sensor cable

Correction of signal from S3

Compensation possibility through long sensor cable

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 a DI input. Stopped refrigeration will give a ”Standby alarm”.

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.)

Selection of thermostat sensor

Here you dene the sensor the thermostat is to use for its control function. S3, S4, or a combination of them. With the setting 0%, only S3 is used (Sin). With 100%, only S4.

Parameter by operation via data communication

Display air (u56)

Cutout °C

r01 Dierential

r02 Max cutout °C

r03 Min cutout °C

r04 Disp. Adj. K

r05 Temp. unit

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

r09 Adjust S4

r10 Adjust S3

r12 Main Switch

1: Start 0: Stop

-1: Manual control of outputs allowed

r13 Night oset

r15 Ther. S4 %

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 DI1 or DI2 (dened in o02 or o37).

r39 Th. oset

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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

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.

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.

Time delay for door alarm

The time delay is set in minutes. The function is dened in o02 or in o37.

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.

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.

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.

Delay of a DI1 alarm

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

Delay of a DI2 alarm

A cut-out/cut-in input will result in alarm when the time delay has been passed. The function is dened in o37

Signal to the alarm thermostat

Here you have to dene the ratio between the sensors which the alarm thermostat has to use. S3, S4 or a combination of the two. With setting 0% only S3 is used. With 100% only S4 is used

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 D01

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

The LED on the controller’s front will show whether refrigeration is in progress. Comp Relay

r40 Th. oset K

Night setbck (start of night signal)

Forced cool. (start of forced cooling)

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

A03 Alarm delay

A04 DoorOpen del

A12 Pulldown del

A13 HighLim Air

A14 LowLim Air

A27 AI.Delay DI1

A28 AI.Delay DI2

A36 Alarm S4%

Reset alarm EKC error

c30 Cmp relay NC

Here you can read the status of the compressor relay, or you can forcecontrol the relay in the ”Manual control” mode

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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, gas, brine or "non". During defrost the defrost relay will be cut in. (*) ”refrigeration relay” is active during defrost)

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.

d01 Def. method

0 = non 1 = El

2 = Gas *) 3= Brine *)

d02 Def. Stop Temp

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.

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.

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.

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).

d03 Def Interval

(0=o)

d04 Max Def. time

d05 Time Stagg.

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).

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.

d07 FanStartDel

d08 FanStartTemp

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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

Defrost sensor

Here you dene the defrost sensor. 0: None, defrost is based on time 1: S5 2: S4

Pumpdown delay

Set the time where the evaporator is emptied of refrigerant prior to the defrost.

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.

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 If you wish to see the temperature at the defrost sensor, push the controller’s lower-

most button. 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

The LED on the controller’s front will indicate whether a defrost is going on. Defrost Relay

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

d09 FanDuringDef

d10 DefStopSens.

d16 Pump dwn del.

d18 MaxTherRunT

d19 CutoutS5Dif.

Defrost temp.

Def Start Here you can start a manual defrost

Here you can read the defrost relay status or you can force-control the relay in “Manual control” mode.

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

Defrost State Status on defrost 1= pump down / defrost

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.

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.

The LED on the controller’s front will indicate whether a defrost is going on. Fan Relay

F02 Fan del. CO

F04 FanStopTemp.

Here you can read the fan relay status, or force-control the relay in “Manual control” mode.

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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.

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. 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.

Digital input signal - DI1

The controller has a digital input 1 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 “A4” 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 “A4” 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) Forced refrigeration when the input is short-circuited.

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”.

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 IMPORTANT: Before you set o04, you MUST set o61. Otherwise you will be transmitting incorrect data.

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).

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.

Display step

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

t11-t16

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

o01 DelayOfOutp.

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.

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.

o04

o05 -

o06 SensorCong

Pt = 0 PTC = 1

NTC = 2

o15 Disp. Step = 0.5

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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.

Select signal for the display S4%

Here you dene the signal to be shown by the display. S3, S4, or a combination of the two. With setting 0% only S3 is used. With 100% only S4.

Digital input signal - D2

The controller has a digital input 2 which can be used for one of the following functions: O: The input is not used.

1) Status display of a contact function

3) Door alarm. When the input is open it signals that the door is open. When the time setting in “A4” is passed an alarm will be given.

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 DI2 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.

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

11) Forced refrigeration when the input is short-circuited.

12) The input is used for coordinated defrost in conjunction with other controllers of the same type

Conﬁguration of light function (relay 4 in applications 2)

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 or o37 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.

Activation of light relay

The light relay can be activated here, but only if dened in o38 with setting 2.

Rail heat during day operation

The ON period is set as a percentage of the time

Rail heat during night operation

The ON period is set as a percentage of the time

Rail heat cycle

The period of time for the aggregate ON time + OFF time is set in minutes

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 DI1 or DI2 input, the relevant status can be seen here in the menu.

Selection of application

The controller can be dened in various ways. Here you set which of the 3 applications is required. On page 6 you can see a survey of applications.

This menu can only be set when regulation is stopped, i.e. “r12” is set to 0.

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.

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 Application (o61) and 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.

o16 Max HoldTime

o17 Disp. S4%

o37 DI2 cong.

o38 Light cong

o39 Light remote

o41 Railh.ON day%

o42 Railh.ON ngt%

o43 Railh. cycle

o46 Case clean

o61 --- Appl. Mode (only output in Danfoss

only)

o64 -

o65 -

EKC 202D Manual RS8EE202 © Danfoss 08-2010 13

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 Application (o61) and 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.

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).

Service Service

Temperature measured with S5 sensor u09 S5 temp. Status on DI1 input. on/1=closed u10 DI1 status Temperature measured with S3 sensor Status on night operation (on or o) 1=closed Temperature measured with S4 sensor u16 S4 air temp Thermostat temperature u17 Ther. air Read the present regulation reference u28 Temp. ref. Status on DI2 output. on/1=closed u37 DI2 status Temperature shown on display Measured temperature for alarm thermostat u57 Alarm air * Status on relay for cooling u58 Comp1/LLSV * Status on relay for fan u59 Fan relay * Status on relay for defrost u60 Def. relay * Status on relay for railheat * Status on relay for alarm u62 Alarm relay * Status on relay for light u63 Light relay *) Not all items will be shown. Only the function belonging to the selected applica-

tion is shown.

o66 -

o67 -

- - - Night Setback 0=Day 1=Night

u12 S3 air temp u13 Night Cond.

u56 Display air

u61 Railh. relay

14 Manual RS8EE202 © Danfoss 08-2010 EKC 202D

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 is more than one, simply push the button to scroll through and view 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 DI1 input DI1 alarm

A16: Alarm. Signal from DI2 input DI2 alarm

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

A59: Case cleaning. Signal from DI1 or DI2 input Case cleaning

Max. def time

E1: Faults in the controller EKC error

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

E25: Sensor error on S3 S3 error

E26: Sensor error on S4 S4 error

E27: Sensor error on S5 S5 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)

EKC 202D Manual RS8EE202 © Danfoss 08-2010 15

Operating status (Measurement)

The controller goes through some regulating situations where it is just waiting for the next point of the regulation. To make these “why is nothing happening” situations

EKC State:

(Shown in all menu displays) visible, you can see an operating status on the display. Push briey (1s) the upper button. If there is a status code, it will be shown on the display. The individual status codes have the following meanings:

S0: Regulating 0

S1: Waiting for end of the coordinated defrost 1

S2: When the compressor is operating it must run for at least x minutes. 2

S3: When the compressor is stopped, it must remain stopped for at least x minutes. 3

S4: The evaporator drips o and waits for the time to run out 4

S10: Refrigeration stopped by main switch. Either with r12 or a DI-input 10

S11: Refrigeration stopped by thermostat 11

S14: Defrost sequence. Defrost in progress 14

S15: Defrost sequence. Fan delay — water attaches to the evaporator 15

S17: Door is open. DI input is open 17

S20: Emergency cooling *) 20

S25: Manual control of outputs 25

S29: Case cleaning 29

S30: Forced cooling 30

S32: Delay on outputs during start-up 32

Other displays:

non: The defrost temperature cannot be displayed. There is stop based on time

-d-: Defrost in progress / First cooling after defrost

PS: Password required. Set password

*) Emergency cooling will take eect when there is lack of signal from a dened S3 or S4 sensor. The regulation will continue with a registered average

cutin frequency. There are two registered values – one for day operation and one for night operation.

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)

16 Manual RS8EE202 © Danfoss 08-2010 EKC 202D

Operation

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.

Light-emitting diodes (LED) on front panel

The other LED’s on the front panel will light up when the belonging relay is activated.

= Refrigeration = Defrost = Fan running

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 knob a brief push.

Defrosting

A “-d-” is appears in the display during defrosting. This display will appear for up to 15 minutes after cooling resumes. However, the “-d-” display does not apply if:

- Temperature is reached within 15 minutes.

- Regulation is stopped via the “Main Switch”.

- A high temperature alarm is activated.

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.

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 freeze the value.

Cutout alarm relay / receipt alarm/see alarm code

• Push short 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 again to conclude the setting.

Reading the temperature at defrost sensor

• Push short the lower button

Manuel start or stop of a defrost

• Push the lower button for four seconds.

Get a good start

With the following procedure you can start regulation very quickly:

1 Open parameter r12 and stop the regulation (in a new and not

previously set unit, r12 will already be set to 0 which means stopped regulation.)

2 Select electric connection based on the drawings on page 6

3 Open parameter o61 and set the electric connection number in

4 Open parameter r12 and start the regulation

5 Go through the survey of factory settings. The values in the grey

cells are changed according to your choice of settings. Make any necessary changes in the respective parameters.

6 For network. Set the address in o03 and then transmit it to the

gateway/system unit with setting o04.

Menu survey

Parameters

Function Codes 1 2 3 Normal operation

Temperature (set point) --- -50.0°C 50.0°C 2.0°C

Thermostat

Dierential *** r01 0.0 K 20.0K 2.0 K Max. limitation of setpoint setting *** r02 -49.0°C 50°C 50.0°C Min. limitation of setpoint setting *** r03 -50.0°C 49.0°C -50.0°C Adjustment of temperature indication r04 -20.0 K 20.0 K 0.0 K Temperature unit (°C/°F) r05 °C °F °C Correction of the signal from S4 r09 -10.0 K +10.0 K 0.0 K Correction of the signal from S3 r10 -10.0 K +10.0 K 0.0 K Manual service, stop regulation, start regulation (-1, 0, 1) r12 -1 1 0 Displacement of reference during night operation r13 -10.0 K 10.0 K 0.0 K Denition and weighting, if applicable, of thermostat sensors - S4% (100%=S4, 0%=S3) Activation of reference displacement r40 r39 OFF ON OFF Value of reference displacement (activate via r39 or DI) r40 -50.0 K 50.0 K 0.0 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 -50.0°C 50.0°C 8.0°C Low alarm limit *** A14 -50.0°C 50.0°C -30.0°C Alarm delay DI1 A27 0 min 240 min 30 min Alarm delay DI2 A28 0 min 240 min 30 min Signal for alarm thermostat. S4% (100%=S4, 0%=S3) A36 0% 100% 100%

Compressor

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

Defrost

Defrost method (none/EL/GAS/BRINE) d01 no bri EL Defrost stop temperature d02 0.0°C 25.0°C 6.0°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 -15.0°C 0.0°C -5.0°C Fan cutin during defrost

EL-diagram

number (page 6)

r15 0% 100% 100%

c30 0

d09 0 2 1

Min.-value Max.-value

OFF

SW = 2.2x

Factory set-

ting

OFF

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

Defrost sensor (0=time, 1=S5, 2=S4) d10 0 2 0 Pump down delay d16 0 min 60 min 0 min 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)

Fan

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 -50.0°C 50.0°C 50.0°C

Real time clock

Six start times for defrost. Setting of hours. 0=OFF Six start times for defrost. Setting of minutes. 0=OFF 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 (activate r40). 8=alarm function when closed. 9=alarm function when open. 10=case cleaning (pulse pressure). 11=forced cooling. Network address o03 0 240 0 On/O switch (Service Pin message) IMPORTANT! o61 must be set prior to o04 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 Select signal for display view. S4% (100%=S4, 0%=S3) o17 0% 100% 100%

d19 0.0 K 20.0 k 20.0 K

t01-

t06

t11-

t16

o02 1 11 0

o04 OFF ON OFF

0 hours 23 hours 0 hours

0 min 59 min 0 min

Actual set-

ting

Input signal on DI2. Function: (0=not used. 1=status on DI2. 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 (activate r40). 8=alarm function when closed. 9=alarm function when open. 10=case cleaning (pulse pressure). 11=forced cooling.). 12=coordinated defrost) Conguration of light function (relay 4) 1=ON during day operation. 2=ON / OFF via data communication. 3=ON follows the DI-function, when DI is selected to door function or to door alarm Activation of light relay (only if o38=2) o39 OFF ON OFF Rail heat On time during day operations o41 0% 100% 100 Rail heat On time during night operations o42 0% 100% 100 Rail heat period time (On time + O time) o43 6 min 60 min 10 min Case cleaning. 0=no case cleaning. 1=Fans only. 2=All output O. *** o46 0 2 0 Selection of EL diagram. See overview page 6 * o61 1 2 3 1 3 1 Access code 2 (partly access) *** o64 0 100 0 Save the controllers present settings to the programming key. Select your own number. Load a set of settings from the programming key (previously saved via o65 function) Replace the controllers factory settings with the present settings o67 OFF On OFF

Service

Status codes S0-S33 Temperature measured with S5 sensor *** u09

Status on DI1 input. on/1=closed u10 Temperature measured with S3 sensor *** u12 Status on night operation (on or o) 1=closed *** u13 Temperature measured with S4 sensor *** u16 Thermostat temperature u17 Read the present regulation reference u28 Status on DI2 output. on/1=closed u37 Temperature shown on display u56 Measured temperature for alarm thermostat u57 Status on relay for cooling ** u58 Status on relay for fan ** u59 Status on relay for defrost ** u60 Status on relay for railheat ** u61 Status on relay for alarm ** u62 Status on relay for light ** u63

*) Can only be set when regulation is stopped (r12=0) **) Can be controlled manually, but only when r12=-1 ***) With access code 2 the access to these menus will be limited

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 both buttons depressed at the same time as you recon nect the supply voltage

o37 0 12 0

o38 1 3 1

o65 0 25 0

o66 0 25 0

Override

The controller contains a number of functions that can be used together with the override function in the master gateway / System Manager.

Function via data communication

Start of defrosting Defrost control

Coordinated defrost Defrost control - - - HoldAfterDef

Night setback Day/night control

Light control Day/night control

Functions to be used in the gateway’s override function

Time schedule

Used parameter in EKC 202D

- - - Def.start

u60 Def.relay

- - - Night setbck

o39 Light Remote

Ordering

Type Function Voltage supply Code no.

230 V a.c. 084B8536

115 V a.c. 084B8537

EKC 202D

Refrigeration controller without data communication but prepared for mounting of one module

EKA 178A

EKA 179A Data communication module

EKA 181A Battery and buzzer module that will protect the clock in case of

EKA 181C

EKA 182A Copy key EKC - EKC 084B8567

EKA 163A External display 084B8562

Data communication module MOD-bus

LON RS 485

lengthy power failure

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

084B8564

084B8565

084B8566

084B8577

Connections

(115 V a.c.)

Power supply

230 V a.c. (115 V version available)

Sensors

S3 and S4 are thermostat sensors. A setting determines whether S3 or S4 or both of them are to be used. S5 is a defrost sensor and is used if defrost has to be stopped based on temperature.

Digital On/Oﬀ signals

A cut-in input will activate a function. The possible functions are described in menus o02 and o37.

External display

Connection of display type EKA 163A.

Relays

The general uses are mentioned here. See also page 6 where the dierent applications are shown. DO1: Refrigeration. The relay will cut in when the controller demands refrigeration DO2: Defrost. The relay will cut in when defrost is in progress DO3: Fans

The relay will cut in when the fans have to operate

DO4: For either alarm, rail heat or light

Alarm: Cf. diagram. The relay is cut in during normal operation and cuts out in alarm situations and when the controller is dead (de-energised)

Rail heat: The relay cuts in when rail heat is to operate Light: The relay cuts in when the light has to be switched on

Data communication

The controller is available in several versions where data communication can be carried out with one of the following systems: MOD-bus or LON-RS485. If data communication is used, it is important that the installation of the data communication cable is performed correctly. See separate literature No. RC8AC…

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

Coordinated defrost via cable connections

Coordinated defrost via data communication

The following controllers can be connected up in this way: EKC 204A, EKC 202D

Refrigeration is resumed when all controllers have “released” the signal for defrost.

Data

Supply voltage

Sensors 3 pcs o either

Accuracy

Display LED, 3-digits

External display EKA 163A

Digital inputs

Electrical connection cable

Relays*

Environments

Density

Escapement reserve for the clock

Approvals

* 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

230 V a.c.(or 115 V version) +10/-15 %. 2.5 VA, 50/60 Hz

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

Measuring range -60 to +99°C

Controller

Pt 1000 sensor

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

Max.1.5 mm2 multi-core cable

DO1. Refrigeration

DO2. Defrost 10 (6) A

DO3. Fan 6 (3) A

DO4. Alarm, light or rail heat

0 to +55°C, During operations

-40 to +70°C, During transport

20 - 80% Rh, not condensed

No shock inuence / vibrations

IP 65 from front. Buttons and packing are imbedded in the front.

4 hours

EU Low Voltage Directive and EMC demands re CEmarking complied with LVD tested acc. EN 60730-1 og EN 60730-2-9, A1, A2 EMC tested acc. EN50082-1 og EN 60730-2-9, A2

±1 K below -35°C ±0.5 K between -35 to +25°C ±1 K above +25°C

±0.3 K at 0°C ±0.005 K per grad

(250 V a.c.)

10 (6) A

4 (1) A Min. 100 mA**

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

10 A Resistive 5FLA, 30LRA

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

4 A Resistive 131 VA Pilot duty

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.

FC-SPMC

Danfoss EKC 202D User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual