Controller for appliance control AK-CC 550 Manual
Contents Introduction........................................................................................................ 2 Operation............................................................................................................. 4 Applications......................................................................................................12 Survey of functions.........................................................................................15 Operation.........................
Applications Here is an overview of the controller’s usage options. A setting will configure input and outputs so that the controller’s operation interface is directed at the selected application. The current settings for the respective uses can be found on page 28. Application 1-8 These uses are applied to standard appliances or cold storage rooms with one valve, one evaporator and one refrigeration section. The sensors are used according to standard principles.
Operation Liquid injection Liquid injection in the evaporator is controlled by an electronic injection valve of the type AKV. The valve functions as both expansion valve and solenoid valve. The valve opens and closes using signals from the controller. The function contains an adaptive algorithm which independently adjusts the valve’s opening so that the evaporator constantly supplies optimum refrigeration.
Thermostat bands Thermostat bands can be used beneficially for appliances where different product types are stored which require different temperature conditions. It is possible to change between the two different thermostat bands via a contact signal on a digital input. Separate thermostat and alarm limits can be set for each thermostat band – also for the product sensor.
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 Hotgas: Here the solenoid valves are controlled so that the hotgas can flow through the evaporator Defrost sequence 1) Pump down 2) Defrost 3) Waiting position after defrost 4) Draining (drain delay.
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 The digital input DI2 is connected between the current controllers. When one controller starts a defrost all the other controllers will follow suit and likewise start a defrost. After the defrost the individual controllers will move into waiting position.
Control of two compressors The two compressors must be of the same size. When the controller demands refrigeration it will first cut in the compressor with the shortest operating time. After the time delay the second compressor will be cut in. When the temperature has dropped to ”the middle of the differential”, the compressor with the longest operation time will be cut out. The running compressor will continue until the temperature has reached the cutout value. Then it will cut out.
Fan Pulse control To obtain energy savings it is possible to pulse control the power supply to the fans at the evaporators. Pulse control can be accomplished in one of the following ways: - during the thermostat’s cutout period (cold room) - during night operation and during the thermostat’s cutout period (appliance with night lid) A period of time is set as well as the percentage of this period of time where the fans have to be operating.
Digital inputs There are two digital inputs DI1 and DI2 with contact function and one digital input DI3 with high voltage signal.
Data communication The controller has fixed built-in MODBUS data communication. If there is a requirement for a different form of data communication, a Lon RS 485 module can be inserted in the controller. The connection must then be to terminal RS 485. (To use a Lon RS 485 module and gateway type AKA 245 the module must be Version 6.20 or higher.) Display The controller has one plug for a display. Here display type EKA 163B or EKA 164B (max. length 15m) can be connected. EKA 163B is a display for readings.
Applications 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 flow before the evaporator. S4 after the evaporator. A percentage setting will determine how the control is to be based. S5 is a defrost sensor and is placed on/in the fins of the evaporator. S6 is a product sensor, but in application 9 and 10 it has a different use.
5 The following uses have some special functions which in brief are: Application 5 ”Two-compressor” operation. The two compressors must be of the same size. On start-up (after defrosting, operational stop, etc.) both compressors are started with a set time shift. One compressor starts at half the differential so that an optimum adaptation of compressor capacity takes place for the current load in the appliance/room. There is automatic runtime equalisation between the compressors.
Connection signs The controller is provided with signs from the factory indicating application 1. If you employ another use, signs are provided so that you can mount the relevant one. It is only the lower sign that needs to be mounted. The number is indicated on the left-hand side of the signs. Use the sign with the current application number. One of the signs applies to both applications 4 and 10.
Survey of functions Function Para- Parameter by operation via data meter communication 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 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.
Set point 2 The thermostat’s cutout value when the thermostat band 2 is activated via a digital input. Correction of signal from S6 Compensation possibility due to long sensor cable Selection of thermostat sensor S4% during night operation with night blinds Here you define 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.
Compressor Compressor control The compressor relay works in conjunction with the thermostat. When the thermostat calls for refrigeration 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) Min.
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 off the evaporator). d06 DripOff 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).
AKV valve’s time period in seconds Should only be set to a lower value if it is a decentralised plant and the suction pressure fluctuates a lot and in line with the opening of the AKV valve. Startup time for signal reliability If the controller does not obtain a reliable S1 signal within this period of time it will in other ways try to create a stable signal. (A too high value may result in a flooded evaporator). The value should only be changed by specially trained staff.
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 Digital input signal - DI1 The controller has a digital input 1 which can be used for one of the following functions: Off: 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.
Digital input signal - D2 The controller has a digital input 2 which can be used for one of the following functions: Off: 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 resumed. (o89). 3) Door alarm. When the input is open it signals that the door is open.
Digital input signal - DI3 (high voltage input) The controller has a digital input 3 which can be used for one of the following functions: Off: The input is not used. 1) Status display of 230 V signal 2) Door function. When the input is 0 V 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 resumed. (o89) 3) Door alarm. When the input is 0 V it signals that the door is open.
Service Temperature measured with S5 sensor Status on DI1 input. on/1=closed Read the duration of the ongoing defrost or the duration of the last completed defrost.
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 visible, you can see an operating status on the display. Push briefly (1s) the upper button. If there is a status code, it will be shown on the display.
Fault message In an error situation the LED’s on the front will flash 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. 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.
Operation Display The values will be shown with three digits, and with a setting you can determine whether the temperature is to be shown in °C or in °F. 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.) Light-emitting diodes (LED) on front panel The LED’s on the front panel will light up when the relevant relay is activated.
Auxiliary schedule for settings (quick-setup) Case Defrost stop on time Preset settings (o62) Room Defrost stop on S5 Defrost stop on time Defrost stop on S5 1 2 3 4 5 6 Temperature (SP) 2°C -2°C -28°C 4°C 0°C -22°C Max. temp. setting (r02) 6°C 4°C -22°C 8°C 5°C -20°C Min. temp. setting (r03) 0°C -4°C -30°C 0°C -2°C -24°C Sensor signal for thermostat.
Menu survey SW = 1.5x Parameter Code 1 EL-diagram page 12 or 13 2 3 4 5 6 7 8 9 --- 1 1 1 1 1 1 1 1 1 1 -50°C 50°C 2 r01 r02 r03 r04 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0.
Continued Code 1 2 3 4 5 6 7 8 9 10 d16 d17 d18 d20 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 d21 1 1 1 1 1 1 1 1 1 d22 1 1 1 1 1 1 1 1 Injection algorithm Only for trained personnel n05 1 1 1 1 1 1 1 Max.
Continued Code 1 2 3 4 5 6 7 8 9 10 o30 1 1 1 1 1 1 1 1 1 1 0 31 0 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-signal). 5=ext. main switch 6=night operation 7=thermostat band changeover (activate r21). 8=alarm function when closed. 9=alarm function when open. 10=case cleaning (pulse signal). 11=forced cooling at hot gas defrost.).
Continued Code 1 2 3 4 5 6 7 8 9 10 u09 u10 u11 u12 u13 u16 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 u17 u18 u19 u20 u21 u22 u23 u25 u26 u36 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 u37 u56 u57 u58 u59 u60 u61 u62 u63 u64 u67 1 1 1 1 1 1 1
Connections Version where sensor connections have plug connections. Application Overview of outputs and applications. DO1 DO2 DO3 DO4 DO5 1 2 See also electrical diagrams earlier in the manual 3 4 5 6 suction 7 hotgas Blinds 8 heat 9 2 1 10 DI1 Digital input signal. The defined function is active when the input is short-circuited/ opened. The function is defined in o02. DI2 Digital input signal. The defined function is active when the input is short-circuited/ opened.
DO1 Connection of expansion valve type AKV or AKVA. The coil must be a 230 V a.c. coil. DO2 Alarm There is a connection between terminal 7 and 8 in alarm situations and when the controller is without power. Rail heat and heating element in drip tray There is connection between terminal 7 and 9 when heating takes place. Night blind There is connection between terminal 7 and 9 when the night blind is up. Suction line valve There is connection between terminal 7 and 9 when the suction line must be open.
Data Supply voltage 230 V a.c. +10/-15 %. 5 VA, 50/60 Hz Sensor S2, (S1) Pt 1000 Sensor S3, S4, S5, S6 Accuracy Measuring of Pe Display Pt 1000 or PTC 1000 ohm / 25°C (All 4 must be of the same type) Measuring range -60 to +120°C ±1 K below -35°C Controller ±0.5 K between -35 to +25°C ±1 K above +25°C ±0.3 K at 0°C Pt 1000 sensor ±0.005 K per grad Pressure AKS 32R transmitter LED, 3-digits External display EKA 163B or 164B.
Ordering Type Function AK-CC 550 Case controller with MODBUS data communication Sensor connections are with screw terminals Case controller with MODBUS data communication Sensor connections are with plug connections Code no.
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