Danfoss AK-CC 550A Instructions
Refrigeration and Air Conditioning Controller
Identification
The AK-CC 550A controller is identified by part number 084B8030.
Dimensions
The controller has the following approximate dimensions: Width: 180 mm, Height: 109 mm, Depth: 61.5 mm.
Principle
Diagrams illustrate the basic electrical principle, including connections for sensors like the "Isolar Sensor" (S2).
Information about AKV
The unit operates on 230V a.c. The coil voltage is 230 V a.c.
Additional Information
Further details are available in the English manual. Product code: RS8FS... Visit www.danfoss.com.
General Setup and Application
The controller is supplied with factory settings for application 1. It can be adjusted for other configurations as needed.
Connections Overview
The document details various input and output (DO1-DO6) and digital input (DI1-DI3) terminals, along with analog inputs (AI1-AI6) for different applications (1-10).
Digital Inputs (DI1, DI2)
DI1 and DI2 are digital input signals. Their function is active when the input is short-circuited or open, as defined by parameters 002 and 037 respectively.
Pressure Transmitter AKS 32R
Connect to terminals 30, 31, and 32. The signal can be received by up to 10 controllers, provided there is no significant pressure drop between evaporators.
Sensors (S2, S3, S4, S5, S6)
- S2, S6: Pt 1000 ohmic sensor.
- S3, S4, S5: Pt 1000 ohmic or PTC 1000 sensors. S3/S4 are for air temperature (before/after evaporator), S5 is for defrost temperature.
- S6/S5B/S3B can also be used for product or air sensors, depending on configuration.
External Displays and Communication
- EKA Display: For external reading and operation, connect EKA 163B or EKA 164B displays.
- RS485 (Terminals 51, 52, 53): For data communication with modules like LON RS485, DANBUSS, or MODBUS. Terminal 51 is for shield, 52 for A (+), and 53 for B (-). Requires version 6.20+ for LON RS485/AKA 245 gateway.
- RJ45: For data communication via a TCP/IP module.
- MODBUS (Terminals 56, 57, 58): For data communication. Terminal 56 for shield, 57 for A (+), and 58 for B (-).
Power Supply
The controller operates on 230 V a.c., 50/60 Hz.
Output Functions (DO1-DO6)
- DO1: Controls AKV or AKVA expansion valve (230V a.c. coil).
- DO2: Alarm output. Activated when terminals 7 and 8 are connected (alarm situation/no power) or terminals 7 and 9 are connected (heating/night curtain raised/suction line open).
- DO3: Controls Refrigeration, Resistance, Heating Function, or Defrost 2 when terminals 10 and 11 are active.
- DO4: Controls Defrost when terminals 12 and 14 are connected, or Hot Gas/Drain Valve when terminals 13 and 14 are connected (normal) or 12 and 14 (hot gas valve open).
- DO5: Controls the Fan when terminals 15 and 16 are connected.
- DO6: Controls Light (terminals 17 and 18) or Resistance/Compressor 2 (terminals 17 and 19).
Digital Input DI3
DI3 is a digital input signal requiring 0/230 V C.A. Its function is defined by parameter 084.
Data Communication Requirements
Proper installation of MODBUS and RS485 communication cables is crucial. Refer to separate documentation (RC8AC).
Electrical Noise Considerations
Keep cables for sensors, DI inputs, and data communication separate from other electrical cables. Use separate cable supports and maintain a distance of at least 10 cm. Avoid long cables for DI inputs.
Installation Considerations
Danfoss products incorporate protective measures, but incorrect installation can lead to malfunctions. Electronic controls do not replace good engineering practices. Danfoss is not liable for damages resulting from installation defects. Installers must verify installations and equip necessary safety devices. Special attention is required for signals when the compressor is stopped and for liquid tanks before compressors.
Coordinated Defrost
Coordinated defrost can be achieved via cable connections or data communication. Configuration for coordinating defrost occurs at the system gateway/manager. Refrigeration resumes when all controllers have signaled for defrost.
Operation
Display
The display shows values with three digits and can be configured for °C or °F.
Front Panel LEDs
LEDs indicate Refrig. (❄️), Defrost (❄️), and Fan operation (?). Blinking LEDs indicate an alarm. Alarm codes can be viewed by pressing the upper button.
Buttons
Use the upper and lower buttons to increase or decrease values. Access the menu by pressing the upper button for a few seconds. Navigate parameter codes and adjust values using the intermediate buttons. Save changes by pressing the intermediate button again.
Menu Navigation Example
- Press upper button until r01 is displayed.
- Use upper/lower buttons to find the desired parameter.
- Press intermediate button to view the parameter value.
- Use upper/lower buttons to select a new value.
- Press intermediate button again to confirm.
Alarm Handling
A brief press of the upper button allows viewing alarm codes or confirming alarms. Scroll through multiple alarm codes using upper/lower buttons.
Setting Temperature
- Press intermediate button until the temperature value is shown.
- Use upper/lower buttons to select the new value.
- Press intermediate button again to complete the setting.
Reading Defrost Sensor Temperature
A brief press of the lower button displays the defrost sensor temperature (or product sensor if selected in 092).
Manual Defrost Start/Stop
Press and hold the lower button for four seconds to start or stop defrost (not applicable for application 6).
Getting Started Quickly
- Open parameter r12 and stop regulation (default is 0 for new units).
- Select electrical connections based on diagrams on pages 2 and 3.
- Open parameter 061 and set the electrical connection number.
- Select a predefined configuration from the table.
- Open parameter 062 and set the number for the desired preset configuration.
- Select refrigerant using parameter 030.
- Open parameter r12 and start regulation.
- Review factory settings; adjust parameters as needed.
- For network setup, adjust address in 003.
- Send address to the system unit (e.g., MODBUS scanning function).
Menu Search (Parameter Overview)
The following table lists key parameters, their functions, and typical settings. Refer to the full manual for detailed application-specific configurations.
| Parameter | Function | Typical Range / Default |
|---|---|---|
| r01 | Thermostat Differential | 0.1 K - 20 K (Default: 2 K) |
| r02 | Max. Temp. Setting Limit | -49°C - 50°C (Default: 50°C) |
| r03 | Min. Temp. Setting Limit | -50°C - 49°C (Default: -50°C) |
| r05 | Temperature Unit (°C/°F) | 0/°C (Default) or 1/F |
| r12 | Service Mode: Stop/Start Regulation | -1, 0, 1 (Default: 0) |
| r15 | Thermostat Sensor Weighting (S4% / S3%) | 0% - 100% (Default: 100%) |
| d01 | Defrost Method | 0=Off, 1=Electric, 2=Hot Gas (Default: Electric) |
| d03 | Defrost Interval | 0 hours - 48 hours (Default: 8 hours) |
| d04 | Max. Defrost Duration | 0 min. - 360 min. (Default: 45 min.) |
| c01 | Compressor Min. ON Time | 0 min. - 30 min. (Default: 0 min.) |
| c02 | Compressor Min. OFF Time | 0 min. - 30 min. (Default: 0 min.) |
| 002 | DI1 Function | Various digital input functions (Default: 21) |
| 003 | Network Address | 0 - 240 (Default: 0) |
| 030 | Refrigerant Type Selection | Various codes (e.g., 1=R12, 23=R410A, 41=R449A) |
| 037 | DI2 Function | Various digital input functions |
| 061 | Access Code 2 (Partial Access) | Sets access level for certain menus. |
| 062 | Predefined Configuration Selection | Selects factory preset configurations. |
| 084 | DI3 Function | High voltage input function definition. |
Error Messages and Status Codes
When an error occurs, front panel LEDs flash, and the alarm relay activates. Pressing the upper button displays the alarm code. Alarms are categorized as 'A' (delayed) or 'E' (immediate).
Common Error Codes (A-Type)
- A1: High temperature alarm
- A2: Low temperature alarm
- A4: Door alarm
- A10: Injection problem (control issue)
- A11: No refrigerant selected
- A13: S6 high temperature alarm
- A14: S6 low temperature alarm
- A15: DI1 alarm
- A16: DI2 alarm
- AA2: Refrigerant leak detection
- AA3: CO2 refrigerant leak detection
Common Error Codes (E-Type)
- E1: Controller fault
- E6: RTC (Real-Time Clock) error
- E20: Pressure transmitter (PE) error
- E24: Sensor S2 error
- E25: Sensor S3 error
- E26: Sensor S4 error
- E27: Sensor S5 error
- E28: Sensor S6 error
- E34: Sensor S3B error
- E37: Sensor S5B error
Status Codes (Viewed by pressing upper button briefly)
- S0: Normal regulation
- S1: Waiting for coordinated defrost completion
- S2: Compressor running for minimum time
- S3: Compressor stopped for minimum time
- S4: Evaporator draining / waiting for empty time
- S10: Refrigeration stopped by main switch or DI input
- S11: Refrigeration stopped by thermostat
- S14: Defrost sequence in progress
- S15: Defrost sequence, fan delay
- S16: Refrigeration interrupted due to DI input ON or regulation stopped
- S17: Door open, DI input is open
- S18: Defrost function in progress, refrigeration interrupted
- S19: Thermostat control modulation
- S20: Emergency cooling due to sensor error
- S21: Regulation problem in injection functions
- S22: Phase 2 of start-up, evaporator to be charged
- S23: Adaptive control
- S24: Phase 1 of start-up, sensor signal reliability controlled
- S25: Manual control of outputs
- S26: No refrigerant selected
- S29: Compartment cleaning
- S30: Forced cooling
- S32: Output delay during start-up
- S33: Heating function r36 active
- S45: Box shutdown
- S48: Operation with adaptive liquid control
Data Communication Configuration
Alarm relay configuration allows defining which alarm groups (e.g., temperature alarms, sensor errors, defrost alarms) trigger the relay. Group values are summed up. Destinations for alarms can be configured for system managers like AKM.
