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Summary of Contents for Danfoss AK-PC 651
- Page 1 User Guide Capacity controller AK-PC 651 ADAP-KOOL® Refrigeration Control System...
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Page 2: Operation
User Guide | Capacity Controller, AK-PC 651 Introduction Application The controller is used for capacity regulation of compressors and condensers in small refrigeration applications. A maximum of 10 compressors and one condenser can be regulated. For exam- ple: • One suction group + one condenser group (max. 15 steps) •... -
Page 3: Suction Group
User Guide | Capacity Controller, AK-PC 651 Suction Group Compressor types The following types of compressor combinations can be used for regulation: • Several single-step compressors • One speed controlled compressor + single-step compressors or multi -step compressors • One Digital scroll compressor + single-step compressors or multi -step compressors •... - Page 4 User Guide | Capacity Controller, AK-PC 651 Condenser Fan control The fans can be controlled incrementally using the controller’s relays, or they can be speed-controlled via the controller’s analogue output. Speed control can be via a frequency VLT-type converter. If the fans have EC motors, the 0-10 V signal can be used directly.
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Page 5: Safety Functions
User Guide | Capacity Controller, AK-PC 651 Safety functions Min./max. suction pressure Po Sensor failure The suction pressure is recorded continuously. If lack of signal from one of the connected temperature sensors or If the measured value falls below the set minimum limit, the pressure transmitters is registered an alarm will be given. -
Page 6: Display Overview
User Guide | Capacity Controller, AK-PC 651 Display overview End-user overview The images in this daily user interface will depend on how the set-up is made. They will illustrate what is regulated. For example: One or two suction groups, one condenser group, or a combination. See examples below:... -
Page 7: Setup Overview
User Guide | Capacity Controller, AK-PC 651 Set-up overview There are three ways in which the controller can be set up. Select the one that is easiest for you: either “Wizard”, “Quick settings” or a review of “all parameters”. Start screen upon delivery Operating principles 1. - Page 8 User Guide | Capacity Controller, AK-PC 651 Menu SW: 1.3x Start/stop Main switch Main switch On / Off Start and stop regulating here. The configuration settings will require that regulating is stopped. If you try to enter a configuration setting when regulating has started, the controller will ask if regulating should be stopped.
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Page 9: Control Settings
User Guide | Capacity Controller, AK-PC 651 Control status Read the status of the control circuit here e.g.: • No comp. - No compressor capacity available • Normal ctrl - Normal control • Alarm Comp. - Cannot start compressor due to alarm condition •... - Page 10 User Guide | Capacity Controller, AK-PC 651 First step runtime At start-up, the cooling system must have time to cool down before PI regulation takes over Min: 0 s Max: 300 s the regulation role and can cut in the next compressor.
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Page 11: Compressor Timers
User Guide | Capacity Controller, AK-PC 651 VSD Max speed ***: For speed Min: 40 Hz Max: 120 Hz Highest permitted speed for compressor Fac: 60 Hz PWM period time *, **: For “Scroll” and “Stream” Min: 10 s Max: 20 s... - Page 12 User Guide | Capacity Controller, AK-PC 651 Comp. Min OFF Min. Off-time for remaining compressors Min: 0 min. Max: 30 min Set the forced Off-time during which the compressor must be off before it can be switched Fac: 0 min on again.
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Page 13: Fan Configuration
User Guide | Capacity Controller, AK-PC 651 Sc3 offset Temperature offset for regulation with fluid reference. Min: 0 K Max: 20 K Regulation reference = Sc3 measurement + Sc3 offset Fac: 6 K Min. reference Set the lowest permissible regulation reference here Min: -25°C (-1.0 bar) - Page 14 User Guide | Capacity Controller, AK-PC 651 Fan status Fan status Fan speed Here a reading of the desired condenser fan capacity is provided in % VSD start/stop Fan operation (frequency converter) status can be read here Fan 1 The status of relay 1 (step 1 or relay for frequency converter) is indicated here Fan 2..
- Page 15 User Guide | Capacity Controller, AK-PC 651 General functions Digital input alarms General on/off alarm Here you can define up to 3 alarms that are not related to the regulation function. When a signal is received on the input, the controller will generate an alarm, but only after the related delay time has elapsed.
- Page 16 User Guide | Capacity Controller, AK-PC 651 Password Access code The settings in the controller can be protected with three levels of access codes. Password level 1 Fac: 100 Level 1: End user settings, such as changing the weekly plan...
- Page 17 User Guide | Capacity Controller, AK-PC 651 Analog outputs 0-10 V outputs 0-10 V 0-5 V When a function has been defined that needs to use a variable voltage outlet, it will be pos- sible to select this function on one of the available AO outputs.
- Page 18 User Guide | Capacity Controller, AK-PC 651 Alarm priorities General Alarm priorities Critical Servere Standby mode: The controller will issue an alarm notification if a specific incident occurs. Normal Sensor error: Each incident is set to indicate the importance of each alarm, but it is possible to modify the...
- Page 19 User Guide | Capacity Controller, AK-PC 651 Connections used in “Quick configurations” © Danfoss | ADAP-KOOL® | 2015.10 RS8HA102 | 19...
- Page 20 User Guide | Capacity Controller, AK-PC 651 Connections when using Setup Wizard If you have used the Setup Wizard for the configuration, the controller will automatically assign the selected functions to inputs and outputs in accordance with the following prioritised order:...
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Page 21: Alarm List
User Guide | Capacity Controller, AK-PC 651 Alarm list Alarm text Reason Priority Default setting value General alarms Standby mode (Main sw. OFF) Alarm when control is stopped by internal or external Main Switch (DI input "Main Switch") Standby mode... - Page 22 User Guide | Capacity Controller, AK-PC 651 Connections Connection, lower level Warning The supply voltage of AI may not share the signal with other controllers. DO10 DO11 DO12 DO13 DO14 DO15 Σ 1-15 I Max. 0.5 A 0.5 A 92 A min.
- Page 23 User Guide | Capacity Controller, AK-PC 651 Connection, upper level DI - High or low voltage Digital switch inputs, 4 pcs. DI1 - DI4 Terminal = DI1H, DI1, DI common ... 230 V signal: Connect to DI_H 24 V signal: Connect to DI_ The connection may be a shut-down or interruption function.
- Page 24 User Guide | Capacity Controller, AK-PC 651 Copeland Stream compressor The PWM signal can also be used to control one stream compressor with one unloader valve (Stream 4) or one with two unloaders (Stream 6). Stream 4: The compressor capacity is distributed by up to 50% for one relay and the remaining 50-100% for the unloader. The unloader is connected to DO5 or DO6.
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Page 25: External Display
User Guide | Capacity Controller, AK-PC 651 Data External display Supply voltage 230 a.c. (85-265 V) 50/60 Hz, 26 VA An external display is only for front assembly (IP 20) Pressure meauring: Connection only via cable with plug. See ordering. -
Page 26: Mounting Dimensions
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 specifications already agreed.
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