Danfoss AK-CH 650 User Manual
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Danfoss AK-CH 650 User Manual

Capacity controller for water chillers
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User Guide
Capacity controller for
water chillers
AK-CH 650
SW 2.0
ADAP-KOOL® Refrigeration control systems

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Summary of Contents for Danfoss AK-CH 650

  • Page 1 User Guide Capacity controller for water chillers AK-CH 650 SW 2.0 ADAP-KOOL® Refrigeration control systems...

  • Page 2: Table Of Contents

    Safety functions for condenser ..........96 General monitoring functions ............97 Miscellaneous ..................98 Appendix A – Compressor combinations and coupling pat- terns ......................101 Appendix B - Alarm texts ..............108 Appendix C - ..................110 Recommended connection ..............110 Capacity controller RS8ER302 © Danfoss 2016-02 AK-CH 650...

  • Page 3: Introduction

    Example If the condenser end needs full control of a dry refrigeration The controller uses the following signals for control/monitoring: circuit, AK-CH 650 can be combined with a type AK-PC 420 dry Charge temperature (control signal) refrigeration control. Return temperature...

  • Page 4: Principles

    A regulation with few connections can If there are many connections one or more Examples be performed with the controller module extension modules have to be mounted alone Capacity controller RS8ER302 © Danfoss 2016-02 AK-CH 650...
  • Page 5 A total of 4 displays can be fitted and with one setting it is pos- sible to choose between the following readings: suction pressure, suction pressure in temperature, S3, S4, Ss, Sd, condenser pres- sure, condenser pressure in temperature and S7. AK-CH 650 Capacity controller RS8ER302 © Danfoss 2016-02...
  • Page 6 One example may be slow clogging-up of a condenser. When the alarm comes the capacity has been reduced, but the situation is Error not serious. There will be time to plan a service call. Capacity controller RS8ER302 © Danfoss 2016-02 AK-CH 650...

  • Page 7: Design Of A Controller

    If it is an application with many connections it will be necessary to use the controller module plus one or more extension modules. This section will give you a survey of possible connections plus assistance in selecting the modules required by your actual application. AK-CH 650 Capacity controller RS8ER302 © Danfoss 2016-02...

  • Page 8: Module Survey

    The module with additional relay outputs is also available in a version where the top part is provided with change-over switches so that the relays can be overridden. Extension module with 2x analog output signals Capacity controller RS8ER302 © Danfoss 2016-02 AK-CH 650...
  • Page 9 Real time clock for use in controllers that require a clock function, but are not wired with data communication. AK-OB 101A Real time clock with battery backup. To be mounted in an AK controller On the following pages there is data specific to each module. AK-CH 650 Capacity controller RS8ER302 © Danfoss 2016-02...

  • Page 10: Common Data For Modules

    The relays cannot be used for the direct connection of capacitive loads such as LEDs and on/off control of EC motors. All loads with a switch mode power supply must be connected with a suitable con- tactor or similar. Capacity controller RS8ER302 © Danfoss 2016-02 AK-CH 650...
  • Page 11 Modules in the 100-series consist of one module Modules in the 200-series consist of two modules Controllers consist of three modules The length of an aggregate unit = n x 72 + 8 AK-CH 650 Capacity controller RS8ER302 © Danfoss 2016-02...

  • Page 12: Controller

    - 3 LED’s that are not used • “Service Pin” switch has been activated A small module (option board) can be placed on the bottom part of the controller. The module is described later in the document. Capacity controller RS8ER302 © Danfoss 2016-02 AK-CH 650...
  • Page 13 Rail heat 17 (DO6) 42 -43 - 44 Defrost 18 (DO7) 45 - 46- 47 19 (DO8) 48 - 49 -50 Option Board Please see the signal on the page with the module. AK-CH 650 Capacity controller RS8ER302 © Danfoss 2016-02...

  • Page 14: Extension Module Ak-Xm 101A

    5 V output or the 12 V output depending on transmitter type. Light-emitting diodes Only the two top LED’s are used. They indicate the following: • Voltage supply to the module • Communication with the controller is active (red = error) Capacity controller RS8ER302 © Danfoss 2016-02 AK-CH 650...
  • Page 15 Active at: Main switch 5 (AI 5) 17 - 18 Closed 6 (AI 6) 19 - 20 Day/ Open Night 7 (AI 7) 21 - 22 Door 8 (AI 8) 23 - 24 AK-CH 650 Capacity controller RS8ER302 © Danfoss 2016-02...

  • Page 16: Extension Module Ak-Xm 102A / Ak-Xm 102B

    • Communication with the controller is active (red = error) Off: DI < 2 V a.c. Off: DI < 24 V a.c. • Status of the individual inputs 1 to 8 (when lit = voltage) Capacity controller RS8ER302 © Danfoss 2016-02 AK-CH 650...
  • Page 17 5 - 6 4 (DI 4) 7 - 8 5 (DI 5) 9 - 10 6 (DI 6) 11 - 12 7 (DI 7) 13 - 14 8 (DI 8) 15 - 16 AK-CH 650 Capacity controller RS8ER302 © Danfoss 2016-02...

  • Page 18: Extension Module Ak-Xm 103A

    Only the two top LED’s are used. They indicate the following: • Voltage supply to the module • Communication with the controller is active (red = error) Max. load I < 2.5 mA R > 4 kΩ Capacity controller RS8ER302 © Danfoss 2016-02 AK-CH 650...
  • Page 19 17 - 18 Main switch Closed 6 (AO 2) 19 - 20 Day/ Night Open 7 (AO 3) 21 - 22 Door 8 (AO 4) 23 - 24 Level switch 0-10 V AK-CH 650 Capacity controller RS8ER302 © Danfoss 2016-02...

  • Page 20: Extension Module Ak-Xm 204A / Ak-Xm 204B

    Keep the safety distance! Max. 230 V Low and high voltage AC-1: max. 4 A (ohmic) must not be connected to AC-15: max. 3 A (Inductive) the same output group AK-XM 204B Override of relay Capacity controller RS8ER302 © Danfoss 2016-02 AK-CH 650...
  • Page 21 5 (DO 5) 37 - 38 - 39 6 (DO 6) 40 - 41 - 42 7 (DO 7) 43 - 44 - 45 8 (DO 8) 46 - 47 - 48 AK-CH 650 Capacity controller RS8ER302 © Danfoss 2016-02...

  • Page 22: Extension Module Ak-Xm 205A / Ak-Xm 205B

    AC-1: max. 4 A (ohmic) Behind the upper part there is a fuse for each output. must not be connected to AC-15: max. 3 A (Inductive) the same output group AK-XM 205B Override of relay Capacity controller RS8ER302 © Danfoss 2016-02 AK-CH 650...
  • Page 23 13 (DO 5) 37 - 38 - 39 Light Rail 14 (DO6) 40 - 41 - 42 heat Defrost 15 (DO7) 43 - 44 - 45 16 (DO8) 46 - 47 - 48 AK-CH 650 Capacity controller RS8ER302 © Danfoss 2016-02...

  • Page 24: Extension Module Ak-Ob 110

    The two outputs have points 24 and 25. They are shown on the earlier page where the controller is also mentioned. Max. load I < 2,5 mA R > 4 kohm Module Point 0 - 10 V Type Capacity controller RS8ER302 © Danfoss 2016-02 AK-CH 650...

  • Page 25: Extension Module Ak-Ob 101A

    The working life of the battery is several years – even if there are frequent power failures. An alarm is generated when the battery has to be replaced. After the alarm there are still several months of operating hours left in the battery. AK-CH 650 Capacity controller RS8ER302 © Danfoss 2016-02...

  • Page 26: Extension Module Eka 163B / Eka 164B

    The extension module can be placed at a distance of up to 15 m from the controller module. Module Point Point Type No point has to be defined for a display module – you simply con- nect it. Capacity controller RS8ER302 © Danfoss 2016-02 AK-CH 650...

  • Page 27: Power Supply Module Ak-Ps 075 / 150

    24 V d.c. 1.5 A 36 VA (adjustable) Connections Dimension Type High Width AK-PS 075 90 mm 36 mm AK-PS 150 90 mm 54 mm Supply to a controller AK-PS 075 AK-PS 150 AK-CH 650 Capacity controller RS8ER302 © Danfoss 2016-02...

  • Page 28: Preface To Design

    Alarm function The requirements to the installation are described in a separate If the alarm is to be sent to a signal transmitter, a relay output will document. have to be used. Capacity controller RS8ER302 © Danfoss 2016-02 AK-CH 650...

  • Page 29: Connections

    (If one controller is switched off, the sig- nal will be pulled down, and all the other controllers will receive a signal which is too low) AK-CH 650 Capacity controller RS8ER302 © Danfoss 2016-02...

  • Page 30: Design Of A Compressor And Condenser Control

    Relay output, which is activated by a request for extra cooling 0-10 V signal, which shows cutin compressor capacity Brine temperature reference Override via P0 optimisation Override via “night setback” Override via "0 -10 V signal" Regulation of condenser capacity Step regulation Capacity controller RS8ER302 © Danfoss 2016-02 AK-CH 650...

  • Page 31: Connections

    To be used when monitoring function FDD is used. • Shrec (heat recovery thermostat) To be used when regulation is performed with floating Must be used when heat recovery is controlled via a thermostat condenser reference. function. AK-CH 650 Capacity controller RS8ER302 © Danfoss 2016-02...
  • Page 32 Data from this example is used on the next page. The result is that the following modules should be used: • Monitoring of P0, Pc, Sd and superheat in suction line • AK-CH 650 basic module • P0 min. = -10°C • AK-XM 102A digital input module •...

  • Page 33: Planning Table

    ___ pcs. á 5 VA = __ AK_OB 110 (2 analog outputs) ___ pcs. á 0 VA = 0 1 pcs. á 8 VA = 8 Sum = Sum = max. 32 VA AK-CH 650 Capacity controller RS8ER302 © Danfoss 2016-02...

  • Page 34: Length

    DIN rail – no matter where in the row the module is found. Removal is likewise carried out with the two catches in the open position. Capacity controller RS8ER302 © Danfoss 2016-02 AK-CH 650...

  • Page 35: Determine The Connection Points

    Frost protection 6 (DI 6) 11 - 12 Open Speed control of compressor 0-10 V DI alarm, Receiver level 7 (DI 7) 13 - 14 Open 8 (DI 8) 15 - 16 AK-CH 650 Capacity controller RS8ER302 © Danfoss 2016-02...

  • Page 36: Connection Diagram

    Drawings of the individual modules may be ordered from Danfoss. Format = dwg and dxf. You may then yourself write the module number in the circle and draw the individual connections. Example continued: Capacity controller RS8ER302 © Danfoss 2016-02 AK-CH 650...

  • Page 37: Supply Voltage

    (If one controller is switched off, the sig- ------ nal will be pulled down, and all the other controllers will receive a Transformer size (least) 15 VA signal which is too low) AK-CH 650 Capacity controller RS8ER302 © Danfoss 2016-02...

  • Page 38: Ordering

    Real time clock for use in controllers that require a clock function, but are not wired with data communication. 080Z0252 AK-OB 101A Real time clock with battery backup. To be mounted in an AK controller Capacity controller RS8ER302 © Danfoss 2016-02 AK-CH 650...

  • Page 39: Mounting And Wiring

    • Is connected We have decided to work on the basis of the example we went through previously, i.e. the following modules: • AK-CH 650 controller module • AK-XM 204B relay module • AK-XM 102B digital input module • AK-OB 110 analog output module AK-CH 650 Capacity controller RS8ER302 ©...

  • Page 40: Mounting

    2. Mount the extension module in the basic module There are two out- puts, but we only use one in the example. 3. Put the top part back on the basic module Capacity controller RS8ER302 © Danfoss 2016-02 AK-CH 650...

  • Page 41: Mounting Of Extension Module On The Basic Module

    DIN rail – regard- less of where the module is on the row. Disassembly is thus done with the two snap catches in the open posi- tion. AK-CH 650 Capacity controller RS8ER302 © Danfoss 2016-02...

  • Page 42: Wiring

    5 (DI 5) 9 - 10 Open 6 (DI 6) 11 - 12 Frost protection Open 7 (DI 7) 13 - 14 DI alarm, Receiver level Open 8 (DI 8) 15 - 16 Capacity controller RS8ER302 © Danfoss 2016-02 AK-CH 650...
  • Page 43 ■ Service Pin Network installation 5. When there is a network Set the address and activate the Service Pin. Status on output 1-8 6. The controller is now ready to be configured. AK-CH 650 Capacity controller RS8ER302 © Danfoss 2016-02...
  • Page 44 Capacity controller RS8ER302 © Danfoss 2016-02 AK-CH 650...

  • Page 45: Configuration And Operation

    We have decided to work on the basis of the example we went through previously, i.e. compressor control with 4 compressors and condenser control with 4 fans. The example is shown overleaf. AK-CH 650 Capacity controller RS8ER302 © Danfoss 2016-02...
  • Page 46 We have decided to describe the setup by means of an example comprising a compressor group and a condenser. The example is the same as the one given in the "Design" section, i.e. the controller is an AK-CH 650 + extension modules. Compressor pack: • Refrigerant R404A •...

  • Page 47: Configuration

    The red alarm bell at the bottom right tells you that there is an active alarm in the controller. In our case the alarm is due to the fact that the time in the controller has not yet been set. AK-CH 650 Capacity controller RS8ER302 © Danfoss 2016-02...

  • Page 48: Authorization

    5. Carry out a new login with the user name and then You will access the login display by pressing the icon at the top left corner of the display. access code Capacity controller RS8ER302 © Danfoss 2016-02 AK-CH 650...
  • Page 49 The values can be changed when it is locked, but only for those settings that do not affect the configuration. 2. Select Lock/Unlock configuration 3. Select Configuration lock Press the blue field with the text Locked 4. Select Unlocked AK-CH 650 Capacity controller RS8ER302 © Danfoss 2016-02...

  • Page 50: System Setup

    When the controller is connected to a network, date and time will automatically be set by the system unit in the network. This also applies to change-over Daylight saving. 3. Set system settings Capacity controller RS8ER302 © Danfoss 2016-02 AK-CH 650...

  • Page 51: Set Plant Type

    Use Alarm output to High. (At ”High” the relay is only activated for high-priority alarms). The controller can transmit a 0-10 V signal that indicates how much of the compressor capacity is cutin. We do not use this signal in the example. AK-CH 650 Capacity controller RS8ER302 © Danfoss 2016-02...

  • Page 52: Set Control Of Compressors

    "Pump down limit" is reached. Pump down Select whether a pump down function is required on the last running compressor Capacity controller RS8ER302 © Danfoss 2016-02 AK-CH 650...
  • Page 53 Sd max limit Max. value for discharge gas temperature 10 K below the limit, the compressor capacity should be AK-CH 650 Capacity controller RS8ER302 © Danfoss 2016-02...
  • Page 54 "start before stop" or break time with "stop before start" (0-600 sec) Pump safety Select Common if monitored with flow switch Select Individual if DI-signals are received from relays Pump alarm delay Delay from drop out to alarm. Capacity controller RS8ER302 © Danfoss 2016-02 AK-CH 650...

  • Page 55: Setup Control Of Condenser

    PI-Control: The fan capacity is regulated by the PI controller. Capacity curve Choice of capacity curve type Linear: The same amplification in the entire area Square: Square curve shape, which gives higher amplification at higher loads. AK-CH 650 Capacity controller RS8ER302 © Danfoss 2016-02...
  • Page 56 ON: Tuning is completed and monitoring has commenced. OFF: Monitoring is cut out. FDD sensitivity Set the sensitivity of error-detection on the condenser’s air flow. Must only be changed by trained staff. Air flow tuning value Capacity controller RS8ER302 © Danfoss 2016-02 AK-CH 650...

  • Page 57: Setup Display

    Choose whether readings are to be in SI units (°C and bar) or (US-units °F and psi) In our example, separate displays 3. Define which readings are to be are not used. The setting is shown for the individual outputs included here for information. AK-CH 650 Capacity controller RS8ER302 © Danfoss 2016-02...

  • Page 58: Setup Defrost

    Comp.operation during defrost The schedule is located under the daily user Select whether the compressors are to run dur- interface. See page 72. ing defrosting. Capacity controller RS8ER302 © Danfoss 2016-02 AK-CH 650...

  • Page 59: Setup General Alarm Inputs

    No. of inputs Set the number of digital alarm inputs Adjust for each input • Name • Delay time for DI alarm (common value for all) • Alarm text AK-CH 650 Capacity controller RS8ER302 © Danfoss 2016-02...

  • Page 60: Setup Separate Thermostat Functions

    There are similar settings for up to 3 pressure switch functions. Via the +- button you can move to similar set- tings for the pressure control functions. (Not used in the example) Capacity controller RS8ER302 © Danfoss 2016-02 AK-CH 650...

  • Page 61: Setup Separate Voltage Functions

    For each voltage input defined the controller will reserve a relay output in the I/O setup. It is not necessary to define this relay if all you require is an alarm message via the data communication. AK-CH 650 Capacity controller RS8ER302 © Danfoss 2016-02...

  • Page 62: Configuration Of Inputs And Outputs

    Open has been selected here for all the safety circuits. This means that Press the +-button to go on to the the controller will receive signal under normal operation and register it next page as a fault if the signal is interrupted. Capacity controller RS8ER302 © Danfoss 2016-02 AK-CH 650...
  • Page 63 Heat recovery Saux 1 - 4 Paux 1 - 3 Voltage input 1 - 5 • 0 -5 V, • 0 -10 V, • 1 – 5 V, • 2 – 10 V AK-CH 650 Capacity controller RS8ER302 © Danfoss 2016-02...

  • Page 64: Set Alarm Priorities

    Press the +-button to go on to the next page 4. Set alarm priorities for condenser In our example we select the settings shown here in the display Press the +-button to go on to the next page Capacity controller RS8ER302 © Danfoss 2016-02 AK-CH 650...
  • Page 65 Configuration - continued 5. Set alarm priorities for thermostat and extra Digital signals In our example we select the settings shown here in the display AK-CH 650 Capacity controller RS8ER302 © Danfoss 2016-02...

  • Page 66: Lock Configuration

    The result can be seen in want to make any changes in the controller’s setup, remember first to the next section where the setup is controlled. unlock the configuration. Capacity controller RS8ER302 © Danfoss 2016-02 AK-CH 650...

  • Page 67: Check Configuration

    Press the +-button to go on to the next page 5. Check configuration of Analog Outputs Press the +-button to go on to the next page AK-CH 650 Capacity controller RS8ER302 © Danfoss 2016-02...
  • Page 68 Configuration - continued 6. Check configuration of Analog Inputs Capacity controller RS8ER302 © Danfoss 2016-02 AK-CH 650...

  • Page 69: Check Of Connections

    Check that the value of the alarm for the safety monitoring of compres- sor 1 changes to ON. The remaining digital inputs are checked in the same way. Press the +-button to go on to the next page AK-CH 650 Capacity controller RS8ER302 © Danfoss 2016-02...
  • Page 70 • The sensor has not been connected. • The sensor is short-circuited. • The point or module number has not been set up correctly. • The configuration is not locked. Capacity controller RS8ER302 © Danfoss 2016-02 AK-CH 650...

  • Page 71: Check Of Settings

    – the ones that can only be seen via the ”Scroll bar”. The last page contains safety limits and restart times. 4. Safety limits 5. Go back to the overview 6. Select condenser group AK-CH 650 Capacity controller RS8ER302 © Danfoss 2016-02...
  • Page 72 In the example, the defrost schedule has been set to two defrosts a day. Check the settings. 11. Go back to the overview and on to the general alarm inputs Check the settings. 12. The controller setup has been completed. Capacity controller RS8ER302 © Danfoss 2016-02 AK-CH 650...

  • Page 73: Schedule Function

    3. Setup schedule Press a weekday and set the time for the day period. Continue with the other days. A complete weekly sequence is shown in the display. AK-CH 650 Capacity controller RS8ER302 © Danfoss 2016-02...

  • Page 74: Installation In Network

    The wiring has not been carried out correctly. The termination has not been carried out correctly. The data communication requirements are described in the document: ”Data communication connections to ADAP-KOOL® Refrigeration Con- trols” RC8AC. Capacity controller RS8ER302 © Danfoss 2016-02 AK-CH 650...

  • Page 75: First Start Of Control

    Please note that active plant alarms are automatically cancelled when the main switch is in pos. OFF. If active alarms appear when the control is started the reason for these should be found and remedied. AK-CH 650 Capacity controller RS8ER302 © Danfoss 2016-02...

  • Page 76: Start The Control

    Press in the field against Main switch. Select ON. The controller will now start controlling the compressors and the fans. Note: Control does not start until both the internal and external switch are “ON”. Capacity controller RS8ER302 © Danfoss 2016-02 AK-CH 650...

  • Page 77: Manual Capacity Control

    3. Set capacity control to manual Press the blue field against Control mode Select MAN. 4. Set capacity in percent Press in the blue field against Manual capacity. Set the capacity to the required percentage. Press OK. AK-CH 650 Capacity controller RS8ER302 © Danfoss 2016-02...

  • Page 78: Manual Defrost

    Manual defrost 1. Go to Configuration menu If you want to perform a manual defrost, this can be done via the follow- ing operation. 2. Select defrost 3. Start defrost Capacity controller RS8ER302 © Danfoss 2016-02 AK-CH 650...

  • Page 79: Regulating Functions

    5. Regulating functions This section describes how the different functions work AK-CH 650 Capacity controller RS8ER302 © Danfoss 2016-02...

  • Page 80: Suction Group

    PI-control and control zones Requested capacity AK-CH 650 can control up to 6 compressors with up to 3 unloader The readout “Requested capacity” is the output from the PI valves each. One or two of the compressors can be equipped with controller and it shows the actual requested compressor capacity speed regulation.

  • Page 81: Reference For Compressor Control

    There are two delay times. One is activated under normal regu- lation, and the other is longer and is only activated during the cooling down phases — during start-up — after defrosting. AK-CH 650 Capacity controller RS8ER302 © Danfoss 2016-02...

  • Page 82: Capacity Distribution Methods

    (cut-out and cut-in compressors) due to a small change in capacity requirements, it is possible to set a minimum change in capacity requirement that will operate before the capac- ity distributor changes to a new compressor combination. Capacity controller RS8ER302 © Danfoss 2016-02 AK-CH 650...
  • Page 83 • For decreasing capacity, the compressor with the most operating hours is unloaded (C1). • When C1 is completely unloaded , compressor C2 with one-step is unloaded before C1 is cut out. AK-CH 650 Capacity controller RS8ER302 © Danfoss 2016-02...
  • Page 84 The capacity step will now be cut in and the required capacity determined by the controller. The start speed always ought to be set so high that a fast lubrication of the compressor is obtained during the start. Capacity controller RS8ER302 © Danfoss 2016-02 AK-CH 650...
  • Page 85 2 one step compressors of 20 kW Fixed capacity = 25 HZ / 50 HZ x 20 kW = 10 kW Variable capacity = 25 HZ / 50Hz x 20 kW = 10 kW AK-CH 650 Capacity controller RS8ER302 © Danfoss 2016-02...
  • Page 86 - Two speed-regulated compressors with a nominal capacity of out in accordance with the selected coupling pattern. 20 kW and frequency range 25-60 Hz - Two one-step compressors, each of 20 kW Capacity controller RS8ER302 © Danfoss 2016-02 AK-CH 650...

  • Page 87: Load Shedding

    When both load-shedding signals are active, the lowest limit value for the capacity will be the one that is applicable. Overriding of load shedding: To avoid load shedding leading to temperature problems for the chilled products, an overriding function is fitted. AK-CH 650 Capacity controller RS8ER302 © Danfoss 2016-02...

  • Page 88: Liquid Injection In Suction Line

    Time delay A time delay can be set which ensures that the injection is delayed during start up. Capacity controller RS8ER302 © Danfoss 2016-02 AK-CH 650...

  • Page 89: Defrost

    Stop by time Here a permanent defrost time is set. Once this time has elapsed, defrost is stopped. Manual stop A defrost in progress can be stopped manually by activating the "Stop defrost" function. AK-CH 650 Capacity controller RS8ER302 © Danfoss 2016-02...

  • Page 90: Safety Functions

    The cutout limit can be defined in the range from –30 to +100°C. The condensing pressure is measured with pressure transmitter Capacity controller RS8ER302 © Danfoss 2016-02 AK-CH 650...
  • Page 91 Delay on P0 min cut-out As further protection against cut-out at low pressure during star- tup, it is possible to delay the "P0 Min" cut-out. The delay time can be set via "P0 Min. fors". AK-CH 650 Capacity controller RS8ER302 © Danfoss 2016-02...

  • Page 92: Pump Control

    Here too, set an alarm delay time that applies during startup and on pump changeover. The delay time is to ensure that on startup/pump changeover, no error is signalled for a pump before brine flow has been estab- lished. Capacity controller RS8ER302 © Danfoss 2016-02 AK-CH 650...

  • Page 93: Condenser

    The increase in capacity produced by each extra step decreases gradually as more and more steps are cut in. This means that the capacity controller requires more amplifica- tion at high capacities than at low capacities. Consequently, the AK-CH 650 Capacity controller RS8ER302 © Danfoss 2016-02...

  • Page 94: Reference For Condensing Pressure

    In this instance, the heat recovery function is activated via an external signal from, for example a building management system. When the function is activated the reference for the condenser temperature will be raised to a set value and the Capacity controller RS8ER302 © Danfoss 2016-02 AK-CH 650...

  • Page 95: Capacity Distribution

    If additional capacity is required, the next fan cuts in at the same time as the first fan switches to minimum speed. From here, the first fan can increase speed again, etc. AK-CH 650 Capacity controller RS8ER302 © Danfoss 2016-02...

  • Page 96: Condenser Couplings

    This is accomplished by tuning the function when the condenser is clean. The tuning must not be started until the plant has been run in and runs under normal operation conditions. Capacity controller RS8ER302 © Danfoss 2016-02 AK-CH 650...

  • Page 97: General Monitoring Functions

    Alarm limits can be set for low and high pressure, respectively, including separate alarm delays. The individual pressure control function can be adapted to the relevant application as it is possible to give the pressure control a name and indicate alarm texts. AK-CH 650 Capacity controller RS8ER302 © Danfoss 2016-02...

  • Page 98: Miscellaneous

    Instead you use the PC ref. min. value as reference. • S7 error: See page 93. NB: An incorrect sensor must be in order for 10 minutes before the sensor alarm deactivates. Capacity controller RS8ER302 © Danfoss 2016-02 AK-CH 650...
  • Page 99 State a password c) Select user level Via AK-ST 500 service tool software one can: d) Select units – either US (e.g. °F and PSI) or Danfoss SI (°C and Bar) a) Select up to 10 parameter values the controller will...
  • Page 100 S3 temperature ■ DO7 Constant ON = Active alarm/cancelled Actual media temperature measured with S4 ■ DO8 ■ Service Pin Superheat in suction line Network installation Sc3 out door temperature in °C Capacity controller RS8ER302 © Danfoss 2016-02 AK-CH 650...

  • Page 101: Appendix A - Compressor Combinations And Coupling Patterns

    - The capacity controlled compressor is the first to start and the last to stop. - Unloader valves are used to close capacity holes - There is operating time equalizing between the compressors 2 and 3 (same size in example). AK-CH 650 Capacity controller RS8ER302 © Danfoss 2016-02...
  • Page 102 - Operating hours are equalised between the capacity-regulated compressors - The unload valve on the capacity-regulated compressor is used to fill capacity gaps - Operating hours are equalised between the one-step compres- sors 3 and 4. Capacity controller RS8ER302 © Danfoss 2016-02 AK-CH 650...
  • Page 103 The speed-regulated compressor is always the first to start and last to stop. The capacity distributor cuts in and cuts out the one-step com- pressors in order to achieve the best possible capacity fit (least AK-CH 650 Capacity controller RS8ER302 © Danfoss 2016-02...
  • Page 104 - When the main step or unload valves are cut in, the speed is re- duced on the speed-regulated compressor (35 Hz) is equivalent to the capacity of the cut in capacity. Capacity controller RS8ER302 © Danfoss 2016-02 AK-CH 650...
  • Page 105 (C1) is cut out (C1) - The last speed-regulated compressor (C2) is cut out when the Decreasing capacity: requirements for this are fulfilled - The one-step compressor with the most operating time (C3) AK-CH 650 Capacity controller RS8ER302 © Danfoss 2016-02...
  • Page 106 - The small speed-regulated compressor (C1) is cut out when the conditions for this are met. - When the one-step compressors are cut out, the speed-regulat- ed compressors' speed increases (63.3 Hz) equivalent to the cut out capacity. Capacity controller RS8ER302 © Danfoss 2016-02 AK-CH 650...
  • Page 107 AK-CH 650 Capacity controller RS8ER302 © Danfoss 2016-02...

  • Page 108: Appendix B - Alarm Texts

    Fan Alarm 1 Fan no. X is reported defective via safety input Fan/VSD safety Medium Fan VSD alarm Variable speed drive for condenser fans has been cut out on safety Capacity controller RS8ER302 © Danfoss 2016-02 AK-CH 650...
  • Page 109 The in put in question has been put in manual control mode via the AK-ST 500 service tool software MAN DO……… The output in question has been put in manual control mode via the AK-ST 500 service tool software AK-CH 650 Capacity controller RS8ER302 © Danfoss 2016-02...

  • Page 110: Recommended Connection

    Module 2 - Comp. 1 Comp. 2 Comp. 3 AK-XM 102B safety safety safety Module 3 - Fan 1 Fan 2 Fan 3 Fan 4 Fan 5 Fan 6 AK-XM 204_ Capacity controller RS8ER302 © Danfoss 2016-02 AK-CH 650...

  • Page 111: Ak-Ch

    Comp. 3 Comp. 4 Pump 1 Pump 2 Unload.1 Unload.2 Comp. 1 Comp. 1 Comp. 2 Comp. 2 Comp. 3 Comp. 3 Pump 1 Pump 2 Unload.1 Unload.1 Unload.1 Liquid injec- tion AK-CH 650 Capacity controller RS8ER302 © Danfoss 2016-02...
  • Page 112 Comp. 1 Comp. 2 Comp. 3 Comp. 4 VSD. 1 VSD. 2 AK-XM 102B safety safety safety safety safety safety Module 3 - Fan 1 Fan 2 Fan 3 Fan 4 AK-XM 204_ Capacity controller RS8ER302 © Danfoss 2016-02 AK-CH 650...
  • Page 113 Comp. 1 Comp. 2 Liquid Pump 1 Pump 2 Comp. injec- speed tion Comp. 1 Comp. 2 Comp. 3 Comp. 4 Liquid Pump 1 Pump 2 Comp. injec- speed tion AK-CH 650 Capacity controller RS8ER302 © Danfoss 2016-02...
  • Page 114 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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