Danfoss AK-PC 781 User Guide

Introduction and Overview

This document provides a user guide for the Danfoss AK-PC 781 capacity controller with heat recovery, part of the ADAP-KOOL® Refrigeration control systems. It details the menu operations, system validity, function groups, measurements, settings, and various control functions.

Menu List and Operation

The menu function can be used with system software type AKM. The description is divided into function groups displayed on the PC screen, allowing users to view measured values or settings. For AKM usage, refer to the AKM Manual.

Validity: This menu operation (from March 2013) applies to controller type AK-PC 781, code numbers 080Z0186 / 080Z0187 / 080Z0188 / 080Z0189 / 080Z0190 with programme version 4.1x.

The operation is divided into several function groups. Selecting a group and pressing "OK" allows navigation to the next display. For example, "Suction capacity control" can be selected.

Measured values are displayed on the "measure line" and are constantly updated. Settings are shown in a list; to change a setting, select the parameter and press "OK".

Measurements: Various measurements can be read directly. A graphic display of up to eight measurements can be shown by selecting them and pressing "Trend".

Settings: Settings can only be made for daily operation. Configuration settings are not visible, changeable, or writable via this interface; they must be made using the Service Tool program. Settings include ON/OFF, variable values, time settings, and "reset alarms".

User Interface Example: AKC Controllers - Functions menu screen showing groups like Alarms, Main settings, Suction capacity control, etc., with options to select Default, Logs, Alarms, OK, and Close.

User Interface Example: Suction capacity control screen showing Measurements and Settings tabs. The Measurements tab displays parameters like AK error, Comp. ctrl. temp °C, Compressor cap. %, etc. The Settings tab displays parameters like Main switch, Manual capacity %, Cap. control mode, etc.

User Interface Example: Setting a value, showing "New value" input field and "OK"/"Cancel" buttons.

Documentation and Functions

Settings can be made for individual functions. Once settings are made for one controller, they can be copied to other controllers of the same type and software version using the AKM program's "copy settings" function, with subsequent adjustments for deviations.

A printout of individual settings can be generated using the AKM program's function. Refer to the "Documentation" section for details.

Documentation: Settings of individual controllers can be documented using the AKM program's print function. Select the controller and then the "Print Settings" function (refer to the AKM Manual).

User Interface Example: AKM Menu showing options like Plant overview, History, Configuration, Controllers, Copy Settings, Print Settings, Programming, etc.

Functions: Function groups with corresponding measurements and settings are shown. A printout of given settings can be made using the AKM function "Print Settings".

Note: Selections are made from many available measurements and settings. The AKM program does not contain all functions. For access to all measurements and settings, use Service Tool type AK-ST 500.

Main Settings

Measurements

• AK error: When "ON", the controller is in alarm condition.
• Comp. ctrl. temp °C: Actual temperature for control sensor (Po or S4).
• Comp. ctrl. ref. °C: Actual reference temp. for compressor capacity (incl. external reference signal, if any).
• Compressor cap. %: Cut-in compressor capacity in % (of total capacity).
• Request Compr. Cap %: Reference for compressor capacity (deviations may be due to time delays).
• P0 °C: Suction pressure in °C. (Measured with the pressure transmitter).
• Ss Suction gas °C: Actual suction gas temperature.
• Cond. ctrl. temp °C: Actual temperature for control sensor (Pc or S7).
• Cond. ctrl. ref. °C: Actual reference temp. for condenser capacity (incl. external contributions, if any).
• Cond. cap. %: Cut-in condenser capacity in % (of total capacity).
• Request Cond. cap %: Reference for condenser capacity.
• Pc Bar: Condensing pressure (measured with the pressure transmitter).
• Tc °C: Condensing pressure in °C. (measured with the pressure transmitter).
• Gc status: Actual gas cooler operation: 0=Off, 1=Standby, 2=Max COP operation, 3=Heat recovery, 4=Extra capacity, 5=Manual control.
• Pgc Bar: Actual gas cooler pressure.
• Pgc reference bar: Actual reference for gas cooler pressure.
• Sd discharge gas °C: Actual discharge gas temperature.
• Sgc °C: Actual temperature at outlet from the gas cooler.
• External Main Switch: Status of input "Extern Main Switch". In pos. "OFF" the regulation is stopped by force.

Settings

• Main switch: ON: Regulation, OFF: Controller stopped.
• Configuration lock: Lock of configuration. In order to select quick setup or select refrigerant type, the configuration lock must be "open". Note: "Main switch" must be OFF in order to set configuration lock in "open" position. 0: Open, 1: Locked.
• Refrigerant type Po: Select refrigerant type. Codes: 0= not selected, 1=R12, 2=R22, 3=R134a, 4=R502, 5=R717, 6=R13, 7=R13b1, 8=R23, 9=R500, 10=R503, 11=R114, 12=R142b, 13=User defined, 14=R32, 15=R227, 16=R401A, 17=R507, 18=R402A, 19=R404A, 20=R407C, 21=R407A, 22=R407B, 23=R410A, 24=R170, 25=R290, 26=R600, 27=R600a, 28=R744, 29=R1270, 30=R417A, 31=R422A, 32=R413A, 33=R422D, 34=R427A, 35=R438A, 36=XP10, 37=R407F.

Suction Capacity Control

Measurements

• AK error: When "ON", the controller is in alarm condition.
• Comp. ctrl. temp °C: Actual temperature for control sensor (Po or S4).
• Comp. ctrl. ref. °C: Actual reference temp. for compressor capacity (incl. external reference signal, if any).
• Compressor cap. %: Cut-in compressor capacity in % (of total capacity).
• Request Compr. Cap %: Reference for compressor capacity (deviations may be due to time delays).
• P0 °C: Suction pressure in °C. (Measured with the pressure transmitter).
• Ss Suction gas °C: Actual suction gas temperature.
• Cond. ctrl. temp °C: Actual temperature for control sensor (Pc or S7).
• Cond. ctrl. ref. °C: Actual reference temp. for condenser capacity (incl. external contributions, if any).
• Cond. cap. %: Cut-in condenser capacity in % (of total capacity).
• Request Cond. cap %: Reference for condenser capacity.
• Pc Bar: Condensing pressure (measured with the pressure transmitter).
• Tc °C: Condensing pressure in °C. (measured with the pressure transmitter).
• Gc status: Actual gas cooler operation: 0=Off, 1=Standby, 2=Max COP operation, 3=Heat recovery, 4=Extra capacity, 5=Manual control.
• Pgc Bar: Actual gas cooler pressure.
• Pgc reference Bar: Actual reference for gas cooler pressure.
• Sd discharge gas °C: Actual discharge gas temperature.
• Sgc °C: Actual temperature at outlet from the gas cooler.
• MC dP0 offset K: Actual displacement value for the suction pressure in connection with a "P0 Optimiser" function (Master control function in AKA gateway).

Settings

• Main switch: ON: Regulation, OFF: Controller stopped.
• Cap. control mode: 0: MAN (Compressor capacity controlled manually), 1: OFF (Capacity control stopped), 2: AUTO (Capacity controlled by PI controller).
• Manual capacity %: Manual setting of compressor capacity. Value in % of total capacity controlled by the controller.
• Reference mode: Displacement of suction pressure as a function of external signals. 0: Reference = set reference + night offset + offset from external 0-10 V signal. 1: Reference = set reference + offset from P0 optimization + night offset.

Settings - General Parameters

Measurements

• S4 media temp. °C: Actual media temperature measured at S4 sensor (Only used if S4 is selected as control sensor).
• Pctrl °C: Actual regulation pressure measured with Pctrl pressure transmitter (cascade pressure).
• Suction status: 0: Power up (Controller powered up), 1: Stopped (Capacity control stopped), 2: Manual (Capacity controlled manually), 3: Alarm (Capacity control in alarm condition), 4: Restart (Waiting for "Restart time"), 5: Standby (Ready to start), 6: State off timer, 7-10: State on timer, 11: Unloaded, 12-14: Unload cutin, 15: Full loaded (All capacity cutin), 16: Running (Capacity control is running).
• Actual Zone: Actual zone for capacity regulation: 0: PO-error, 1: - - Zone, 2: - Zone, 3: NZ, 4: + Zone, 5: + + Zone.
• Suction superheat K: Actual superheat.
• Night Setback: Status of night setback function. ON: Night (increase of evaporating pressure permitted), OFF: Normal situation.
• Load shed 1: Actual status on Load shed input 1.
• Load shed 2: Actual status on Load shed input 2.
• Injection ON: Status of the "Injection ON" function.
• MT release output: Actual status on "Comp. release" output signal from MT controller.
• MT request input: Actual status on "Comp. request" input signal on MT controller.
• LT request output: Actual status on "Comp. request" output signal from LT controller.
• LT release input: Actual status on "Comp. release" input signal on LT controller.
• No. of compressors: Defined number of compressors.
• Comp. application: Select the compressor application required (see manual for details). Options: 0: Single step only, 1: 1xComp. w. unloaders + Single step, 2: 2xComp. w. unloaders + Single step, 3: Comp. w. unloaders only, 4: 1xVariable speed + Single step, 5: 1xVariable speed + Comp. w. unloaders, 6: 2xVariable speed + Single step.
• Step control mode: Selected coupling pattern for compressors. Options: Sequential (cut in/out by compressor number), Cyclic (runtime equalisation), Best fit (optimal fit to load). 0: Sequential, 2: Cyclic, 3: Best fit.

Settings

• Main switch: ON: Regulation, OFF: Controller stopped.
• Cap. control mode: 0: MAN (Compressor capacity controlled manually), 1: OFF (Capacity control stopped), 2: AUTO (Capacity controlled by PI controller).
• Manual capacity %: Manual setting of compressor capacity. Value in % of total capacity controlled by the controller.
• Reference mode: Displacement of suction pressure as a function of external signals. 0: Reference = set reference + night offset + offset from external 0-10 V signal. 1: Reference = set reference + offset from P0 optimization + night offset.

Settings - Pressure and Temperature Parameters

Measurements

• Setpoint °C: Setting of required suction pressure in °C.
• Min.Reference °C: Min. permissible suction pressure reference.
• Max.Reference °C: Max. permissible suction pressure reference.
• Night offset K: Displacement value for suction pressure in connection with an active night setback signal (set in Kelvin).
• ++Zone delay s: Time delay between step cut-ins in the regulation band over the "+Zone band". Set in seconds.
• +Zone delay s: Time delay between step cut-ins in the regulation band over the neutral zone. Set in seconds.
• +Zone band K: Regulation band over the neutral zone.
• Neutral zone K: Neutral zone for suction pressure.
• -Zone band K: Regulation band under the neutral zone.
• -Zone delay s: Time delay between step cut-outs in the regulation band under the neutral zone. Set in seconds.
• --Zone delay s: Time delay between step cut-outs in the regulation band under the "-Zone band". Set in seconds.
• Kp Po: Amplification factor for P0 regulation.
• VSD Min. speed Hz: Minimum allowed speed before stop of Variable Speed drive (Low load condition).
• VSD Start speed Hz: Minimum speed for start of Variable speed drive (Must be set higher than "VSD Min. Speed Hz").
• VSD Max. speed Hz: Highest permissible speed for the compressor motor.
• Sd max. limit °C: Alarm at too high Sd.
• Sd comp. alarm delay: Time delay for Sd alarm.
• P0 min. limit °C: Alarm at too low P0.
• P0 max. alarm °C: Alarm at too high P0.
• P0 max. delay m: Time delay for P0 alarm.
• SH min. alarm K: Alarm at too low superheat.
• SH max. alarm K: Alarm at too high superheat.
• SH alarm delay m: Time delay for SH alarm.
• Load shed limit 1: Set max capacity limit for load shed input 1.
• Load shed limit 2: Set max capacity limit for load shed input 2.
• MT release delay s: Time delay on output signal "Comp. release" on MT controller.
• MT request delay s: Time delay on input signal for "Comp. request" on MT controller.
• LT request delay s: Time delay on output signal "Comp. request" on LT controller.
• LT release delay s: Time delay on input signal for "Comp. release" on LT controller.
• Po pump down: Select if a pump down function on the last compressor is requested.
• Po pump down limit °C: Set the actual pump down limit for the last compressor.
• Initial start time: The time after start-up where the cut-in capacity is limited to the first compressor step.
• Safety restart time: Time delay before restart of compressors.

Suction Compressor Status

Measurements

• AK error: When "ON", the controller is in alarm condition.
• Comp. ctrl. temp °C: Actual temperature for control sensor (Po or S4).
• Comp. ctrl. ref. °C: Actual reference temp. for compressor capacity (incl. external reference signal, if any).
• Compressor cap. %: Cut-in compressor capacity in % (of total capacity).
• Request Comp. Cap %: Reference for compressor capacity (deviations may be due to time delays).
• P0 °C: Suction pressure in °C. (Measured with the pressure transmitter).
• Ss Suction gas °C: Actual suction gas temperature.
• Cond. ctrl. temp °C: Actual temperature for control sensor (Pc or S7).
• Cond. ctrl. ref. °C: Actual reference temp. for condenser capacity (incl. external contributions, if any).
• Cond. cap. %: Cut-in condenser capacity in % (of total capacity).
• Request Cond. cap %: Reference for condenser capacity.
• Pc Bar: Condensing pressure (measured with the pressure transmitter).
• Tc °C: Condensing pressure in °C. (measured with the pressure transmitter).
• Gc status: Actual gas cooler operation: 0=Off, 1=Standby, 2=Max COP operation, 3=Heat recovery, 4=Extra capacity, 5=Manual control.
• Pgc Bar: Actual gas cooler pressure.
• Pgc reference Bar: Actual reference for gas cooler pressure.
• Sd discharge gas °C: Actual discharge gas temperature.
• Sgc °C: Actual temperature at outlet from the gas cooler.
• VSD 1 safety: Status on safety input for variable speed controller on compressor 1. ON: Alarm, OFF: No alarm.
• VSD 2 safety: Status on safety input for variable speed controller on compressor 2. ON: Alarm, OFF: No alarm.
• VSD Speed %: The present speed of the compressor motor controlled by the frequency converter.
• Comp. 1 Status: 0: Power up, 1: Stopped, 2: Manual, 3: Alarm, 4: Restart, 5: Standby, 6-10: Status_RUN_Timer, 11: unloaded, 12-14: Unloads cutin, 15: Full loaded (All capacity cutin), 16: Running (Capacity control is running).
• Comp 2 ... Status: As above for compressor no. 2 to 8.
• Comp 1 capacity %: Actual cut-in capacity on this compressor.
• Comp 2 ...capacity %: As above for compressor no. 2 to 8.
• Comp 1 Cycles / 24 h: Number of compressor starts during the past 24 hours.
• Comp 2 ... Cycles / 24 h: As above for compressor no. 2 to 8.

Settings

• Main switch: ON: Regulation, OFF: Controller stopped.
• 1 Min. ON-time m: Minimum duration of ON period.
• 2...Min. ON-time m: As above for compressor no. 2 to 8.
• 1 Min. OFF-time m: Minimum duration of OFF period.
• 2... Min. OFF-time m: As above for compressor no. 2 to 8.
• 1 Recycle time m: Minimum period of time between two successive starts.
• 2... Recycle time m: As above for compressor no. 2 to 8.
• 1 runtime h: Compressor's total run time in hours.
• 2...runtime h: As above for compressor no. 2 to 8.

High Pressure Control

Measurements

• AK error: When "ON", the controller is in alarm condition.
• Comp. ctrl. temp °C: Actual temperature for control sensor (Po or S4).
• Comp. ctrl. ref. °C: Actual reference temp. for compressor capacity (incl. external reference signal, if any).
• Compressor cap. %: Cut-in compressor capacity in % (of total capacity).
• Request Comp. Cap %: Reference for compressor capacity (deviations may be due to time delays).
• P0 °C: Suction pressure in °C. (Measured with the pressure transmitter).
• Ss Suction gas °C: Actual suction gas temperature.
• Cond. ctrl. temp °C: Actual temperature for control sensor (Pc or S7).
• Cond. ctrl. ref. °C: Actual reference temp. for condenser capacity (incl. external contributions, if any).
• Cond. cap. %: Cut-in condenser capacity in % (of total capacity).
• Request Cond. cap %: Reference for condenser capacity.
• Pc Bar: Condensing pressure (measured with the pressure transmitter).
• Tc °C: Condensing pressure in °C. (measured with the pressure transmitter).
• Gc status: Actual gas cooler operation: 0=Off, 1=Standby, 2=Max COP operation, 3=Heat recovery, 4=Extra capacity, 5=Manual control.
• Pgc Bar: Actual gas cooler pressure.
• Pgc reference Bar: Actual reference for gas cooler pressure.
• Sd discharge gas °C: Actual discharge gas temperature.
• Sgc °C: Actual temperature at outlet from the gas cooler.
• Shp °C: Read temperature at high pressure valve.
• Vhp OD%: Read opening degree of high pressure valve.

Settings

• Rec. Status: 0: Off, 1: Standby, 2: Normal, 3: Emergency operation, 4: Manual.
• Prec Bar: Read pressure of receiver.
• Vrec OD%: Read opening degree of receiver valve.
• Main switch: ON: Regulation, OFF: Controller stopped.
• HP control ManAut: Control of high pressure valve: 1=automatic, 2=manual override.
• Vhp manual OD%: Manual setting of opening degree of high pressure valve.
• Pgc min. Bar: Setting of gas coolers min. pressure.
• Pgc max. Bar: Setting of gas coolers max. pressure.
• Extra capacity offs: Set requested pressure increase if the "extra cooling capacity" is activated.
• dT Subcool K: Set requested sub cooling in the sub critical range.
• Rec. Control ManAut: Control of receiver valve: 1=automatic, 2=manual override.
• Rec. Manual OD%: Manual setting of opening degree of the receiver valve.
• Prec setpoint Bar: Set requested receiver pressure.

Oil Management

Measurements

• AK error: When "ON", the controller is in alarm condition.
• Comp. ctrl. temp °C: Actual temperature for control sensor (Po or S4).
• Comp. ctrl. ref. °C: Actual reference temp. for compressor capacity (incl. external reference signal, if any).
• Compressor cap. %: Cut-in compressor capacity in % (of total capacity).
• Request Comp. Cap %: Reference for compressor capacity (deviations may be due to time delays).
• P0 °C: Suction pressure in °C. (Measured with the pressure transmitter).
• Ss Suction gas °C: Actual suction gas temperature.
• Cond. ctrl. temp °C: Actual temperature for control sensor (Pc or S7).
• Cond. ctrl. ref. °C: Actual reference temp. for condenser capacity (incl. external contributions, if any).
• Cond. cap. %: Cut-in condenser capacity in % (of total capacity).
• Request Cond. cap %: Reference for condenser capacity.
• Pc Bar: Condensing pressure (measured with the pressure transmitter).
• Tc °C: Condensing pressure in °C. (measured with the pressure transmitter).
• Gc status: Actual gas cooler operation: 0=Off, 1=Standby, 2=Max COP operation, 3=Heat recovery, 4=Extra capacity, 5=Manual control.
• Pgc Bar: Actual gas cooler pressure.
• Pgc reference Bar: Actual reference for gas cooler pressure.
• Sd discharge gas °C: Actual discharge gas temperature.
• Sgc °C: Actual temperature at outlet from the gas cooler.
• Rec. pressure: Actual pressure in receiver.
• Rec. pres. buildup: Status of oil separator.

Settings

• Main switch: ON: Regulation, OFF: Controller stopped.
• Interval time: Time between breaks. (Simple oil equalisation).
• Equalisation time: Duration of oil equalisation (Simple oil equalisation).
• Rec. pres. cutin Bar: Reciever pressure, which to cutin for the oil.
• Rec.pres.cutout Bar: Receiver pressure, which to cutout for the oil.
• High alarm limit Bar: Alarm limit high.
• Low alarm limit Bar: Alarm limit low.
• High alarm delay m: Delay time for high pressure alarm.
• Low alarm delay m: Delay time for low pressure alarm.
• Lvl. alarm delay s: Delay time for Level alarm.

Condenser Capacity Control

Measurements

• AK error: When "ON", the controller is in alarm condition.
• Comp. ctrl. temp °C: Actual temperature for control sensor (Po or S4).
• Comp. ctrl. ref. °C: Actual reference temp. for compressor capacity (incl. external reference signal, if any).
• Compressor cap. %: Cut-in compressor capacity in % (of total capacity).
• Request Comp. Cap %: Reference for compressor capacity (deviations may be due to time delays).
• P0 °C: Suction pressure in °C. (Measured with the pressure transmitter).
• Ss Suction gas °C: Actual suction gas temperature.
• Cond. ctrl. temp °C: Actual temperature for control sensor (Pc or S7).
• Cond. ctrl. ref. °C: Actual reference temp. for condenser capacity (incl. external contributions, if any).
• Cond. cap. %: Cut-in condenser capacity in % (of total capacity).
• Request Cond. cap %: Reference for condenser capacity.
• Pc Bar: Condensing pressure (measured with the pressure transmitter).
• Tc °C: Condensing pressure in °C. (measured with the pressure transmitter).
• Gc status: Actual gas cooler operation: 0=Off, 1=Standby, 2=Max COP operation, 3=Heat recovery, 4=Extra capacity, 5=Manual control.
• Pgc Bar: Actual gas cooler pressure.
• Pgc reference Bar: Actual reference for gas cooler pressure.
• Sd discharge gas °C: Actual discharge gas temperature.
• Sgc °C: Actual temperature at outlet from the gas cooler.
• Tc max. limit °C: Readout limit value for max condenser pressure.
• S7 brine temp °C: Actual media temperature measured at S7 sensor (Only used if S7 is selected as control sensor).
• Condenser status: 0: Power up, 1: Stopped, 2: Manual, 3: Alarm, 4: Restart, 5: Standby, 6: Unloaded, 7-9: Part loaded, 10: Full loaded (All capacity cutin), 11: Running (Capacity control is running).
• Air flow status: 0: No RFG (monitoring of air flow cannot start), 1: Tuning (Monitoring function adapts to condenser), 2: OFF (Monitoring function switched OFF), 3: OK (Air flow is OK), 4: Little dirt (Decreases condenser performance, clean when possible), 5: Dirty (Considerable air flow problems, clean as soon as possible), 6: Blocking (High pressure problems, clean now).
• Sc3 Air on °C: Outdoor temperature in °C measured with Sc3 temperature sensor.
• No. of fans: Defined number of fans.
• VSD Speed %: Status of analogue output signal "AO" for variable speed drive (in percent of full scale f.ex. 0-10 V d.c.).
• VSD safety: Status of safety monitoring input for Variable Speed Drive. ON: Alarm on VSD A safety monitoring input, OFF: No alarm on VSD A safety monitoring input.

Settings

• Main switch: ON: Regulation, OFF: Controller stopped.
• Condenser ctrl mode: 0: MAN (Condenser capacity controlled manually), 1: OFF (Capacity control stopped), 2: AUTO (Capacity controlled by PI controller).
• Manual capacity %: Manual setting of condenser capacity. Value in % of total capacity controlled by the controller.
• Pc Ref. mode: 0: Set point (Reference = "PcA setpoint °C"), 1: Floating (Reference changed based on outdoor temp, "Dimensioning tm K", and compressor load).
• Cond. Setpoint °C: Setting of required discharge pressure in °C.
• Dimensioning tm K: Dimensioning mean temperature differential between air- and condensing temperature at full load (Typical 8 – 15K).

Condenser Fan Status

Measurements

• AK error: When "ON", the controller is in alarm condition.
• Comp. ctrl. temp °C: Actual temperature for control sensor (Po or S4).
• Comp. ctrl. ref. °C: Actual reference temp. for compressor capacity (incl. external reference signal, if any).
• Compressor cap. %: Cut-in compressor capacity in % (of total capacity).
• Request Compr. Cap %: Reference for compressor capacity (deviations may be due to time delays).
• P0 °C: Suction pressure in °C. (Measured with the pressure transmitter).
• Ss Suction gas °C: Actual suction gas temperature.
• Cond. ctrl. temp °C: Actual temperature for control sensor (Pc or S7).
• Cond. ctrl. ref. °C: Actual reference temp. for condenser capacity (incl. external contributions, if any).
• Cond. cap. %: Cut-in condenser capacity in % (of total capacity).
• Request Cond. cap %: Reference for condenser capacity.
• Pc Bar: Condensing pressure (measured with the pressure transmitter).
• Tc °C: Condensing pressure in °C. (measured with the pressure transmitter).
• Gc status: Actual gas cooler operation: 0=Off, 1=Standby, 2=Max COP operation, 3=Heat recovery, 4=Extra capacity, 5=Manual control.
• Pgc bar: Actual gas cooler pressure.
• Pgc reference bar: Actual reference for gas cooler pressure.
• Sd discharge gas °C: Actual discharge gas temperature.
• Sgc °C: Actual temperature at outlet from the gas cooler.
• Fan1/VSD status: Status of the Fan 1. ON: Fan is running, OFF: Fan is not running.
• Fan2.... status: As above for fan 2 to 8.

Settings

• Main switch: ON: Regulation, OFF: Controller stopped.

Heat Recovery

Measurements

• AK error: When "ON", the controller is in alarm condition.
• Comp. ctrl. temp °C: Actual temperature for control sensor (Po or S4).
• Comp. ctrl. ref. °C: Actual reference temp. for compressor capacity (incl. external reference signal, if any).
• Compressor cap. %: Cut-in compressor capacity in % (of total capacity).
• Request Compr. Cap %: Reference for compressor capacity (deviations may be due to time delays).
• P0 °C: Suction pressure in °C. (Measured with the pressure transmitter).
• Ss Suction gas °C: Actual suction gas temperature.
• Cond. ctrl. temp °C: Actual temperature for control sensor (Pc or S7).
• Cond. ctrl. ref. °C: Actual reference temp. for condenser capacity (incl. external contributions, if any).
• Cond. cap. %: Cut-in condenser capacity in % (of total capacity).
• Request Cond. cap %: Reference for condenser capacity.
• Pc Bar: Condensing pressure (measured with the pressure transmitter).
• Tc °C: Condensing pressure in °C. (measured with the pressure transmitter).
• Gc status: Actual gas cooler operation: 0=Off, 1=Standby, 2=Max COP operation, 3=Heat recovery, 4=Extra capacity, 5=Manual control.
• Pgc Bar: Actual gas cooler pressure.
• Pgc reference Bar: Actual reference for gas cooler pressure.
• Sd discharge gas °C: Actual discharge gas temperature.
• Sgc °C: Actual temperature at outlet from the gas cooler.
• Shr2 °C: (ONLY at CO2). Temperature at sensor Shr2.
• Stw2 °C: (ONLY at CO2). Temperature at sensor Stw2.
• Status heat circuit: (ONLY at CO2). 0=off, 1=waiting, 2=started, 3=standard, 4=variable offset, 5=max recovery, 6=stopped, 7=error.
• Tw Stw8 °C: (ONLY at CO2). Temperature at sensor Stw8. Tap water.
• Tw Status: (ONLY at CO2). 0=off, 1=waiting, 2=started, 3=hot tap water, 5=manual, 6= stopped, 7=error, 8=Flow error, 9=sensor error, 10=boiling.
• Tw enable: (ONLY at CO2). Readout about tap water circuit can be activated automatically.
• Hr Shr8 °C: (ONLY at CO2). Temperature at sensor Shr8. Heat circuit.
• Hr Status: (ONLY at CO2). 0=off, 1=waiting, 2=started, 3=heat circuit, 5=manual, 6= stopped, 7=error, 8=Flow error, 9=sensor error, 10=boiling.
• Hr enable: (ONLY at CO2). Readout about heat circuit can be activated automatically.
• HR thermostat temp°C: (Not at CO2). Actual temperature at sensor for heat recovery function.
• Heat recovery status: (Not at CO2). Status on heat recovery function (on/off).

Settings

• Main switch: ON: Regulation, OFF: Controller stopped.
• Tw setpoint °C: (ONLY at CO2). Set point for tap water temperature.
• Hr setpoint °C: (ONLY at CO2). Set point for heat circuit temperature.
• Pgc HR max. offset: (ONLY at CO2). Displacement pressure of max. signal.
• Pgc HR min. Bar: (ONLY at CO2). Set point at min. signal.
• Heat recovery SP °C: (Not at CO2). Reference for condenser pressure when heat recovery is on.
• HR temp. cutin °C: (Not at CO2). Temperature value when thermostat switch to heat recovery.
• HR temp. cutout °C: (Not at CO2). Temperature value when thermostat switch off the heat recovery.

Alarm Priorities

Measurements

• AK error: When "ON", the controller is in alarm condition.
• Comp. ctrl. temp °C: Actual temperature for control sensor (Po or S4).
• Comp. ctrl. ref. °C: Actual reference temp. for compressor capacity (incl. external reference signal, if any).
• Compressor cap. %: Cut-in compressor capacity in % (of total capacity).
• Request Comp. Cap %: Reference for compressor capacity (deviations may be due to time delays).
• P0 °C: Suction pressure in °C. (Measured with the pressure transmitter).
• Ss Suction gas °C: Actual suction gas temperature.
• Cond. ctrl. temp °C: Actual temperature for control sensor (Pc or S7).
• Cond. ctrl. ref. °C: Actual reference temp. for condenser capacity (incl. external contributions, if any).
• Cond. cap. %: Cut-in condenser capacity in % (of total capacity).
• Request Cond. cap %: Reference for condenser capacity.
• Pc Bar: Condensing pressure (measured with the pressure transmitter).
• Tc °C: Condensing pressure in °C. (measured with the pressure transmitter).
• Gc status: Actual gas cooler operation: 0=Off, 1=Standby, 2=Max COP operation, 3=Heat recovery, 4=Extra capacity, 5=Manual control.
• Pgc Bar: Actual gas cooler pressure.
• Pgc reference Bar: Actual reference for gas cooler pressure.
• Sd discharge gas °C: Actual discharge gas temperature.
• Sgc °C: Actual temperature at outlet from the gas cooler.

Settings

• Main switch: ON: Regulation, OFF: Controller stopped.
• Main Switch Low P0: The alarm priority of the following alarms can be changed: High priority (1), Medium priority (2), Low priority (3), Log only (4), Overriding alarms (0). Values: 0/1/2/3/4.

Alarm Priorities - Detailed List

• High P0: 0/1/2/3/4
• High Pc/Sd: 0/1/2/3/4
• Hpcontrol / Receive: 0/1/2/3/4
• Superheat Min/Max: 0/1/2/3/4
• Load shedding: 0/1/2/3/4
• P0/S4/Pctrl error: 0/1/2/3/4
• Misc. sensors: 0/1/2/3/4
• Comp. common safety: 0/1/2/3/4
• Comp. VSD safety: 0/1/2/3/4
• Comp. 1 safety: 0/1/2/3/4
• Comp. 2 safety: 0/1/2/3/4
• Comp. 3 safety: 0/1/2/3/4
• Comp. 4 safety: 0/1/2/3/4
• Comp. 5 safety: 0/1/2/3/4
• Comp. 6 safety: 0/1/2/3/4
• Comp. 7 safety: 0/1/2/3/4
• Comp. 8 safety: 0/1/2/3/4
• Pc/S7 sensor error: 0/1/2/3/4
• Blocked air flow: 0/1/2/3/4
• Fan safety: 0/1/2/3/4
• Comp. Low Oil lvl: 0/1/2/3/4
• Comp. High Oil lvl: 0/1/2/3/4
• Oil Separator alarm: 0/1/2/3/4
• Oil Receiver alarm: 0/1/2/3/4
• Oil Recv High press: 0/1/2/3/4
• Oil Recv. Low press: 0/1/2/3/4
• Tw boiling alarm: 0/1/2/3/4
• Hr boiling alarm: 0/1/2/3/4

General Alarm Inputs

Measurements

• AK error: When "ON", the controller is in alarm condition.
• Comp. ctrl. temp °C: Actual temperature for control sensor (Po or S4).
• Comp. ctrl. ref. °C: Actual reference temp. for compressor capacity (incl. external reference signal, if any).
• Compressor cap. %: Cut-in compressor capacity in % (of total capacity).
• Request Compr. Cap %: Reference for compressor capacity (deviations may be due to time delays).
• P0 °C: Suction pressure in °C. (Measured with the pressure transmitter).
• Ss Suction gas °C: Actual suction gas temperature.
• Cond. ctrl. temp °C: Actual temperature for control sensor (Pc or S7).
• Cond. ctrl. ref. °C: Actual reference temp. for condenser capacity (incl. external contributions, if any).
• Cond. cap. %: Cut-in condenser capacity in % (of total capacity).
• Request Cond. cap %: Reference for condenser capacity.
• Pc Bar: Condensing pressure (measured with the pressure transmitter).
• Tc °C: Condensing pressure in °C. (measured with the pressure transmitter).
• Gc status: Actual gas cooler operation: 0=Off, 1=Standby, 2=Max COP operation, 3=Heat recovery, 4=Extra capacity, 5=Manual control.
• Pgc Bar: Actual gas cooler pressure.
• Pgc reference Bar: Actual reference for gas cooler pressure.
• Sd discharge gas °C: Actual discharge gas temperature.
• Sgc °C: Actual temperature at outlet from the gas cooler.
• DI 1 input: Alarm status on the function defined as a DI1 alarm. ON: Alarm is activ, OFF: No alarm, normal situation.
• DI 2.... Input: As above, but for the alarm functions 2 to 6.

Settings

• Main switch: ON: Regulation, OFF: Controller stopped.
• DI 1 Alarm delay m: Time delay for the alarm "DI 1 Alarm".
• DI 2.... Alarm delay m: As above, but for the alarm functions 2 to 6.

Thermostat/Pressostats

Measurements

• AK error: When "ON", the controller is in alarm condition.
• Comp. ctrl. temp °C: Actual temperature for control sensor (Po or S4).
• Comp. ctrl. ref. °C: Actual reference temp. for compressor capacity (incl. external reference signal, if any).
• Compressor cap. %: Cut-in compressor capacity in % (of total capacity).
• Request Comp. Cap %: Reference for compressor capacity (deviations may be due to time delays).
• P0 °C: Suction pressure in °C. (Measured with the pressure transmitter).
• Ss Suction gas °C: Actual suction gas temperature.
• Cond. ctrl. temp °C: Actual temperature for control sensor (Pc or S7).
• Cond. ctrl. ref. °C: Actual reference temp. for condenser capacity (incl. external contributions, if any).
• Cond. cap. %: Cut-in condenser capacity in % (of total capacity).
• Request Cond. cap %: Reference for condenser capacity.
• Pc Bar: Condensing pressure (measured with the pressure transmitter).
• Tc °C: Condensing pressure in °C. (measured with the pressure transmitter).
• Gc status: Actual gas cooler operation: 0=Off, 1=Standby, 2=Max COP operation, 3=Heat recovery, 4=Extra capacity, 5=Manual control.
• Pgc Bar: Actual gas cooler pressure.
• Pgc reference Bar: Actual reference for gas cooler pressure.
• Sd discharge gas °C: Actual discharge gas temperature.
• Sgc °C: Actual temperature at outlet from the gas cooler.
• Thermostat 1 °C: Temperature measurement of function defined in Thermostat 1.
• Thermostat 2 °C: Temperature measurement of function defined in Thermostat 2.
• Thermostat 3 °C: Temperature measurement of function defined in Thermostat 3.
• Pressostat 1 Bar: Pressure measurement of function defined in Pressostat 1.
• Pressostat 2 Bar: As above but for Pressostat 2.
• Pressostat 3 Bar: As above but for Pressostat 3.

Settings

• Main switch: ON: Regulation, OFF: Controller stopped.
• T1 Cutin °C: Cutin value for function defined in "Thermostat 1".
• T1 Cutout °C: Cutout value for function defined in "Thermostat 1".
• T1 High Alarm °C: High alarm limit "Thermostat 1".
• T1 Low Alarm °C: Low alarm limit "Thermostat 1".
• T1 High Al delay m: Time delay for high alarm "Thermostat 1".
• T1 Low Al delay m: Time delay for low alarm "Thermostat 1".
• P1 Cutin press Bar: Cutin value for function defined in "Pressostat 1".
• P1 Cutout press Bar: Cutout value for function defined in "Pressostat 1".
• P1 High Al limit Bar: High alarm limit "Pressostat 1".
• P1 Low Al limit Bar: Low alarm limit "Pressostat 1".
• P1 High Al delay m: Time delay for high alarm "Pressostat 1".
• P1 Low Al delay m: Time delay for low alarm "Pressostat 1".

Voltage and PI Inputs

Measurements

• AK error: When "ON", the controller is in alarm condition.
• Comp. ctrl. temp °C: Actual temperature for control sensor (Po or S4).
• Comp. ctrl. ref. °C: Actual reference temp. for compressor capacity (incl. external reference signal, if any).
• Compressor cap. %: Cut-in compressor capacity in % (of total capacity).
• Request Comp. Cap %: Reference for compressor capacity (deviations may be due to time delays).
• P0 °C: Suction pressure in °C. (Measured with the pressure transmitter).
• Ss Suction gas °C: Actual suction gas temperature.
• Cond. ctrl. temp °C: Actual temperature for control sensor (Pc or S7).
• Cond. ctrl. ref. °C: Actual reference temp. for condenser capacity (incl. external contributions, if any).
• Cond. cap. %: Cut-in condenser capacity in % (of total capacity).
• Request Cond. cap %: Reference for condenser capacity.
• Pc Bar: Condensing pressure (measured with the pressure transmitter).
• Tc °C: Condensing pressure in °C. (measured with the pressure transmitter).
• Gc status: Actual gas cooler operation: 0=Off, 1=Standby, 2=Max COP operation, 3=Heat recovery, 4=Extra capacity, 5=Manual control.
• Pgc Bar: Actual gas cooler pressure.
• Pgc reference Bar: Actual reference for gas cooler pressure.
• Sd discharge gas °C: Actual discharge gas temperature.
• Sgc °C: Actual temperature at outlet from the gas cooler.
• V1 Actual input: Voltage measurement on the function defined in Volt 1.
• V2 Actual input: Voltage measurement on the function defined in Volt 2.
• V3 Actual input: Voltage measurement on the function defined in Volt 3.
• PI1 State: PI function state.
• PI1 Alarm state: PI function alarm condition.
• PI1 Input: Input signal.
• PI1 Reference: Reference.
• PI1 Output value: Output value.
• PI1 Output type: Output type: PWM, Stepper, Voltage.

Settings

• Main switch: ON: Regulation, OFF: Controller stopped.
• V1 Cutin: The value where the relay is to cut in.
• V1 Cutout: The value where the relay is to cut out.
• V1 Cutin delay m: Time delay for cutin of relay.
• V1 Cutout delay m: Time delay for cutout of relay.
• V1 High Al Limit: The value for the high alarm limit.
• V1 Low Al Limit: The value for the low alarm limit.
• V1 High Al delay m: Time delay for high alarm.
• V1 Low Al delay m: Time delay for low alarm.
• PI1 Off Aut Man: Control of PI function. 0: Off, 1: Automatic, 2: Manual.
• PI1 Manual OD: Manual setting of opening degree for PI function.

AKM Menu: "For DANFOSS only"

This menu contains data and setting values for special internal controller functions. Do not change the stated values.