Danfoss ADAP-KOOL AK-PC 572 User Manual

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User Guide

Capacity controller for CO mini pack

AK-PC 572

ADAP-KOOL® Refrigeration Control System

Introduction

Application

The controller is used for capacity regulation of compressors and gas cooler in small CO2 refrigeration applications.

As a minimum, control of a condensing unit can be performed using one compressor unit, one gas cooler and one receiver. A maximum of 3+2 compressors can be regulated. Fx:

Advantages

• Energy savings via:

- Optimal control of CO

- Optimisation of suction pressure

- Night time increase

- Floating gas cooler reference

- Heat recovery

- Load limitation

• Simpliﬁed setting of the functions The controller ensures that the diﬀerent control settings are adjusted in accordance with one another. Only basic settings are required.

• Ongoing adjustment of control references Newly developed algorithms adjust the problematic pressure ratios in the CO2 controller.

Input and output

There are a limited number of available inputs and outputs so most connections are intended for one speciﬁc function. However, there a few options for AUX use:

• If only one or two compressor units are connected to the MT circuit, there will be a DI input available. This could, for example, be used as an alarm input.

• If the compressor used is not a Bitzer CRII, a solid state output can be used for oil management.

• If heat recovery is not used, the AUX3 function can be used for an alarm function.

Operation

The daily operation can be set up directly on the controller or via an external display device. During set-up, the display images will be adjusted so that only the relevant images are opened for additional setting and end-user operation. The operation is password protected, and three levels of access can be granted. The controller contains several languages. Select the preferred language at start-up.

Data communication

The controller has built-in modbus data communication, and it can be connected to an AK-SM 800 type system device.

In order to control the high pressure valve and receiver pressure valve, two valve driver modules, type EXD 316, must be connected.

The overview of connections can be seen on page 22.

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Suction Group

Compressor types

The following types of compressors can be used for regulation:

• Single-step compressors (one can be speed-regulated)

• Bitzer CRII compressor with two unloaders (4-cylinders). MT only.

Capacity regulation

The cut-in capacity is controlled by signals from the connected pressure transmitter and the actual reference. In the absence of any reference there is a neutral zone of up to 5 K. – When the pressure is higher than the “reference + a half neutral

zone”, cut-in of the next compressor (arrow up) is permitted.

– When the pressure is lower than the “reference - a half neutral

zone”, cut-out of a compressor (arrow down) is permitted.

– When the pressure is within the neutral zone, the process

will continue with the currently activated compressors.

This is always controlled using the "Best ﬁt" connection pattern.

The reference

The controller will be set based on a ﬁxed reference point. Based on the conﬁgured reference, the controller will permit an oﬀset of up to +/- 8K depending on the other control parameters. For example

- Night-time increase. Fixed 5 K (on the MT circuit only)

- Po optimisation (on the MT circuit only)

Po ref.

8 K

Load shedding

The function is activated from the system unit. When the load shedding function is activated, the maximum permissible compressor capacity will be limited to 50% of maximum on both MT- and LT circuits. In this way, the total electrical load in the store is limited.

Control parameters

To make it easier to start up the system, we have grouped the control parameters into a number of experience-based values. These values have been combined in a setting called "Easy-settings". Here you can choose between a set of control settings applicable to a slow to rapidly reacting system. The factory setting is medium.

Oil management

If the DO6 output is in use by a CRII, oil management cannot take place. If the output is available, the controller can pulse oil into the MT circuit. The time between the pulses can be conﬁgured using a timer function or using a signal from a level switch.

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Liquid injection in the MT suction line

This function is possible only if there is an available DO output. The function opens for liquid when:

• The suction temperature is too high

• The pressurised gas temperature is too high

• Liquid inlet to the compressor must be prevented.

Gas cooler

Fan control

The fans must be speed controlled by the controller's analog output. EC motors can receive the 0-10 V signal directly.

During night operation, the noise level of the fans can be kept down. This is done by limiting the voltage and thus the speed.

The limitation is bypassed if safety function Sd max. start to function.

De-super heater

This function is possible only if there is an available DO output. This function activates a fan so that the pressurised gas temperature in the LT circuit can be lowered:

• The fan stops when the outdoor temperature is low

• The fan stops when the MT suction gas is too low

Regulation

The controller regulates the pressure in the gas cooler (condenser) so that the system achieves the optimal COP. The controller will always optimise to a subcritical state.

The pressure in the gas cooler is controlled by the valve Vhp. Regulation must have inputs from both a pressure transmitter Pgc and a temperature sensor Sgc. Both must be ﬁtted in the outlet immediately after the gas cooler. The valve is an CCMT valve, which has been specially developed for the pressure conditions that exist in a transcritical CO2 system. The valve's degree of opening can be restricted both at the closing point and in the entire open point.

Maximum COP control

During normal operation without override, the controller will maintain the optimum pressure in the transcritical area.

Reference

It is controlled using variable references. An outdoor temperature sensor, Sc3, must be installed. The sensor must be positioned so that it registers the correct outdoor temperature. In other words, it must be shielded from direct sunlight and located near the airway of the condenser. Under normal operations it will be controlled using a ﬁxed temperature reference of 3 k above the outdoor temperature. The pressure reference will be the conﬁgured value for the subcooling when adjusting in the sub-critical range, and will be adjusted based on optimal COP when adjusting in the trans-critical range.

Important This sensor must be placed immediately at the gas cooler outlet.

The reference value will be user-conﬁgured during heat recovery.

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Heat recovery

A digital input can be received. When the signal is received, the reference for the gas cooler will be raised to the conﬁgured value. When the temperature of the heat recovery has been reached and the DI signal disappears, the reference will drop once again, though it will do so over the course of a few minutes to prevent abrupt changes in the reference.

A potential relay outlet can be connected to heat recovery. The

potential relay is activated when the controller allows for heat recovery.

Cooling will always have a higher priority than heat recovery. If

this higher priority occurs, the potential relay will be deactivated and the reference for heat recovery will be removed from the controller.

The cooling reference is now used for regulation until the tempe-

ratures and pressure allow for heat recovery to resume.

During heat recovery, regulation can be carried out in accordance

with:

• Max. COP - Most energy-optimal.

• Max. HR - The highest achievable temperature.

Pgc ref

Warning

Remember that the controller controls the gas pressure. If the regulation is stopped by the internal or external main switch, this control will stop as well. Risk of loss of charge.

Receiver control

The receiver pressure can be controlled so that it is kept at the desired reference point. This reference point is ﬁxed at 6 bar above the reference point for Po-MT. This control requires the installation of an receiver valve Vrec and a pressure transmitter.

Hot gas dump

This function is possible only if there is an available DO output This function allows for hot gas to be passed to the receiver if the pressure approaches Po-MT. Hot gas will be shut oﬀ again when the pressure returns above the desired level.

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AUX functions and limitations

AUX1-DI and -DO

This function shares an input and output with an MT compressor

AUX1 is possible only if regulating using one or two compressors on the MT. AUX1-DI can then be used as an alarm input. AUX1-DO can then be used for liquid injection, DE-SH or hot gas dumping.

DO6

The output is a solid state output and reserved for a CRII. If not regulating using a CRII, DO6 can be used to control an oil valve.

Oil management.

Oil management will share an output with a CRII compressor. Oil management can take place only if not regulating with a CRII. Oil management can be performed with a timer function or with a level signal from an oil receiver. This signal can only be included in the "OIL" input. If the input is not used for OIL it will be available and called AUX2-DI. It can then be used as an alarm input.

AUX2-DO

The potential relay output can be freely used for liquid injection, DE-SH or hot gas dumping.

Survey

Connection "572"

1. priority

MT3 x x

CRII x

Heat recovery x (x)

2. priority

Oil No

CRII

Fan error Max. 1 x x x

Alarm text Max. 1 x x x

Liquid injection

DE superheat x x x

Hotgas dump x x x

DI3

"572"

DO3

x x x

HP DIHP DORec DIRec

DO6

x (x)

AUX3-DI

This function shares an input with the heat recovery function. AUX3-DI is possible only if heat recovery is not used. AUX3-DI can then be used as an alarm input.

AUX3-DO

This function is reserved for heat recovery but only if a potential relay output is also required to be activated when heat recovery is regulated. If the output is not used for heat recovery, it can be used for liquid injection, DE-SH or hot gas dumping.

AUX_-DI as an alarm input

There are two alarm options:

• A "Fan error" that will be shown in the display and in the system unit if it occurs.

• A text alarm that will be shown in the display and in the system unit if it occurs.

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Safety functions

Control optimisation

The controller continually registers the diﬀerent pressures in the system. The pressures are automatically adjusted for the most energyoptimal pressure. If the pressure approaches a threshold value, the controller will adjust the diﬀerent references to maintain control.

Min./max. suction pressure Po

The suction pressure is recorded continuously. If the measured value falls below the set minimum limit, the compressors will immediately cut out. If it exceeds the max. value, an alarm will be generated once the time delay has elapsed.

LP switch

On/oﬀ signal on a DI input If a signal is received, all compressors will immediately be stopped.

HP switch

On/oﬀ signal on a DI input If a signal is received, all compressors will immediately be stopped. Fan capacity will increase depending on how much the Pgc measurement exceeds the reference.

Sensor failure

If lack of signal from one of the connected temperature sensors or pressure transmitters is registered an alarm will be given.

• In the event of a Po error, regulation will continue with a set capacity in daytime operation (e.g. 50%), and a set capacity in night operation (e.g. 25%), but with a minimum of one step.

• In the event of a Pgc error, the fan capacity that corresponds to how much compressor capacity is connected will cut in. Compressor regulation will remain normal.

• When there is an error on the Sd sensor the safety monitoring of the discharge gas temperature will be discontinued.

• When there is an error on the Ss sensor the monitoring of the superheat on the suction line will be discontinued.

• In the event of an error on the outdoor temperature sensor, Sc3, 35°C will be used as a reference.

NB: A faulty sensor must be OK within 10 minutes before a sensor

alarm is cancelled.

A sensor alarm can be reset manually by pushing the "X-button" for 2 seconds when the alarm is shown in the display "Active alarms".

Fan error alarm

On/oﬀ signal on a DI input. Possible only if the input is not used for its intended purpose. If the signal is received, an alarm is given.

Min./max superheating via Ss and Po measurement

Temperature sensor on an AI input. If superheating is higher or lower than the set limits, an alarm will be generated once the time delay has elapsed.

Max. discharge gas temperature Sd

Temperature sensor on an AI input. There is an Sd for the MT group and an Sd for the LT group. If the temperature nears the set max. temperature, the capacity of the compressor will be reduced

The compressors will be stopped if the temperature nears the set max. temperature value.

Liquid injection in the MT suction line

This function is conﬁgured in the AUX_DO output. There are no conﬁguration values. The controller determines when liquid injection is required.

General DI alarm

On/oﬀ signal on a DI input. Possible only if the input is not used for its intended purpose. The controller contains one general alarm input, to which alarm text and delay times can be connected. Alarm and text will appear when the delay time has elapsed.

Info

In normal operating conditions, the temperature at Sd will be between 60 and 70°C - depending on whether it is winter or summer. If the "Heat reclaim" function is to raise the condensing pressure, the temperature may increase to 90° or higher.

The Sc3 sensor should be positioned so that it measures the air intake temperature for the gas cooler. If it measures a temperature that is too high, the system's COP will become impaired.

The Sgc signal must be stable. If this cannot be done using a surface sensor, it may be necessary to use an immersion tube sensor.

If the power supply to AK-PC 572 or the high pressure valve Vhp fails, the system cannot be controlled. We recommend installing an emergency supply (UPS) for both the controller and the valve to avoid faults. A relay in the UPS should be incorporated into the controllers safety circuit so that it can restart safely.

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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.

Click on the "Right Arrow" to view e.g. the following images:

Booster + HP

MT + HP

When an alarm is sent from the controller, you must advance to this display to see the alarm text. Then click on the alarm text to view the details relating to the alarm.

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Set-up overview

There are 2 ways in which the controller can be set up. Select the one that is easiest for you: either “Wizard” or a review of “all parameters”.

Start screen upon delivery

Operating principles

1. Select position using arrow keys

2. Select using “Enter” 

3. Use the “X” to return

Hold “Enter”  down for 2 seconds to come to password entry

Select a set-up method. End by pressing “Enter” 

The default password upon delivery is 300. Use the arrow keys to set the password. End by pressing “Enter” 

Language

Choose from one of the possible languages

Wizard

Here you will be led through a series of settings, after which the controller will be ready for start. Image 1 of 27 is displayed here.

Parameter settings

Here is the start image for the possible settings.

Main Menu

The ﬁrst setting is the Plant type

The following options are available here:

• Booster + HP

• MT + LT

When the Plant type has been selected, it will allow several settings to be made. For example:

Continue to the next menus. All settings are explained on the pages that follow.

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Start/stop

Plant type

Suction MT

Main switch

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. When all settings have been made and the main switch is set to “ON”, the controller will enable the display of the various measurements. Regulation will start. (One external main switch must be “ON” before regulating starts.)

Extern Main swich

Status on External main switch

It is possible to connect an external switch which can be used to start and stop regulating. Both the internal and external main switch must be ON before regulating starts.

If the external cutout is omitted, the dedicated input must be shorted.

Select Plant type Plant settings:

The following must be regulated:

• Booster + HP

• MT + HP

Mains frequency Frequency

Set the net frequency

Control status MT Regulation status

Control status Read the status of the functions in the control circuit here

Reference The total regulation reference can be read here

ToMT temperature The measured PoMT pressure converted to temperature can be read here

PoMT Pressure The measured pressure for the PoMT pressure transmitter can be read here

Requested capacity Here the preferred connected capacity can be read as a % of total capacity

Running capacity Here the connected capacity can be read as a % of total capacity

No. of running comp. The number of compressors in operation can be read here

MC PoMT oﬀset The size of a reference displacement on PoMT required from the system unit

(suction pressure optimisation function) can be read here

SdMT discharge

The measured discharge temperature can be read here

temp.

SsMT Suction gas

The measured suction gas temperature can be read here

temp.

Superheat MT The actual superheat can be read here

Day / Night status The status of the day/night function can be read here

Load shed The status of the load shed function can be read here

HP Safety switch The status of the security circuit can be read here

Injection ON MT The status of the injection ON signal sent to the evaporator controllers can be read here

Liq. inj. suction line

The status of hte liquid injection in the suction line can be read here

MC Load Shedding The status of the load shed signal received from the system device can be read here

MC Night Setback The status of the night increase signal received from the system device can be read here

Control settings Regulation settings

Control mode Regulation type

The regulation is normally set to “Auto”, but it can be changed to “Oﬀ” or “Manual”.

Manual capacity When setting to “Manual”, a forced capacity setting can subsequently be entered in %.

Setpoint Enter the set point for the regulation (regulation reference = set point + diﬀerent oﬀsets) here

An oﬀset can originate from a night increase signal or from an override function on the system device.

PI control selection Set how quickly the PI regulation must react here: 1 = slowly, 10 = very quickly.

SW: 1.0x

On / Oﬀ

Fac: None

50 Hz / 60 Hz Fac: 50 Hz

MAN / OFF / AUTO Fac: AUTO

Min: 0 % Max: 100%

Min: -55°C Max: 20°C Fab: -10°C

Min: 1 Max: 10 Fab: 5

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Pump down

Pump down function To avoid too many compressor starts/stops with low load, it is possible to deﬁne a pump down function in which the compressors are stopped when the suction pressure falls to "Pump down limit Po". This limit has been set at 6 K below the reference point for Po.

Injection OFF delay Delay of the forced closing of expansion valves, if the controller calls for cut in of compres-

sors, but the compressors are in a locked situation and therefore cannot start.

Conﬁguration

Compressor mode Set the type of compressor to be used for regulation:

• Multi + Single:***) First compressor has unloaders. The remaining ones are one-step units

• CRII4+Single **

)

First compressor is CRII4 compressor. The remaining ones are

one-step units

(In the event that CRII is selected it will not be possible to select oil management)

• Single-step only: All are one-step compressors

• None:

No. of compressors Set the number of compressors on the suction circuit MT

This is a total amount.

If regulating with two compressors only, DI3 and DO3 can be used for the AUX1 function.

Lead comp. 1 size Set the nominal compressor capacity for the ﬁrst compressor (it is deﬁned under

“Compressor mode”)

Comp. 2 size Set the nominal compressor capacity for compressor 2

Comp. 3 size Set the nominal compressor capacity for compressor 3

VSD Min. speed ***: For speed

Min. speed at which the compressor will cut out

VSD Start speed

***: For speed Minimum speed at which the compressor will start (must be set to a higher value than “VSD Min. speed”)

VSD Max speed

***: For speed Highest permitted speed for compressor

CRII Period time **: For CRII

Set the period time for the unloader valve (on time + oﬀ time)

Comp1 min Cap **: For CRII

Conﬁgure the minimum capacity at which the compressor will stop

Comp1 start Cap **: For CRII

Conﬁgure the capacity at which the compressor will stop

Compressor timers Compressor timers

Lead comp.1 Restart Min. period of time for re-starting the ﬁrst compressor.

Set the forced on+Oﬀ-time before it can be switched on again. The setting is to prevent incorrect operation. To prevent a compressor breakdown, the setting must be made in accordance with the requirements of the compressor supplier.

Comp. Restart Min. period of time for restarting remaining compressors

Set the forced On+Oﬀ-time before it can be switched on again. The setting is to prevent incorrect operation.

Yes /No Fac: No

Min: 0 s Max: 300 s Fac: 120 s

DO-demand

Fac: Speed+single

DI + DO-demand

Min: 1 Max: 3 Fac: 3

Min: 1 m3h Max: 20 m3h Fac: 1 m3h

Min: 10 Hz Max: 60 Hz Fac: 30 Hz

Min: 20 Hz Max: 60 Hz Fac: 45 Hz

Min: 40 Hz Max: 120 Hz Fac: 60 Hz

Min: 10 s Max: 60 s Fac: 20 s

Min: 10 % Max: 50 % Fac: 10 %

Min: 10 % Max: 100 % Fac: 30 %

Min: 1 min. Max: 60 min Fac: 5 min

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Suction LT

Gas cooler

Compressor status Compressor status

Comp. 1 status Read the operating status for compressor 1 here. The following information may appear:

Alarm - Alarm situation Main Sw. oﬀ - Compressor is stopped Manual ctrl. - Compressor is cut out on safety input (DI safety input) High Sd temp. - Stopped due to high Sd temperature Ready - Compressor is ready to start OFF timer - Compressor is waiting for Min OFF timer to expire Min. ON timer - Compressor is waiting for Min ON timer to expire Running - Compressor is running Disabled - Compressor has been taken out of operation (compressor service)

Comp. 2.... The same function for the remaining compressors

Compressor capacity Compressor capacity

Comp. 1 cap. Read the connected capacity of the compressor (0-100%) here

Comp. 2...... The same function for the remaining compressors

Compressor runhours Compressor run hours

Reset runtime/cycles Reset all of the hour counters and start counters for the subsequent compressors here.

Comp.1 Runtime L Read the total operating time of the compressor (in hours) here

Comp.2..... The same function for the remaining compressors

Compressor cycles Compressor cycles

Comp.1 Cycle total Read the number of times the compressor has been started here

Komp.2..... The same function for the remaining compressors

Compressor service Compressor service

Comp.1 out of service The compressor can be taken out of operation, so that the controller regulates without this

compressor. No = Normal regulation Yes = Regulating is carried out without this compressor, and no alarms are generated by it.

Comp.2..... The same function for the remaining compressors

Suction group LT . Please see descriptions under suction group MT. (In suction group LT it is not possible to use: Bitzer CRII, Po optimisation and night-time reduction).

Control status Regulation status

Control status Here you can read the status of the condenser circuit, e.g.:

• Main Sw. oﬀ - Main switch = OFF

• Normal - Controller working as expected

• Emergency – Emergency Controls

• Manual ctrl - Capacity control is set in manual control mode

Pgc The current value of the regulation sensor can be read here

Sgc The current value of the regulation sensor can be read here

Pgc Reference The total regulation reference can be read here

Sgc Reference The total regulation reference can be read here

Vhp OD Here you can see the opening degree of the Vhp valve

Fan running capacity

Fan requested

Here the connected capacity can be read as a % of total capacity

Here the preferred connected capacity can be read as a % of total capacity

capacity

Sc3 air on cond. The measured outdoor temperature with sensor Sc3 can be read here

Heat recovery status Here the status of the heat recovery function can be read

HP safety switch The status of the HP safety switch can be read here

Day / night status Here you can see whether the controller is in Day or Night mode

Control settings Control settings

Vhp control mode Regulation type

The regulation is normally set to “Auto”, but it can be changed to “Manual”.

Vhp manual capacity When setting to “Manual”, capacity can then be forced set in %.

Yes /No Fac: No

MAN / AUTO Fac: AUTO

Min: 0 % Max: 100%

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Vhp Easy PI

Set how quickly the PI regulation must react here: 1 = slowly, 10 = very quickly. (For setting 0 "User def." the special settings options will open. Kp, Tn. These options are only for trained staﬀ.)

Vhp Kp Ampliﬁcation factor for PI regulation (can be viewed and conﬁgured only when the previous

menu has been set to "0"). If the Kp value is lowered, regulation runs more smoothly

Vhp Tn Integration time for PI regulation (see above)

If the Tn value is increased, regulation will run more smoothly

Vhp min OD Limitation of the valve's degree of closing

Averange OD Readout of the average opening degree of the valve

Fan control mode Regulation type

The regulation is normally set to “Auto”, but it can be changed to “Manual”.

Min: 0 (User def.) Max: 10 Fac: 5

Min: 0,5 Max: 10 Fac: 2,0

Min: 30 Max: 300 Fac: 75

Min: 0% Max: 15% Fac: 0%

Min: 0% Max: 100% Fac: 35%

MAN / OFF / AUTO Fac: AUTO

Fan manual capacity When setting to “Manual”, capacity can then be forced set in %.

Fan Easy PI

Fan Kp Ampliﬁcation factor for PI regulation (can be viewed and conﬁgured only when the previous

menu has been set to "0")

If the Kp value is lowered, regulation runs more smoothly

Fan Tn Integration time for PI regulation (can be viewed and conﬁgured only when the previous

menu has been set to "0")

If the Tn value is increased, regulation will run more smoothly

dt subcool

Here you can set the desired sub-cooling

Heat recovery Deﬁne whether a heat recovery cycle should be started with a signal on a DI input here.

• No: No function

• DI only: A DI input is reserved. When a signal is registered, the heat recovery function refer-

ence will become active.

• DI and DO: Choose this setting if you are also activating a potential relay output (HR on the receiver module).

Heat reclaim mode Here you conﬁgure the controller for when a signal is received for heat recovery.

You can choose between raising the temperature to achieve maximum heat recovery or maintain temperature at the level with the highest eﬃciency.

Heat recovery SP Here you can set the reference that the controller will switch to when heat recovery is desi-

red.

Fan conﬁguration Conﬁguration of fans

EC Start

Here you can conﬁgure the controller capacity at which the fans will start. (With a setting of 5% the fans will start when the desired controller capacity exceeds 5% of the EC Min. setting)

EC Min.

Here you conﬁgure the lowest permitted speed for the fans in % (% of output signal)

If lower capacity is required, this minimum speed should be maintained all the way down to 0% capacity. At 0% capacity, the system stops completely.

EC Max.

Here you conﬁgure the fan speed in % when regulating at 100% capacity. (Typically 80% of the output signal).

EC abs max Sgc

Here you conﬁgure the Sgc temperature at which the fan speed is raised to the absolute maximum (100% of the output signal)

Fan status Fan status

Fan speed Here a reading of the desired condenser fan capacity is provided in %

EC start/stop Fan operation status can be read here

Reset runtime cycl.

EC Runtime total

EC Cycl. total

Here the two counters "run time" and "couplings" can be reset

Here you can see how many hours the fans have been operational for since the last reset

Here you can see how many fan starts there have been since the last reset

Min: 0 % Max: 100%

Min: 0 (User def.) Max: 10 Fac: 5

Min: 0,5 Max: 50 Fac: 10

Min: 10 s Max: 900 s Fac: 180 s

Min: 1,0 K Max: 30,0 K Fac: 4,0 K

Fac: No

High eﬀect / Max. recovery Fac: High eﬀect

Min: 70 bar Max: 100 bar Fac: 80 bar

Min: 0% Max: 20% Fac: 5%

Min: 0% Max: 30% Fac: 20%

Min: 30% Max: 100% Fac: 80%

Min: 20°C Max: 60°C Fac: 60°C

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Receiver

Rec. control status

Control status Here you can see the status of the receiver controller:

Prec Oﬀ / Idle / Emergency / Normal / Hot gas dump

Prec reference Here you can see the receiver pressure

Vrec OD Here you can see the reference point for the receiver pressure

Hot gas dump Here you can see the opening degree of the valve Vrec in %

Rec. control settings

Control mode

Vrec manual capacity

Prec max. Here the maximum receiver pressure can be conﬁgured

Easy PI select

Manual hot gas Here you can override the hot gas valve.

Oil Control

Control type Adjust whether oil management will be used.

Oil control status Here you can see the oil management status:

Oil cycle time Adjust the period between pulses. (Only if regulated with the "Timer only" setting)

Oil pulse duration Adjust the valve opening time for each pulse

Safety monitoring

PoMT Min. limit Safety limits for min. PoMT

PoMT Max. alarm Alarm limit for high PoMT

Superheat Min. MT Alarm limit for insuﬃcient superheating

Superheat Max. MT Alarm limit for excess superheating

Receiver status

Here you can see the status of the valve for hot gas dumping

Controller type The controller is normally set to "Auto" but can be changed to "Manual".

When setting to "Manual", capacity can then be forced set in %.

The reinforcement factor for the PI controller (can only be viewed and conﬁgured when the previous menu has been set to "0") If the Kp value is lowered, regulation runs more smoothly

Integration time for PI regulation (see above) If the Tn value is increased, regulation will run more smoothly

(Only if hot gas dump is deﬁned in the AUX section)

Limitation It is only possible to use oil management if the solid state outputs (DO5 and DO6) are free. If regulating using compressor type Bitzer CRII, the two outputs will be used by the compressor and oil management cannot be performed.

You can choose whether pulse controls run only with a timer function or whether pulse controls are performed only when there is a signal from a level switch

None / Main switch oﬀ / Idle / Valve open / Delay before next pulse

If a low value is registered, all compressors will cut out

If a high value is registered, an alarm will be generated

If a higher value is registered during a load limitation, the load limitation will be cancelled until Po has returned to the reference.

(Superheating is measured in the suction line by PoMT and SsMT.)

MAN / AUTO Fac: AUTO

Min: 0 % Max: 100%

Min: 34 bar Max: 89 bar Fac: 59 bar

Min: 0 (User def.) Max: 10 Fac: 5

Min: 0,5 Max: 10 Fac: 2,0

Min: 30 Max: 300 Fac: 75

Auto Man on Man oﬀ

DO-demand

Non / Timer only / Niveau Fac: Non

Min: 180 s Max: 1800 s Fac: 300 s

Min: 1 s Max: 30 s Fac: 5 s

Min: -55°C Max: 30°C Fac: -40°C

Min: -30°C Max: 30°C Fac: 5°C

Min: 0 K Max: 20 K Fac: 4 K

Min: 20 K Max: 80 K Fac: 50 K

14 User Guide RS8KH202 © Danfoss 2019-03 AK-PC 572

SdMT Max. limit Safety limit for max. SdMT

PoLT Min. limit Same settings as for the MT group

PoLT Max. alarm

PoLT Max. delay

Superheat Min. LT

Superheat Max. LT

SdLT Max. limit

Pgc Max. Safety limit for max. Pgc

Safety restart time Delayed start-up following safety cut-out

Sensor alarm reset Reset alarm after sensor error

Aux. functions

Digital input

Digital output

DI AUX1

DI AUX2

DI AUX3

DI alam delay

DI alarm text

DO AUX1

DO AUX2

DO AUX3

At 10 K under the set value, the compressor capacity will be reduced, and the entire condenser capacity will cut in. If the threshold is exceeded, the entire compressor capacity will cut out.

If Pgc exceeds the value set here minus 3 K, the entire fan capacity will cut in, and compressor capacity will be reduced by 1/3 for every 30 seconds. If Pgc exceeds the threshold value, the entire compressor capacity will immediately cut out, and an alarm will be generated when the delay time expires.

If a safety cut-out has occurred due to “Sd max. limit”, “Pgc max. limit” or “Po min. limit”, the compressors must be kept stopped for a deﬁned period of time. The amount of time can be set here.

When a sensor error has occurred, an O.K. signal must be registered within a speciﬁed number of minutes before the controller resets the alarm. The regulation will be resumed as soon as the sensor signal is O.K.

If there are only two compressors in the MT circuit, the DI3 output will be available for AUX1. The input can then be used for an optional function. You can choose between the functions "Fan error" or "Alarm"

If level signals are not desired for oil management, the "DI on the high pressure module" input will be available. The input can then be used for an optional function. You can choose between the functions "Fan error" or "Alarm"

If an "HR req" signal is not desired for use in heat recovery, the "DI on the receiver module" input will be available. The input can then be used for an optional function. You can choose between the functions "Fan error" or "Alarm"

Delay time for a DI alarm

Here you can choose what text to display in the event of a DI alarm. The text can be seen in the display and can also be sent to a system unit. Choose between the following texts: General Alarm, Low Pressure, High Pressure, High Temperature, Low Temperature, Oil Level, Oil Temperature, Liquid Level, Leak Detection, Inverter Fault, Dry Cooler, Pump, Motor Protection Comp, Brine Pressure. Note: There is only one alarm available. The signal will be received in one of the three AUX inputs

If there are three compressors in the MT circuit, the potential relay output DO3 will be used by MT3. If there are only two compressors in the MT circuit, the potential relay can be used by one of the following functions: Liquid injection, DE-SH or hot gas dumping

Relay output in the high pressure module You can choose between the following functions: Liquid injection, DE-SH or hot gas dumping

Relay output in the receiver module You can choose between the following functions: Liquid injection, DE-SH or hot gas dumping

Min: 60°C Max: 160°C Fac: 140°C

Min: -1 bar Max: 159 bar Fac: 40 bar

Min: 0 min. Max: 60 min. Fac: 2 min.

Min: 1 min. Max: 30 min. Fac: 10 min.

D/-demand

DI-demand

Min: 0 min. Max: 360 min. Fac: 0 min.

DO-demand

AK-PC 572 User Guide RS8KH202 © Danfoss 2019-03 15

System

Display Select views on the display

Language Choose from the following languages:

Pressure units Pressure unit

Temperature units Temperature unit

Time format Time format

Screen saver time Screen saver time

User logout time Log-oﬀ time

Display contrast Adjust contrast

Password Access code

Password level 1

Password level 2

Password level 3

Real time clock Date and time

Network Network

Modbus Address Set the address of the controller here if it is connected to a system device via data communi-

Baudrate The system unit usually communicates with 38.4.

Serial mode The value must not be changed EXD reset node id Here the EXD module addresses can be reset so that the main module can assign the correct

Reset to factory Return to factory settings

I/O Conﬁguration

Most connections have been given in advance and cannot be changed. See the connection diagram.

English, German, French, Danish, Spanish, Italian, Portuguese, Dutch, Russian, Polish, Czech, Turkish, Hungarian, Croatian, Serbian, Romanian

Select bar or PSIG

Select °C or °F.

Choose 12-hour or 24-hour format.

If no buttons have been pushed for a speciﬁc period of time, the light in the display will be minimised. The light level will be restored upon renewed activity.

If buttons have not been pressed within a speciﬁed period of time, the screen will return to the overview display. Afterwards, the user will have to log on again. If the time is changed, the new time will apply the next time the user logs in. If you log out here without waiting for the time-out period to elapse, go to the overview display and hold down the “X” button for 3 seconds.

The settings in the controller can be protected with three levels of access codes. Level 1: End user settings, such as changing the weekly plan Level 2: Adjusting installer level Level 3: Conﬁguration of system settings (conﬁguration menu) The access code is a number between 001 and 999.

Used by weekly plan and alarm function.

cation.

If it is changed in the system unit to for example, "SLV" mode (19.2), setting must also be changed to 19.2 here in the controller.

addresses. The procedure is described on page 21.

If this function is set to “YES”, all settings will be returned to factory default settings, and the alarm list will be cleared.

Fac: UK English

Bar / PSIG Fac: bar

°C / °F Fac: °C

12 / 24 Fac: 24 h

Min: 1 min. Max: 60 min. Fac: 1 min.

Min: 1 min. Max: 60 min. Fac: 2 min.

Min: 0 Max: 100 Fac: 30

Fac: 100

Fac: 200

Fac: 300

Year, month, date Hours, minutes

Min: 0 1 Max: 120 Fac: 1

Fac: 384

Fac: 8E1

For digital outputs, deﬁne whether the function will be active for an activated or deactivated relay. For digital inputs, deﬁne whether the function/alarm will be active for an interrupted or shut-oﬀ switch. For analogue outputs, deﬁne whether the output signal should be 0-5 V or 0-10 V For analogue inputs, deﬁne:

Temperature sensors: Normally, the sensor type is a Pt1000 model.Calibration value (+/- 10°C) Pressure sensors:: Signal type: 4-20mA, 1-5V or 10-90% ratiometric of 5 V supply voltage. Minimum and maximum pressure range Calibration value (+/- 5.0 bar) Please note: If a function has been connected to an input or output and is subsequently deselected in the conﬁguration, the function in question will be marked with an exclamation mark (!). In this case, you must either activate the function in the conﬁguration, or deselect the function on the input or output in question.

16 User Guide RS8KH202 © Danfoss 2019-03 AK-PC 572

I/O Status

Digital output On/oﬀ outputs

Most outputs have been locked to a function. These are as follows: 1: MT compressor 1 2: MT compressor 2 3: MT compressor 3. If no MT3 compressor is connected, the output must be conﬁgured for

'None'. The output can then be used for an AUX1 function. The function can be conﬁgured in

the AUX menu. 4: External alarm unit 5: Solid state output. Reserved for a Bitzer CRII. 6: Solid state output. Reserved for a Bitzer CRII. If a Bitzer CRII is not connected, the output can

be used to manage an oil valve. 7: LT compressor 1 8: LT compressor 2 When the compressor is idle, there will be no voltage to the bypass valves. Voltage is connected immediately before the compressor is started.

Digital input On/oﬀ inputs

Most inputs are locked to a function. These are as follows: 1: Signal from compressor 1 in the MT circuit. Once a signal is received, the compressor will cut out. When monitoring an Sd temperature in a Bitzer CRII, the temperature signal must be registered by an external thermostat that will then issue an on/oﬀ signal via the input. 2: Signal from compressor 2 in the MT circuit. Once a signal is received, the compressor will cut out. 3: Signal from compressor 3 in the MT circuit. Once a signal is received, the compressor will cut

out. If not regulating with an MT3 compressor, the input can be used for an AUX1 function. 4: Signal from external main switch. Regulation starts when a signal is received. 5: Signal from the high pressure switch in the MT circuit. Once a signal is received, the circuit will cut out. 6: Signal from the high pressure switch in the LT circuit. Once a signal is received, the circuit will cut out. 7: Signal from compressor 1 in the LT circuit. Once a signal is received, the compressor will cut out. 8: Signal from compressor 2 in the LT circuit. Once a signal is received, the compressor will cut out. The signal must be deﬁned for each input. Should the function take eﬀect when the input is Oﬀ or when it is On

Analog output 0-10 V outputs

The outputs have been locked to the following functions: 1: Signal to the fans on the gas cooler 2: Not used 3: Signal for the speed controls in compressor 1 in the MT circuit 4: Signal for the speed controls in compressor 1 in the LT circuit

Analog input Analogue inputs

The outputs have been locked to the following functions: 1: Pressure transmitter PoMT 2: Pressure transmitter PoLT 3: Pressure transmitter Pgc 4: Pressure transmitter Prec 5: Temperature sensor SsMT 6: Temperature sensor SdMT 7: Temperature sensor Sgc 8: Temperature sensor Sc3

Stepper outputs

Here you can set the valve type.

Choose between the following types: CCM10...40, CCMT2....42, CTR20, ETS6...400.

Choose user-deﬁned if there is a diﬀerent type of valve. All valve data must then be conﬁgured directly in the valve module. The control unit MMIMYK can be used.

Digital output

Status of on/oﬀ outputs

Here you can see if the function is on or oﬀ.

. 8:

Digital input

Status of on/oﬀ inputs

Here you can see the status of the function/alarm.

. 8:

Analog output

Status of analogue outputs

Here you can see the size of the output signals as a % of max. signal.

3: 4:

On Oﬀ

Pressure signal:

Ratiometric

Temperature signal:

Pt 1000 ohm

Fac: CCMT-2

AK-PC 572 User Guide RS8KH202 © Danfoss 2019-03 17

Analog input

1: . 8:

Expansion module

Vhp OD Vrec OD Ss-LT Sd-LT Oil / Aux 2 DI HR / Aux3 DI Aux 2 DO HR / Aux 3 DO HP SW version Rec. SW version

I/O Manual Control

Digital output Manual control of a relay output

Analog output Manual control of analogue output

Expansion modules

Alarm priorities

General

Standby mode: Sensor error: Output in MANUAL:

Suction group MT

Low pressure: High pressure: Superheat High Sd temperature Compressor safety:

Suction group LT

Low pressure: High pressure: Superheat High Sd temperature Compressor safety:

Fan safety: HP control:

Status of analogue inputs

Here you can see pressure and temperature values received by the controller. The values include calibration

Status of the EXD modules

Here you can see the actual opening degree of the valves, the temperatures in the LT circuit and status of the inputs and outputs.

Under normal regulation, the function of the relay will be in “Auto”. In the event of an override, the function will be switched to either “On” or “Oﬀ”. Remember to switch to “Auto” when the override is to be completed.

During normal regulation, the function of the output will be “Auto”. In the event of an override, the function must ﬁrst be changed to “Manual”, after which the output signal can be changed from 0-100%. Remember to switch to “Auto” when the override is to be completed.

Manual control of a connection in the HP module and receiver module

During normal regulation, the function of the output will be "Auto". In the event of an override, the function must ﬁrst be changed to "Manual". The function can then be set to the desired value. Remember to switch to "Auto" when the override is to be completed.

Alarm priorities

The controller will issue an alarm notiﬁcation if a speciﬁc incident occurs. Each incident is set to indicate the importance of each alarm, but it is possible to modify the importance of each. Choose from between the following priority levels:

Critical: Important alarms that require a high level of attention. Severe: Alarms of intermediate importance Normal: No important alarms Disable: Alarms set to this priority level will be cancelled.

Factory setting for the alarm can be seen on page 19.

Auto / On / Oﬀ

Auto / Man

0-100%

Critical Servere Normal Disable

Alarm list

Alarm text Reason Priority

General alarms

Standby mode (Main sw. OFF) Alarm when control is stopped by internal or external Main Switch (DI input "Main Switch") Standby mode Normal

PoMT sensor error Pressure transmitter signal from PoMT defective

PoLT sensor error Pressure transmitter signal from PoLT defective

SsMT sensor error Temperature signal from SsMT suction gas temp. defective

SsLT sensor error Temperature signal from SsLT suction gas temp. defective

SdMT sensor error Temperature signal from SdMT discharge gas temp. Sd defective

SdLT sensor error Temperature signal from SdLT discharge gas temp. Sd defective

Pgc sensor error Pressure transmitter signal from Pgc defective

Prec sensor error Pressure transmitter signal from Prec defective

Sgc sensor error Temperature signal from Sgc defective

Sc3 sensor error Temperature signal from Sc3 defective

Output in manual mode An output is set in manual mode Output in MAN mode Normal

Suction MT alarms

PoMT Low suction pressure Minimum safety limit for suction pressure PoMT has been violated

LP safety switch cut out MT Low safety limit for external low pressure switch has been violated (DI input "LP switch MT")

PoMT High suction pressure High alarm limit for PoMT has been exceeded High pressure PoMT Critical

SsMT High superheat Superheat in suction line MT too high (measured by PoMT and SsMT)

SsMT Low superheat Superheat in suction line MT too low (measured by PoMT and SsMT)

SdMT High discharge temp. Safety prevention limit for SdMT discharge temperature has been exceeded (10K below safety limit) High disch. temp.SdMT Critical

Comp. 1MT High disch. temp Safety limit for discharge gas temperature has been exceeded

Comp 1-3MT safety cut out Compressor no. 1-3 MT has been cut out on general safety input (DI1, DI2, DI3)

Suction LT alarms

PoLT Low suction pressure Minimum sikkerhed grænse for sugetryk PoLT er blevet koblet ud Low pressure Po LT

LP safety switch cut out LT Low safety limit for external low pressure switch has been violated (DI input "LP switch LT")

PoLT High suction pressure High alarm limit for PoLT has been exceeded High pressure Po LT Critical

SsLT High superheat Superheat in suction line LT too high (measured by PoLT and SsLT)

SsLT Low superheat Superheat in suction line LT too low (measured by PoLT and SsLT)

SdLT High discharge temp. Safety prevention limit for SdLT discharge temperature has been exceeded (10K below safety limit) High disch. temp. S dLT Critical

Comp. 1LT High disch. temp Safety limit for discharge gas temperature has been exceeded

Comp 1-2LT safety cut out Compressor no. 1-2 LT has been cut out on general safety input (DI7, DI8)

Gas cooler alarms

Prec high alarm limit Alarm from the receiver High receiver pressure

High gas cooler pressure Pgc registrer a too high pressure High pressure Pc Critical

Common fan alarm A fan is reported as defective via the shared safety input (DI input "Fan Alarm") Fan Alarm Normal

Display alarm

EER31 See next page

setting

Sensor error Normal

Low pressure PoMT Normal

Superheat MT Normal

Compressor safety cutout MT

Superheat LT Normal

Compressor safety cutout LT

Default

Normal

value

Sensor alarms Sensor alarms shut oﬀ automatically when the sensor has been O.K. for 10 minutes. If you have corrected the sensor error and want to perform a manual, forced removal of the alarm, go to the “Alarm detail display” Press and hold the “X” key for 2 seconds here.

ERR31 Alarm on the external display - MMIGRS2

If the communication to the display is not carried out correctly, it will send an “ERR31” error notiﬁcation. This may be caused by the displayed terminations not being installed, or that there have been interruptions in data communication during the time when the display retrieves the basic information from the controller. Once the terminations have been inspected, you should then check the software version of the external display. This is done by holding down the Enter key and the X key for 5 seconds, until the Bios menu appears. Next, press the X key and read oﬀ the software version in the bottom right corner. The software version must be 1.13 or newer.

Once the display’s software version has been checked, check the display’s settings as follows:

1. Hold the Enter key and the X key down for 5 seconds, until the Bios menu appears.

2. Select the “MCX selection” menu

- Select the “Clear UI” line and press Enter

- Select the “Autodetect” line and press Enter

3. Press the X key to return to the Bios menu

4. Select the “COM selection” menu

- Select the “CAN” line and press Enter

5. Press the X key to return to the Bios menu

6. Select the “Start up mode” menu

- Select the “Remote application” line and press Enter

7. Press the X key to return to the Bios menu

8. Select the “CAN” menu

- Select the “Baudrate” line and check that it is 50K

- Select the “Node ID” line and check that it is 126

9. Press the X key to return to the Bios menu

10. Select the “Application” menu and press Enter.

The display will once again retrieve data from the controller. This process will take about 5 minutes.

Addresses of the valve modules

Important

Read the following before you connect the controller and the two valve modules to the supply voltage.

Both valve modules are factory set with the same address. In order to give each module the correct address, you must follow this procedure:

1. On the two valve modules, remove the terminals with power supply. (The power supply is connected later, but in the correct order).

2. Connect the controller to the power supply

3. Check that the main switch is OFF

4. HP module: Mount the terminal with power supply

5. Wait 5 seconds

6. Receiver module: Mount the terminal with power supply. Wait 5 seconds

All modules now have power supply and the two modules each have their own address: 96 for the HP module 97 for the receiver module. The addresses will only be used internally between the three modules.

If anything has gone wrong, the two valve modules will have activated the function "EXD reset node ID" and the procedure must be repeated.

Resetting incorrect addresses in the valve modules:

1. Connect all three modules to the power supply

2. Find the following setting on the controller module "System"> "Network" > "EXD reset node id's"

3. Set the value to 20

4. Cut out the supply voltage to the valve modules

5. Repeat the earlier procedure.

If you wish to check the addresses of the two valve modules, you should carry out the following:

1. Connect all modules to the power supply.

2. Immediately press on both the "X" and "Enter" buttons while the controller is starting up.

3. Find the display "CAN SETTINGS" > "ACTIVE NODES"

The two 1-digits represent the addresses 96 and 97 respectively. If you remove the connection to a valve module, the display of the address will also disappear.

Connections

Important!

Wait before connecting the power supply to the

modules!

32 A

6 A

(4)

6 A

(4)

In order to set the addresses 96 and 97, you must fol-

low the recommended procedure. See page 4.

Connection, lower level Connection, upper level

Warning!

+ must be connected

0.5 A

min. 50 mA

Ioﬀ < 1.5 mA

0.5 A

min. 50 mA

Ioﬀ < 1,5 mA

6 A

(4)

6 A

(4)

10 A

(3.5)

DO DO1 DO2 DO3 DO4 DO5 DO6 DO7 DO8 Σ 1-8

I Max. 10 A

U All 24 V or all 230 V a.c.

to +

(L to1to 1)

Warning

The supply voltage

of AI may not share

the signal with

other controllers.

Separate

supply

Electric noise

Signal cables for sensors, DI inputs, data communication

and display must be kept separate from high voltage

(230 V) electric cables:

- Use separate cable trays

- Keep a distance between high voltage and signal cables

of at least 10 cm

- Cables longer than 3 m at the DI input should be avoided

MAIN MODULE

HIGH PRESSURE MODULE Address = 96

AO - Analog output, 3 pcs. AO1, AO3, AO4

Must be used if using frequency converters or EC motors. Connect 24 V on N and L (separate power supply) Avoid earth fault current.

- Use double-insulated transformer. The secondary side must not be earthed. Obtain 0-10 volts from terminals Com-AO1, N-AO3 and N-AO4. PAY ATTENTION TO THE POLARITY of N. (AO3 and AO4 are galvanically isolated. AO1 is not).

AI - Analog inputs,

Pressure transmitters, 4 pcs. AI1 - AI4

AKS 32R / AKS 2050 / MBS 8250

10-90% ratiometric

Temperature sensors, 4 pcs. AI5 - AI8

• Pt 1000 ohm, AKS 11 or AKS 21.

DI - Digital switch inputs, 8 pcs. DI1 - DI8

The connection may be a shut-down or interruption function. Select what is to be activated during conﬁguration. (DI3 can be used as an AUX1 input, but only if regulated with 2 MT compressors).

Supply

24 V a.c. or d.c. Class II is required.

AK-PC 572 17 VA EXD 316, HP 10 VA EXD 316, rec 10 VA Stepper valve, HP _ _VA Stepper valve rec. _ _VA

Supply voltage to high pressure module

The power supply can be taken from the main module. It is important that + is connected to +.

Battery

Ensure that the valve closes if there is no supply voltage.

Stepper valve

FX ventil type CCMT. Connector: 5: WHITE 6: BLACK 7: RED 8: GREEN

Canbus

Data communication to the main module.

Sensor inputs

• Pt 1000 ohm, AKS 11 or AKS 21.

Contact input AUX 2

Signal from oil level, or input for fan alarm or another alarm.

Relay output AUX 2

Activation of de-superheating or hot gas dump.

RECEIVER MODULE Address = 97

Supply voltage to high pressure module

The power supply can be taken from the main module. It is important that + is connected to +.

Canbus

Communication to the high pressure module and to the receiver module "L" to "L" and "H" to "H" A jumper must be connected between "H" and "R". Terminate on the receiver module with a resistance of 120 ohm. If mounting an external display, the termination must be done diﬀerently. See next page.

Important! In order to set the addresses 96 and 97, you must follow the recommended procedure. See next page.

Modbus

It is important that the installation of the data communication cable is carried out correctly. See separate literature, no. RC8AC. Remember termination at the termination points.

DO - Digital outputs, 8 pcs. DO1-DO8

DO5 and DO6 are solid state relays. The outputs are used for connecting a Bitzer CRII. If a Bitzer CRII is not being connected, output DO6 can be used for activation of an oil valve. The relays are de-rated to the speciﬁed values. The alarm relay will be driven under normal operation and will drop in the event of alarms and insuﬃcient voltage to the controller. (DO3 can be used as an AUX1 output, but only if regulated with 2 MT compressors).

Battery

Ensure that the valve closes if there is no supply voltage.

Stepper valve

FX valve type CCMT. Connector: 5: WHITE 6: BLACK 7: RED 8: GREEN

Canbus

Data communication to the main module. The section must be terminated using a 120 ohm resistor.

Contact input AUX 3

Signal from heat recovery, or input for fan alarm or another alarm.

Relay output AUX 3

Activation of heat recovery, or AUX 3 output for de-superheating or hot gas dump.

External display

If an external display is connected, it must be connected to the controller using a wire with a plug. See order. Communication will take place via Canbus. The Canbus termination must be moved away from the controller and to the external display.

Bitzer CRII

The pulse signal can also be used to control one of the CRII with 2 unloaders (4 cylinders version). Compressor capacity can be controlled from 10 to 100% depending on the pulsation of the unloaders. The unloaders are connected to DO5 and DO6. Connect compressor relay to DO-MT1.

Unloader 2 follows unloader 1 but is oﬀset a ½ period.

Separate Sd monitoring of CRII

If separate Sd monitoring is desired, the temperature signal must be received from a thermostat that subsequently issues an on/ oﬀ signal to the compressor safety circuit.

Unload 1

Unload 2

Injection oﬀ

The electronic expansion valves in the cooling appliances must be closed when all the compressors are prevented from starting. As a result, the evaporators will not be ﬁlled with ﬂuid that can be led to a compressor when the regulation process restarts.

This function can be achieved through data communication.

Alternatively, wiring must be created using the compressor relays. When all compressors have been stopped, a signal must be issued to the evaporator controls that will subsequently close the expansion valves.

Data

Supply voltage

8 analog Input

8 digital input

Relay output to capacity control

3 Voltage output

Display output For type MMIGRS2

Data communication

Environments

Enclosure IP 20

Weight 0.4 kg

Mounting DIN-rail

Connection terminals max. 2.5 mm2 multi core

Approvals

24 V a.c. +/-15% 50/60 Hz, 17 VA 24 V d.c. (20-60 V ), 17 VA

Pressure meauring: 10-90%, ratiometric 1-5 volt 4-20 mA

Temperature measurement Pt 1000 ohm/0°C

From contact function E.g. to: Start/stop of regulation Monitoring of safety circuits General alarm function

4 pcs. SPDT (8A)

2 pcs. SPST (16A)

2 pcs. Solid State. PWM for scroll unloadl

0-10 V d.c. Ri = 1kohm Separate 24 V supply required

Modbus for AK-SM 800

Canbus for valve control modules and external display

-20 - 60°C, During operations

-40 - 70°C, During transport

20 - 80% Rh, not condensed

No shock inﬂuence / vibrations

EU Low Voltage Directive and EMC demands re CE-marking complied with LVD tested acc. EN 60730-1 and EN 60730-2-9 EMC-tested acc. EN61000-6-2 and 3 UL approval

AC-1: 6 A (ohmic) AC-15: 4 A (inductive)

AC-1: 10 A (ohmic) AC-15: 3,5 (inductive)

Imax. = 0.5A Imin. = 50 mA. Leakage<1.5 mA Not short-circuit protected

Installation considerations

Accidental damage, poor installation, or site conditions, can give rise to malfunctions of the control system, and ultimately lead to a plant breakdown. Every possible safeguard is incorporated into our products to prevent this. However, a wrong installation, for example, could still present problems. Electronic controls are no substitute for normal, good engineering practice. Danfoss will not be responsible for any goods, or plant components, damaged as a result of the above defects. It is the installer's responsibility to check the installation thoroughly, and to ﬁt the necessary safety devices. Special reference is made to the necessity of signals to the controller when the compressor is stopped and to the need of liquid receivers before the compressors. Your local Danfoss agent will be pleased to assist with further advice, etc.

Pressure transmitter / temperature sensor

Kindly refer to catalogue RK0YG...

Mounting/dimensions

For DIN rail mounting only (IP 20)

Ordering

Type Function Operation Supply voltage Code no.

AK-PC 572 Capacity controller With buttons and display 24 V 080G0320

EXD 316 Valve driver Operation from AK-PC 572 24 V 084B8042

MMIGRS2 Display unit With buttons and display - 080G0294

Wire for display unit,

L = 1.5 m, 1 pcs. 080G0075

L = 3 m, 1 pcs 080G0076

List of literature

Installation guide for extended operation RC8AC Here you can see how a data communication connection to ADAP-KOOL® Refrigeration control systems can be established.

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ADAP-KOOL®

Danfoss ADAP-KOOL AK-PC 572 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual