Danfoss AK-CH 650 Design guide

Service Guide

Capacity controller for water chiller

AK-CH 650

ADAP-KOOL® Refrigeration control systems

Menu list This menu function can be used together with system software type AKM. The description is divided

up into function groups that can be displayed on the PC screen. Within each group it is now possible to show the measured values, or settings. Regarding the use of AKM, reference is made to the AKM Manual.

Validity This menu operation (from January 2016 applies to controller type AK-CH 650, code number/

080Z0132 with programme version 2.0x.

Function groups

The operation is divided up into several function groups. When a selection has been made, push “OK”, and you may continue to the next display. By way of example, “Suction capacity control” has been selected here.

From the measure line the dierent values can be read. The values are constantly updated. In the list of settings the set values can be seen. If a setting has to be changed, select the parameter and proceed via “OK”.

Measurements The various measurements can be read directly. If a graphic display of the measurements is required,

up to eight of them can be shown. Select the required measurements and push “Trend”.

Settings Settings can only be made for the daily operation. Conguration settings cannot be seen, changed or

written out. They can only be made from the Service Tool programme.

There are four kinds of settings, ON/OFF settings, settings with a variable value, time settings and “reset alarms”.

Set the required value and push “OK”

2 Service Guide RC8BV402 © Danfoss 2016-02 AK-CH 650 Version 2.0x

Enter the new value or move the sliding scale up or down. The new value will apply, when “OK” is pushed.

Go through the individual functions one by one and make the required settings. When settings have been made for one controller, the set values may be used as basis in the other controllers of the same type and with the same software version. Copy the settings by using the copy settings function in the AKM programme, and adjust subsequently any settings where there are deviations.

NB! If a list is required for noting down the individual settings, a printout can be made of it with a function in the AKM programme. Read the next section, “Documentation”.

Documentation Documentation of the settings of the individual controllers can be made with the print function in the

AKM programme. Select the controller for which documentation of the settings is required and select the “Print Settings” function (cf. also the AKM Manual).

Functions Shown below are function groups with corresponding measurements and settings. A printout of the

given settings can be made using the AKM function “Print Settings” (see above).

Note It has been necessary to make selections among the many measurements and settings coming from

the controller. The operation from the AKM programme cannot contain them all. If there is a need for access to all measurements and settings, you should make use of Service Tool type AK-ST 500.

AK-CH 650 Version 2.0x Service Guide RC8BV402 © Danfoss 2016-02 3

Main settings

Measurements AK error When “ON”, the controller is in alarm condition. Comp. Ctrl. temp. Actual temperature for compressor control S4 Cold brine supply Actual cold brine supply temperature measured with S4 temp. sensor S3 Cold brine return Actual cold brine return temperature measured with S3 temp. sensor P0 °C Suction pressure in °C. (Measured with the pressure transmitter) Comp. ctrl. Ref. °C Actual reference temperature for compressor control Compressor cap. % Cut-in compressor capacity in % (of total capacity) Request Comp. Cap % Reference for compressor capacity (deviations may be due to time delays) Cond. ctrl. temp °C Actual temperature for control sensor (Pc or S7) S7 warm brine °C Actual warm brine temperature for S7 media sensor (Only used if S7 sensor is selected as regulation sensor) Pc °C Condensing pressure in °C. (measured with the pressure transmitter) Cond. ctrl. ref. °C Actual reference temp. for condenser capacity (incl. external reference signal, if any) Cond. cap. % Cut-in condenser capacity in % (of total capacity) Request Cond. cap % Reference for condenser capacity External Main Switch Status of input “Extern Main Switch”. In pos. “OFF” the regulation is stopped by force

Settings Main switch Main switch: ON: Regulation OFF: Controller stopped Conguration lock Lock of conguration. In order to select quick setup or select refrigerant type, the conguration lock must be “open”. Note: ”Main switch” must be OFF in order to set conguration lock in “open” position 0: Open 1: Locked Select quick setup Select a pre dened application. All in- and outputs will be pre-dened.

All setpoint will be adapted to the selected application. Please notice that the control ler will make a restart when a selection has been made. See AK-PC 840 manual for further details about the predened applications.

Refrigerant type Po Select refrigerant type

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 dened 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

Suction capacity control

Measurements AK error When “ON”, the controller is in alarm condition. Comp. Ctrl. temp. Actual temperature for compressor control S4 Cold brine supply Actual cold brine supply temperature measured with S4 temp. sensor S3 Cold brine return Actual cold brine return temperature measured with S3 temp. sensor P0 °C Suction pressure in °C. (Measured with the pressure transmitter) Comp. ctrl. Ref. °C Actual reference temperature for compressor control Compressor cap. % Cut-in compressor capacity in % (of total capacity) Request Comp. Cap % Reference for compressor capacity (deviations may be due to time delays) Cond. ctrl. temp °C Actual temperature for control sensor (Pc or S7) S7 warm brine °C Actual warm brine temperature for S7 media sensor (Only used if S7 sensor is selected as regulation sensor) Pc °C Condensing pressure in °C. (measured with the pressure transmitter) Cond. ctrl. ref. °C Actual reference temp. for condenser capacity (incl. external reference signal, if any) Cond. cap. % Cut-in condenser capacity in % (of total capacity) Request Cond. cap % Reference for condenser capacity MC dP0 oset K Actual displacement value for the suction pressure in connection with a “P0 Optimiser” function (Master control function in AKA gateway) S3 oset Contribution from reference displacement via S3 sensor Ext. Ref. Oset °C Contribution from external reference displacement Night setback Status of night setback function ON: Night (An increase of the evaporating pressure is permitted) OFF: Normal situation Suction status 0: Power up Controller has been powered up (power supply re-connected) 1: Stopped Capacity control has been stopped ("Main switch" = OFF or "Control mode" = OFF)

2: Manual Capacity is controlled manually ("Control mode" = MAN) 3: Alarm Capacity control is in alarm condition (fx. alarm on Po Min or Pc Max) 4: Restart Capacity control is waiting for elapse of “Restart time” 5: Standby Capacity control is ready to start 10: Full loaded All capacity cutin 11: Running Capacity control is running Actual Zone Actual zone for capacity regulation: 0: P0-error 1: - - Zone 2: - Zone 3: NZ 4: + Zone 5: + + Zone Load shed input 1 Actual status on Load shed input 1 Load shed input 2 Actual status on Load shed input 2 Liq. Inj. heat exch Liquid injection can be coordinated with the compressor operation: 0: no coordination 1: Synchronization with compressor operation 2: Last compressor is stopped only after pump down No. of compressors Dened number of compressors Comp. application Select the compressor application required (see AK-CH 650 manual for further details)

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

Sequential: Compressors are cut in/out in strict accordance with compressor number Cyclic: Runtime equalisation between compressors Best t: Compressors are cut in/out in order to make the best possible t to actual load 0: Sequential 2: Cyclic

3: Best t S4 Min 24h Minimum value for S4 temp. For the last 24 hours S4 Max 24h Maximum value for S4 temp. For the last 24 hours S4 Average 24h Average value for S4 temp. For the last 24 hours Extra cooling req. Brine temperature is higher than desired, and the relay "extra cooling" is active.

Settings Main switch Main switch: ON: Regulation OFF: Controller stopped Cap. control mode 0: MAN (The compressor capacity will be controlled manually) 1: OFF (The capacity control will be stopped) 2: AUTO (The capacity is controlled by the PI controller) Manual capacity % Manual setting of compressor capacity The value is in % of total capacity controlled by the controller Control sensor Choise of regulation sensor 0: P0 3: S4 Reference mode Choice of suction pressure reference

0: SP + Ext. Ref + Night + S3 oset: Used if you require override via 0-10V signal, S3

sensor or night setback.

1: SP + Po optimization: Used if you want to optimize the reference from the refrigeration appliance (network function) which is most used Setpoint °C Setting of required suction pressure in °C ++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

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