User guide
Controller tray for refrigeration
appliance control with TEV
AK-CT 200A + AK-CT 450A
ADAP-KOOL® Refrigeration control systems
AK-CT 450A
Introduction
Application
Complete refrigeration appliance control with great exibility to
adapt to all types of refrigeration appliances and cold storage
rooms.
• For refrigeration with brine
• For use with a thermostatic expansion valve (TEV)
Advantages
• Optimised for installation by manufacturer
• Electricity-controlled and voltage controlled relay connections
• Loads requiring electricity can be connected directly
• Overcurrent limitation
• Energy optimisation of the whole refrigeration appliance
• One controller for several dierent refrigeration appliances
• Quick set-up with predened settings
• Built-in data communication
• Built-in clock function with power reserve
Principle
The temperature in the appliance is registered by one or two
temperature sensors which are located in the air ow before the
evaporator (S3) or after the evaporator (S4) respectively.
A setting for thermostat, alarm thermostat and display reading
determines the inuence the two sensor values should have for
each individual function.
In addition product sensor S6, which can be optionally placed in
the appliance, can be used to register the temperature near the
required product in a certain place within the appliance.
The temperature of the evaporator is registered with the S5 sensor
which can be used as a defrosting sensor.
In addition to the output for the solenoid valve type EVR the controller has 9 relay outputs which are dened by the use selected –
the individual usage options are described in detail on page 12
Functions
• Day/night thermostat with ON/OFF or modulating principle
• Product sensor S6 with separate alarm limits
• Switch between thermostat settings via digital input
• Start of defrost via schedule, digital input or network
• Natural, electric, hot gas defrost or brine defrost
• Stop of defrost on time and/or temperature
• Coordination of defrosting among several controls
• Pulsing of fans when thermostat is satised
• Case cleaning function for documentation of HACCP procedure
• Rail heat control via day/night load or dew point
• Door function
• Control of two compressors
• Control of night blinds
• Light control
• Heat thermostat
• Integrated MODBUS communication with the option of
mounting a LonWorks communication card
Contents
Introduction ....................................................................................................... 2
Operation ............................................................................................................ 4
Applications .....................................................................................................12
Connections ..................................................................................................... 17
Appliance examples
Survey of functions ........................................................................................ 19
Operation .......................................................................................................... 32
Menu survey .....................................................................................................33
Ordering ............................................................................................................39
Data ..................................................................................................................... 40
2 User Guide RS8GR602 © Danfoss 2016-10 AK-CT 450A
Applications
Here is an overview of the controller’s usage options.
• Standard appliance or cooling room with one valve,
one evaporator and one cooling section.
• Refrigeration appliance with one valve, two evaporators
and two cooling sections (each with its own temperaturemeasuring function).
• Refrigeration device with one valve, one evaporator and
two cooling sections.
A setting will congure input and outputs so that the controller’s
operation interface is directed at the selected application.
The current settings for the respective uses can be found
on page 34.
Installation benets
The controller is designed to provide a number of advantages
when installed by the refrigeration appliance manufacturer,
such as:
High relay load
Load connection/disconnection is controlled by a voltage
measurement and a current measurement, so that the relay’s
switch function can operate under optimal conditions.
The controller can then connect loads of up to 16 A, without
the use of auxiliary relays.
Spring clamps
All cable connections are made using plugs with spring switches.
This allows for fast and easy installation.
Parallel power point
Several of the outlets have double or triple connections points,
so the use of external loop clips is not usually necessary.
Structure of the controller
The controller consists of hardware type AK-CT 200A and a
software identity code AK-CT 450A.
This software identity code is delivered in a separate plug
and must be placed in an RJ45 plug in the hardware. It is rst
necessary to mount the plug when conguring the controller.
AK-CT 450A User Guide RS8GR602 © Danfoss 2016-10 3
Operation
Cooling
Regulation can be performed on the basis of the following principles:
Direct expansion
The temperature is controlled either through the starting/stopping of a compressor or through the opening/closing of a solenoid valve in the liquid line.
Brine
Here, the temperature is controlled by opening/closing a solenoid
valve/motor valve in the brine supply.
Temperature control
The temperature in the appliance is registered by one or two
temperature sensors which are located in the air ow before the
evaporator (S3) or after the evaporator (S4) respectively. A setting
for the thermostat, alarm thermostat and display reading determines how much the two sensor values should inuence each
individual function, e.g. 50% will produce an equal value from
both sensors.
Various weightings can be set for day and night operation.
The actual temperature control can take place in two ways: as an
ordinary ON/OFF regulation with a dierential, or as a modulating control where the temperature variation will not be nearly as
great as in ON/OFF control. There is however a limit to the use of
a modulating control as it can only be used in DX central plant or
brine system.
In principle, regulation in this system is the same as described
above, but is now performed with a PI function. This results in
reduced uctuation of the regulated air temperature with stable
loads, giving a more constant air humidity.
The function gives a constant temperature regulation with a temperature value, which lies half-way between the on and o values
of the thermostat.
The operating parameters of the PI regulation are automatically
optimised via the preset on and o values and the degree of
opening of the valve.
The dierential aects the amplication of the regulator and can
therefore not be set to less than 2K in order to ensure regulation
stability.
In a decentralised plant the thermostat function with ON/OFF
control should be selected.
In a central plant the thermostat function may either be selected
for ON/OFF control or modulating control.
Temperature monitoring
Just as is possible for the thermostat, the alarm monitoring can
be set with a weighting between S3 and S4 so that you can decide
how much the two sensor values should inuence the alarm
monitoring. Minimum and maximum limits can be set for alarm
temperature and time delays. A longer time delay can be set
for high temperature alarms after defrosting, appliance cleaning
or start-up.
On /O
Modulating
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Thermostat bands
Thermostat bands can be used benecially for appliances where
dierent product types are stored which require dierent temperature conditions. It is possible to change between the two
dierent thermostat bands via a contact signal on a digital input.
Separate thermostat and alarm limits can be set for each thermostat band – also for the product sensor.
Night setback of thermostat value
In refrigeration appliances there may be big load dierences
between the shop’s opening and closing hours, especially if night
lids/blinds are used. The thermostat reference may be raised here
without it having any eect on the product temperature.
Change-over between day and night operation can take place,
as follows:
• via an external switch signal.
• via a signal from the data communication system.
Product sensor
A separate product sensor S6, which may be placed in the
appliance, can also be used and which can register and monitor
the temperature in the warmest part of the appliance. There are
separate alarm limits and time delays for the product sensor.
Appliance cleaning
This function makes it easy for the shop’s sta to carry out a
cleaning of the appliance according to a standard procedure.
Appliance cleaning is activated via a signal – as a rule via a key
switch placed on the appliance.
Appliance cleaning is carried out via three phases:
1 - at the rst activation the refrigeration is stopped, but the fans
keep on operating in order to defrost the evaporators. ”Fan” is
shown on the display.
2 - at the second activation the fans are also stopped and the
appliance can now be cleaned. ”OFF” is shown on the display.
3 - At the third activation refrigeration is recommenced.
The display will show the actual appliance temperature,
(o97 setting).
When appliance cleaning is activated a cleaning alarm is
transmitted to the normal alarm recipient. A later processing
of these alarms will document that the appliance has been
cleaned as often as planned.
Alarm monitoring
There are no temperature alarms during appliance cleaning.
Appliance shut-down
The function closes the solenoid valve and all outputs are
switched o.
The cooling appliance is stopped like the “Main switch”, but this
happens without an “A45 standby alarm”.
The function can be enabled by a switch on the DI input or via
a setting through data communication.
- + + °C
1 ÷ + Fan
2 ÷ ÷ O
3 + + °C
AK-CT 450A User Guide RS8GR602 © Danfoss 2016-10 5
Defrost
Depending on the application you may choose between the
following defrost methods:
Electric: The heating element is activated
Hotgas: Here the solenoid valves are controlled so that the
hotgas can ow through the evaporator
Brine: Here, the solenoid/motor valve is opened on the supply
pipe, so that hot brine can be fed through.
Natural: Here the fans are kept operating during the defrost
Defrost sequence
1) Pump down
2) Defrost
3) Waiting position after defrost
4) Draining (drain delay. Hotgas only)
5) Drip o
6) Delay of fan
Hot gas defrost (application 7 only)
This type of connection can be used on systems with hotgas
defrost, but only in small systems in, say, supermarkets – the
functional content has not been adapted to systems with large
charges.
Must not be used together with PMLX and GPLX valves, unless
a time delay relay is installed, which ensures that the PMLX/GPLX
valve is closed completely before the hotgas is turned on.
Drip tray heating element
It is possible to control a heating element in the drip tray for
hot gas defrosting. When defrosting is commenced, the heating
element is activated. The heating element remains activated until
a set time after defrosting has ended by time or temperature.
Start of defrost
A defrost can be started in dierent ways
Interval: Defrost is started at xed time intervals, say, every
eighth hour. An interval must ALWAYS be set to
a "higher" value than the period set between two
defrostings when a schedule or network signal is used.
Refrigeration time: Defrost is started at xed refrigeration time
intervals, in other words, a low need for refrigeration will
”postpone” the defrost
Schedule: Here defrost can be started at xed times of the
day and night. However, max. 6 times
Contact: Defrost is started with a contact signal on a digital input
Network: The signal for defrost is received from a system unit
via the data communication
Manual: An extra defrost can be activated from the controller’s
lower-most button
All the mentioned methods can be used at random – if just of
them is activated a defrost will be started.
Hot gas application
Stop of defrost
Defrosting can be stopped by either:
• Time
• Temperature (with time as safety).
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Coordinated defrost
There are two ways in which coordinated defrost can be arranged.
Either with wire connections between the controllers or via data
communication
Wire connections
The digital input DI2 is connected between the current controllers.
When one controller starts a defrost all the other controllers will
follow suit and likewise start a defrost. After the defrost the individual controllers will move into waiting position. When all are in
waiting position there will be a change-over to refrigeration.
Coordination via data communication
Here the system unit handles the coordination.
The controllers are gathered in defrosting groups and the system
unit ensures that defrosting is started in the group according to a
weekly schedule.
When a controller has completed defrosting, it sends a message
to the system unit and then goes into a waiting position. When
every controller in the group is in a waiting position, refrigeration
is again permitted in all the individual controllers.
Defrost based on refrigeration time
When the aggregate refrigeration time has passed a xed time,
a defrost will be started.
Max. 10 pcs.
System manager
Min. time between defrosts
There is a 2 hours minimum time between defrosts.
This avoids that planned defrosts in accordance with the weekly
schedule are carried out immediately after a defrost on demand
has been carried out. The time applies from when a Defrost based
on refrigeration time has been completed to when a planned
defrost is again permitted. Defrost based on refrigeration time will
not start defrosting with a shorter interval than the 2 hours either.
Melting function
This function will stop the air ow in the evaporator from being reduced by frost created by uninterrupted operation for a long time.
The function is activated if the thermostat temperature has
remained in the range between -5°C and +10°C for a longer
period than the set melting interval. The refrigeration will then be
stopped during the set melting period. The frost will be melted
so that the air ow and hence the evaporator’s capacity will be
greatly improved.
Real-time clock
The controller has a built-in real-time clock which can be used
to start defrosts. This clock has a power reserve of more than 24
hours.
If the controller is equipped with data communication, the clock
will automatically be updated from the system unit.
AK-CT 450A User Guide RS8GR602 © Danfoss 2016-10 7
Control of two compressors (application 8)
The two compressors must be of the same size.
When the controller demands refrigeration it will rst cut in
the compressor with the shortest operating time. After the time
delay the second compressor will be cut in.
When the temperature has dropped to ”the middle of the
dierential”, the compressor with the longest operation time
will be cut out.
The running compressor will continue until the temperature
has reached the cutout value. Then it will cut out. When the
temperature again reaches the middle of the dierential,
a compressor will again be started.
If one compressor cannot maintain the temperature within the
dierential, the second compressor will also be started.
If one of the compressors has run on its own for two hours,
the compressors will be changed over so that operational time
is balanced.
The two compressors must be of a type that can start up against
a high pressure.
The compressors’s settings for ”Min On time” and ”Min O time”
will always have top priority during normal regulation. But if one
of the override functions is activated, the ”Min On time” will be
disregarded.
Railheat
It is possible to pulse-control the power to the rail heat in order
to save energy. Pulse control can either be controlled according
to day/night load or dew point.
Pulse control according to day and night
Various ON periods can be set for day and night operation.
A period time is set as well as the percentage part of the period
in which the rail heat is ON.
Pulse control according to dew point
In order to use this function a system manager of the type AK-SM
is required which can measure dew point and distribute the
current dew point to the appliance controllers. For this the rail
heat’s ON period is controlled from the current dew point.
Two dew point values are set in the appliance control:
• One where the eect must be max. i.e.100%. (o87)
• One where the eect must be min. (o86).
At a dew point which is equal to or lower than the value in 086,
the eect will be the value indicated in o88.
In the area between the two dew point values the controller will
manage the power to be supplied to the rail heat.
During defrosting
The rail heating will be active during defrosting (as selected
in setting d27).
Rail heat
Dew point
8 User Guide RS8GR602 © Danfoss 2016-10 AK-CT 450A
Fan
Pulse control
To obtain energy savings it is possible to pulse control the power
supply to the fans at the evaporators.
Pulse control can be accomplished in one of the following ways:
- during the thermostat’s cutout period (cold room)
- during night operation and during the thermostat’s cutout
period (appliance with night lid)
A period of time is set as well as the percentage of this period of
time where the fans have to be operating.
Cutout of fans during plant breakdowns
If the refrigeration in a breakdown situation stops, the
temperature in the cold room may rise quickly as a result of the
power supply from large fans. In order to prevent this situation the
controller can stop the fans if the temperature at S5 exceeds a set
limit value.
Fan pause
When the setting P65 is set to a value greater than 0, the fans will
stop while the night blind is rolling down.
Eco-mode
When the night blind is down, the fan speed can be reduced.
Eco-mode is not allowed if the heating function has been
activated.
When Eco-mode is enabled, relay DO8 will be activated.
Period time
Light function
The function can be used for controlling the light in a refrigeration
appliance or in a cold room. It can also be used for controlling
a motorised night blind.
The light function can be dened in more than one way:
- The light is controlled via a signal from a door contact.
The light will remain on for 2 minutes after the door has been
shut.
- The light is controlled via the day/night function.
- The light is controlled via the data communication from
a system unit.
Here there are two operational options if data communication
should fail:
- The light can go ON.
- The light can stay in its current mode.
• Two signals, both of which can be on before the light goes on.
One can be a DI contact signal at the appliance (fx DI3) and the
other can be via data communication or a voltage signal.
Voltage signal must be activated on DI7.
The light is switched o when "r12" (Main switch) is set to o
(see o98).
The light is switched o when the appliance cleaning function
is activated.
If an override of the light is desired, this can be done via pulse
pressure on a DI input + setting = 19.
Extra light (light 2)
Light 2 can also be activated by one DI input, e.g. DI4.
It can also be controlled with two signals. For two signals,
the second signal must be sent with a voltage signal on DI8.
Light 1
controlled by
DI7
and fx DI3.
Light 2
(extra light)
controlled by
DI8 and fx DI4.
Override of light 1
AK-CT 450A User Guide RS8GR602 © Danfoss 2016-10 9
Night blind
Motorised night blind can be controlled automatically from
the controller. The night blinds will follow the status of the light
function. When the light is switched on, the night blinds opens
and when the light is switched o, the night blinds close again.
When the night blinds are closed, it is possible to open them
using a pulse signal on the digital input. If this input is activated,
the night blinds will open and the refrigeration appliance can
be lled with new products. If the input is activated again,
the blinds close again.
If the activation is omitted, the blind will close automatically
when the delay time expires. A setting is used to dene whether
the light is to be on or o when the night blind is up.
When the night blind function is used, the thermostat function
can control with dierent weighting between the S3 and S4
sensors. A weighting during day operation and another when
the blind is closed.
A night blind is open when the appliance cleaning function
is activated.
A setting can dene that the night blind is open when "r12"
(Main switch) is set to o (see o98).
Digital inputs
There are six digital inputs with contact function and two digital
inputs with high voltage signal.
They can be used for the following functions:
- Retransmission of contacts position via data communication
- Door contact function with alarm
- Starting or cancelling a defrost cycle
- Main switch - start/stop of cooling
- Night setback
- Thermostat bands switch
- General alarm monitoring
- Case cleaning
- Forced cooling
- Override of night blinds
- Coordinated defrost (DI2 only)
- Forced closing of valve
- Appliance shutdown
- Light, Extra light, Override light
Forced closing
The solenoid valve can be closed with an external signal
( "Forced closing").
If a defrost cycle is in progress, the forced closing status will not
be re-established until the defrost is completed. Otherwise,
the defrost cycle will be stopped immediately when the signal
is received. The function can be dened in o90. The signal can
be received from the DI3-input or via the data communication.
During a forced closing the fans can be dened to be stopped
or in operation.
Door contact
The door contact function can via the digital inputs be dened
for two dierent applications:
Alarm monitoring
The controller monitors the door contact and delivers an alarm
message if the door has been opened for a longer period than
the set alarm delay.
Alarm monitoring and stop of refrigeration
When the door is opened the refrigeration is stopped, i.e. the
injection, the compressor and the fan are stopped and light
switch on.
If the door remains open for a longer time than the set restart
time, refrigeration will be resumed. This will ensure that
refrigeration is maintained even if the door is left open or
if the door contact should be defective. If the door remains
open for a longer period than the set alarm delay an alarm
will also be triggered.
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Heating function
The heating function is used to prevent the temperature
becoming too low, e.g. in a cutting room, etc. The limit for
when the heating function cuts o is set as an oset value
under the current cutout limit for the refrigeration thermostat.
This ensures that refrigeration and heating do not occur
simultaneously. The dierence for the heating thermostat has
the same value as for the refrigeration thermostat. To prevent
that the heating thermostat cuts in during short-term drops
in air temperature a time delay can be set for when to change
from refrigeration to heating.
Data communication
The controller has xed built-in MODBUS data communication.
If there is a requirement for a dierent form of data
communication, a Lon RS 485 module can be inserted in the
controller.
The connection must then be to terminal RS 485.
(To use a Lon RS 485 module and gateway type AKA 245
the module must be Version 6.20 or higher.)
It is not possible, however, to show all parameters available
in AK-CT 450A).
Refrigeration
Neutral zone
Heat
Important
All connections to the data communication MODBUS and RS 485
must comply with the requirements for data communication
cables. See literature: RC8AC.
Display
The controller has two plugs for a display. Here display type
EKA 163B or EKA 164B (max. length 15m) can be connected.
EKA 163B is a display for readings.
EKA 164B is both for readings and operation.
(It is not possible to connect a display to the Modbus terminals,
as in the other AK-CC 450 controllers.)
If there are two cooling sections,
the bottom plug will be the A
section and the top plug will be
the B section.
If there is one cooling section,
the displays will be the same for
both plugs.
Override
The controller contains a number of functions which can be used together with the override function in the master gateway/system
manager.
Function via data communication Function in gateway/system manager Used parameters in AK-CT 450A
Start of defrosting Defrost control / Time schedule / Defrost group --- Def start
Coordinated defrost Defrost control / Defrost group --- HoldAfterDef / - - - DefrostState
Prevent defrost start --- Disable Def
Day/Night schedule Day/Night control / Time schedule / Light zone --- Night setback
Light control Day/Night control / Time schedule O39 light Remote
Forced closing Forced Close / Injection ON / AKC ON --- Forced cl.
Forced cooling --- Forced cool
Rail heat link to dew point / Enhanced railheat --- Dew point
P0 optimization P0 Optimization The controller supports P0 optimization
AK-CT 450A User Guide RS8GR602 © Danfoss 2016-10 11
Applications
Here is a survey of the controller’s eld of application.
The applications are all adapted for commercial refrigeration
systems in the form of either refrigeration appliances or cold
storage rooms.
A setting (o61) will dene the relay outputs so that the controller’s
interface will be targeted to the chosen application.
Control sensors and temperature monitoring function
S3 and S4 are temperature sensors. The application will determine
whether either one or the other or both sensors are to be used.
S3 is placed in the air ow before the evaporator. S4 after the
evaporator.
A percentage setting will determine how the control is to be
based.
If there are two cooling sections, S3b is used for section 2.
S5 is a defrost sensor and is placed on/in the ns of
the evaporator.
An S5B is also used when there are two evaporators, as well as
when there is a long, single evaporator.
S6 is a product sensor. S6B used when there are two sections.
Digital input
DI1 to DI6 is the on/o input that can be used, for example, for
one of the following functions: Door function, alarm function, defrost start, external main switch, nighttime operation, thermostat
reference switch, appliance cleaning, forced cooling, light, defrost
cancellation or defrost coordination.
DI7 and DI8 are 230 V inputs that can activate similar functions.
(For light function with two signals, the input is locked for
Light 1/Light 2.)
See the functions in the respective settings o02, o37, o84, etc.
Control of night blinds
Night blinds follow the status of the light function – when the
light is switched on, the night blinds are up and when the light is
switched o, the night blinds are down. In addition a digital input
provides the option of forced opening of the blinds so that the
appliance can be lled with products.
Heat thermostat
The heat thermostat is typically used if the temperature is to be
controlled within narrower limits, e.g. for cutting rooms, etc. The
heating thermostat can be set as a dierence in relation to the
cutout limit for the refrigeration thermostat so that simultaneous
refrigeration and heating are avoided.
Varmelegemet tilsluttes DO2 udgangen, og vil være aktiv under
The heating element is connected to the DO2 outlet and will be
active during regulation when the temperature becomes too low.
The outlet will also be active if electric defrost is required.
The function is dened by setting the delay time r63 lower than
the max. value.
The function cannot be used together with hot gas defrosting.
Function Input/Settings menu Setting
DI1 DI2 DI3 DI4 DI5 DI6 DI7 DI8
o02 o37 o84 P55 P56 P57 P58 P59
Not used + + + + + + + + 0
Follows DI’s status + + + + + + + + 1
Door contact function + + + + + + + + 2
Door alarm + + + + + + + + 3
Start defrost + + + + + + + + 4
Main switch + + + + + + + + 5
Nighttime operation + + + + + + + + 6
Thermostat band + + + + + + + + 7
DI alarm when closed + +
No function + + + + + +
DI alarm when open + +
No function + + + + + +
Appliance cleaning + + + + + + + + 10
Forced cooling + + + + + + + + 11
Night blind + + + + + + + + 12
Coordinated defrost +
No function + + + + + + +
Forced close + + + + + + + + 14
Appliance shutdown + + + + + + + + 15
Light + + + + + + + + 16
Extra light + + + + + + + + 17
No defrost + + + + + + + + 18
Override light + + + + + + + + 19
Example
If DI1 is used to start a defrost cycle, o02 must be set to 4.
8
9
13
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o61=
1
Standard use
2
Standard use
with 3-phase defrost
AK-CT 450A User Guide RS8GR602 © Danfoss 2016-10 13
Two cooling sections - two evaporators
3
Standard
Defrost on phase 1 and phase 3
Individual defrost stop with S5 and S5B
Two cooling sections - two evaporators
4
3-phase defrost
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Two cooling sections - one evaporator
5
Standard
6
Two cooling sections - one evaporator
3-phase defrost
AK-CT 450A User Guide RS8GR602 © Danfoss 2016-10 15
7
Hot gas defrosting.
Hot gas defrosting is adapted to commercial appliances/
rooms with limited system lling.
One relay controls the main valve in the suction line.
One relay controls the hot gas valve.
One relay controls the drain valve.
There is no time delay between stops of hot gas and start
of draining.
8
”Two-compressor” operation.
The two compressors must be of the same size. On start-up
(after defrosting, operational stop, etc.) both compressors are
started with a set time shift. One compressor starts at half the
dierential so that an optimum adaptation of compressor
capacity takes place for the current load in the appliance/
room. There is automatic runtime equalisation between the
compressors.
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Connections
Supply voltage
230 V, or 2 phases + neutral, or 3 phases + neutral. 50 Hz.
Neutral must be tted. If neutral is not in place, the controller can
be damaged. During assembly and disassembly, the power supply
must be interrupted).
DO1
Cooling or exhaust port valve
DO2
Defrost cycle or hot gas valve
DO3
Light
DO4
Light 2, compressor 2 or heating element in drip tray
DO5
Night blind or defrost cycle 2
DO6
Rail heat
DO7
Fan
AO1
Analogue output signal, 0-10 V
The signal will follow the EVR valve’s degree of opening
(OD=0% will display 0 V and OD=100% will display 10 V).
The output can be used to control one e.g. 6 minutes modulating
valve.DI1-DI6
Digital input signal.
The dened function is active when the input is closed/opened.
DI7-DI8
Digital input signal.
The dened function is active when the input receives 230 V.
(Forced closing is, however, active at 0 V)
Data communication
If data communication is used, it is important that the installation
of the data communication cable is performed correctly.
See separate literature No. RC8AC…
MODBUS
For data communication.
Terminal 133 = BTerminal 134 = A+
Terminal 135 = screen
RS485 (terminal 130, 131,132)
For data communication, but only if a data communication
module is inserted in the controller. The module can be a LON
RS485.
Terminal 130 = B (B-)
Terminal 131 = A (A+)
Terminal 132 = screen
DO8
Fan in economy mode or defrost 3 or drain valve
DO9
Alarm
There is a connection between terminal 100 and 101 in an alarm
situation, as well as when the controller is without voltage.
DOA
Connection of solenoid valve type EVR. The coil must be half wave
rectied.
S2
Not used
S3, S4, S5, S6
Pt 1000 ohm sensor or PTC 1000 ohm sensor. All have to be of
the same type.
S3, air sensor, placed in the warm air before the evaporator
S3B can be used on appliances with two cooling sections
S4, air sensor, placed in the cold air after the evaporator
(the need for either S3 or S4 can be deselected in
the conguration)
S5, defrost sensor, placed on the evaporator
S5B can be used on appliances with two evaporators,
or on models with long evaporators
S6, product sensor
S6B can be used on appliances with two cooling sections
Pressure transmitter
Not used
(For LON RS485 and gateway type AKA 245 the gateway must be
version 6.20 or higher.)
EKA Display
If there is be external reading/operation of the controller, display
type EKA 163B or EKA 164B can be connected.
Electric noise
Cables for sensors, DI inputs and data communication must be
kept separate from other electric cables:
- Use separate cable trays
- Keep a distance between cables of at least 10 cm
- Long cables at the DI input should be avoided.
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 t 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.
AK-CT 450A User Guide RS8GR602 © Danfoss 2016-10 17
Extra connection/terminal strip
There are 3 holes on the base in which
a terminal strip (type Wago 862-8593)
can be mounted.
There are holes for 2 terminal strips.
Stripping wire
The following demands for stripping, so the insulation does not
enter the spring clip.
ID module AK-CT 450A
This module contains a code which, together
with the others, will enable regulation using
an solenoid valve.
The installation and removal of the module must always be
performed while the appliance is voltage-free.
When the module is inserted in the plug, the controller can be set.
The settings will be saved in both the controller and the module.
A module with settings will always overwrite the settings in
the controller. An overwrite will be nished 3 seconds after the
controller is turned on.
The module can be removed from the controller for a short period
of time in order to transfer the settings to another, corresponding
controller. Remember to disconnect the voltage to ensure the
system is voltage-free.
If the controller registers a missing module, an alarm will be
issued. This alarm will be regularly repeated until the module is
inserted in the controller again.
If the controller is without a module for a longer period of time
(several days), the regulation will stop and all outputs are reset.
If it becomes necessary to erase all settings from the module, it
can be inserted into the controller and setting P61 can then be activated. Then remove the module without restarting the controller.
Coordinated defrost via
cable connections
A factory-new or “empty” module can be used to retrieve settings
based on a corresponding controller.
Insert the module into the controller from which the settings are
to be retrieved.
Turn on voltage.
Wait 3 seconds. Turn o again.
The module now contains all settings — including the Modbus
address.
Remember to change the address when the module has been
inserted into the receiving apparatus.
Max. 10 pcs.
The following controllers can be connected
up in this way:
EKC 204A, AK-CC 210, AK-CC 250,
AK-CC 450, AK-CC 550
AK-CT 550A, AK-CT 450A,
Refrigeration is resumed when all
controllers have “released” the signal for
defrost.
Coordinated defrost via
data communication
The setting of controllers to coordinate
their defrosting takes place in the
gateway/system manager.
Refrigeration is resumed when all
controllers have “released” the signal for
defrost.
18 User Guide RS8GR602 © Danfoss 2016-10 AK-CT 450A
Survey of functions
Function Para-
meter
Normal display
Normally the temperature value from one of the two thermostat sensors S3 or S4 or
a mixture of the two measurements is displayed.
In o17 the ratio is determined.
Thermostat Thermostat control
Set point
Regulation is based on the set value plus a displacement, if applicable. The value is set
via a push on the centre button.
The set value can be locked or limited to a range with the settings in r02 and r 03.
The reference at any time can be seen in "u91 Cutout temp".
Dierential
When the temperature is higher than the reference + the set dierential, the
compressor relay will be cut in. It will cut out again when the temperature comes
down to the set reference.
Ref. Dif.
Setpoint limitation
The controller’s setting range for the setpoint may be narrowed down, so that much
too high or much too low values are not set accidentally - with resulting damages.
To avoid a too high setting of the setpoint, the max. allowable reference value may
be lowered.
To avoid a too low setting of the setpoint, the min. allowable reference value may
be increased.
Correction of the display’s temperature
If the temperature at the products and the temperature received by the controller
are not identical, an oset adjustment of the display temperature can be carried out.
Temperature unit
Set here if the controller is to show temperature values in °C or in °F.
Correction of signal from S4
Compensation possibility due to long sensor cable
Correction of signal from S3 and S3B
Compensation possibility due to long sensor cable
Start / stop of refrigeration
With this setting refrigeration can be started, stopped or a manual override of the
outputs can be allowed. (For manual control the value is set at -1. Then the EVR outlet
and the relay outlets can be force-controlled by the respective reading parameters
(u23, u58, etc.). Here the read value can be overwritten.) Refer also to the menu
overview on page 33
Start / stop of refrigeration can also be accomplished with the external switch
function connected to a DI input.
Stopped refrigeration will give a ”Standby alarm”.
Night setback value
The thermostat’s reference will be the setpoint plus this value when the controller
changes over to night operation. (Select a negative value if there is to be cold
accumulation.)
Thermostat function
Here it is dened how the thermostat is to operate. Either as an ordinary ON/OFF
thermostat or as a modulating thermostat.
1: ON/OFF thermostat
2: Modulating
Parameter by operation via data
communication
Display air (u56)
Cutout °C
r01 Dierential
r02 Max cutout °C
r03 Min cutout °C
r04 Disp. Adj. K
r05 Temp. unit
°C=0. / °F=1
(Only °C on AKM, whatever
the setting)
r09 Adjust S4
r10 Adjust S3
r12 Main Switch
1: Start
0: Stop
-1: Manual control of outputs allowed
r13 Night oset
r14 Therm. mode
When operation is ”modulating” the EVR valve will limit the ow of refrigerant so
that the temperature variation will be less than for the ON/OFF thermostat.
The dierential (r01) must not be set lower than 2K for "modulating".
In a decentralised plant you must select the ON/OFF thermostat setting.
Selection of thermostat sensor
Here you dene the sensor the thermostat is to use for its control function. S3, S4, or
a combination of them. With the setting 0%, only S3 is used (Sin). With 100%, only S4.
AK-CT 450A User Guide RS8GR602 © Danfoss 2016-10 19
r15 Ther. S4 %
Melt function
Only for control of refrigeration (-5 to +10°C). The function ensures that the
evaporator will not be blocked by frost. Here you set how often the function is
to stop the refrigeration and hence transform the frost to water (or ice if there is
too much frost).
Melt period
Here you set how long an on-going melt function is to last.
Set point 2
The thermostat’s cutout value when the thermostat band 2 is activated via a digital
input.
Correction of signal from S6
Compensation possibility due to long sensor cable
Correction of signal from S6B
Compensation possibility due to long sensor cable
Selection of thermostat sensor S4% during night operation or night blinds down
Here you dene the sensor the thermostat is to use for its control function. S3, S4, or
a combination of them. With the setting 0%, only S3 is used (Sin). With 100%, only S4.
Heat function
Set the size of the Neutral Zone for changeover from cooling to heating
Time delay on transition from refrigeration phase to heating phase.
(there is not time delay on transition from heating phase to refrigeration phase).
The heating function is not active when the delay time is set to the max. value
(240 min.).
Product type
This function sets the temperature reference and associated alarm limits.
1=Vegetables, 8°C. 2=Milk, 0°C. 3=Meat/sh, -2°C. 4=Freeze, -20°C. 5=Ice, -24°C.
See overview on page 33.
Alarm Alarm settings
The controller can give alarm in dierent situations. When there is an alarm all the
light-emitting diodes (LED) will ash on the controller front panel, and the alarm
relay will cut in.
Alarm delay (short alarm delay on air temperature)
If the upper or the lower alarm limit values are exceeded, a timer function will
commence. The alarm will not become active until the set time delay has been
passed. The time delay is set in minutes.
Time delay for door alarm
The time delay is set in minutes.
The function is dened for a DI function, see o02, o37 or other DI.
Time delay for cooling (long alarm delay)
This time delay is used during start-up, during defrost, immediately after a defrost.
There will be change-over to the normal time delay (A03) when the temperature
has dropped below the set upper alarm limit.
The time delay is set in minutes.
Upper alarm limit
Here you set when the alarm for high temperature is to start. The limit value is set
in °C (absolute value).
The limit value will be raised during night operation. The value is the same as the one
set for night setback, but will only be raised if the value is positive.
In application 3 and 6, the setting is the same for S3 and S3B.
Lower alarm limit
Here you set when the alarm for low temperature is to start. The limit value is set in °C
(absolute value).
In application 3 and 6, the setting is the same for S3 and S3B.
Upper alarm limit for thermostat 2 (Thermostat band 2)
(Same function as for thermostat 1)
Lower alarm limit for thermostat 2 (Thermostat band 2)
(Same function as for thermostat 1)
Upper alarm limit for S6 temperature at thermostat 1 A22 HighLim1 S6
Lower alarm limit for S6 temperature at thermostat 1 A23 LowLim1 S6
Upper alarm limit for S6 temperature at thermostat 2 (Thermostat band 2) A24 HighLim2 S6
Lower alarm limit for S6 temperature at thermostat 2 (Thermostat band 2) A25 LowLim2 S6
S6 temperature alarm delay
The alarm is activated if one of the relevant alarm limits A22, A23, A24 or A25 is
exceeded. The time delay is set in minutes.
(Alarms will not activate when the setting is set to the maximum value. 240 min.)
r16 MeltInterval
r17 Melt period
r21 Cutout2 temp
r59 Adjust S6
r60 Adjust S6B
r61 Ther.S4% Ngt
r62 Heat NZ
r63 HeatStartDel
r89
Night setbck
(start of night signal. 0=Day, 1=Night)
With data communication the importance of the individual alarms can be
dened. Setting is carried out in the
“Alarm destinations” menu via AKM.
A03 Alarm delay
A04 DoorOpen del
A12 Pulldown del
A13 HighLim Air
A14 LowLim Air
A20 HighLim2 Air
A21 LowLim2 Air
A26 Al. Delay S6
20 User Guide RS8GR602 © Danfoss 2016-10 AK-CT 450A
Delay of a DI1 alarm
A cut-out/cut-in input will result in alarm when the time delay has been passed.
The function is dened in o02.
Delay of a DI2 alarm
A cut-out/cut-in input will result in alarm when the time delay has been passed.
The function is dened in o37
Signal to the alarm thermostat
Here you have to dene the ratio between the sensors which the alarm thermostat
has to use. S3, S4 or a combination of the two.
With setting 0% only S3 is used. With 100% only S4 is used.
(The setting also applies to a possible B section - S3B, S4)
Time delay on S6 (product sensor) for pull-down (long alarm delay)
This time delay is used for start-up, during defrosting, immediately after a defrost and
after an appliance clean.
A change is carried out to standard time delay (A26) when the temperature has
reached below the set upper alarm limit.
The time delay is set in minutes.
Alarm delay (short alarm delay on section B air temperature)
A timer function starts if the top or bottom alarm limit is exceeded. The alarm will rst
becomes active when the set delay time has been exceeded.
The time delay is set in minutes.
Compressor Compressor control
The compressor relay works in conjunction with the thermostat. When the
thermostat calls for refrigeration the compressor relay be operated.
Running times
To prevent irregular operation, values can be set for the time the compressor is to run
once it has been started. And for how long it at least has to be stopped.
The running times are not observed when defrosts start.
Min. ON-time (in minutes) c01 Min. On time
Min. OFF-time (in minutes) c02 Min. O time
Time delay for couplings of two compressors
Settings indicate the time that has to elapse from the rst relay cuts in and until
the next relay has to cut in.
Defrost Defrost control
The controller contains a timer function that is zeroset after each defrost start.
The timer function will start a defrost if/when the interval time is passed.
The timer function starts when voltage is connected to the controller, but it is
displaced the rst time by the setting in d05.
If there is power failure the timer value will be saved and continue from here when
the power returns.
This timer function can be used as a simple way of starting defrosts, but it will always
act as safety defrost if one of the subsequent defrost starts is not received.
The controller also contains a real-time clock. By means of settings of this clock and
times for the required defrost times, defrost can be started at xed times of the day.
Defrost start can also be accomplished via data communication, via contact signals or
manual start-up.
All starting methods will function in the controller. The dierent functions have to be
set, so that multiple defrosts are avoided..
Defrost can be performed using electricity, hot gas, naturally or brine.
The actual defrost will be stopped based on time or temperature with a signal from
a temperature sensor.
Defrost method
Here you set whether defrost is to be accomplished with electricity, gas, "air" or brine.
During defrost the defrost relay will be cut in.
A27 AI.Delay DI1
A28 AI.Delay DI2
A36 Alarm S4%
A52 PullD del.S6
A53 AI.Delay S3B
Reset alarm
EKC error
c05 Step delay
u58 comp1/LLSV
Here you can read the status of the
compressor relay.
d01 Def. method
0 = non. 1 = El. 2 = Gas. 3 = Brine.
4 = Air.
Defrost stop temperature
The defrost is stopped at a given temperature which is measured with a sensor
(the sensor is dened in d10).
The temperature value is set.
AK-CT 450A User Guide RS8GR602 © Danfoss 2016-10 21
d02 Def. Stop Temp
Interval between defrost starts
The function is zeroset and will start the timer function at each defrost start.
When the time has expired the function will start a defrost.
The function is used as a simple defrost start, or it may be used as a safeguard if
the normal signal fails to appear.
If master/slave defrost without clock function or without data communication is used,
the interval time will be used as max. time between defrosts.
If a defrost start via data communication does not take place, the interval time will be
used as max. time between defrosts.
When there is defrost with clock function or data communication, the interval time
must be set for a somewhat longer period of time than the planned one, as the
interval time will otherwise start a defrost which a little later will be followed by
the planned one.
In connection with power failure the interval time will be maintained, and when
the power returns the interval time will continue from the maintained value.
The interval time is not active when set to 0.
Max. defrost duration
This setting is a safety time so that the defrost will be stopped if there has not already
been a stop based on temperature or via coordinated defrost.
(The setting is the defrost time if d10 is set to 0.)
Time staggering for defrost cutins during start-up
The function is only relevant if you have several refrigeration appliances or groups
where you want the defrost to be staggered in relation to one another. The function is
furthermore only relevant if you have chosen defrost with interval start (d03).
The function delays the interval time d03 by the set number of minutes, but it only
does it once, and this at the very rst defrost taking place when voltage is connected
to the controller.
The function will be active after each and every power failure.
Drip-o time
Here you set the time that is to elapse from a defrost and until the compressor is to
start again. (The time when water drips o the evaporator).
d03 Def Interval
(0=o)
d04 Max Def. time
d05 Time Stagg.
d06 DripO time
Delay of fan start after defrost
Here you set the time that is to elapse from compressor start after a defrost and until
the fan may start again. (The time when water is “tied” to the evaporator).
Fan start temperature
The fan may also be started a little earlier than mentioned under “Delay of fan start
after defrost”, if the defrost sensor S5 registers a lower value than the one set here.
Fan cut in during defrost
Here you can set whether fan is to operate during defrost.
0: Stopped (Runs during pump down)
1: Running (stopped during "fan delay")
2: Running during pump down and defrost. After that stopped
Defrost sensor
Here you dene the defrost sensor.
0: None, defrost is based on time
1: S5
2: S4
3: S5+S5B (In application 3, there is an individual defrost stop at S5 and S5B. In the
other applications, the defrost cycle is stopped when both sensors register the
stop temperature.)
Pumpdown delay
Set the time where the evaporator is emptied of refrigerant prior to the defrost.
Drain delay (only in connection with hotgas)
Set the time where the evaporator is emptied of condensed refrigerant after
the defrost.
Defrost on demand – aggregate refrigeration time
Set here is the refrigeration time allowed without defrosts. If the time is passed,
a defrost will be started.
With setting = 0 the function is cut out.
Delay on stop of heating in the drip tray
The time applies from the time the defrost stops by time or temperature to the time
the heating element in the drip tray needs to be disconnected.
Postpone alarm info for timed stop
The defrost stop by temperature has failed. It has stopped by time, which will result
in an alarm notication. Wait to send an alarm until x consecutive alarms have
registered subsequent “timed stop alarms”. The counter is reset after each correct
stop by temperature.
d07 FanStartDel
d08 FanStartTemp
d09 FanDuringDef
d10 DefStopSens.
d16 Pump dwn del.
d17 Drain del
d18 MaxTherRunT
d20 Drip Tray del
d26 NumMaxDefAl.
22 User Guide RS8GR602 © Danfoss 2016-10 AK-CT 450A
Rail heat during defrost cycle
Here you can set how the rail heat is to be regulated during a defrost cycle.
0: No rail heat
1: No change; continues as during regulation.
2: 100% on
If you wish to see the temperature at the defrost sensor, push the controller’s
lowermost button. (May be changed to another function in o92.)
If you wish to start an extra defrost, push the controller’s lowermost button for
four seconds.
You can stop an ongoing defrost in the same way
Fan Fan control
Fan stop temperature
The function stops the fans in an error situation, so that they will not provide power
to the appliance. If the defrost sensor S5 registers a higher temperature than the one
set here, the fans will be stopped. There will be re-start at 2 K below the setting.
The function is not active during a defrost or start-up after a defrost.
With setting +50°C (=max. value) the function is interrupted.
Pulse operation of fan
0: No pulse operation
1: Pulse operation when the thermostat does not call for refrigeration
2: Pulse operation when the thermostat does not call for refrigeration, but only
during night operation
Pulse operation period for fan
Here the overall pulse time is set. The sum of ON-to and OFF time.
ON time for fan
Here the % part of the period the fans are to be in operation is set.
Max. S4 temperature during defrost
Here the maximum S4 temperature during a defrost cycle can be set. If the value
is exceeded, the fans will be stopped. The function is not active when the themperature is set to max value (15°C).
Parameter for cooling function
Period time for the pulse width period (PWM)
Expert setting - The value should only be changed by specially trained sta.
Max. opening degree at PWM n64 Pwm Max. OD
Min. opening degree at PWM n65 Pwm Min. OD
Wind up factor at PWM
Expert setting - The value should only be changed by specially trained sta.
Amplication factor at PWM
Expert setting - The value should only be changed by specially trained sta.
Integration time at PWM
Expert setting - The value should only be changed by specially trained sta.
d27 Railh. at def
Defrost temp.
Def Start
Here you can start a manual defrost
Hold After Def
Shows ON when the controller is
operating with coordinated defrost.
Disable def.
Defrost in progress can be stopped
Defrost State
Status on defrost
1= pump down / defrost
MC def. start
The system unit can start/prevent
a defrost cycle
F04 FanStopTemp.
F05 FanPulseMode
F06 Fan cycle
F07 Fan ON %
F22 FanStopS4Def
u59 Fan Relay
Here you can read the fan relay status,
or force-control the relay in “Manual
control” mode.
n63 Pwm Period
n66 PwmWindUpFac
n67 Pwm Kp fact.
n68 Pwm Tn sec
Forced cool.
(start of forced cooling)
Forced close
(forced stop of cooling)
AK-CT 450A User Guide RS8GR602 © Danfoss 2016-10 23
Internal defrosting schedule/clock function
(Not used if an external defrosting schedule is used via data communication.)
Up to six individual times can be set for the defrost start throughout the day.
Defrost start, hour setting t01-t06
Defrost start, minute setting (1 and 11 belong together, etc.)
When all t01 to t16 equal 0 the clock will not start defrosts.
Real-time clock::
In the event of a power failure of less than four hours, the clock function will be saved.
Clock: Hour setting t07
Clock: Minute setting t08
Clock: Date setting t45
Clock: Month setting t46
Clock: Year setting t47
Electricity monitoring
Current amount of electricity through relay 1 L11 DO1 Amp
Same for relays 2 to 8 L12-18 DO2 Amp......DO8 Amp
Fuse status for relay circuit 1, O=interrupted, On=ok.
A broken fuse must be restored with the setting=”On”
Same for relays 2 to 8 L22-28 DO2 Fuse...... DO8 Fuse
Set the electricity value at which the relay should cut out in the event of overcurrent
Recommended setting = measured consumption +25%. (In setting = 0 the current
monitor will be cancelled).
Same for relays 2 to 8 L32-38 DO2 FuseSize...... DO8 FuseSize
Current voltage at phase F1 L51 L1 voltage
Current voltage at phase F2 L52 L2 voltage
Current voltage at phase F3 L53 L3 voltage
Alarm limit for low DO2 load. (Not application 7)
An alarm is issued if the electricity consumption becomes lower than the set value.
Alarm limit for low DO5 load (Application 2,4 and 6 only) L65 DO5 Low Load
Alarm limit for low DO6 load L66 DO6 Low Load
Alarm limit for low DO8 load (Application 2, 3, 4 and 6 only) L68 DO8 Low Load
Miscellaneous Miscellaneous
Delay of output signal after start-up
After start-up or a power failure the controller’s functions can be delayed so that
overloading of the electricity supply network is avoided.
Here you can set the time delay.
Digital input signal - DI1
The controller has a digital input 1 which can be used for one of the following
functions:
O: The input is not used
1) Status display of a contact function
2) Door function. When the input is open it signals that the door is open. The
refrigeration and the fans are stopped and light switched on. When the time
setting in “A04” is passed, an alarm will be given. The cooling will restart when
the time in o89 has passed
3) Door alarm. When the input is open it signals that the door is open. When the time
setting in “A04” is passed, there will be alarm.
4) Defrost. The function is started with a pulse signal. (see also o37)
5) Main switch. Regulation is carried out when the input is short-circuited, and
regulation is stopped when the input is put in pos. OFF.
6) Night operation. When the input is short-circuited, there will be regulation for
night operation.
7) Thermostat band changeover. Switch to thermostat 2 (r21) when input is closed.
8) Separate alarm function. Alarm will be given when the input is short-circuited.
9) Separate alarm function. Alarm will be given when the input is opened. (For 8 and
9 the time delay is set in A27)
10) Case cleaning. The function is started with a pulse signal. See also description on
page 5.
11) Forced cooling(used for hot gas defrosting) when input is closed.
12) Night cover. Pulse signal activates night blind.
13) Not used.
14) Forced close when input is interrupted.
15) Appliance shutdown when input is closed.
16) Light. DO3 pulls when the input is closed.
17) Extra light. DO4 pulls when the input is closed.
18) Cancel defrost cycle. All defrost cycles are cancelled when the input is closed.
19) Override light (pulse signal)
t11-t16
L21 DO1 Fuse
L31 DO1 FuseSize
L62 DO2 Low Load
o01 DelayOfOutp.
o02 DI 1 Cong.
Denition takes place with the numerical value shown to the left.
(0 = o)
u10 DI1 state
(Measurement)
The DI input’s present status is shown
here. ON or OFF.
24 User Guide RS8GR602 © Danfoss 2016-10 AK-CT 450A
If the controller is built into a network with data communication, it must have an
address, and the master gateway of the data communication must then know this
address.
The address is set between 0 and 240, depending on the system unit and the selected
data communication. If the system unit is gateway type AKA 245, the version must be
6.20 or higher.
The address is sent to the gateway when the menu is set in pos. ON
IMPORTANT: Before you set o04, you MUST set o61. Otherwise you will be
transmitting incorrect data.
(The function is not used when the data communication is MODBUS)
Access code 1 (Access to all settings)
If the settings in the controller are to be protected with an access code you can set a
numerical value between 0 and 100. If not, you can cancel the function with setting 0.
(99 will always give you access).
Sensor type for S3, S4, S5, S6, S3B, S5B, S6B
Normally a Pt 1000 sensor with great signal accuracy is used. But you can also use
a sensor with another signal accuracy. That may either be a PTC sensor (1000 ohm
at 25°C)
All the mounted sensors S3-S6 must be of the same type.
Max. standby time after coordinated defrost
When a controller has completed a defrost it will wait for a signal which tells that the
refrigeration may be resumed. If this signal fails to appear for one reason or another,
the controller will itself start the refrigeration when this standby time has elapsed.
Select signal for the display S4%
Here you dene the signal to be shown by the display.
S3, S4, or a combination of the two.
With setting 0% only S3 is used. With 100% only S4.
Digital input signal - D2
The controller has a digital input 2 which can be used for one of the following
functions:
O: The input is not used.
1) Status display of a contact function
2) Door function. When the input is open it signals that the door is open. The refrigeration and the fans are stopped and light turn on. When the time setting in “A04”
has passed, an alarm will be issued. The cooling is restarted when the time in o89
has passed.
3) Door alarm. When the input is open it signals that the door is open. When the time
setting in “A04” is passed an alarm will be given.
4) Defrost. The function is started with a pulse signal. The controller will register when
the DI input is activated. The controller will then start a defrost cycle. If the signal is
to be received by several controllers (coordinated defrost) it is important that ALL
connections are mounted the same way (DI to DI and GND to GND).
5) Main switch. Regulation is carried out when the input is short-circuited, and
regulation is stopped when the input is put in pos. OFF.
6) Night operation. When the input is short-circuited, there will be regulation for
night operation.
7) Thermostat band changeover. Switch to thermostat 2 (r21) when the input is
closed.
8) Separate alarm function. Alarm will be given when the input is short-circuited.
9) Separate alarm function. Alarm will be given when the input is opened. (For 8 and
9 delay time is set in A28)
10) Case cleaning. The function is started with a pulse signal. See also description on
page 5.
11) Forced refrigeration at hotgas defrost when the input is short-circuited.
12) Night blinds. Pulse signal activates night blind.
13) The input is used for coordinated defrost in conjunction with other controllers
of the same type.
14) Forced close when input is interrupted.
15) Appliance shutdown when input is closed.
16) Light. DO3 pulls when the input is closed.
17) Extra light. DO4 pulls when the input is closed.
18) Cancel defrost cycle. All defrost cycles are cancelled when the input is closed.
19) Override light (pulse signal)
o03
o04
o05 Acc. code
o06 SensorCong
Pt = 0
PTC = 1
o16 Max HoldTime
o17 Disp. S4%
o37 DI2 cong.
AK-CT 450A User Guide RS8GR602 © Danfoss 2016-10 25
Conguration of light function
(If night blind selected, it will be synchronised with the light function)
1) Light is controlled via day/night status
2) Light is controlled via data communication and "Light remote o39"
3) Light is controlled by door contact, as dened via a DI input where the setting is
selected as either 2 or 3. When the door is opened the relay will cut in. When the
door is closed again there will be a time delay of two minutes before the light is
switched o.
4) As "2" but if there are any 15-minute network errors, the light will switch on and
the night blind will open.
5) Light controlled with local DI switch and a central signal from either data communication or a 230 V signal on DI7. Both must be on before the light is turned on.
6) Like “5”, but manual control of the night blind will also activate the light, which
means the light will switch on when the night blind is up.
Activation of light relay
Here the relay can be activated, but only if a setting of 2, 5 or 6 has been dened in
o38.
Rail heat during day operation
The ON period is set as a percentage of the time
Rail heat during night operation
The ON period is set as a percentage of the time
Rail heat cycle
The period of time for the aggregate ON time + OFF time is set in minutes
Case cleaning
The status of the function can be followed here or the function can be started
manually.
0 = Normal operation (no cleaning)
1 = Cleaning with fans operating. All other outputs are O.
2 = Cleaning with stopped fans. All outputs are O.
If the function is controlled by a signal at a DI-input, the relevant status can be seen
here in the menu.
Selection of application
The controller can be dened in various ways. Here you set which of the
8 applications is required. On page 13 to 16 you can see a survey of applications.
This menu can only be set when regulation is stopped, i.e. “r12” is set to 0.
Access code 2 (Access to adjustments)
There is access to adjustments of values, but not to conguration settings. If the
settings in the controller are to be protected with an access code you can set a
numerical value between 0 and 100. If not, you can cancel the function with setting 0.
If the function is used, access code 1 (o05) must also be used.
Save as factory setting
With this setting you save the controller’s actual settings as a new basic setting
(the earlier factory settings are overwritten).
Digital input signal - DI3 Switch signal
The controller has a digital input 3 which can be used for one of the following
functions:
O: The input is not used.
1) Status display of the switch function
2) Door function. When the input is open it signals that the door is open. The refrigeration and the fans are stopped and light turn on. When the time setting in “A04”
has passed, an alarm will be issued. The cooling is restarted when the time in o89
has passed.
3) Door alarm. When the input is open it signals that the door is open. When the time
setting in “A04” is passed an alarm will be given.
4) Defrost. The function is started with a pulse signal. (see also o37)
5) Main switch. Regulation is carried out when the input is closed, and regulation is
stopped when the input is open.
6) Night operation. When the input closed, there will be regulation for night
operation.
7) Thermostat band changeover. Switch to thermostat 2 (r21) when the input
is closed.
8) Not used.
9) Not used.
10) Case cleaning. The function is started with a pulse signal. See also description
on page 5.
11) Forced refrigeration at hotgas defrost when the input is closed.
12) Night cover. Pulse signal activates night blind
13) Not used
14) Forced closing when input is interrupted.
15) Appliance shutdown when input is closed.
16) Light. DO3 pulls when the input is closed.
17) Extra light. DO4 pulls when the input is closed.
18) Cancel defrost cycle. All defrost cycles are cancelled when the input is closed.
19) Override light (pulse signal)
o38 Light cong
o39 Light remote
o41 Railh.ON day%
o42 Railh.ON ngt%
o43 Railh. cycle
o46 Case clean
o61 Appl. Mode
o64 Acc. code 2
o67 -
o84 DI3 cong.
26 User Guide RS8GR602 © Danfoss 2016-10 AK-CT 450A
Rail heat control
The rail heat can be controlled in several ways:
0: The function is not used
1: Pulse control is used with a timer function following the day/night operation
(o41 and o42)
2: Pulse control is used with a dew point function. This function requires that a signal
is received about the dew point value. The value is measured by a system manager
and sent to the controller via the data communication.
Dew point value where the rail heat is minimum
This function is discussed earlier in the manual.
Dew point value where the rail heat is maximum
This function is discussed earlier in the manual.
Lowest permitted rail heat eect
Here the % part of the eect to be achieved when the dew point value is minimum.
o85 Railh. mode
o86 DewP Min lim
o87 DewP Max lim
o88 Rail Min ON%
Start of refrigeration when door is open
If the door has been left open, refrigeration must be started after a set time. That time
can be set here.
Fan operation for forced closing
If “forced closing” is activated, it will aect the operation of the fan and the defrosting.
Select the desired settings:
0: The fans will stop. Defrosting permitted.
1: The fans will run. Defrosting permitted.
(For 0 and 1: If the “forced closing” signal comes during a defrosting cycle,
or if a new defrosting cycle begins, the fans will follow the setting in d09.)
2: The fans will stop. Defrosting not permitted.
3: The fans will run. Defrosting not permitted.
(For 2 and 3: If the “forced closing” signal interrupts a defrosting cycle
but disappears again within 10 minutes, the defrosting cycle will resume.)
Alternative display
A reading can be displayed by pressing the lower button on the controller. This
reading is set from the factory so that the defrosting stop temperature is displayed.
A dierent setting will give the following reading:
1: (Defrost stop temperature = factory setting)
2: S6 temperature
Display of temperature during normal operation
1: Air temperature. Weighted S3 + S4
2: Product temperature S6
Light and night blinds denition
0: Light is switched o and night blinds are open when the main switch is o
1: Light and night blinds are independent of main switch.
Conguration of alarm relay
The alarm relay will be activated upon an alarm signal from the following groups:
0 - No relay function
1 - High temperature alarms
2 - Low temperature alarms
4 - Sensor error
8 - Digital input enabled for alarm
16 - Defrosting alarms
32 - Miscellaneous
64 - Injection alarms
128 - Disconnected fuse
The groups that are to activate the alarm relay must be set by using a numerical value
which is the sum of the groups that must be activated.
(E.g.: a value of 5 will activate all high temperature alarms and all sensor error.
Digital input signal - DI4. Switch signal. See DI3 above P55 DI4 cong.
Digital input signal - DI5. Switch signal. See DI3 above P56 DI5 cong.
Digital input signal - DI6. Switch signal. See DI3 above P57 DI6 cong.
Digital input signal - DI7. High voltage signal. Functions the same as those
for DI3, but signal is 0 V/230 V. See also the summary on page 12.
Digital input signal - DI8. High voltage signal. See DI7 above P59 DI8 cong.
Max. opening time for night blind after manual DI activation
The delay time before the night blind automatically goes down again after being
manually opened for product stocking.
Reset settings on ID module
Reset all settings so that the ID module can receive settings from another controller.
o89 DoorInjStart
o90 Fan forcedCl
o92 Displ menu 2
o97 Disp. Ctrl.
o98 Light MS = O
P41 Al.Rel.Conf.
P58 DI7 cong.
P60 BlindOpenTim
P61 ResetID Mem.
Conguration of night blind function
On= night blind function used. O=night blind function not used.
AK-CT 450A User Guide RS8GR602 © Danfoss 2016-10 27
P64 Blind cong
Fan pause while night blind rolls down
Here you can set the fan pause time, so the night blind can roll down unhindered
to the correct position.
Max. on time for light after manual DI activation
Delay time before light goes o again after light has been turn on manual due to
product stocking.
Service Service
Temperature measured with S5 sensor u09 S5 temp.
Status on DI1 input. on/1=closed u10 DI1 status
Read the duration of the ongoing defrost or the duration of the last completed
defrost.
Temperature measured with S3 sensor u12 S3 air temp
Status at the day-/night operation (night operation: on/o) u13 Night Cond.
Temperature measured with S4 sensor u16 S4 air temp
Thermostat temperature u17 Ther. air
Read the ongoing cutin time for the thermostat or the duration of the last
completed cutin
Read the valve’s actual opening degree u23 Valve OD %
Read the temperature at the S6 sensor u36 S6 temp
Status on DI2 input. on/1=closed u37 DI2 status
Air temperature. Weighted S3 + S4 u56 Display air
Measured temperature for alarm thermostat u57 Alarm air
* Status on relay for cooling u58 Comp1/LLSV
Status on relay for fan u59 Fan relay
* Status on relay for defrost u60 Def. relay
Status on relay for railheat u61 Railh. relay
* Status on relay for alarm
Status on relay for light u63 Light relay
* Status on relay for hot gas valve u64 SuctionValve
* Status on relay for compressor 2 u67 Comp2 relay
* Temperature measured with S5B sensor
* Temperature measured with S3B sensor
* Temperature measured with S6B sensor
* Status on relay for hot gas
* Status on relay for heating element in drip tray
* Status on relay for night blinds
* Status on relay for defrost 2
* Readout of the actual rail heat eect in %
Readout of which thermostat used for regulation: 1= Thermostat 1,
2= Thermostat 2
Status on input DI3 (closed / open)
Readout of the actual cutin value for the thermostat
Readout of the actual cut out value for the thermostat
* Measured temperature for alarm thermostat for B section
* Air temperature. Weighted S3 + S4 temp. for B section
* Status of relay for light 2 U36 Extra light
* Status of relay for ECO fan U37 Fan Eco
* Status of relay for defrost 3 U38 Def. relay 3
Status of DI4 input. On=closed U39 DI4 status
Status of DI5 input. On=closed U40 DI5 status
Status of DI6 input. On=closed U41 DI6 status
Status of high-voltage input DI7, 230 V = 1 = closed U42 DI7 status
Status of high voltage input DI8, 230 V = 1 = closed U43 DI8 status
0-10 V output indicates EVR valve’s degree of opening U44 AO1 voltage
P65 BlindFanStop
P66 Light On Time
Case shutdown
u11 Defrost time
u18 Ther runtime
u62 Alarm relay
u75 S5 temp. B
u76 S3 air temp B
u79 S6 temp. B
u80 Hotgas valve
u81 Drip tray
u82 Blinds relay
u83 Def. relay 2
u85 Rail DutyC %
u86 Ther. band
u87 DI3 status
u90 Cutin temp.
u91 Cutout temp.
U34 Alarm air B
U35 Display air B
28 User Guide RS8GR602 © Danfoss 2016-10 AK-CT 450A
Modbus communication status, 0% = none; 100% = everything ok U45 Comm. status
Read usage of DI2 signal: 0 = see status in u37; 1 = output for coordinated defrost U54 DI2 In/Out
Status of relay for drain valve, 1 = on U55 Drain valve
ON indicates controller error
Dewpoint value received from system unit
*) Not all will be displayed. Only the function belonging to the selection application is displayed.
EKC error
Dew point
AK-CT 450A User Guide RS8GR602 © Danfoss 2016-10 29
Operating status (Measurement)
The controller goes through some regulating situations where it is just waiting for
the next point of the regulation. To make these “why is nothing happening” situations
Ctrl. state:
(Shown in all menu displays)
visible, you can see an operating status on the display. Push briey (1s) the upper button. The individual status codes have the following meanings:
Waiting for end of the coordinated defrost S1 1
When the compressor is operating it must run for at least x minutes. S2 2
When the compressor is stopped, it must remain stopped for at least x minutes. S3 3
The evaporator drips o and waits for the time to run out S4 4
Refrigeration stopped by main switch. Either with r12 or a DI-input S10 10
Refrigeration stopped by thermostat S11 11
Defrost sequence. Defrost in progress S14 14
Defrost sequence. Fan delay — water attaches to the evaporator S15 15
Forced closing.
S16 16
Refrigeration stopped due to stopped injection function
Door is open. DI input is open S17 17
Melt function in progress. Refrigeration is interrupted S18 18
Modulating thermostat control S19 19
Emergency cooling due to sensor error S20 20
Normal control S23 23
Manual control of outputs S25 25
Case cleaning S29 29
Forced cooling S30 30
Delay on outputs during start-up S32 32
Heat function is active S33 33
Appliance shutdown S45 45
Other displays:
The defrost temperature cannot be displayed. There is stop based on time non
Defrost in progress / First cooling after defrost when temperature is still over
-d-
the thermostat band.
Password required. Set password PS
Regulation is stopped via main switch OFF
*) Emergency cooling will take eect when there is lack of signal from a dened S3 or S4 sensor. The regulation will continue with a registered average
cutin frequency. There are two registered values – one for day operation and one for night operation.
30 User Guide RS8GR602 © Danfoss 2016-10 AK-CT 450A
Fault message
In an error situation the LED’s on the display will ash and the alarm relay will be activated. If you push the top button in this situation you can see
the alarm report in the display.
There are two kinds of error reports - it can either be an alarm occurring during the daily operation, or there may be a defect in the installation.
A-alarms will not become visible until the set time delay has expired.
E-alarms, on the other hand, will become visible the moment the error occurs.
(An A alarm will not be visible as long as there is an active E alarm).
Here are the messages that may appear:
Code / Alarm text via data
communication
A1/--- High t.alarm
A2/--- Low t. alarm
A4/--- Door alarm
A5/--- Max hold time
A13/--- High temp S6
A14/--- Low temp S6
A15/--- DI1 alarm DI1 alarm 8
A16/--- DI2 alarm DI2 alarm 8
A45/--- Standby mode
A59/--- Case clean
A70/--- High temp S3B
A71/--- Low temp S3B
A72/--- High temp S6B
A73/--- Low temp S6B
E1/--- Ctrl. error Faults in the controller 32
E6/--- RTC error Check clock 32
E25/--- S3 error Error on S3 sensor 4
E26/--- S4 error Error on S4 sensor 4
E27/--- S5 error Error on S5 sensor 4
E28/--- S6 error Error on S6 sensor 4
E34/--- S3 error B Error on S3B sensor 4
E37/--- S5 error B
E38/--- S6 error B
E40/--- ID ModuleErr
E41/--- DO1 Fuse err.
E42........E48 / DO2....DO8
E52/--- DO2 Low Load Low power consumption on DO2. Check the load 128
E55/--- DO5 Low Load Low power consumption on DO5. Check the load 128
E56/--- DO6 Low Load Low power consumption on DO6. Check the load 128
E58/--- DO8 Low Load Low power consumption on DO8. Check the load 128
---/--- Max Def.Time Defrost stopped on time instead of temperature 16
Data communication
The importance of individual alarms can be dened with a setting. The setting must be carried out in the group "AKM Alarm destinations"
Settings from
System manager
High 1 X X X X
Middle 2 X X X
Low 3 X X X
Log only X
Disabled
Description Alarm relay groups
High temperature alarm
Low temperature alarm
Door alarm
The ”o16” function is activated during a coordinated defrost
Temperature alarm. High S6
Temperature alarm. Low S6
Standby position (stopped refrigeration via r12 or DI input)
Case cleaning. Signal from DI input
High temperature alarm, B section
Low temperature alarm, B-section
High temperature alarm, B section
Low temperature alarm, B-section
Error on S5B sensor
Error on S6B sensor
Incorrect communication with ID module
Excess current on DO1. Fuse has cut out
As above; fuse has cut out on the respective relay(s)
Settings from
AKM (Alarm destination)
Log Alarm relay Send via
Non High Low-High
Network
(P41)
1
2
8
16
1
2
-
-
1
2
1
2
4
4
1
128
128
AK-CT 450A User Guide RS8GR602 © Danfoss 2016-10 31
Operation
Display
The values will be shown with three digits, and with a setting
you can determine whether the temperature is to be shown in
°C or in °F.
Light-emitting diodes (LED) on front panel
The three lower bottom LEDs will light up when the relevant relay
is activated.
º
º = Refrigeration
º = Defrost
º = Fan running
The light-emitting diodes will ash when there is an alarm.
In this situation you can download the error code to
the display and cancel/sign for the alarm by giving the top
button a brief push.
The buttons
When you want to change a setting, the upper and the lower
buttons will give you a higher or lower value depending on the
button you are pushing. But before you change the value, you
must have access to the menu. You obtain this by pushing the
upper button for a couple of seconds - you will then enter the
column with parameter codes. Find the parameter code you
want to change and push the middle buttons until value for
the parameter is shown. When you have changed the value,
save the new value by once more pushing the middle button.
Examples
Set menu
1. Push the upper button until conguration access cFg is shown.
2. Push the upper or the lower button and nd that parameter you
want to change.
3. Push the middle button to enter the group.
4. Push the upper or the lower button and nd that parameter you
want to change.
5. Push the middle button until the parameter value is shown.
6. Push the upper or the lower button and select the new value
7. Push the middle button again to freeze the value.
Cutout alarm relay / receipt alarm/see alarm code
• A short press of the upper button
If there are several alarm codes they are found in a rolling stack.
Push the uppermost or lowermost button to scan
the rolling stack.
Set temperature
1. Push the middle button until the temperature value is shown.
2. Push the upper or the lower button and select the new value.
3. Push the middle button again to conclude the setting.
Reading the temperature at defrost sensor (Or product sensor,
if selected in o92.)
• A short press of the lower button.
Manuel start or stop of a defrost
• Push the lower button for four seconds.
Return to previous menu
1. Press the top or bottom button until ESc is shown.
2. Press the middle button.
32 User Guide RS8GR602 © Danfoss 2016-10 AK-CT 450A
Menu overview
Password
Temperatur PS cFg
in
out
buS b01 Modbus-kvalitet do2 S5 o03 Modbus address
r--
A-- do4 S3b ESc
c-- do5 S5b Retur
d-- do6 S6b
f-- do7 di1
L-- do8 di2
n-- do9 di3
o-- doA di4
P-- Ao1 di5
t-- di2 di6
u-- ESc
ESc
Close each group by pressing ESc
Conguration
➞
➞
➞
Menu groups
See also the following pages.
Return ESc
(Return)
do1
do3 S6 o04 Service pin (for LON only)
Service
Read output status. /
Override output when r12 = service (-1)
Return di8
Service
S3
S4 d10 Defrost sensor
Read input status
di7
Return
System settings
r12 Main switch
r89 Product type
Get a good start
With the following procedure you can start regulation
very quickly:
1 Basic settings entered by appliance manufacturer
2 Enter the system-dened settings as shown above
3 End with parameter r12 = 1 to start the regulation
(in a new and not previously set unit, r12 will already be set
to 0 which means stopped regulation.)
4 Send address to system unit:
• MODBUS: Activate scan function in system unit
• If another data communication card is used in the controller:
- LON RS485: Activate the function o04
Product type
Setting of pre-settings (r89).
After setting 1-5,
setting is returned to 0.
Product type =
Temperature (SP) 8°C 0°C -2°C -20°C -24°C
Max. temp. setting (r02) 10°C 4°C 2°C -16°C -20°C
Min. temp. setting (r03) 4°C -4°C -6°C -24°C -28°C
Upper alarm limit (A13) 14°C 8°C 8°C -15°C -15°C
Lower alarm limit (A14) 0°C -5°C -5°C -30°C -30°C
Can only be set when r12=0.
1
Vegetables
2
Meat/
Milk
sh4Frost5Ice
3
AK-CT 450A User Guide RS8GR602 © Danfoss 2016-10 33
Menu
Parameter El-diagram page 12 to 16
Function Code 1 2 3 4 5 6 7 8
Normal operation
Temperature (setpoint)
Thermostat r-
Dierential
Max. limitation of setpoint setting
Min. limitation of setpoint setting
Adjustment of temperature indication
Temperature unit (°C/°F)
Correction of the signal from S4
Correction of the signal from S3 and S3B
Manual service, stop regulation, start regulation (-1, 0, 1)
Displacement of reference during night operation
Dene thermostat function
1=ON/OFF, 2=Modulating
Denition and weighting, if applicable, of thermostat sensors S4% (100%=S4, 0%=S3)
Time between melt periods r16 1 1 1 1 1 1 1 1 0 hrs 10 hrs 1
Duration of melt periods
Temperature setting for thermostat band 2 . As dierential use
r01
Correction of the signal from S6
Correction of the signal from S6B r60 1 1 1 1 -10 K 10 K 0
Denition and weighting, if applicable, of thermostat sensors
when night cover is on. (100%=S4, 0%=S3)
Heat function
Neutral zone between refrigeration and heat function
Time delay at switch between refrigeration and heat function.
For setting = after 240 min. the heating function is deactivated
Product type: use settings listed in table. *** r89 1 1 1 1 1 1 1 1 0 5 0
Alarms A-
Delay for temperature alarm
Delay for door alarm
Delay for temperature alarm after defrost
High alarm limit for thermostat 1
Low alarm limit for thermostat 1
High alarm limit for thermostat 2
Low alarm limit for thermostat 2
High alarm limit for sensor S6 at thermostat 1
Low alarm limit for sensor S6 at thermostat 1
High alarm limit for sensor S6 at thermostat 2
Low alarm limit for sensor S6 at thermostat 2
S6 alarm time delay
With setting = 240 the S6 alarm will be omitted
Alarm time delay or signal on the DI1 input
Alarm time delay or signal on the DI2 input
Signal for alarm thermostat. S4% (100%=S4, 0%=S3)
Delay for S6 (product sensor alarm) after defrost
Delay for temperature alarm S3B
Compressor
Min. ON-time
Min. OFF-time
Time delay for cutin of comp.2
Defrost d-
Defrost method: 0=none, 1= EL, 2= Gas, 3=Brine, 4=Air d01 1 1 1 1 1 1 1 1 0/No 4/Air 1/EL
Defrost stop temperature
Interval between defrost starts
Max. defrost duration
*** - - - 1 1 1 1 1 1 1 1 -50°C 50°C 2
r01 1 1 1 1 1 1 1 1 0.1 K 20 K 2
r02 1 1 1 1 1 1 1 1 -49°C 50°C 50
r03 1 1 1 1 1 1 1 1 -50°C 49°C -50
r04 1 1 1 1 1 1 1 1 -10 10 0
r05 1 1 1 1 1 1 1 1 0/°C 1/F 0/°C
r09 1 1 1 1 1 1 1 1 -10 K 10 K 0
r10 1 1 1 1 1 1 1 1 -10 K 10 K 0
*** r12 1 1 1 1 1 1 1 1 -1 1 0
r13 1 1 1 1 1 1 1 1 -50 K 50 K 0
r14 1 1 1 1 1 1 1 1 1 2 1
r15 1 1 1 1 1 1 1 1 0 % 100 % 100
r17 1 1 1 1 1 1 1 1 0 min. 30 min. 5
*** r21 1 1 1 1 1 1 1 1 -50°C 50°C 2
r59 1 1 1 1 1 1 1 1 -10 K 10 K 0
r61 1 1 1 1 1 1 1 1 0 % 100 % 100
r62 1 1 1 1 1 1 1 1 0 K 50 K 5
r63 1 1 1 1 1 1 1 1 0 min. 240 min. 240
A03 1 1 1 1 1 1 1 1 0 min. 240 min. 30
A04 1 1 1 1 1 1 1 1 0 min. 240 min. 60
A12 1 1 1 1 1 1 1 1 0 min. 240 min. 90
A13 1 1 1 1 1 1 1 1 -50°C 50°C 8
A14 1 1 1 1 1 1 1 1 -50°C 50°C -30
A20 1 1 1 1 1 1 1 1 -50°C 50°C 8
A21 1 1 1 1 1 1 1 1 -50°C 50°C -30
A22 1 1 1 1 1 1 1 1 -50°C 50°C 8
A23 1 1 1 1 1 1 1 1 -50°C 50°C -30
A24 1 1 1 1 1 1 1 1 -50°C 50°C 8
A25 1 1 1 1 1 1 1 1 -50°C 50°C -30
A26 1 1 1 1 1 1 1 1 0 min. 240 min. 240
A27 1 1 1 1 1 1 1 1 0 min. 240 min. 30
A28 1 1 1 1 1 1 1 1 0 min. 240 min. 30
A36 1 1 1 1 1 1 1 1 0 % 100 % 100
A52 1 1 1 1 1 1 1 1 0 min. 240 min. 90
A53 1 1 1 1 0 min. 240 min. 90
c-
c01 1 1 1 1 1 1 1 0 min. 30 min. 0
c02 1 1 1 1 1 1 1 0 min. 30 min. 0
c05 1 0 sec 999 sec 5
d02 1 1 1 1 1 1 1 1 0°C 50°C 6
d03 1 1 1 1 1 1 1 1 0 hrs/O 240 hrs 8
d04 1 1 1 1 1 1 1 1 0 min. 360 min. 45
Min.value
Max.value
Factory
setting
SW = 1.8x
Actual
setting
34 User Guide RS8GR602 © Danfoss 2016-10 AK-CT 450A
Continued Code 1 2 3 4 5 6 7 8 Min. Max. Fac. Actual
Displacement of time on cutin of defrost at start-up d05 1 1 1 1 1 1 1 1 0 min. 240 min. 0
Drip o time d06 1 1 1 1 1 1 1 1 0 min. 60 min. 0
Delay for fan start after defrost d07 1 1 1 1 1 1 1 1 0 min. 60 min. 0
Fan start temperature d08 1 1 1 1 1 1 1 1 -50 °C 0 °C -5
Fan cutin during defrost
0: Stopped
1: Running
2: Running during pump down and defrost
Defrost sensor: 0 =Stop on time, 1=S5, 2=S4, 3=S5 og S5B) d10 1 1 1 1 1 1 1 1 0 3 0
Pump down delay d16 1 1 1 1 1 1 1 1 0 min. 60 min. 0
Drain delay (used at hot gas defrost only) d17 1 0 min. 60 min. 0
Max. aggregate refrigeration time between two defrosts d18 1 1 1 1 1 1 1 1 0 hrs 48 hrs 0/OFF
Heat in drip tray. Time from defrosting stops to heating in the
drip tray is switched o
Number of permissible extended defrost cycles before an alarm
is issued
Rail heat during defrost cycle:
0=inactive, 1=continues as set, 2=100% on
Fan F-
Fan stop temperature (S5) F04 1 1 1 1 1 1 1 1 -50°C 50°C 50
Pulse operation on fans: 0=No pulse operation, 1=At thermostat
cuts out only, 2= Only at thermostat cut outs during night
operation
Period time for fan pulsation (on-time + o-time) F06 1 1 1 1 1 1 1 1 1 min. 30 min. 5
On-time in % of period time F07 1 1 1 1 1 1 1 1 0 % 100 % 100
Max. permissible S4 temperature during defrost cycle. If the value
is exceeded, the fans will stop. (Setting = 15 = no function)
Electricity monitoring L-
Current measured electricity through relay 1 (DO1) L11 1 1 1 1 1 1 1 1 Ampere
Same for relays 2 to 8 L12-
Fuse status for relay 1/Forced control of relay 1./ Reconnection L21 1 1 1 1 1 1 1 1 0/o 1/on 1/on
Same for relays 2 to 8 L22-
Electrical current value at which relay cuts out; 0 = not used
Recommended setting = measured consumption + 25%
Same for relays 2 to 8 L32-
Current measured voltage in phase L1 L51 1 1 1 1 1 1 1 1 V
Current measured voltage in phase L2 L52 1 1 1 1 1 1 1 1 V
Current measured voltage in phase L3 L53 1 1 1 1 1 1 1 1 V
Alarm limit for low consumption on DO2 L62 1 1 1 1 1 1 1 0 A 10 A 1
Alarm limit for low consumption on DO5 L65 1 1 1 1 0 A 10 A 1
Alarm limit for low consumption on DO6 L66 1 1 1 1 1 1 1 1 0 A 10 A 0
Alarm limit for low consumption on DO8 L68 1 1 1 1 0 A 10 A 1
Parameters for refrigeration function
Period time for the pulse width period (PWM) n63 1 1 1 1 1 1 1 1 30 sec. 900 sec. 300
Max. opening degree at PWM n64 1 1 1 1 1 1 1 1 10% 100% 100
Min. opening degree at PWM n65 1 1 1 1 1 1 1 1 0% 90% 0
Expert setting. Windup at PWM n66 1 1 1 1 1 1 1 1 0.2 1.0 1.0
Expert setting. Kp at PWM n67 1 1 1 1 1 1 1 1 0.5 10.0 4.0
Expert setting. Tn at PWM n68 1 1 1 1 1 1 1 1 60 sec 1800 sec 300
Miscellaneous o-
Delay of output signals after start-up o01 1 1 1 1 1 1 1 1 0 sec 600 sec 5
Input signal on DI1. Function:
0=not used. 1=status on DI1. 2=door function with alarm when
open. 3=door alarm when open. 4=defrost start (pulse-signal).
5=ext.main switch. 6=night operation 7=thermostat band
changeover (activate r21). 8=alarm function when closed.
9=alarm function when open. 10=case cleaning (pulse signal).
11=forced cooling at hot gas defrost, 12=night cover. . 13=not
used. 14=forced close. 15=appliance shutdown. 16=light.
17=extra light. 18=cancel defrost. 19=override light.
Network address o03 1 1 1 1 1 1 1 1 0 240 0
On/O switch (Service Pin message)
IMPORTANT! o61 must be set prior to o04
(used at LON 485 only)
Access code 1 (all settings) o05 1 1 1 1 1 1 1 1 0 100 0
Used sensor type : 0=Pt1000, 1=Ptc1000, o06 1 1 1 1 1 1 1 1 0/Pt 1/Ptc 0/Pt
d09 1 1 1 1 1 1 1 1 0 2 1
d20 1 0 min. 240 min. 30
d26 1 1 1 1 1 1 1 1 1 10 1
d27 1 1 1 1 1 1 1 1 0 2 2
F05 1 1 1 1 1 1 1 1 0 2 0
F22 1 1 1 1 1 1 1 1 -15°C 15°C 15
1 1 1 1 1 1 1 1 Ampere
L18
1 1 1 1 1 1 1 1 0/o 1/on 1/on
L28
L31 1 1 1 1 1 1 1 1 0 /4A 16 A 16
1 1 1 1 1 1 1 1 0 /4A 16 A 16
L38
n-
o02 1 1 1 1 1 1 1 1 0 19 0
o04 1 1 1 1 1 1 1 1 0/O 1/On 0/O
AK-CT 450A User Guide RS8GR602 © Danfoss 2016-10 35
Continued Code 1 2 3 4 5 6 7 8 Min. Max. Fac. Actual
Max hold time after coordinated defrost o16 1 1 1 1 1 1 1 1 0 min. 360 min. 20
Select signal for display view. S4% (100%=S4, 0%=S3) o17 1 1 1 1 1 1 1 1 0 % 100 % 100
Input signal on DI2. Function:
0=not used. 1=status on DI2. 2=door function with alarm
when open. 3=door alarm when open. 4=defrost start
(pulse signal). 5=ext. main switch. 6=night operation
7=thermostat band changeover (activate r21). 8=alarm function
when closed. 9=alarm function when open. 10=case cleaning
(pulse signal). 11=forced cooling at hot gas defrost, 12=night
cover.13=coordinated defrost). 14=forced close. 15=appliance
shutdown. 16=light. 17=extra light. 18=cancel defrost.
19=override light.
Conguration of light function: 1=Light follows day/night operation, 2=Light control via data communication via ‘o39’, 3=Light
control with a DI-input, 4=As with “2”, but light switch on and
night cover will open if the network cuts out for more than
15 minutes. 5=Light goes on when a signal is received from both
DI and central signal (DI7 or data communication). 6=Like “5”,
but light also goes on for manual activation of night blind.
Activation of light relay (only if o38=2, 5 or 6)
Rail heat On time during day operations
Rail heat On time during night operations
Rail heat period time (On time + O time)
Case cleaning. 0=no case cleaning. 1=Fans only. 2=All output O.
Select application. See overview page 13 to 16 * o61 1 1 1 1 1 1 1 1 1 8 1
Access code 2 (partial access) *** o64 1 1 1 1 1 1 1 1 0 100 0
Replace the controllers factory settings with the present settings
Input signal on DI3. Function:
(0=not used. 1=status on DI3. 2=door function with alarm when
open. 3=door alarm when open. 4=defrost start (pulse-signal).
5=ext. main switch 6=night operation, 7=thermostat band
changeover (activate r21). 8=Not used. 9=Not used. 10=case
cleaning (pulse signal). 11=forced cooling at hot gas defrost,
12=night cover. 13=Not used. 14=Refrigeration stopped (forced
closing). 15=appliance shutdown. 16=light. 17=extra light.
18=cancel defrost. 19=override light.
Rail heat control
0=not used, 1=pulse control with timer function (o41 and o42),
2=pulse control with dew point function
Dew point value where the rail heat is minimum
Dew point value where the rail heat is 100% on
Lowest permitted rail heat eect in %
Time delay from "open door” refrigeration is started
Fan operation on stopped refrigeration (forced closing):
0: The fans will be stopped and defrosting will be permitted.
1: The fans will run and defrosting will be permitted.
2: The fans will be stopped and defrosting will not be permitted.
3: The fans will run and defrosting will not be permitted.
Denition of readings on lower button:
1=defrost stop temperature, 2=S6 product temperature,
Display of temperature
1= u56 Air temperature
2= u36 product temperature
Light and night blinds dened
0: Light is switch o and night blind is open when the main
switch is o
1: Light and night blind is independent of main switch
Conguration of alarm relay
The alarm relay will be activated upon an alarm signal from
the following groups:
1 - High temperature alarms
2 - Low temperature alarms
4 - Sensor error
8 - Digital input enabled for alarm
16 - Defrosting alarms
32 - Miscellaneous
64 - Injection alarms
128 - Fuse cut out
The groups that are to activate the alarm relay must be set by
using a numerical value which is the sum of the groups that
must be activated.
(E.g.: a value of 5 will activate all high temperature alarms and
all sensor error.
Input signal on DI4. Switch signal. See DI3 above P55
o37 1 1 1 1 1 1 1 1 0 19 0
o38 1 1 1 1 1 1 1 1 1 6 1
o39 1 1 1 1 1 1 1 1 0/O 1/On 0/O
o41 1 1 1 1 1 1 1 1 0 % 100 % 100
o42 1 1 1 1 1 1 1 1 0 % 100 % 100
o43 1 1 1 1 1 1 1 1 1 min. 60 min. 10
*** o46 1 1 1 1 1 1 1 1 0 2 0
o67 1 1 1 1 1 1 1 1 0/O 1/On 0/O
o84 1 1 1 1 1 1 1 1 0 19 0
o85 1 1 1 1 1 1 1 1 0 2 0
o86 1 1 1 1 1 1 1 1 -10°C 50°C 8
o87 1 1 1 1 1 1 1 1 -9°C 50°C 17
o88 1 1 1 1 1 1 1 1 0 % 100 % 30
o89 1 1 1 1 1 1 1 1 0 min. 240 min. 30
o90 1 1 1 1 1 1 1 1 0 3 1
o92 1 1 1 1 1 1 1 1 1 2 1
o97 1 1 1 1 1 1 1 1 1 2 1
o98 1 1 1 1 1 1 1 1 0 1 0
P41
1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1
0 255 239
0 19 0
36 User Guide RS8GR602 © Danfoss 2016-10 AK-CT 450A
Continued Code 1 2 3 4 5 6 7 8 Min. Max. Fac. Actual
Input signal on DI5. Contact switch. See DI3 above P56
Input signal on DI6. Contact switch. See DI3 above P57
Input signal on DI7. High voltage signal. See DI3 above P58
Input signal on DI8. High voltage signal. See DI3 above P59
Max. opening time of night blind following manual override
with DI activation.
Erase all current controller settings on ID module. P61
Conguration of night blind relay. On= night blind used P64
Stop time for fan while night blind rolls down P65
Max. on time for light and night blind following manual
DI activation
Real time clock t-
Six start times for defrost.
Setting of hours.
0=OFF
Six start times for defrost.
Setting of minutes.
0=OFF
Clock - Setting of hours t07 1 1 1 1 1 1 1 1 0 hrs 23 hrs 0
Clock - Setting of minute t08 1 1 1 1 1 1 1 1 0 min. 59 min. 0
Clock - Setting of date t45 1 1 1 1 1 1 1 1 1 day 31 day 1
Clock - Setting of month t46 1 1 1 1 1 1 1 1 1 mon. 12 mon. 1
Clock - Setting of year t47 1 1 1 1 1 1 1 1 0 year 99 year 0
Service u-
Temperature measured with S5 sensor
Status on DI1 input. on/1=closed
Actual defrost time (minutes)
Temperature measured with S3 sensor
Status on night operation (on or o) 1=on
Temperature measured with S4 sensor
Thermostat temperature
Run time of thermostat (cooling time) in minutes
Opening degree of EVR valve ** u23 1 1 1 1 1 1 1 1
Temperature measured with S6 sensor
(product temperature)
Status on DI2 input. on/1=closed
Air temperature . Weighted S3 and S4
Measured temperature for alarm thermostat
Status on relay for cooling
Status on relay for fan
Status on relay for defrost
Status on relay for rail heat
Status on relay for alarm
Status on relay for light
Status on relay for hot gas valve
Status on relay for compressor 2
Temperature measured with S5B sensor u75 1 1 1 1 1 1 1 1
Temperature measured with S3B sensor u76 1 1 1 1
Temperature measured with S6B sensor u79 1 1 1 1
Status on relay for hot gas valve / drain valve ** u80 1
Status on relay for heating element in drip tray ** u81 1
Status on relay for night blinds ** u82 1 1 1 1 1
Status on relay for defrost 2 ** u83 1 1 1
Readout of the actual rail heat eect
1: Thermostat 1 operating, 2: Thermostat 2 operating
Status on DI3 input. on/1=closed u87 1 1 1 1 1 1 1 1
Readout of thermostats actual cut in value
Readout of thermostats actual cut out value
Measured temperature for alarm thermostat in section B U34 1 1 1 1
Air temperature in section B U35 1 1 1 1
Status of relay for light 2 ** U36 1 1 1 1 1 1
** u58 1 1 1 1 1 1 1
** u59 1 1 1 1 1 1 1 1
** u60 1 1 1 1 1 1 1
** u61 1 1 1 1 1 1 1 1
** u62 1 1 1 1 1 1 1 1
** u63 1 1 1 1 1 1 1 1
** u64 1
** u67 1
1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1
P60
1 1 1 1 1
1 1 1 1 1 1 1 1
1 1 1 1 1
1 1 1 1 1
P66
1 1 1 1 1 1 1 1
t01 -
1 1 1 1 1 1 1 1 0 hrs 23 hrs 0
t06
t11 -
1 1 1 1 1 1 1 1 0 min. 59 min. 0
t16
u09 1 1 1 1 1 1 1 1
u10 1 1 1 1 1 1 1 1
u11 1 1 1 1 1 1 1 1
u12 1 1 1 1 1 1 1 1
u13 1 1 1 1 1 1 1 1
u16 1 1 1 1 1 1 1 1
u17 1 1 1 1 1 1 1 1
u18 1 1 1 1 1 1 1 1
u36 1 1 1 1 1 1 1 1
u37 1 1 1 1 1 1 1 1
u56 1 1 1 1 1 1 1 1
u57 1 1 1 1 1 1 1 1
u85 1 1 1 1 1 1 1 1
u86 1 1 1 1 1 1 1 1
u90 1 1 1 1 1 1 1 1
u91 1 1 1 1 1 1 1 1
0 19 0
0 19 0
0 19 0
0 19 0
0 min. 60 min. 5
0 / o 1 / on 0 / o
0 / o 1 / on 1 / on
0 sec 300 sec 60
0 min. 60 min. 30
AK-CT 450A User Guide RS8GR602 © Danfoss 2016-10 37
Continued Code 1 2 3 4 5 6 7 8 Min. Max. Fac. Actual
Status of relay for ECO fan ** U37 1 1 1
Status of relay for defrost 3 ** U38 1 1 1 1
Status of DI4 input. On=closed U39 1 1 1 1 1 1 1 1
Status of DI5 input. On=closed U40 1 1 1 1 1 1 1 1
Status of DI6 input. On=closed U41 1 1 1 1 1 1 1 1
Status of high-voltage input DI7, 230 V = 1 = closed U42 1 1 1 1 1 1 1 1
Status of high voltage input DI8, 230 V = 1 = closed U43 1 1 1 1 1 1 1 1
0-10 V output indicates EVR valve’s degree of opening ** U44 1 1 1 1 1 1 1 1
Modbus communication status, 0% = none; 100% = everything
ok
Read usage of DI2 signal: 0 = see status in u37; 1 = output for
coordinated defrost
Status of relay to drain valve: 1 = drawn ** U55 1
*) Can only be set when regulation is stopped (r12=0)
**) Can be controlled manually, but only when r12=-1
***) With access code 2 the access to these menus will be limited
Factory setting
Follow these steps if you need to return to the factory-set values:
- Connect a display with control buttons to the controller
- Activate setting P61 to reset the ID module
- Disconnect the supply voltage to the controller
- Remove the ID module from the controller
- Hold in the top and bottom buttons on the display while reconnecting the supply voltage
- Disconnect the supply voltage to the controller
- Insert the ID module into the controller
- Connect the supply voltage to the controller
U45 1 1 1 1 1 1 1 1
** U54 1 1 1 1 1 1 1 1
38 User Guide RS8GR602 © Danfoss 2016-10 AK-CT 450A
Ordering
Type Function Code no.
AK-CT 200A
AK-CT 450A
EKA 163B External display with plug for direct connection 084B8574
EKA 164B
EKA 175
Controller tray for controlling refrigeration appliance.
With MODBUS data communication
ID module with code for controlling thermostatic controlled
expansion valve.
External display with operation buttons and plug for
direct connections
Cable with plug for display unit (24 pcs.)
0.3 m
2 m
3 m
6 m
9 m
Console for mounting display on wall 084B8584
Data communication module
LON RS 485
084B0040, (1 pc.)
084B0070, (6 pcs.)
084B0042, (1 pcs.)
084B0072, (60 pcs.)
084B8575
084B7500
084B7179
084B7099
084B7097
084B7630
084B8579
AK-CT 450A User Guide RS8GR602 © Danfoss 2016-10 39
Data
Supply voltage
Main switch Automated fuse, 4 terminals, 16 A, SIL-approved
Sensor S2 Not used
Sensor S3, S3B,
S4, S5, S5B, S6,
S6B
Accuracy
Display 2 plugs for connecting external display
External display EKA 163B or 164B
Digital inputs
DI1, DI2, DI3,
DI4, DI5, DI6
Digital inputs
DI7, DI8
Electrical connection cable
Relays
Solid state
output
Analogue
voltage outlet
Environments
Enclosure IP 20
Weight 3.8 kg
Data
communication
Power reserve
for the clock
Approvals
*) Gold plating ensures make function with small contact loads.
400 V 3N a.c. / 400 V 2N a.c. / 230 V N a.c.
+10/-15%, 30 VA, 50 Hz
Pt 1000 or
PTC 1000 ohm / 25°C
(All must be of the same type)
Measuring range -60 to +120°C
±1 K below -35°C
Controller
± 0,5 K between -35 to +25°C;
±1 K above +25°C
Pt 1000 sensor
I-reading
L11 - L18
±0,3 K at 0°C
±0,005 K per degree
0-10 A: +/- 15%
min. +/- 1A
Signal from contact functions
Requirements to contacts: None
Cable length must be max. 15 m
Use auxiliary relays when the cable is longer
230 V a.c.
On: DI > 80 V a.c.
O: DI < 24 V a.c.
Max. 2.5 mm2
Max. 16 A (12) A
DO1-DO8
I max: (adjustable 4-16 A)
I max. = 0 = cut out cancelled
Alarm relay 4 (3) A. Min. 100 mA*
Max. 240 V half wave rectied
Max. 0.5 A
DOA (for coil)
Leakage < 1 mA
Max. 1 coil
Electronic coil controller EEC may
not be used
AO1
0-10 V
R
Load
> 1 kΩ
0 to +55°C, During operations
-40 to +70°C, During transport
20 - 80% Rh, not condensed
No shock inuence / vibrations
Fixed MODBUS
Extension options LON RS485
24 hours
EU Low Voltage Directive and EMC demands re
CE-marking complied with
LVD-tested acc. EN 60730-1, EN 60730-2-1 and
EN 60730-2-9
EMC-tested acc. EN 61000-6-2 and EN 61000-6-3
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already on order provided that such alternations can be made without subsequential changes being necessary in specications already agreed.
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40 User Guide RS8GR602 © Danfoss 2016-10 AK-CT 450A
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