Danfoss AK-CC 210B User guide
User Guide
Controller for temperature control
AK-CC 210B, SW 1.0x
ADAP-KOOL® Refrigeration Control System
www.danfoss.com
User Guide | Controller for temperature control AK-CC 210B, SW 1.0x
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Contents
Introduction .........................................................................................................2
Operation ..............................................................................................................3
Applications .........................................................................................................6
Survey of functions ............................................................................................8
Operation ........................................................................................................... 17
Menu survey ...................................................................................................... 18
Ordering ............................................................................................................. 20
Connections ...................................................................................................... 21
Data ...................................................................................................................... 22
Introduction
Application
The AK-CC 210B is dedicated for “plug-in cabinets” in supermarkets.
Principle
The AK-CC 210B controls the temperature in the cabinet based on
the measurement from a single sensor – Sair.
This sensor can be placed in the cold airflow after the evaporator
or in the warm airflow before the evaporator, depending on the
construction and usage of the cabinet.
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Sair
A measurement of the defrost temperature can be obtained
directly through the use of an S5 sensor or indirectly through the
use of the Sair measurement.
Relays: the first 3 relays are dedicated for Refrigeration, Defrost
and Light, respectively. The usage of relay 4 is selected by the
application setting, and can be Alarm, Fan, Rail heat, Condenser
fan or Compressor 2.
The different applications are described on page 6.
Advantages
• Many applications in the same unit
• The controller has integrated refrigeration-technical functions, so
that it can replace a whole collection of thermostats and timers
• Buttons and seal imbedded in the front
• Alarm monitoring of condenser temperature with compressor
stop protection.
• Sealed relays for use with R290 refrigerants
• Can control two compressors
• Easy to remount data communication
• Quick set-up
• Two temperature references
• Digital inputs for various functions
• Clock function with super cap back-up
• Factory calibration that will guarantee a better measuring
accuracy than stated in the standard EN ISO 23953-2 without
subsequent calibration (Pt 1000 ohm sensor)
Sair
S
air
S
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S
Sair
Sair
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User Guide | Controller for temperature control AK-CC 210B, SW 1.0x
Tc - Condenser temp.
timet1 t2 t3 t4 t5 t6
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ompressor run enabled
time
Operation
Operation - Sensors
One thermostat sensor – Sair – can be connected to the controller,
and the relevant application defines the placement.
It can be placed in the air before the evaporator or in the airflow
after the evaporator. The latter is mainly used where there is a risk
of too low temperature at the products.
Sair
Sair
Defrost sensor
The best signal concerning the evaporator’s temperature
is obtained from a defrost sensor mounted directly on the
evaporator. Here the signal may be used by the defrost function,
so that the shortest and most energy-saving defrost can take
place.
If a defrost sensor is not required, defrost can be stopped based on
time, or Sair can be selected.
Condenser temperature sensor
A condenser temperature sensor – Sc – can be used for monitoring
the temperature on the condenser. Depending on settings, alarms
can be generated and other actions, including safety stop of
compressor, can be initiated based on this temperature.
Condenser temperature alarms and actions
An alarm warning can be activated when the temperature gets
above a set Condenser Alarm limit and a critical alarm can be
activated at a higher Condenser Block Alarm limit. At this critical
level, different actions can be initiated e.g. turning off the light
in the cabinet, turning off the compressor, or both. The wanted
action is defined by parameter "P92".
Compressors can be permanently stopped if a defined number of
critical alarms occur within a defined time period. If the number
of events exceeds the setting in parameter "P94" within a period
defined in "P93", the last event will always include a compressor
stop, together with other actions defined in "P92".
This state requires a manual reset before the compressor can start
again.
Condenser Block Alarm (A54)
Condenser
Alarm (A37)
Di.
(A78)
Delay
(A55)
S5
Sc
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2x Di. (A78)
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Time Period (P93)
Events in period (P94)12345
Manual reset
C
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User Guide | Controller for temperature control AK-CC 210B, SW 1.0x
Control of two compressors
This control is used for controlling two compressors of the same
size. The principle for control is that one of the compressors
connects at ½ the differential of the thermostat, and the other at
the full differential. When the thermostat cuts in, the compressor
with the fewest operating hours is started. The other compressor
will only start after a set time delay, so that the load will be divided
between them. The time delay has a higher priority than the
temperature.
When the air temperature has dropped by half the differential, one
of the compressors will stop, while the other will continue working
and not stop until the required temperature is achieved.
The compressors used must be of a type that is capable of starting
up against a high pressure.
Change of temperature reference
In an impulse appliance, for example, used for various product
groups the temperature reference is changed easily with a contact
signal on a digital input. The signal changes the normal thermostat
setpoint by a predefined value. At the same time the high and low
alarm limits will be displaced with the same value.
Night setback
The thermostat reference can be displayed with an offset at night.
The alarm limit value will be changed with the same value as the
night offset. The change will only be applied for positive night
offset.
Digital inputs
There are two digital inputs, both of which can be used for the
following functions:
- Case cleaning
- Door contact function with alarm
- Starting a defrost
- Coordinated defrost (DO2 only)
- Night setback
- Change-over between two temperature reference
- Report state of digital input via data communication
Case cleaning function
This function makes it easy to steer the refrigeration appliance
through a cleaning phase. Via three pushes on a switch you
change from one phase to the next phase.
The first push stops the refrigeration – the fans keep working.
”Later”: The next push stops the fans
”Still later”: The next push restarts refrigeration
The different situations can be followed on the display.
On the network, a cleaning alarm is transmitted to the system unit.
This alarm can be ”logged” so that proof of the sequence of events
is provided.
- + + °C
1 ÷ + Fan
2 ÷ ÷ Off
3 + + °C
Door contact function
In cold rooms and frost rooms the door switch can switch the light
on and off, start and stop the refrigeration and give alarm if the
door has remained open for too long.
Defrost
Depending on the application, you may choose between the
following defrost methods:
Natural: Here the fans are kept operating during defrost
Electric: The heating element is activated
Hot gas: The defrost output is used to control a solenoid that lets
the hot gas flow through the evaporator. The compressor
is kept running to generate hot gas.
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User Guide | Controller for temperature control AK-CC 210B, SW 1.0x
Start of defrost
A defrost can be started in different ways:
Interval: Defrost is started at fixed time intervals,
e.g. every eighth hour
Refrigeration
time: Defrost is started at fixed refrigeration time
intervals. In other words, a low need for
refrigeration will ”postpone” the coming defrost.
Schedule: Here defrost can be started at fixed 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.
S5 temp In 1:1 systems the efficiency of the evaporator can
be followed. Icing-up will start a defrost.
Manual: An extra defrost can be activated from the
controller’s lower-most button.
(Though not for application 4).
All the mentioned methods can be used at random – if just one of
them is activated a defrost will be started.
Coordinated defrost
There are two ways in which coordinated defrost can be arranged.
Either with wire connections between the controllers or via data
communication.
Max. 15
Wire connections
One of the controllers is defined to be the controlling unit and
a battery module may be fitted in it so that the clock is ensured
back-up. When a defrost is started, 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.
(If just one in the group demands defrost, the others will follow
suit).
Defrost via data communication
All controllers are fitted with a data communication module,
and via the override function from a gateway the defrost can be
coordinated.
Defrost on demand
1. Based on refrigeration time
When the aggregate refrigeration time has passed a set time, a
defrost will be started.
2. Based on temperature
The controller will constantly follow the temperature at S5.
Between two defrosts, the S5 temperature will become lower
the more the evaporator ices up (the compressor operates for a
longer time and pulls the S5 temperature further down). When
the temperature passes a set allowed variation, the defrost will
be started.
This function can only work in 1:1 systems.
Service request alarm
The controller will register the accumulated on-time in days, and a
limit can be set to activate a “service request alarm” to indicate that
inspection and cleaning of the fan and condenser is imminent.
After doing so, the Runtime counter can be reset and a new period
initiated.
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User Guide | Controller for temperature control AK-CC 210B, SW 1.0x
Extra module
• The controller can afterwards be fitted with an insertion module
if the application requires it.
The controller has been prepared with plug, so the module
simply has to be pushed in.
- Battery module
The module guarantees voltage to the controller if the supply
voltage should drop out for more than four hours. The clock
function can thus be protected during a power failure.
- Data communication
If you require operation from a PC, a data communication
module has to be placed in the controller.
• External display
If it is necessary to indicate the temperature on the front of
the refrigeration appliance, a display type EKA 163A can be
mounted. The extra display will show the same information as
the controller's display, but does not incorporate buttons for
operation. If operation from the external display is needed a
display type EKA 164A must be mounted.
Applications
AK-CC 210B is developed for refrigerated plug-in cabinets with
one or 2 compressors.
3 sensors can be connected; Sair, S5 (Defrost termination), and Sc
(Condenser temperature).
The first 3 relays are used for compressor on-off, defrost, and light
while relay 4 is configurable via “o61” application setting. The relay
can be configured for 5 different applications:
1. Alarm relay
2. Evaporator fan control
3. Rail Heat Control
4. Condenser fan control
5. Second compressor control
DI1, and DI2 are flexible Dry Contact inputs that can be configured
for multiple functions via “o02” or “o37” (see settings page 12-13).
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User Guide | Controller for temperature control AK-CC 210B, SW 1.0x
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Sair
S5 Sc DI1DI2
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Sair
S5 Sc
DI1DI2
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Sair
S5 Sc
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Sair
S5 Sc
DI1DI2
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Sair
S5 Sc
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Application dependent connections
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1
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2
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4
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1
2
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230 V
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