AK-CT 450A User Guide RS8GR602 © Danfoss 2016-10 25
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.
o03
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)
o04
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).
o05 Acc. code
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.
o06 SensorCong
Pt = 0
PTC = 1
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.
o16 Max HoldTime
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.
o17 Disp. 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 refrig-
eration 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)
o37 DI2 cong.
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