AK-CT
450A
User
Guide RS8GR602 © Danfoss 2016-10
17
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 defined function is active when the input is closed/opened.
DI7-DI8
Digital input signal.
The defined 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 = B-
Terminal 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
(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 compo-
nents, damaged as a result of the above defects. It is the installer's
responsibility to check the installation thoroughly, and to fit the
necessary safety devices.
Special reference is made to the necessity of signals to the
controller when the compressor is stopped and to the need of
liquid receivers before the compressors.
Your local Danfoss agent will be pleased to assist with further
advice, etc.
Connections
Supply voltage
230 V, or 2 neutral, or 3 neutral. 50 Hz.
Neutral
must
be fitted. 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
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
rectified.
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 configuration)
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
