Digital Input - Danfoss EKC 414A Manual

Introduction
Application
The controller is a complete control unit for refrigeration appli-
ances with integrated refrigeration-technical functions capable of
replacing a setup of thermostats and timers.
The relays are used for operating:
- Compressor
- Fan
- defrost
- Alarm
- Light
The controller can operate one evaporator.
The intended placing of the controller is "on/near the refrigeration
appliance" and the controller is therefore provided with plugs at
the sensor connection points. All sensors used must therefore be
fitted with a belonging plug.
Operation
The controller comes without operating buttons on the front
panel, and it will require no operation once it has been set and
started up.
When the controller is operated, it can be done in one of the fol-
lowing ways:
• Connection of an external display with operating buttons
- The display will currently show measurements and settings in
the menu system
- In case of malfunction the relevant error code will be shown on
the display
- Four light-emitting diodes will show the system's actual func-
tion:
› refrigeration
› power for the AKV valve
› defrost
› fan operating
› when there is an alarm the three LED's will flash
• Data communication
The controller can be hooked up with other products in the
series of ADAP-KOOL® refrigeration controls. The operation,
monitoring and data collection can then be performed from a
PC – either on site or at a service company.
Customer display
If the temperature in the appliance is to be visible to, say, custom-
ers, a display can be mounted.
2 Manual RS8CK502 © Danfoss 05-2005
Inject ON function
The expansion valve closes when the signal at the 230V input is
removed or receives a signal via the data communication. In this
way it is ensured that the expansion valve will not charge the
evaporator when the compressor has stopped.
(The threading of the function may be cancelled via a setting).

Digital input

A digital input can be defined for one of the following applica-
tions:
Door alarm
Defrost start
Night operation
Start/stop of regulation
Joint defrost start/stop with a master/slave function
Data communication
The controller is provided with LON RS 485 data communication.
More about this data communication on page 18.
EKC 414A