Configuration; Di Input Configuration; Alarm Codes; Control Status - Danfoss EKC 223 User Manual

Case controller, type EKC 223 and EKC 224

Configuration

DI input configuration

The digital inputs DI1 and DI2 can be configured for multiple functions and the table below shows the options and
the polarity of the digital input signals.
Table 7: DI input configuration
Function Description
DI Status Only a status of the digital input.
When door is opened, cooling and fan is stopped but they will
Door function
resume when the door alarm delay expires.
When door is opened, cooling and fan is stopped and they will
Door alarm
not resume operation when the door alarm delay expires.
Main switch Used for starting and stopping control.
Night setback Used to put controller into night mode.
Reference offset Used to add a reference offset to the thermostat setpoint.
External alarm Used to generate alarm from an external signal.
Defrost start Used to initiate a defrost cycle (toggle switch).
Pulldown cycle Used to initiate a temperature pull down cycle (toggle switch).
A Sc condenser sensor is used to monitor the condensing tem-
Sc sensor
perature.

Alarm codes

In an alarm situation the display will alternate between readout of the actual air temperature and readout of the
alarm codes of active alarms. There are two kinds of alarms - 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.
Here are the messages that may appear:
Table 8: Alarm codes
Code Alarms
E29 Sair sensor error
E27 Def sensor error
E30 Sc sensor error
A01 High temp alarm
A02 Low temp alarm
A99 High Volt alarm
AA1 Low Volt alarm
A61 Condenser alarm
A80 Cond. block alarm
A04 Door alarm
A15 DI Alarm
A45 Standby Alarm
(1) (1)
The condenser block alarm can be reset by setting r12 Main switch OFF and ON again or by powering down the controller. The condenser block alarm can be reset by setting r12 Main switch OFF and ON again or by powering down the controller.

Control status

The controller has a special control status parameter which tells what the controller is doing. This parameter can be
readout in the display as parameter "u00 Control state" and this can provide valuable information to a service
technician to understand what the controller is doing.
© Danfoss | Climate Solutions | 2023.05
Description
Air temperature sensor is defect or electrical connection is lost
S5 Evaporator sensor is defect or electrical connection is lost
Sc Condenser sensor is defect or electrical connection is lost
Air temperature in cabinet is too high
Air temperature in cabinet is too low
Supply voltage is too high (compressor protection)
Supply voltage is too low (compressor protection)
Condenser temp. too high - check air flow
Condenser temp. too high - manual reset of alarm required
Door has been open for too long
External alarm from DI input
Control has been stopped by "r12 Main switch"
Polarity
Closed = ON
Open = OFF
Closed = Door is closed
Open = Door is open
Closed = Door is closed
Open = Door is open
Closed = Normal control
Open = Stop control
Closed = Night mode
Open = Day mode
Closed= Reference is offset
Open = No offset
Closed = No alarm
Open = Alarm
From open to closed:
Defrost cycle is started
From open to closed:
Pulldown cycle is started
Not applicable
(1)
BC432222569027en-000201 | 18
DI1 DI2
Value
o02 o37
* * 1
* * 2
* * 3
* * 4
* * 5
* * 6
* * 7
* * 8
* * 9
* 10
Network alarm
--- Sair Error
--- S5 Error
--- Sc Error
--- High t.alarm
--- Low t. Alarm
--- High Voltage
--- Low Voltage
--- Cond Alarm
--- Cond Blocked
--- Door alarm
--- DI Alarm
--- Standby mode