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
Polarity
DI1
DI2
Value
o02
o37
DI Status
Only a status of the digital input.
Closed = ON
Open = OFF
*
*
1
Door function
When door is opened, cooling and fan is stopped but they will
resume when the door alarm delay expires.
Closed = Door is closed
Open = Door is open
*
*
2
Door alarm
When door is opened, cooling and fan is stopped and they will
not resume operation when the door alarm delay expires.
Closed = Door is closed
Open = Door is open
*
*
3
Main switch
Used for starting and stopping control.
Closed = Normal control
Open = Stop control
*
*
4
Night setback
Used to put controller into night mode.
Closed = Night mode
Open = Day mode
*
*
5
Reference offset
Used to add a reference offset to the thermostat setpoint.
Closed= Reference is offset
Open = No offset
*
*
6
External alarm
Used to generate alarm from an external signal.
Closed = No alarm
Open = Alarm
*
*
7
Defrost start
Used to initiate a defrost cycle (toggle switch).
From open to closed:
Defrost cycle is started
*
*
8
Pulldown cycle
Used to initiate a temperature pull down cycle (toggle switch). From open to closed:
Pulldown cycle is started
*
*
9
Sc sensor
A Sc condenser sensor is used to monitor the condensing tem-
perature.
Not applicable
*
10
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
Description
Network alarm
E29
Sair sensor error
Air temperature sensor is defect or electrical connection is lost
--- Sair Error
E27
Def sensor error
S5 Evaporator sensor is defect or electrical connection is lost
--- S5 Error
E30
Sc sensor error
Sc Condenser sensor is defect or electrical connection is lost
--- Sc Error
A01
High temp alarm
Air temperature in cabinet is too high
--- High t.alarm
A02
Low temp alarm
Air temperature in cabinet is too low
--- Low t. Alarm
A99
High Volt alarm
Supply voltage is too high (compressor protection)
--- High Voltage
AA1
Low Volt alarm
Supply voltage is too low (compressor protection)
--- Low Voltage
A61
Condenser alarm
Condenser temp. too high - check air flow
--- Cond Alarm
A80
Cond. block alarm
Condenser temp. too high - manual reset of alarm required
(1)
--- Cond Blocked
A04
Door alarm
Door has been open for too long
--- Door alarm
A15
DI Alarm
External alarm from DI input
--- DI Alarm
A45
Standby Alarm
Control has been stopped by "r12 Main switch"
--- Standby mode
(1)
The condenser block alarm can be reset by setting r12 Main switch OFF and ON again or by powering down the controller.
(1)
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.
Case controller, type EKC 223 and EKC 224
© Danfoss | Climate Solutions | 2023.05
BC432222569027en-000201 | 18