Functions - Danfoss EKC 202 Manual

Functions

Here is a description of the individual functions.
A controller only contains this part of the functions. Cf. the menu survey.
Function
Normal display
Normally the temperature value from thermostat sensor Sair is displayed.
Thermostat
Set point
Regulation is based on the set value plus a displacement, if applicable. The value is set via a push
on the centre button.
The set value can be locked or limited to a range with the settings in r02 and r 03.
The reference at any time can be seen in "u28 Temp. ref"
Differential
When the temperature is higher than the reference + the set differential, the compressor relay
will be cut in. It will cut out again when the temperature comes down to the set reference.
Setpoint limitation
The controller's setting range for the setpoint may be narrowed down, so that much too high or
much too low values are not set accidentally - with resulting damages.
To avoid a too high setting of the setpoint, the max. allowable reference value must be lowered.
To avoid a too low setting of the setpoint, the min. allowable reference value must be increased.
Correction of the display's temperature showing
If the temperature at the products and the temperature received by the controller are not identi-
cal, an offset adjustment of the shown display temperature can be carried out.
Temperature unit
Set here if the controller is to show temperature values in °C or in °F.
Correction of signal from Sair
Compensation possibility through long sensor cable
Start / stop of refrigeration
With this setting refrigeration can be started, stopped or a manual override of the outputs can
be allowed.
Start / stop of refrigeration can also be accomplished with the external switch function con-
nected to the DI input.
Stopped refrigeration will give a "Standby alarm".
Night setback value
The thermostat's reference will be the setpoint plus this value when the controller changes over
to night operation. (Select a negative value if there is to be cold accumulation.)
Activation of reference displacement
When the function is changed to ON the thermostat differential will be increased by the value in
r40. Activation can also take place via input DI (defined in o02).
Value of reference displacement
The thermostat reference and the alarm values are shifted the following number of degrees
when the displacement is activated. Activation can take place via r39 or input DI
Alarm
The controller can give alarm in different situations. When there is an alarm all the light-emitting
diodes (LED) will flash on the controller front panel, and the alarm relay will cut in.
8
Ref. Dif.
Manual RS8DZ602 © Danfoss 08-2010
Para- Parameter by operation via data com-
meter munication
Display air (u69)
Thermostat control
Cutout °C
r01 Differential
r02 Max cutout °C
r03 Min cutout °C
r04 Disp. Adj. K
r05 Temp. unit
°C=0. / °F=1
(Only °C on AKM, whatever the setting)
r09 Adjust Sair
r12 Main Switch
1: Start
0: Stop
-1: Manual control of outputs allowed
r13 Night offset
r39 Th. offset
r40 Th. offset K
Night setbck
(start of night signal)
Alarm settings
With data communication the importance
of the individual alarms can be defined.
Setting is carried out in the "Alarm destina-
tions" menu.
EKC 202