Survey Of Functions - Danfoss EKC 315A User Manual

Survey of functions

Function
Normal display
Normally the superheat is shown (but the valve's opening degree or air temperature
may also be selected. See o17).
Reference
Se point
Regulation is performed based on the set value provided that there is no external
contribution (o10).
(Push both buttons simultaneously to set the setpoint).
Differential
When the temperature is higher than the reference plus the set differential, the sole-
noid valve's relay will be activated. It will become deactivated when the temperature
drops below the set reference.
Unit
Here you select whether the controller is to indicate the temperature values in °C or
in °F. If indication in °F is selected, other temperature settings will also change over to
Fahrenheit, either as absolute values or as delta values
The combination of temperature unit and pressure unit is depicted to the right.
External contribution to the reference
This setting determines how large a contribution is to be added to the set setpoint
when the input signal is max. (20 mA). See o10.
Correction of signal from S2
(Compensation possibility through long sensor cable).
Correction of signal from S3
(Compensation possibility through long sensor cable).
Start/stop of refrigeration
With this setting refrigeration can be started and stopped. Start/stop of refrigeration
can also be accomplished with the external switch function. See also appendix 1.
Define thermostat function
0: No thermostat function. Only the superheat is regulated
1: Thermostat function as well as regulation of superheat.
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.
Alarm for upper deviation
The alarm for too high S3 temperature is set here. The value is set in Kelvin. The alarm
becomes active when the S3 temperature exceeds the actual reference plus A01. (The
actual reference can be seen in u28).
Alarm for lower deviation
The alarm for too low S3 temperature is set here. The value is set in Kelvin. The alarm
becomes active when the S3 temperature drops below the actual reference minus
A02.
Alarm delay
If one of the two limit values is exceeded, a timer function will commence. The alarm
will not become active until the set time delay has been passed. The time delay is set
in minutes.
4
Ref.
Manual RS8CS302 © Danfoss 07-2005
Para-
meter
-
r01
Diff.
r05
r06
r09
r10
r12
r14
A01
A02
A03
Parameter by operation via
data communication
SH / OD% / S3 temp
TempSetpoint.
Differential
Units
0: °C + bar
1: °F + psig
(in AKM only °C + bar – is displayed
– whatever the setting).
ExtRefOffset
Adjust S2
Adjust S3
Main Switch
Therm. Mode
Hgh.TempAlrm
Low.TempAlrm
TempAlrmDel
With data communication the impor-
tance of the individual alarms can be
defined. Setting is carried out in the
"Alarm destinations" menu. See also
page 14
EKC 315A