© Danfoss A/S (DCS-IMCGPD/sw), 2015-03
DKRCC.PS.R1.A3.02 / 520H9752
5
Manual
Electronic superheat controller, type EKC 312
Function
Parameter Parameter by operation via data communication
Normal display
Normally the superheat is shown (but the valve’s opening degree or
air temperature may also be selected. See o17.
SH / OD% / S4 temp
Reference
Thermostat control
Unit
Here you select whether the controller is to indicate the
temperature values in °C or in °F.
And pressure values in bar or psig.
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.
r05
Units (Menu=Misc.)
0: °C + bar
1: °F + psig
(in AKM only °C + bar – is displayed – whatever the
setting)
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.
r12
Main Switch
Alarm
Alarm setting
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.
Control parameters
Injection control
P: Amplification factor Kp
If the Kp value is reduced the regulation becomes slower.
n04
Kp factor
I: Integration time Tn
If the Tn value is increased the regulation becomes slower.
n05
Tn sec.
Max. value for the superheat reference
n09
Max SH
Min. value for the superheat reference
Warning! Due to the risk of liquid flow the setting should not be
lower than approx. 2-4 K.
n10
Min SH
MOP
If no MOP function is required, select pos. Off.
n11
MOP (bar)
(A value of 20 corresponds to Off )
Amplification factor for the superheat
This setting determines the valve’s opening degree as a function of
the change in evaporating pressure. An increase of the evaporating
pressure will result in a reduced opening degree. When there is a
drop-out on the low-pressure thermostat during start-up the value
must be raised a bit. If there is pendling during start-up the value
must be reduced a little.
The value should only be changed by specially trained staff.
n20
Kp T0
Value of min. superheat reference for loads under 10%
(The value must be smaller than ”n10”).
n22
SH Close
The parameters ”n37” and ”n38” are settings for step motor ETS 100.
The settings must be changed when another valve is used.
Number of steps from 0% to 100% open
n37
Max. steps (0 - 5000 step)
Spindle stroke speed (number of steps per second)
n38
Steps / sec (10 - 300 step/sec)
Integration time for the inner loop gain
Used only when o56=2.
The value should only be changed by specially trained staff.
n44
TnT0 sec
Survey of functions