Survey Of Functions - Danfoss EKC 312 User Manual

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
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.
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.
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.
Control parameters
P: Amplification factor Kp
If the Kp value is reduced the regulation becomes slower.
I: Integration time Tn
If the Tn value is increased the regulation becomes slower.
Max. value for the superheat reference
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.
MOP
If no MOP function is required, select pos. 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.
Value of min. superheat reference for loads under 10%
(The value must be smaller than "n10").
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
Spindle stroke speed (number of steps per second)
Integration time for the inner loop gain
Used only when o56=2.
The value should only be changed by specially trained staff.
© Danfoss A/S (DCS-IMCGPD/sw), 2015-03
Electronic superheat controller, type EKC 312
DKRCC.PS.R1.A3.02 / 520H9752
Parameter Parameter by operation via data communication
SH / OD% / S4 temp
Thermostat control
Units (Menu=Misc.)
0: °C + bar
r05 1: °F + psig
(in AKM only °C + bar – is displayed – whatever the
setting)
r12 Main Switch
Alarm setting
Injection control
n04 Kp factor
n05 Tn sec.
n09 Max SH
n10 Min SH
MOP (bar)
n11
(A value of 20 corresponds to Off )
n20 Kp T0
n22 SH Close
n37 Max. steps (0 - 5000 step)
n38 Steps / sec (10 - 300 step/sec)
n44 TnT0 sec
5