Survey Of Functions - Danfoss EKD 316 Manual

Manual Superheat controller type EKD 316

Survey of functions

Function
Normal display
The superheat is normally shown.
The opening degree is displayed during manual operation or if the valve is under
analogue control.
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 switch to Fahrenheit,
either as absolute values or as delta.
The combination of temperature unit and pressure unit is depicted to the right.
Correction of signal from S2
(Compensation possibility through long sensor cable).
Correction of signal from S4
(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.
Alarm
If there is an alarm, the LEDs on the front of the external display will flash if it is con-
nected. The alarm relay in the controller is closed.
Battery alarm
Here it is defined whether the controller is to monitor the voltage from the battery
backup. If there is low voltage, or no voltage, an alarm will be given
Control parameters
Valve definition
0 = ETS 12½, ETS 25, KVS 15
5 = user-defined
1 = ETS 50, CCM 10, CCM 20, CCM 30
6 = Saginomiya UKV/SKV/VKV/PKV;
2 = ETS 100, CCM 40
7 = ETS 6
3 = ETS 250, KVS 42
8 = CCMT 2, CCMT 4, CCMT 8
4 = ETS 400
On using external display EKA 164A, please check page 9 section ETS valve
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.
D: Differentiation time Td
The D-setting can be cancelled by setting the value to min. (0).
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
Note:
If no MOP function is required, select pos. Off. (A value of 200 corresponds to Off )
Startup time for safety signal
If the controller does not obtain a reliable signal within this period of time the con-
troller will try to establish a stable signal in other ways. (A value that is too high may
result in a flooded evaporator).
The value should only be changed by specially-trained staff .
Signal safety during startup
The control function uses the value as a start value for the valve's opening degree at
each thermostat cut-in. By adaptive control the controller continuously calculates a
new value.
The value should only be changed by specially-trained staff.
Stability factor for regulation of superheat
With a higher value, the control function will allow a greater fluctuation of the super-
heat before the reference is changed. The value should only be changed by specially-
trained staff.
18 DKRCC.PS.RP0.A1.02/520H7142
Para- Parameter by operation via
meter data communication
SH/OD%
Miscellaneous
Units (Menu = Misc.)
r05 0: °C + bar
1: °F + psig
r09 Adjust S2
r10 Adjust S4
r12 Main Switch
Alarm setting
A34 Batt. alarm
Injection control
n03 Valve type
n04 Kp factor
n05 Tn sec.
n06 Td sec.
n09 Max SH
n10 Min SH
n11 MOP (bar)
n15 StartUp time
n17 Start OD%
n18 Stability
©Danfoss A/S (AC-MCI / sw), 2014-03
Manual Superheat controller type EKD 316
Survey and function (continued)
Damping of amplification near reference value
This setting damps the normal amplification Kp, but only just around the reference
value. A setting of 0.5 will reduce the KP value by half.
The value should only be changed by specially-trained staff.
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
startup, the value must be raised slightly. If there is pendling during start-up, the
value must be reduced slightly.
The value should only be changed by specially-trained staff.
Definition of superheat regulation (Ref. section "Operation")
1: Lowest permissible superheat (MSS). Adaptive regulation.
2: Load-defined superheat. The reference is established based on the line formed by
the three points: n09, n10 and n22.
Value of min. superheat reference for loads under 10%
(The value must be smaller than "n10").
Max. opening degree
The valve's opening degree can be limited. The value is set in %.
Number of steps from 0% to 100% open (User-defined valve, n03 =5)
(Automatic setting when valve is selected in n03).
Spindle stroke speed (number of steps per second)
(Automatic setting when valve is selected in n03).
Integration time for the inner loop gain
Used only when o56 = 2
The value should only be changed by specially-trained staff.
Miscellaneous
Address/data communication
The controller must always have an address. The factory-set address is 240.
When an external display is connected, the display itself will find the address of the
controller so that communication can take place.
Note:
A display and a system unit must not be connected at the same time.
The display will not be able to communicate in this situation.
If the controller is to be part of a network with other controllers and a system unit, the
controller's address must be within the range 1 to 200.
This address must EITHER be set via a display before it is connected to the data com-
munication and a scan of the network is performed
OR the network is connected and a scan is performed. The address is then set after-
wards. A new scan is performed so that the new address is known.
Requirements for the installation and data communication cable are discussed in the
separate document no. "RC8AC".
Application mode
1: The controller receives signals from another controller and must control the valve's
opening degree.
2: Superheat regulation.
Input signal for external control of the valve's opening degree
Only used if o61 is set to 1.
Definition of the signal's range.
0: No signal
1: 0-20 mA
2: 4-20 mA
3: 0-10 V
4: 1-5 V
(At the lower value the valve will be closed. At the upper value the value will be fully
open. There is a linear relationship between the signal and the opening degree. The
height of the valve is not taken into account.)
©Danfoss A/S (AC-MCI / sw), 2014-03 DKRCC.PS.RP0.A1.02/520H7142
n19 Kp Min
n20 Kp T0
n21 SH mode
n22 SH Close
n32 ETS OD% Max
n37 Max. steps (100 to 6000 step)
n38 Steps/sec (5 to 300 step/sec)
n44 TnT0 sec
Miscellaneous
The controller can be operated via the
system unit and AK service tool.
It cannot be operated via AKM type
system software.
o03 Unit addr.
The address is set between 0 and 200.
(When the address is set, the system
the system unit's scan function should
be activated)
o61 Appl. mode
o10 AI type
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