Danfoss EKD 316, Manual, Page: 11 / 12

Survey and function (continued)
Manual control of outputs
For service purposes the ETS-output and alarm relay outputs can be forced
However, only when regulation has been stopped.
OFF: No override
1: Manual control via o45 is enabled
2: The alarm relay releases so that there is a connection between 24 and 25 (= alarm)
3: The alarm relay picks up so that there is a connection between 25 and 26 (= no alarm)
o18 Manual ctrl
Manual control of the ETS valve
The valve‘s opening degree can be set manually.
However, it does require "o18" to be set to "1", "2" or "3".
This function must only be used for manual operation. It must not be used for external
control.
o45 Manual ETS OD%
Working range for pressure transmitter
Depending on the application, a pressure transmitter with a given working range is
used.
For the range of (-1 to 12 bar), the min. value is set to -1 bar.
o20 MinTransPres.
For the range of (-1 to 12 bar), the max. value is set to 12 bar. o21 MaxTransPres.
Selection of control algorithm
Depending on the application, control can be carried out based on different param-
eters.
The two possibilities are shown in section "Type of regulation".
1=normal control (single loop)
2=with inner loop regulation and S4 temperature less T0 (double loop)
Note:
* After o56 is changed, the controller must be switched off and powered up again.
o56 Reg. type *
Refrigerant setting
Before refrigeration can be started, the refrigerant must be defined. You can select the
following refrigerants:
o30 Refrigerant
1 = R12
2 = R22
3 = R134a
4 = R502
5 = R717
6 = R13
7 = R13b1
8 = R23
9 = R500
10 = R503
11 = R114
12 = R142b
13 = User-defined
14 = R32
15 = R227
16 = R401
17 = R507
18 = R402A
19 = R404A
20 = R407C
21 = R407A
22 = R407B
23 = R410A
24 = R170
25 = R290
26 = R600
27 = R600a
28 = R744
29 = R1270
30 = R417A
31 = R422A
32 = R413A
33 = R422D
34 = 427A
35 = R438A
R36 = Opteon XP10
37 = R407F
( Warning : Incorrect selection of refrigerant may cause damage to the compressor).
Service Service
A number of controller values can be printed for use in a service situation
Read value of external current signal/voltage signal (Ext.Ref.)
u06 Analogue input
Read status of input DI (start/stop input) u10 DI
Read the temperature at the S2 sensor u20 S2 temp.
Read superheat u21 SH
Read the control’s actual superheat reference u22 SH ref.
Read the valve’s opening degree u24 OD%
Read evaporating pressure u25 Evap. pres. P
e
Read evaporating temperature u26 Evap.Press.T
e
Read the temperature at the S4 sensor u27 S4 temp.
-- DO1 Alarm
Read status of alarm relay
Operating status
The controller’s operating status can be called forth by a brief (1s) activation of the
upper button. If a status code exists, it will be shown. (Status codes have lower priority
than alarm codes. This means that status codes cannot be seen if there is an active
alarm code.
The individual status codes have the following meanings:
EKC State
(0 = regulation)
S10: Refrigeration stopped by the internal or external start/stop. 10
Appendix II
©Danfoss A/S (AC-MCI / sw), 2014-03 DKRCC.PS.RP0.A1.02/520H7142 21 20 DKRCC.PS.RP0.A1.02/520H7142 ©Danfoss A/S (AC-MCI / sw), 2014-03
Manual Superheat controller type EKD 316 Manual Superheat controller type EKD 316
General information to MODBUS
communication via a PLC etc.
* Baudrate : 19200
* EKD Address : 240
* Polarity A-A and B-B
* Termination with 120 ohm resistor
Some parameters have what is called a "config lock". This means
that they can only be changed when the main switch of the EKD
is set to OFF (r12 = 0). This applies for instance to the type of
refrigerant (o30). So if you want to change the refrigerant, the
main switch (r12) must first be set to 0, then the refrigerant type
(o30) can be changed.
The following parameters require the main switch to be OFF:
n03 Valve type
n37 Max steps
n38 Max steps/sec
o03 Unit address
o30 Refrigerant
o56 Regulation type
o61 Application mode
Please refer to the manual for descriptions of these parameters.
It should be possible to change all other parameters while the unit
is running (regulation parameters etc.).
Example:
EKD 316 as simple ETS valve driver function with the following
settings:
ƒ
PNU 117 [0] r12 Main switch = 0
ƒ
PNU 2075 [1] o18 Manual mode
ƒ
PNU 2064 [OD% ] o45 Manual ETS OD% (replace 0-10V signal)
ƒ
PNU 3032 [262] n37 Max. steps 2620
ƒ
PNU 3033 [250] n38 Steps pr. sec 250
ƒ
EKD 316 address : 240
ƒ
PNU 2064 will go back to 0% at power off as the only one