Data sheet
Superheat Controller
Type EKD 316 and EKD 316C
EKD 316 / EKD 316C is a superheat controller for the stepper motor valve that can be used where there are requirements for accurate control of superheat in connection with refrigeration.
The controller and valve can be used where there are requirements for accurate control of superheat in connection with refrigeration.
Applications:
• Processing plant (water chillers)
• Cold store (air coolers)
• A/C plant
• Heat pumps
• Air conditioning
Benefits |
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The superheat is regulated to the lowest |
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possible value. |
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• The evaporator is charged optimally – even |
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when there are great variations of load and |
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suction pressure. |
Main features |
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Regulation of superheat |
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MOP function |
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• ON/OFF input for start/stop of regulation |
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• Relay output to alarm |
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•Energy savings – the adaptive regulation of the refrigerant injection ensures optimum utilisation of the evaporator and thus a high suction pressure.
•MOD bus communication
•Safety features and
•Alarm indications
© Danfoss | DCS (sw) | 2016.11 |
DKRCC.PD.RR0.B2.02 | 1 |
Data sheet | Superheat controller type EKD 316, EKD 316C
Contents |
Pages |
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Applications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
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. 3 |
Function overview.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 |
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Data.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 |
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Ordering. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
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. 4 |
Dimensions.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 |
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Accessories. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
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. 4 |
Related products.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 |
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Connections.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 |
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Configuration.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 |
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Parallel Evaporators with common suction line.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 |
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Data communication.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 |
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Installation.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 |
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Installation sensors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
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10 |
Start of controller. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
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11 |
Settings and checks to be made before start.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
11 |
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Stepper motor valve type.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
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Operation.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 |
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Types of regulation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
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14 |
Manually operating the valve. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
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Finding the optimum settings.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
16 |
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If the superheat fluctuates.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
16 |
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Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
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Alarms.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 |
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Appendix I. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
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18 |
-Menu survey EKD 316.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 - 19
-Survey of functions.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 - 21 - 22 Appendix II.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
- General information to MODBUS communication via a PLC etc. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 - EKD 316 – Parameter identification (modbus).. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 - EKD 316C – Parameter identification (modbus).. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 - 26 - Installation considerations.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 List of literature.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Acronyms and abbreviations used in this manual:
LOC |
Loss of charge indication |
SH |
Superheat |
MOP |
Maximum operating pressure |
MSS |
Minimum stable superheat |
PNU |
Parameter number |
Te |
Saturated suction temperature |
Pe |
Evaporator pressure |
S2 |
Evaporator temperature |
S4 |
Evaporator outlet temperature |
OD |
Opening degree |
EEV |
Electronic expansion valve |
∆Tm |
Temperature difference between media temperature and evaporating temperature |
© Danfoss | DCS (sw) | 2016.11 |
DKRCC.PD.RR0.B2.02 | 2 |
Data sheet | Superheat controller type EKD 316, EKD 316C
Applications
The following gives an idea of the application scope of the EKD 316 / EKD 316C controller.
Water chiller using direct expansion
The most common application is water chillers using direct expansion. The regulation can be single loop using an AKS 32R pressure transmitter to measure evaporator pressure and an S2 sensor to measure superheated gas. If double loop regulation is used, the S4 sensor should be located at the water outlet pipe to measure the leaving water temperature. It is recommended to start with factory settings.
The application diagram shows the use of EKD 316 as a superheat controller, where temperature sensor AKS 21A and pressure transmitter AKS 32R have been shown as an example.
Function overview
Minimum Stable Superheat (MSS)
The controller will search for the minimum stable superheat between an upper and lower boundry. If the superheat has been stable for a period, the superheat reference is decreased. If the superheat becomes unstable, the reference is raised again. This process continues as long as the superheat is within the bounds set by the user. The purpose of this is to search for the lowest possible superheat that can be obtained while still maintaining a stable system. The superheat reference can also be fixed, in which case this function is disabled.
Maximum Operating Pressure (MOP)
In order to reduce the strain of the compressor, a maximum operating pressure can be set. If the pressure comes above this limit, the controller will control the valve to provide a lower pressure instead of a low superheat. The limit for this function is usually a fixed pressure, but it is possible to offset the limit temporarily.
Stand-alone function
EKD 316 / EKD 316C is designed to operate in conjunction with a system master controller, which will control the EKD 316 /
EKD 316C via MODBUS or analog signal. It is however possible to use it in a standalone mode using one temperature and one pressure transducer.
Manual Control as a valve driver
The valve can be controlled manually by setting the desired operating degree using MODBUS. Alternatively, the controller may also be started and stopped externally using the analog signal 4 to 20 mA/0 to 10 V DC, /1 to 5 V DC.
Forced opening during startup
In some applications it is necessary to open the valve quickly when the compressor turns on to prevent suction pressure becoming too low. This is ensured by setting a fixed opening degree and
a startup time for the controller. Note that this will give a fixed opening degree for the duration of the start time, regardless of the superheat value.
Relay
The relay for the alarm function is an alternating relay. In the event of an alarm, the relay will close, which may, for instance, be used for an alarm buzzer.
© Danfoss | DCS (sw) | 2016.11 |
DKRCC.PD.RR0.B2.02 | 3 |
Data sheet | Superheat controller type EKD 316, EKD 316C
Data
Compatible valves |
ETS / CCM / CCMT 0 - 42 / CTR / ETS 6 / |
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EKD 316 C |
ETS C / KVS C |
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Compatible valves |
ETS / CCM / CCMT 0 - 42 / CTR / ETS 6 |
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EKD 316 |
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ETS / KVS / CCM / CCMT 2 - CCMT 8 |
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24 V AC / DC ±15% 50/60 Hz, 10 VA / 5 Watt |
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Supply voltage |
ETS 6 / CCMT 16 - CCMT 42: |
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24 V AC / DC ±15% 50/60 Hz, 15 VA / 8 Watt |
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(the supply voltage is not galvanically |
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separated from the input and output signals) |
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Power consumption |
Controller |
5 VA |
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ETS step motor |
1.3 VA |
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Input signal |
Current signal * |
4 - 20 mA or 0 - 20 mA |
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Voltage signal * |
0 - 10 V or 1 - 5 V |
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*)Ri: mA: 400 ohm |
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Pressure transmitter |
AKS 32R |
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V: 50 kohm |
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Digital input from external contact function |
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Sensor input |
2 pcs. Pt 1000 ohm |
DI : < 800 ohm = ON |
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DI : > 30 kohm = OFF |
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Alarm relay |
1 pcs. SPDT, |
Max 24V, 1A resistive - Class II |
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Step motor output |
EKD 316 : Switching 30 - 300 mA RMS |
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EKD 316C : Switching 30 - 600 mA RMS |
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Data communication |
RS 485 Modbus data communication |
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0 to +55°C, during operations |
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Environments |
-40 to +70°C, during transport |
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20 - 80% Rh, not condensed |
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No shock influence/vibrations |
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Enclosure |
IP 20 |
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Weight |
300 g |
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Montage |
DIN rail |
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Operation |
External display type EKA 164A or AK-ST via data |
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communication and system unit |
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EU Low Voltage Directive and EMC demands re. CE- |
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marking complied with. |
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Approvals |
LVD-tested acc. to EN 60730-1 and EN 60730-2-9 |
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EMC-tested acc. to EN50081-1 and EN 50082-2 |
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Battery backup |
If battery backup is used, the requirements for the |
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battery are: 18 - 24 V DC See also page 12. |
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Max. distance between |
30 m |
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controller and valve |
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Ordering
Type |
Function |
Code no. |
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EKD 316C |
Superheat controller |
084B8045 |
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(with terminals) |
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EKD 316 |
Superheat controller |
084B8040 |
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(with terminals) |
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External display |
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EKA 164A |
(with MODBUS communication) |
084B8563 |
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For technical details please see |
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literature reference on last page. |
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EKA 183A |
Programming key |
084B8582 |
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Dimensions [mm]
Related products
Pressure transducer |
Temperature sensor |
External display |
Programming key |
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AKS 32R, NSK |
AKS 21, AKS 11 |
EKA 164A |
EKA 183A |
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© Danfoss | DCS (sw) | 2016.11 |
DKRCC.PD.RR0.B2.02 | 4 |
Data sheet | Superheat controller type EKD 316, EKD 316C
Connections
Necessary connections
Terminals:
1-2 |
Supply voltage 24 V AC / DC |
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3-4 |
Battery (the voltage will close the ETS valve if the |
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controller losses its supply voltage). |
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The battery voltage must not be connected from terminals 1 |
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and 2. |
5-8 |
Supply to stepper motor |
9-13 |
Operation via data communication |
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EITHER EKA 164A OR System unit + software. |
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It is important that the installation of the data communication |
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cable be done correctly. |
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For further information on data communication: see literature |
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list page 23 |
20-21 |
Switch function for start/stop of regulation. |
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Note: |
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If a switch is not connected, terminals 20 and 21 must be short |
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circuited. |
Application-dependent connections
Superheat control
14-15 Pt 1000 sensor at evaporator outlet (S2)
15-16 Pt 1000 sensor for measuring air temperature (S4)
17-19 Pressure transmitter type AKS 32R
Note:
The signal can not be shared with other controllers
Control of the valves opening degree with analog signal
21-22 Current signal or voltage signal from other regulation (Ext. Ref.)
24-26 Alarm relay
There is connection between 24 and 26 in alarm situations.
Warning
Any external connection with grounding could create a ground loop through a diode in the rectifier bridge which could destroy the power supply in EKD 316 / EKD 316C.
1,2 3,4 21,22
Connection to earth will destroy the controller
A dedicated transformer must be used.
<![endif]>Danfoss 84B3201.10
24V 18V
Class II
Connections EKD 316
ETS / KVS / CCMT2 -
CCMT42 / CCM / CTR
White |
5 |
Black |
6 |
Red |
7 |
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Green |
8 |
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Connections EKD 316 /
Connections EKD 316 C
ETS 6 / CCMT 0 - CCMT 1
Orange |
5 |
Yellow |
6 |
Red |
7 |
Black |
8 |
Connections EKD 316 C
ETS C / KVD C / ETS / KVS
/CCMT2 - CCMT42 / CCM
/CTR
White |
5 |
Black |
6 |
Red |
7 |
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Green |
8 |
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© Danfoss | DCS (sw) | 2016.11 |
DKRCC.PD.RR0.B2.02 | 5 |
Data sheet | Superheat controller type EKD 316, EKD 316C
Configuration
Independent superheat regulation
The superheat in the evaporator is controlled by one pressure transmitter P and one temperature sensor S2. This can be done setting o61 = 2.
Fitting the "S4" temperature sensor is optional, but the regulation is improved by an "inner loop control" when the sensor is fitted.
Valve driver (Via Analog Signal)
This is where the controller receives signals from another controller, after which it controls the valve’s opening degree. The signal can either be a current signal or a voltage signal.
The valve can be any of the stepper motor valves listed on “valve overview”.
Details can be found on the section “valve overview”.
I/V
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Application Mode – superheat regulation |
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Selection of normal control mode |
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Function |
Parameter |
Value |
Application Mode – superheat regulation |
o61 |
2 |
Selection of inner loop control mode |
056 |
2 |
We recommend this inner loop control application mode setting, if the superheating is to be regulated with precision. Here the S4 and T0 temperature are part of an inner loop control.
The regulation algorithms require that a temperature sensor be fitted in the chilled medium.
The temperature sensor is connected to input "S4" and mounted in the chilled medium after the evaporator. (Danfoss calls a sensor S4 when it is mounted in the refrigerant after the evaporator).
External start/stop of regulation
The controller can be started and stopped externally via a contact function connected to input terminals 20 and 21. Regulation is stopped when the connection is interrupted. The function must be used when the compressor is stopped. The controller then closes the ETS valve so that the evaporator is not charged with refrigerant.
Battery
For safety reasons the liquid flow to the evaporator must be cut off if there is a power failure to the controller. As the ETS valve is provided with a stepper motor, it will remain open in such a
situation. When mounting the battery backup, the valve will close in the event of a power cut.
I/V |
<![if ! IE]> <![endif]>Danoss 84B2966.12 |
|
OD
<![if ! IE]><![endif]>Danfoss84B2707.10
I/V
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Parameter |
Value |
Function |
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o61 |
1 |
Application Mode - control via analog signal |
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Relays
The relay for the alarm function is an alternating relay.
In the event of an alarm the relay will close to connect terminals 24 and 26. This can, for instance, be used for an alarm buzzer. When there is no alarm or the controller is off, terminals 24 and 25 are connected.
© Danfoss | DCS (sw) | 2016.11 |
DKRCC.PD.RR0.B2.02 | 6 |
Data sheet | Superheat controller type EKD 316, EKD 316C
Parallel Evaporators with common suction line
Since the introduction of EEV, it has been observed the phenomena the so-called Sleeping Evaporators phenomena have been observed. This happens when the outlet of the evaporators has a common suction line.
This is seen when using the Adaptive superheat Mode in some of the controllers. What happens is that by controlling using the same superheat reference in both controllers, evaporator No. 1 might be controlling in the correct manner, but the EEV for evaporator No. 2 might be closed.
However, the measured superheat of controller No. 2 will be the same as No. 1 because both S2 sensors will measure the same temperature.
In other words, the open degree of the EEV integrates down to 0% but, the measured superheat complies with the reference valve.
One solution is to use the Load-defined superheat Mode in the controller because the measured superheat governs the opening degree of the connected EEV.
© Danfoss | DCS (sw) | 2016.11 |
DKRCC.PD.RR0.B2.02 | 7 |
Data sheet | Superheat controller type EKD 316, EKD 316C
Data communication
Data communication with the EKD 316 is possible using one of the following two ways:
•1. Via External display (EKA 164A)
•2. Via standard MODBUS Device
Via external display (EKA 164A)
Use an external display to operate the controller. This must be done as follows:
<![if ! IE]><![endif]>84B3082.10
<![if ! IE]><![endif]>Danfoss
EKD 316
Note:
Max. distance between controller and display is 30 m.
The supply voltage to the display must be maintained at 12 V +/- 15%.
The values are shown in three digits, and with a setting you can determine whether the temperature is shown in °C or in °F. (Pressure in bar or psig.)
In order to change a setting, the upper and lower buttons will give you a higher or lower value depending on the button you are pushing. But before you change the value, you must have access to the menu. You obtain this by pushing the upper button for a couple of seconds – you will then enter the column with parameter codes. Find the parameter code you want to change and push the middle button until the value for the parameter is shown. When you have changed the value, save the new value by pushing once more on the middle button.
By pushing the middle button you go directly to the Main Switch setting (r12).
Example
Set a menu
1.Push the upper button until a parameter is shown
2.Push the upper or the lower button and find the parameter you want to change
3.Push the middle button and the value is shown
4.Push the upper or the lower button and select the new value
5.Push the middle button again to conclude the setting
Via standard MODBUS device
Communication direct to MODBUS RTU protocol.
There are 3 different MODBUS baud rates available, which are 9,600 baud, 19,200 baud and 38,400 baud.
The default MODBUS baud rate is 19,200 baud.
A scan is performed once the EKD 316 / EKD 316C controller is connected to the network. This will auto detect the baud rate used by the master and will automatically adjust to its setting. This process usually take a few seconds.
The only available fixed communication settings are 8 data bit, EVEN parity and 1 stop bit.
The default unit address is 240 which, can be changed using parameter "03 unit address".
EKD 316 can be operated from a PC that has AK-ST software loaded.
System unit
Communication from a third party controller or monitoring system
Settings and values can be read from the EKD 316 / EKD 316C via MODBUS. However, the sensor values are from the local sensors and software has not been developed to receive values from another source.
A data list of EKD 316 parameters is provided in Appendix II and the data for EKD 316C you can find it in the installation guide DKRCC.PI.RR0.A1.02
Please note that it is not possible to connect the EKA 164A universal display in this configuration.
© Danfoss | DCS (sw) | 2016.11 |
DKRCC.PD.RR0.B2.02 | 8 |
Data sheet | Superheat controller type EKD 316, EKD 316C
Installation
The EKD 316 / EKD 316C is normally mounted on a DIN rail, and the necessary connections are shown in the diagram. If the sensor S4 is not used to measure air temperature in connection with thermostat function or as part of the controlling loop, then it is not necessary to connect the S4 sensor. The 18-24 V battery input at terminals 15 and 16 is not required if battery back-up is not needed.
Power supply considerations
The terminals 1 and 2 for the voltage supply are not isolated from the rest of the controller terminals. This means care should be taken when connecting two or more controllers to the same voltage supply. In the example below, the two controllers are connected to the same voltage supply and on the input side, terminals 21 (Analogue Input) are connected to each controller and similarly terminals 22 (GND).
This way of connecting the controllers can cause damage and should be avoided.
Note:
The same applies to other signal inputs e.g. terminals 2 and 4. See warning page 5.
Stepper motor output
After installation the following checks can be made to the connection between the EKD 316 controller and the stepper motor of the ETS 6 / ETS valve.
With the power off, check that resistance between terminals 5 and 6 and terminals 7 and 8 is approximately:
ETS 6 / CCMT 0 : 46 Ohm CCMT 1 : 31 Ohm
ETS / KVS / CCMT 2 - CCMT 8 / CCM : 53 Ohm CCMT 16 - CCMT 42: 29 Ohm
ETS C / KVS C : 10 Ohm.
Make slight allowances for cable resistance.
If resistance values differ from above, ensure that the cable is properly connected to the actuator of the stepper motor valve.
1.With the power on and parameter o18 set to 1, measure the phase current from terminal 5 (or 6) and terminal 7 (or 8 ) with a true RMS multimeter when the valve is operating. The valve can be driven from 0% to 100% and vice versa by changing the valve opening percentage in parameter o45. The phase current should be 100 mA rms (for ETS) when operating.
2.If this not the case and the cable connections are correct, then the stepper motor driver in the EKD 316 might be damaged. Remember to set o18 back to 0 after checks. If checks 1) and 2) are not correct, ensure that motor cable corrections are correct and the cable length is less than 30 meters.
Output relay contact
The contact of the alarm relay will be made when there is an alarm.
Battery back-up
A battery back-up can be connected to terminals 3 (+) and 4 (-). It is recommended to use 24 V DC 100 mAh UPS. The voltage should be at least 18 V and this can be achieved by using two 9 V 100 mAh batteries in series, if temporary solution is to be used.
If the controllers are operated by a common analogue signal as above, the voltage supply should be separate as shown below.
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© Danfoss | DCS (sw) | 2016.11 |
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DKRCC.PD.RR0.B2.02 | 9 |
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