Danfoss EKD 316 Manual
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Danfoss EKD 316 Manual

Superheat controller
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MAKING MODERN LIVING POSSIBLE
Manual
Superheat Controller,
type EKD 316
Advantages
Main features
DKRCC.PS.RP0.A1.02/520H7142
ƒ The superheat is regulated to the lowest
possible value.
ƒ The evaporator is charged optimally – even
when there are great variations of load and
suction pressure.
ƒ Regulation of superheat
ƒ MOP function
ƒ ON/OFF input for start/stop of regulation
ƒ Relay output to alarm
EKD 316 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:
ƒ Processing plant (water chillers)
ƒ Cold store (air coolers)
ƒ A/C plant
ƒ Heat pumps
ƒ Air conditioning
ƒ Energy savings – the adaptive regulation of
the refrigerant injection ensures optimum
utilisation of the evaporator and thus a high
suction pressure.
ƒ MOD bus communication
ƒ Safety features and
ƒ Alarm indications
©Danfoss A/S (AC-MCI / sw), 2014-03

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Summary of Contents for Danfoss EKD 316

  • Page 1 MAKING MODERN LIVING POSSIBLE Manual Superheat Controller, type EKD 316 EKD 316 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.

  • Page 2: Table Of Contents

    Operation ..............................11 The application diagram shows the use of EKD 316 as a superheat Types of regulation .

  • Page 3: Data

    Any external connection with grounding could create a ground Warning loop through a diode in the rectifier bridge which could destroy 21,22 the power supply in EKD 316. Accessories Pressure transducer Temperature sensor External display Programming key...

  • Page 4: Configuration

    Data communication Independent superheat regulation Valve driver (Via Analog Signal) Data communication with the EKD 316 is possible using one of the Via standard MODBUS device The superheat in the evaporator is controlled by one pressure This is where the controller receives signals from another following two ways: Communication direct to MODBUS RTU protocol.

  • Page 5: Installation

    Choice of S2 sensor type Surface sensor S2 * Suction pipe of copper or on thin (≤ 3mm) steel pipe. The EKD 316 is normally mounted on a DIN rail, and the necessary Stepper motor output S2 sensor positioning in the suction line Remember to put on heat conducting paste and insulate the connections are shown in the diagram.

  • Page 6: Start Of Controller

    Load Defined superheat. The reference follows a defined curve. This curve is defined by Before using the EKD 316 controller, there are settings that have to The parameter SH mode selects the controlling form where it can three values: the closing value, the min. value and the max. value.

  • Page 7: Types Of Regulation

    1 and then setting parameter o45 to the reducing the value of the Integration Time Tn. The EKD 316 has the traditional PI controlling function with the Kp required opening degree between 0% and 100%. Relay outputs factor for Proportional Gain and Tn for Integration Time in seconds.

  • Page 8: Finding The Optimum Settings

    Proportional Gain has the following values relative to superheat SH: The force opening of valve function has been implemented in SH min and SH max. the EKD 316 controller. After startup, this function will provide a Evaporator superheat too high 2. Check valve capacity.

  • Page 9: Menu Survey

    Manual Superheat controller type EKD 316 Manual Superheat controller type EKD 316 Appendix I Miscellaneous Controller’s address   Menu survey SW = 1.32 If the valve’s opening degree should be controlled with an external signal, the signal is defined as: 0: no signal Fac.

  • Page 10: Survey Of Functions

    Manual Superheat controller type EKD 316 Manual Superheat controller type EKD 316 Survey of functions Survey and function (continued) Function Para- Parameter by operation via Damping of amplification near reference value Kp Min meter data communication This setting damps the normal amplification Kp, but only just around the reference value.

  • Page 11: General Information To Modbus Communication Via A Plc Etc

    Reg. type * Example: Depending on the application, control can be carried out based on different param- EKD 316 as simple ETS valve driver function with the following eters. settings: The two possibilities are shown in section "Type of regulation".

  • Page 12: Ekd 316 - Parameter Identification (Modbus)

    Actual value – Values are read/written as 16 bit integer values without decimals. This is the default value as read via modbus Your local Danfoss agent will be pleased to assist with further Scale – This shows the scaling factor of the value. *1 means that there is no scaling. *10 means that the read value is 10 times larger than advice, etc.

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