Danfoss EKE 347 Data sheet

Data Sheet

Liquid level controller Type EKE 347

An intuitive and easy to navigate controller with Modbus network capability

The EKE 347 controller is used for regulation of the liquid level in:

• Pump reservoirs

• Separators

• Intermediate coolers

• Economisers

• Condensers

• Receivers

The controller is communicating with a transmitter that continuously measures the liquid level in the actual reservoir.

By comparing the measured value with the level setpoint entered by the customer, the controller dictates the valve to increase or decrease the liquid ow to or from the reservoir.

AI190286434038en-000501

Liquid level controller, Type EKE 347

Features

• Liquid level control

• Alarm if the set alarm limits are exceeded

• Relay outputs for upper and lower level limits and for alarm level

• User friendly and easy setup Wizard for rst time conguration

• PI control

• Low or High side control

• When AKV/A is selected, a MASTER/SLAVE system can run up to 3 AKV/A with distributed Opening Degree

• Manual control of output

• Limitation of Opening degree possible

• ON/OFF operation with hysteresis

• Programming menu with 3 access levels and separate passwords

• Connection to other EKE 347 controllers possible

• Wired remote display possible

• BUS communication:

◦ CAN Bus (Danfoss internal only) ◦ MODBUS RTU RS485 for communication with e.g. PLC

EKE 347 assembly

MODBUS communication

Remote Display - option

Danfoss

M84H0081_1

AKS 4100/ AKS 4100U

EKE 347

Danfoss

M84H0086_1

PLC Master

PLC Slave

EKE 347 Slave

MODBUS-RTU network

Danfoss

M84H0087_1

Remote display

EKE 347

Danfoss CAN bus

EKE 347

Signaltransmitter

With the guided micro wave rod AKS 4100/4100U it is possible to set the refrigerant level within a wide range.

EKE 347

The controller receive a signal which enable it to contol low or high side applications (see page 3). EKE 347 does support 2 types of Danfoss expansion valves. (see below) One analog input is available as feed back from ICM in order to indicate opening degree of the ICM.

Expansion valves

Two types of Danfoss expansion valves can be used

ICM

ICM are direct operated motorized valves driven by digital stepper motor type ICAD

AKV/A

AKVA or AKV are pulse-width modulating expansion valves.

MODBUS communication

EKE 347 include as standard RS 485 based MODBUSRTU bus communication interface to third party equipment like PLC. Via the MODBUS it is possible to read and write parameters to the EKE 347 Operation, monitoring and data collection can then be performed via PLC from a SCADA system.

Remote Display - option

A remote display for panel mounting is available. From the remote display a full overview and access is possible to all individual EKE 347 controllers connected to the internal Danfoss CAN bus.

Liquid level controller, Type EKE 347

Functions

Table 1: Functions

Table 2: Functions

ICM with ICAD mo tor

EKE 347

AKS 4100/ AKS 4100U

EKE 347

Liquid level controller, Type EKE 347

Applications

Pump reservoir

Modulating control of injection for a more stable liquid level and suction pressure.

Figure 1: System conguration ICAD

Separator on ooded evaporator

Modulating control and the valve’s large capacity range ensure a stable level - even under conditions of quickly changing loads.

Figure 2: System conguration AKV/A

Intermediate cooler

The level transmitter’s wide measuring range enables it to monitor the liquid at all levels of the reservoir - and hence to use the signal for safety functions in connection with the max. permissible level.

EKE 347

AKS 4100/ AKS 4100U

System configuration AKV/A

Regulating principle: Low Level Signal setup: AKS 4100/U

EKE 347

AKS 4100/ AKS 4100U

System configuration AKV/A

Regulating principle: High Level Signal setup: AKS 4100/U

Liquid level controller, Type EKE 347

Figure 3: System conguration AKV/A

Receiver / condenser

The control system’s short reaction time makes it very suited for high-pressure oat systems with small refrigerant charges.

Figure 4: System conguration AKV/A

Supply voltage

24 V AC ±20% 50 / 60 Hz or 24 V DC ±20% (the supply voltage is galvanically separated from the input and output signals. Input/output are not individual galvanic isolated)

Power consumption

Controller 20 W coil for AKV or AKVA

15 VA / 10W 55 VA

Input signal * Ri = 0(4) – 20mA: 33 ohm 0(2) – 10 V: 100 kohm

Level signal *

4 – 20 mA or 0 – 10 V

ICM valve feedback signal *

From ICAD 0/4 – 20 mA

Contact function start / stop of regulation

Relay output

3 pcs. SPDT (Lower level alarm, Upper level alarm, Common alarm / NC Solenoid)

Normally Open:

3 A GP*, 2.2 FLA / 13.2 LRA, 1/6 hp, PD 220 VA, 250 V AC 100 k 3 FLA / 18 LRA, 1/10 hp, PD 150 VA, 125 V AC 100 k

Normally Closed:

3 A GP*, 250 V AC 100 k (*GP = General purpose) Max 240 V AC or 24 V AC / DC can be used, but same voltage type must be used on DO3 and DO2

Current output

0 – 20 mA or 4 – 20 mA

Max. load: 500 ohm

Valve connection

ICM - via current output AKV/A- via 24 AC Pulse-Width Modulating output

Data communication

MODBUS RTU: Communication to system controller,

MODBUS on RS485: galvanic isolation (500 V DC)

CAN: Communication to other EKE controllers

Supported Modbus Commands

Supported commands with max of 50 ms response time 03 (0x03) Read Holding Registers

04 (0x04) Read Input Registers

06 (0x06) Write Single Register

Supported commands without

dened max response time 08 (0x08) Diagnostics

16 (0x10) Write Multiple Registers (up to 20 registers)

43 (0x2b) Read Device

Identication

Environments

-20 °C – 55 °C, during operation

-30 °C – 80 °C, during storage

90% Rh, not condensed

No shock

inuence / vibrations

Enclosure

IP20 / IP40 for the front mounted into a panel

Weight

193 g

Mounting

DIN rail

Display

Graphical LCD display

Terminals

plugs 1.5 or 2.5 mm2 multicore

Terminals

28-29

Supply voltage 24 V a.c. or d.c.

1-7

Signal from level transmitter type AKS 4100/4100U

7-10

Signal from level transmitter type AKS 41

36-37

Expansion valve type AKV or AKVA

23-24

Expansion valve type: ICM with ICAD

13-14

Switch function for start/stop of controller. If a switch is not connected, terminals 13 and 14 must be shortcircuited

Liquid level controller, Type EKE 347

Product specication

Electrical connection

Table 3: Electrical connection

Material specication

Table 4: Material specication

Connection

Table 5: Necessary connections

 NOTE:

See the gures on the next pages.

AKS4100 /4100U

AKS 41

DI1 - main switch

4-20 mA

CANbus connection

to other EKE controllers

plug for

remote display

ModBUS

4-20 mA

24V DC

yellow

blue

orange

ICAD 1stgen

ICAD/ICM

feedback

ICAD 2ndgen

blue

24V AC

–

2 3

yellow

gray

orange

ICAD 1stgen (p re 2010)

ICAD 2ndgen (2010 +)

yellow

green

brown

white

24V+

15V+

5V+

COM

AI 5

AI 4

AI 3

AI 2

AI 1

COM

DI 2

DI 1

COM

R120

CAN H

CAN L

GND

R GNDD+D-

COM

AO 1

CAN RJ

24V DC

15 16 17 18 19 20 21 22 23 24

2 3 4 5 6 7 8 9 10 11 12 13 14

Upper level

Danfoss

80Z8109

Terminals

33-35

Relay for common alarm. Installer can choose between Normally Open (33-34) or Normally Closed (34-35) circuits. The relay will switch according to the programmed setting

25-27

Relay for low level limit. Installer can choose between Normally Open (26-27) or Normally Closed (25-26) circuits. The relay will switch when the set value is passed.

30-32

Relay for upper level limit. Installer can choose between Normally Open (30-31) or Normally Closed (31-32) circuits. The relay will switch when the set value is passed.

6-10

ICM valve feedback signal from ICAD 0/4 – 20 mA

Liquid level controller, Type EKE 347

Table 6: Application dependent connections

Figure 5: Connections - Upper level

+ 16 hidden pages

Danfoss EKE 347 Data sheet

Specifications and Main Features

Frequently Asked Questions

User Manual