Danfoss AMEi 6 iSET Data sheet

Data sheet

Intelligent electrical actuator AMEi 6 iSET

Description

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AMEi 6 iSET actuator for intelligent optimization of the District Heating/Cooling substation operation. Automatic adjustment of Δp setting on AFP 2, AFPQ 2 and AFQMP 2 controllers, used in DHC systems.

Solution for dynamic DH systems with wide span of min - max ow (Domestic Hot Water service) and for systems with improperly sized control equipment (oversized control valves, wrong valve selection/characteristic, poor control ratio...)

Auto stabilization function monitors control signal and stabilizes oscillations at the partial/ low load operating conditions, by adjustment of the Δp over the motorized control valve (MCV).

Constant-real time MCV operation improvement led to more stable control without oscillations and ow delivered up to the real needs (overow prevention).

This results in stable temperature conditions on the secondary side, improvement of ΔT on the primary side and longer lifetime of installed equipment.

Features:

· Auto stabilization function

· Electrical manual operation

· Position indication, LED signalization

· Adjustable min/max Δp setting by the end switch (adjustable stroke limitation of the pressure actuator)

· Thermal and overload protection

· External reset button

· Easy mounting, pre-fixing with the wire lock

· Anti-rotation strap for preventing actuator from rotating

· Automatic calibration to the pressure actuator stroke-reduced commissioning time

· Maintenance free

· Voltage or current input/output signal Y/X

· Modbus RS485

Galvanic insulation Y, X

· Equipped with cable glands

Main Data:

· Nominal voltage:

- 24 V ac/dc, 50/60 Hz

- 230 V ac, 50/60 Hz

· Control input signal: modulating

· Torque: 7 Nm

· Speed 36 s/turn (18 sec/mm)

· Full stroke time ~30 min

· Compatible with modulating 24 V and 230 V actuators AME 20/23/30/33, AME 55/56, AME 85/86, AME 655/655GA/658/659

· Compatibility with 3 point AMV actuators not available yet

iSET is not the solution for disturbances and oscillations coming from the network.

External oscillations generated by the other substations, disturbances because of the poor control at the heat source, or poor network balancing in general are out of the iSET range and can’t be managed.

Ordering

Typ e

AMEi 6 iSET 230 ac 082G4300

AMEi 6 iSET 24 ac /dc 082G4301

Supply voltage

(V)

Code No.

Data sheet AMEi 6 iSET

Technical data

Please check power supply and power consumption prior connection!

Actuator type AMEi 6 iSE T

Power supply V 24 V ac/dc or 230 V ac; +10...-15%

Power consumption VA

Frequency Hz 50/60

Control input Y

Control output X

Torque Nm 7

Speed s/turn 36

Full stroke time min 30

Max. medium temperature

Ambient temperature 0 … + 55

Storage and transport temperature – 40... +70 (storing for 3 days)

Humidity 5-95% (no condensing)

Protection class

Grade of enclosure IP 54

Weight kg 2.5

Manual operation Electrical

Power failure response Actuator remains in last position

- marking in accordance with the standards

V 0-10 (2-10) [Ri = 40 kΩ]

mA 0-20 (4-20) [Ri = 500 Ω]

V 0-10 (2-10) [Ri = 10 kΩ]

mA 0-20 (4-20) [Ri = 510 Ω]

Depends on valve type. No limitations for 150 °C

°C

Low Voltage Directive (LVD) 2014/35/EU: EN 60730-1, EN 60730-2-14 Electromagnetic Compatibility Directive (EMC) 2014/30/EU: EN 61000-6-2, EN 61000-6-3

8 (24V)

16 (230V )

230V- protection class II

24V- protection class III

Design

1. Service cover

2. Function buttons

3. Wire lock

4. Cable gland

5. End switch

6. LED signalization for actuator operating modes

7. LED signalization for Modbus communication status

Installation The actuators should be mounted in a dry

environment. In case of outdoor installation, the actuator has to be protected against climatic influences by suitable measures. For exact installation instruction manuals for relevant pressure actuator should be followed.

Mechanical

Please check the allowed installation positions for the valve and pressure actuator. AMEi 6 actuator can be installed in all positions (seescheme). Allow for necessary clearance for maintenance purposes (see section Dimensions).

Electrical connection

Electrical connections can be accessed by removing the service cover.

2 | AI303648130321en-010202 © Danfoss | 2021.06

Data sheet AMEi 6 iSET

AMEi 6 iSET

Application principle

Example:

- Indirectly connected heating system

- Return mounting

- Analog voltage signal

Auto stabilization function

control signal (from controller)

MCV position

Threshold (% of valve opening)

iSET ∆p setting

∆p For design flow

Fig. 1

Auto stabilization function (ASF)

iSET Auto Stabilization Function (ASF) constantly monitors control signal. In case of appearing signal oscillations, iSET algorithm detects the oscillations and automatically adjusts differential pressure (Δp ) over the motorized control valve (MCV) by changing the Δp setting on the differential pressure controller. This is done by stretching and squeezing the setting spring on the pressure actuator, until the control signal is stabilized. Result is more stable operation conditions of MCV and improved substation/ system efficiency.

Operation principle (Fig . 1)

Auto Stabilization Function (ASF) searches for 3 consecutive peaks (P1, P2, P3) in control signal. When peaks are detected and when the MCV position is below treshold, ASF calculates needed Δp reduction, and reduces set Δp over the MCV by stretching the spring on the pressure actuator. When calculated point is reached, it stops. In case of repeating oscillations, procedure repeats, until the oscillations are eliminated and MCV is opened more than 50% (factory set treshold of the valve stroke/control signal). As soon as the control signal crosses threshold value, iSET moves towards to the initially set Δp (Δp set for design flow conditions). If the control signal is stable and below threshold, iSET remains in position.

To prevent the oscillations after the system is stabilized, ASF function monitors not only oscillations, but also analyses type of control signal (slow damping, suitable damping, too strong damping…). Based on signal specifics it provides proper reaction (Δp correction).

Data sheet AMEi 6 iSET

Actuator operating modes

LED operating mode indicator

The three-colour (green/yellow/red) LED function indicators are located at the front of actuator top cover. They indicate different operating modes.

RESET button

Actuators AMEi 6 iNET/iSET have external RESET button which is located on top cover of the actuator . With this button you can enter or exit Stand-By mode (press once) or Self positioning mode based on preset end switch positions (press and hold for 5 seconds). See next paragraph for mode details.

LED operating mode indicator

The three-colour (green/yellow/red) LED function indicators are located at the front of actuator top cover. They indicate different operating modes.

Operating modes

• Calibration mode:

For calibration to the desired pressure actuator stroke (min-max spring setting). To start calibration

procedure, press and hold RESET button for 5 seconds until the green light starts flashing. End positions of the actuator are automatically adopted based on pre-set end switch positions pins. Actuator goes to the stationary mode and starts responding to the control signal.

• Stand-By mode for manual operation

Press the RESET button for 1 sec. to enter Stand-By mode. The actuator stops in current position

and stops responding to any control signal. Red light is constantly lit. You can manually operate the actuator Actuator will start to travel automatically in required direction. To stop it in desired position, press

the SQUEEZE SPRING or STRETCH SPRING button again. For fine adjustments press & hold the SQUEEZE SPRING or STRETCH SPRING button for < 10 sec.

Actuator will travel in required direction as long as the button is pressed, but no longer than 10 sec.

Stand-by mode can be very useful during the commissioning, or for service purposes. To exit

Stand-By mode press the RESET button again.

by pressing and holding the SQUEEZE SPRING or STRETCH SPRING button for > 10 sec

• Positioning mode

The actuator is operating automatically, according to the control signal. When positioning is

finished the actuator goes to stationary mode.

• Stationary mode

The actuator is operating without errors.

• Error mode

Working temperature is too high - check the ambient temperature.

Actuator is not properly mechanically connected - check the connection. Pressure actuator is blocked.

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