NV24-MFT-T, NVG24-MFT2, NV24-MFT2 Direct-coupled

NV24-MFT-T, NVG24-MFT2, NV24-MFT2

Direct-coupled actuators for globe valves

H

Y

Linear actuators for globe valves of 8...20 mm lift

Modulating actuator(AC/DC 24 V)

Control signal DC 0...10 V

Wiring diagram

-

T

T

1

~

~ 2

+

Y

3

AC 24 V

+

DC 24 V

/

Z

4

Y2

5

U /

MP

6

!

Connect via safety isolating transformer

Y DC 0...10 V

Y2

U DC 2...10 V

7

NV24-MFT-T

NV24-MFT2

NVG24-MFT2

Control signal from controller

Measuring voltage U for position indication

Technical data

Nominal voltage

Nominal voltage range

For wire sizing

Power consumption

Connecting cable: terminals:

Control

Operating range

Position checkback

Uni-rotation

Nominal stroke

Actuating force

Manual operation

Running time

Sound power level

Position indication

Protection class

Degree of protection

Ambient temp. range

Non-operating temp.

Humidity test

EMC

Software

Mode of operation

Maintenance

Weight

NV24-MFT-T NV24-MFT2

AC 24 V, 50/60 Hz, DC 24 V

AC 19.2...28.8 V

DC 21.6...28.8 V

5 VA

3 W

1 m, 5 x 0.75 mm 2

NVG24-MFT2

1 m, 5 x 0.75 mm 2

2 x 1.5 mm 2 or 1 x 2.5 mm 2

DC 0...10 V @ 100 k

Ω

DC 2...10 V for 0...100% stroke

2...10 V @ 0.5 mA

±5%

20 mm

1000 N 1) / (800 N) 2) 1600 N hexagonal key, self resetting 3)

150 s max. 35 dB (A) mechanical 8...20 mm stroke (mounting bracket)

III (safety extra-low voltage)

IP54

0°...+50°C

–40°...+80°C to EN 60730-1

CE according to 89/336/EEC, 92/31/EEC, 93/68/EEC

Class A to EN 60730-1

Type 1 to EN 60730-1 maintenance-free

1.7 kg (without mounting bracket UNV)

1)

2)

3)

Electrical closing force

Blocking force

Permanent manual operation to order

14

Applications

The NV24-MFT-T, NVG24-MFT2 and

NV24-MFT2 actuators are intended for motorizing globe valves by exerting an operating force on the valve stem in either a retracting or an extending direction.

Mode of operation

Modulating control is effected by means of a standard signal of DC 0...10 V.

The control signal is produced by the microprocessor and acts on the brushless motor. When the actuator is powered up for the first time the stroke is acquired automatically and stored in the microprocessor. The control signal and the running time are then adapted to suit that value of stroke. If no correct adaption is performed at that time (e.g. because there is no valve mounted) another adaption will be performed the next time the actuator is powered up. When the actuator is lifting and it reaches the seat for either VALVE

OPEN or VALVE CLOSED the supply of current to the actuator is reduced. The actuator has an anti-blocking feature which, should dirt on the valve seat prevent it from closing properly, causes the actuator to move several times in the open and close directions over 1 to 5% stroke.

High-speed version

With the Type NV24-MFT2 actuator the running time can be reduced to 35 s or

17 s for 10 mm stroke.

Functional reability

The actuator is short-circuit-proof and protected against polarity reversal. The stroke is adapted automatically.

Manual operation

Inserting a 5 mm hexagonal key and turning it clockwise causes the spindle of the actuator to emerge from the housing (an extending action). The spindle will remain in that position until the power supply is applied (the controller has first priority).

Position indication

The stroke is indicated mechanically on the UNV-... mounting bracket and the maximum stroke adjusts itself automatically. There is a two-colour LED status indicator under the cover of the housing.

Safety note

The linear actuator contains no components which the user can replace or repair.

Dimensions

The dimensions depend on the type of

UNV-... mounting bracket used; see from

Page 22.

NV24-MFT Direct-coupled actuators for globe valves

Arrangement of the operating controls

H1 S1

S2

S3.1

1

M

–

T

1 ~ 2 3 4 5

+

Y / Z Y2 U / MP

ON

S3

1 2

H

Symbol

Y

ON

1

S3.2

2

H

Symbol

Y

Under the cover of the actuator are the terminals for connecting the lead, the control devices S1, S2 and S3 and the LED indicator H1.

By setting the slide switch S3 appropriately or by pressing push-buttons S1 and S2 it is possible to configure the actuator very simply on-site to suit actual requirements when changes from the factory settings are needed.

ON

2

LED indicator H1 see details on Page 20

Functional description S

Function

Test

Description

The valve covers the full stroke in maximum running time and verifies the adapted stroke to ensure that both end-points are reached (H = 0% and H = 100%).

Adaptation The effected stroke (between the two mechanical end-stops of the valve) is acquired as 100% stroke and stored in the microprocessor. The control signal and running time are then matched to this 100% stroke.

Direction of stroke The direction of travel in response to the control signal direct 0% control signal corresponds to 0% position checkback.

(The actuating spindle is then retracted or extended depending on the choice of closing point).

inverted

Closing point valve up down

0% control signal corresponds to 100% position checkback.

(The actuating spindle is then retracted or extended depending on the choice of closing point).

The closing point is when the actuating spindle is either retracted or extended. There is no flow through the valve control path.

The actuating spindle is retracted into the actuator and the valve stem is extended from the valve body. The position checkback shows 0% for direct travel.

The actuating spindle is extended from the actuator and the valve stem is retracted into the valve body. The position checkback shows 0% for direct travel.

(This setting is not necessary with Belimo Type H4.., H5.., H6..

and H7.. globe valves.)

Switch

S1 press

S2 press

S3.1

OFF

ON

S3.2

OFF

ON

Only properly authorised and trained persons may change the settings of slide switch S3 and push-button S2.

Symbol

H

H

Y

Symbol

Y

Bold type in the table means standard factory setting.

Effect

U

5

U

5

Effect

Y

Y

U

5

= 0%

U

5

= 100%

U

5

= 100%

U

5

= 0%

MFT

Parameter

Control signal

Operating range

Position checkback

U

5

Running time

Actuating force

Standard

DC 0...10 V

DC 2...10 V

DC 2...10 V

150 s

100%

Variable

3-point, Open/Closed

Start point DC 0.5...30 V

End point DC 2.5...32 V

Start point 0.5...8 V

End point 1.5...10 V

Parameterizable for fault alarm

(35) 75...300 s 1)

(17) 35...300 s 2)

25...100%

1) with NV24-MFT-T, NVG24-MFT2

2) with NV24-MFT2

Multi-Function Technology allows optimum matching of parameters to the different needs of an installation. The parameters are either entered as standard values at the factory or altered subsequently using an MFT-H adjuster.

Bold type in the table means standard factory setting.

15

Wiring diagrams NV..

Wiring diagram NV24-3-T, NV230-3-T

3-point

Symbols

Actuator spindle moves

T

~

AC 24 V

-

+ DC 24 V

!


N L1 AC 230 V a b

1 2 3

T

Y1

-

+

Y2 NV24-3-T a b

1

N

2 3

Y1 Y2 NV230-3-T

7.5 s/mm

4.5 s/mm

∆

∆

∆

∆

OFF

S1.1

OFF

S1.2

OFF

ON

ON OFF

ON ON

1

0

1

0

0

1

0

1

0

0

1

0

1

0

0

1

0

1 stationary

IN

IN

IN

IN stationary

OUT

OUT

OUT

OUT

In the case of the classic 3-point actuator (NV..-3-T) the actuating time can be reduced from 7.5 s/mm to 4.5 s/mm by moving the slide switch 1.1 to the «ON» position. With less than 20% of the valves used the closing point is in the down position so the slide switch S1.2 can be set to the «ON» position.

Wiring diagram NV24-MFT(2)-T, NVF24-MFT(2)(-E)-T, NVG24-MFT2

Symbols

Modulating


1 T

T

–

~

+

AC 24 V

DC 24 V

+

2

~

Y

⁄

3

Z

4

Y2 U

⁄

5

MP

!


Y (DC 0...10 V) from controller

U

5

(DC 2...10 V)

NV24-MFT(2)-T

NVF24-MFT(2)(-E)-T

NVG24-MFT2

H

H

Y

∆

∆

∆

∆

OFF

S3.1

OFF

S3.2

OFF

ON

ON

1)

OFF

ON

1)

ON x x x x x x x x x x x x x x x x

IN

IN

IN

IN

OUT

OUT

OUT

Y OUT

1) If the controller produces a negative signal (<0.15 V) the slide switch S3.1 may not be set to the «ON» position if the parameters for the working range of the actuator have been assigned to

2...10 V (except when the start point in the parameterized working range is 0.5 V).

Setting the slide switch S3.1 to the «ON» position inverts the control signal so that the valve closes as the control signal is increased.

This is a simple way of matching the sequences in the actuator. With less than 20% of the valves used the closing point is in the down position so the slide switch S3.2 must be set to the «ON» position. The position checkback signal U

5 is also matched to the closing point.

Wiring diagram NV24-MFT(2)-T, NVF24-MFT(2)(-E)-T, NVG24-MFT2

Symbols

3-point parameterized MFT actuator


T

~

AC 24 V

!


T 1

~

2

Y

⁄

3

Z a b

U

5

(DC 2...10 V)

4

Y2 U

⁄

5

MP

NV24-MFT(2)-T

NVF24-MFT(2)(-E)-T

NVG24-MFT2

Y2

Y2

H+

H-

H+

Y1

Y1

∆

∆

∆

∆

OFF

S3.1

OFF

S3.2

OFF

ON

ON OFF

ON ON

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

0

1

* ) * ) m m

0 m m m m m m stationary

IN

IN

IN

H-

IN

*) Measuring signal U

5 according to position m: When control contact a or b is in position 1 for longer than the running time (150 s) stationary

OUT

OUT

OUT

OUT

The MFT linear actuator NV..-MFT.. can also be used as a 3-point control device. However, in this case the actuator must be assigned parameters for 3-point control and be provided with a 4-wire connection. Note: It will only function with an AC 24 V power supply!

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