Samson 3374 Service manual

Electric Actuator

Type 3374

Mounting and

Operating Instructions

EB 8331-1 EN

Edition March 2004

Fig. 1 ⋅Type 3374 Actuator mounted on Type 3535 Three-way Valve

Contents Page

1 Design and principle of operation . . . . . . . . . . . . . . . . . . . . . . 3

1.1 Additional equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1.2 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2.1 Mounting position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2.2 Attachment to the valve . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

3 Electrical connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

4 Operation and adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . 10

4.1 Manual operation of the actuator . . . . . . . . . . . . . . . . . . . . . . . 10

4.2 Adjustment of additional equipment . . . . . . . . . . . . . . . . . . . . . 10

4.2.1 Limit switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

4.2.2 Potentiometers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

4.3 Setting the digital positioner . . . . . . . . . . . . . . . . . . . . . . . . . 12

5 Retrofitting additional electrical equipment . . . . . . . . . . . . . . . . . . 15

5.1 Limit switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

5.2 Potentiometers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

5.3 Digital positioner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

6 Dimensions in mm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Contents Safety instructions

The device may only be assembled, started up or operated by trained and ex-

perienced personnel familiar with the product.

According to these mounting and operating instructions, trained personnel is

referred to as individuals who are able to judge the work they are assigned to

and recognize possible dangers due to their specialized training, their knowl-

edge and experience as well as their knowledge of the applicable standards.

Any hazards which could be caused in the attached control valve by the pro-

cess medium, the operating pressure and moving parts are to be prevented by

means of the appropriate measures.

The actuators are designed for use in electrical power systems.

For wiring and maintenance, you are required to observe the relevant safety

regulations. Only use power interruption devices which are protected against

unintentional reconnection of the power supply. Take special care when mak-

ing adjustments on live parts. Do not remove covers!

Proper shipping and appropriate storage are assumed.

2EB 8331-1 EN

1 Design and principle of operation

The Type 3374 Electric Actuator is used in

industrial plants as well as in heating, venti-

lation and air-conditioning systems.

The linear actuator is suitable for form-fit at-

tachment to various SAMSON valve series,

depending on the version with or without

fail-safe action.

The actuators consist of a reversible syn-

chronous motor and a maintenance-free

planetary gear with ball screw.

The synchronous motor is switched off by

torque-dependent switches when the final

positions are reached or in case of an over-

load.

The motion is transmitted to the actuator

stem by the gears and ball screw.

Actuator versions with integrated yoke are

primarily used for attachment to Type 3260

(DN 65 to 150), Type 3214 (DN 65 to 150)

and Series V 2001 Valves.

Actuator versions for central attachment

using an M30 x 1.5 ring nut are preferably

combined with Type 3214 (DN 125 to 150)

and Series 240 Valves.

1.1 Additional equipment

The actuators can be equipped with addi-

tional units, such as limit switches and poten-

tiometers, to influence the tasks of control

systems.

In addition, the actuator can be equipped

with a digital positioner for processing

standard signals in the range of 0 (2) to

10 V or 4 (0) to 20 mA.

Refer to section 5 for details on retrofitting

additional equipment.

Note!

The device with a CE marking fulfils the requirements of the Directives 94/9/EC (ATEX) and

89/336/EEC (EMC).

The declaration of conformity can be viewed and downloaded on the Internet at

http://www.samson.de.

EB 8331-1 EN 3

Design and principle of operation

1.2 Technical data

Actuator Type 3374 -10 -11 -15 -21 -26 -31 -36

Version with Yoke Ring nut Yoke Ring nut Yoke Ring nut

Fail-safe action Without Actuator stem extends Actuator stem retracts

Rated travel mm 30 15 30/15 15

Actuating time

for rated travel

sec 240 120 240/120 120

Actuating time

for fail-safe action sec – 12

Nominal thrust 2.5 kN

Actuator stem extends and retracts

2 kN

Actuator stem extends

0.5 kN

Actuator stem retracts

Power supply 207 V to 253 V; 50 Hz , 99 V to 121 V; 60 Hz or 21.6 V to 27.6 V; 50 Hz

(other voltages on request)

Power consumption VA

Without positioner

With positioner

7.5/13

9.5/15

10.5/16

12.5/18

Motor switch-off Dependent on torque

Rated temperature range 5 to 60 °C

Storage temperature range –20 to +70 °C

Degree of protection IP 54 acc. to IEC 529, (IP 65 with cable glands1))

Suspended mounting not approved

Overvoltage category II

Design and inspection EN 61010, edition 3.94

Class of protection II

Noise immunity EN 50082 Part 2

Noise emission EN 50082 Part 1

Manual override Using hex wrench; no adjustment after fail-safe action has been triggered

Weight approx. kg 3.2 3.3 3.9 4.0 3.5 3.6

Materials Housing and cover of plastic (PPO glass fiber reinforced)

Additional electrical equipment

Limit switch Two travel-dependent, adjustable limit switches; perm. load 250 V AC ; 3A

Potentiometer2) 0 to 1000 Ω(0 to 900 Ωat rated travel), max. permissible current 1 mA

1) Cable glands M20 x 1.5 with metal nut, width across flats (SW) 23/24

2) Not for version with positioner

4EB 8331-1 EN

Technical data

Digital positioner 1)

Operating mode 1 Operating mode 2 Operating mode 3

Input variable 2) Range 4...20 mA, Ri = 0.05 kΩ

2...10 V, Ri = 10 k Ω

0...20 mA, Ri = 0.05 kΩ

0...10 V, Ri = 10 kΩ

Acc. to predetermined

values 3)

Resolution 10 bit

Position feedback

signal 4) 5) Range 4...20 mA, RB ≤0.2 kΩ

2...10 V, RB ≥ 5 kΩ

0...20 mA, RB ≤0.2 kΩ

0...10 V, RB ≥5 kΩ

Acc. to predetermined

values 3)

Resolution 8 bit

Characteristic Increasing, actuator stem retracts or extends

as the input variable increases

Acc. to predetermined

values 3)

Travel Adjustable 6 to 20 mm at rated travel 15 mm

6 to 35 mm at rated travel 30 mm

(the travel range has been extended from 12 to 35 mm to 6 to 35 mm for rated

travel 30 mm in positioner version V1.10 and higher)

Setting With travel calibration button (1 mm each time

the button is pressed)

Acc. to predetermined

values 3), with button

1 binary input Electrically isolated, switching voltage 18 to 30 V DC, approx. 7 mA

1 binary output Electrically isolated semiconductor contact, max. 45 V DC, min. 3 V DC,

max. 25 mA

Integrated interface for

SAMSON memory pen/PC

Transfers data about settings, operating status and messages

Transfer protocol: SAMSON SSP protocol

Retrofittable bus interface On request

Total delay time Approx. 30 ms

Accuracy ≤2.5 % without considering the dead band width

1) Maximum two current inputs may be switched in series

2) Maximum values ±50 mA or ±25 V

3) SAMSON TROVIS-VIEW Configuration and Operator Interface software, SAMSON memory pen

4) Can only be taken from current or voltage signal

5) Not when retrofittable interface is used

EB 8331-1 EN 5

Technical data

2Installation

2.1 Mounting position

Installation depends on the mounting posi-

tion of the valve. However, do not install the

actuator suspended downwards.

2.2 Attachment to the valve

Series V 2001 (DN 15 to 80),

Type 3260 Valves (DN 65 to 150) and

Type 3214 Valves (DN 65 to 100)

1. Remove protective covers and unscrew

nut (6) from the control valve.

2. Place actuator with yoke onto the valve

and fasten with the nut (6, SW 36)

using a min. tightening torque of

150 Nm. If necessary, retract actuator

stem slightly beforehand using the ma-

nual override.

3. When the plug stem (5) fits closely onto

the actuator stem (3), attach both coup-

ling clamps (4) and fasten with screws.

Series 240:

1. Push plug stem down to close the valve.

2. Turn coupling nut (8) until a distance of

x = 75 mm (x = 90 mm for DN 100

and larger) between the top of the yoke

and the top of the coupling nut (8) is

reached. Secure position with lock nut

(9).

3. Place actuator onto valve bonnet (2.3)

and fasten with ring nut (7).

If necessary, retract actuator stem

slightly beforehand using the manual

override.

4. When the coupling nut (8) fits closely

onto the actuator stem, attach both

coupling clamps (4) and screw tight.

5. Move actuator stem (3) to the end posi-

tion (valve closed) using the manual

override or motor.

6. Align travel indicator scale (10) to the

middle of the stem connector (4) and

screw tight.

Type 3214 (DN 125 to 150)

1. Place actuator onto the valve and se-

cure with the ring nut (7). If necessary,

retract actuator stem slightly before-

hand using the manual override.

2. When the plug stem fits closely onto the

actuator stem (3), attach both coupling

clamps (4) and screw tight.

3. Move actuator stem (3) to the end posi-

tion (valve closed) using the manual

override or motor.

4. Align travel indicator scale (10) to the

middle of the stem connector (4) and

screw tight.

6EB 8331-1 EN

Installation

Fig. 2 ⋅Attachment to the valve

2.1

2.3

910

2.2

Attachment to Type 3214

DN 125 to 150

1Actuator

2.1 Actuator yoke

2.2 Valve yoke

2.3 Bonnet

3Actuatorstem

4 Stem connector

5Plugstem

6Nut

7Ringnut

8Couplingnut

9Locknut

10 Travel indicator scale

Attachment to Series 240

Attachment to Series V 2001,

Type 3260 DN 65 to 150 and

Type 3214 DN 65 to 100

EB 8331-1 EN 7

Installation

3 Electrical connections

Upon installation of the electric con-

nections, you are required to ob-

serve the regulations concerning

electrical power plant systems ac-

cording to DIN VDE 0100 as well as

the regulations of your local power

supplier.

Install electrical connections as indicated on

the circuit diagram included in the actuator

cover and as illustrated in Figs. 3 and 4.

A maximum of 3 cable glands can be at-

tached to the housing for cable entries.

Fig. 3 ⋅Terminal connections, version for three-step signal

aL eL N NL

N+–LN

Ce Ce

41 44 42 51 54 52 81 82 83 91 92 93

Retracts

Extends

Magnet in version with

fail-safe action

Potentiometers (optional)

Limit switches (optional)

3-step signal

8EB 8331-1 EN

Electrical connections

Warning!

Only connect to the main power network

when the power is switched off.

Only use power interruption devices

which ensure that the power cannot be

switched on again unintentionally.

Particularly for 24 V, 50 Hz actuators,

use wires with a sufficiently large cross-

section to guarantee that the permissible

voltage tolerances are not exceeded.

Fig. 4 ⋅Terminal connections for version with digital positioner

31 32 33 13 12 11

41 44 42 51 54 52

83 84

81 82 NL

mA VV

Limit switches (optional)

Positionfeedback Input Binaryinput Binaryoutput Powersupply

Load max. 25 mA

Magnet in version

with fail-safe action

EB 8331-1 EN 9

Electrical connections

4 Operation and adjustment

4.1 Manual operation of the actua-

tor

To operate the manual override, place

4 mm hex wrench on the red actuator shaft

located at the side of the housing.

The hex wrench is delivered with the actua-

tor. It is attached to the bottom side of the

housing.

4.2 Adjustment of additional equip-

ment

To access the additional equipment, un-

screw the four fixing screws and take off the

cover.

Adjust while the power is switched

on!

4.2.1 Limit switches

1. Use motor or manual override to move

the control valve to the position where

the switching function is to be activated.

2. Use hex wrench to turn spindle (2) for

the upper limit switch or spindle (3) for

the lower limit switch until the associ-

ated contact cam on the cam

bracket (7) triggers the switch contact of

the upper or lower microswitch (1).

4.2.2 Potentiometers

The gears of the potentiometers (12) and

(13) must be put onto their shafts corre-

sponding with the rated travel of the control

valve. The rated travel inscription “Nenn-

hub 15“ or “Nennhub 30“ must be legible.

If this is not the case, pull each poten-

tiometer gear off the shaft and put it back

on again with the reverse side of the wheel

facing upwards, ensuring it is aligned

roughly flush with the potentiometer shaft.

Zero point adjustment

1. Use motor or manual override to move

the control valve to the desired end posi-

tion.

2. Place screwdriver on the slotted poten-

tiometer shaft (12.1 and 13.1).

3. Adjust resistance value with a con-

nected ohmmeter by turning the corre-

sponding potentiometer shaft.

10 EB 8331-1 EN

Operation and adjustment

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