Samson EB 8331-1 User Manual [EN]

Electric Actuator
Type 3374

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

Mounting and
Operating Instructions

EB 8331-1 EN

Edition October 2007

Contents

Contents Page

1 Design and principle of operation . . . . . . . . . . . . . . . . . . . 5

1.1 Additional equipment. . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.2 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2 Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.1 Mounting position . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.2 Attachment to the valve . . . . . . . . . . . . . . . . . . . . . . . . . 8

3 Electrical connections . . . . . . . . . . . . . . . . . . . . . . . . . 10

4 Operation and setting . . . . . . . . . . . . . . . . . . . . . . . . 12

4.1 Manual operation of the actuator . . . . . . . . . . . . . . . . . . . 12

4.2 Setting the additional equipment . . . . . . . . . . . . . . . . . . . . 12

4.2.1 Limit switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

4.2.2 Potentiometers . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

4.3 Setting the digital positioner . . . . . . . . . . . . . . . . . . . . . . 14

5 Retrofitting additional electrical equipment . . . . . . . . . . . . . . 17

5.1 Limit switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

5.2 Potentiometers . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

5.3 Digital positioner . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

5.3.1 Calibrating the positioner . . . . . . . . . . . . . . . . . . . . . . . 22

5.3.2 Simplest method to calibrate the actuator. . . . . . . . . . . . . . . . 22

6 Dimensions in mm . . . . . . . . . . . . . . . . . . . . . . . . . . 23

2 EB 8331-1 EN

Safety instructions

General safety instructions

Assembly, start-up and operation of this device may only be performed by

4

trained and experienced personnel familiar with the product.
According to these mounting and operating instructions, trained personnel
refers to individuals who are able to judge the work they are assigned to
and recognize possible hazards due to their specialized training, their
knowledge and experience as well as their knowledge of the applicable
standards.
Any hazards which could be caused in the connected valve by the process

4

medium, operating pressure or moving parts are to be prevented by means
of the appropriate measures.
The actuators has been designed for use in electrical power installations.

4

For wiring and maintenance, you are required to observe the relevant safety
regulations. The actuator must be protected against unintentional
reconnection of the power supply.
Take special care when making adjustments on live parts. Do not remove
any covers!
Proper transportation and storage are assumed.

4

EB 8331-1 EN 3

Note:

Actuators with a CE marking fulfill the requirements of the Directives 94/9/EC and
89/336/EEC.
The Declaration of Conformity is available on request.

4 EB 8331-1 EN

Design and principle of operation

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 synchronous motor and a mainte
nance-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 Series
V 2001 Valves, Type 3260 (DN 65 to 150),
and Type 3214 (DN 65 to 250) Valves.
Actuator versions for central attachment us­ing an M30 x 1.5 ring nut are preferably
combined with Series 240 Valves and
Type 3214 (DN 125 to 150) .

1.1 Additional equipment

The actuators can be equipped with addi
tional units, such as limit switches and po
tentiometers, to influence the tasks of control

­equipment. In addition, the actuator can be

equipped with a digital positioner for pro

­cessing 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.

-

-

-

-

EB 8331-1 EN 5

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
Safety function Without Stem extends Stem retracts
Rated travel mm 30 15 30/15 15
Actuating time for

rated travel s
Actuating time in case of

fail-safe action s

Nominal thrust

Power supply

Power consumption VA

Without positioner

With positioner
Motor switch-off Torque-dependent
Rated temperature range 5 to 60 °C
Storage temperature range –20 to +70 °C
Degree of protection IP 54 according to IEC 529, (IP 65 with cable glands

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 · Adjustment impossible 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 made of plastic (PPO glass fiber reinforced)

Additional electrical equipment

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

1)

Cable glands M20 x 1.5 with metal nut, width across flats 23/24 mm

2)

Not for version with positioner

2)

240 120 240/120 120

–12

2.5 kN

Stem extends or retracts

207 V to 253 V; 50 Hz, 90 V to 127 V; 60 Hz

or 21.6 V to 27.6 V; 50 Hz (other voltages on request)

7.5/13

9.5/15

Suspended mounting position not approved

Manual adjustment of actuators with fail-safe action only possible when supply

voltage is applied (see also section 4.1)

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

2kN

Stem extends

10.5/16

12.5/18

0.5 kN

Stem retracts

1)

)

6 EB 8331-1 EN

Design and principle of operation

Digital positioner

1)

Operating mode 1 Operating mode 2 Operating mode 3

Input variable

2)

Range

4...20 mA, Ri = 0.05 k

2...10 V, Ri = 10 k

0...20 mA, Ri = 0.05 k

Ω

0...10 V, Ri = 10 k

Ω

Ω

Ω

As per settings

Resolution 10 Bit

Position feedback

4) 5)

signal

Characteristic

Range

4...20 mA, R

2...10 V, R

B

B

0.2≤k
5 k

≥

Ω

Ω

0...20 mA, R

0...10 V, R

Resolution 8 Bit

Increasing, actuator stem retracts or extends

as the input variable increases

0.2 k

≤

Ω

B

5 k

≥

Ω

B

As per settings

As per settings

Travel Adjustable 6 to 20 mm at 15 mm rated travel

6 to 35 mm at 30 mm rated travel

(the travel range between 12 and 35 mm has been extended to between 6

and 35 mm for 30 mm rated travel in positioner version V1.10 and higher)

Setting

Using travel calibration button

(1 mm each time the button is pressed)

As per settings

using 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

Data transmission including settings, operating status and alarms

Transfer protocol: SAMSON SSP protocol

Retrofittable bus interface On request

Total delay time Approx. 30 ms

Accuracy

1)

Maximum two current inputs may be switched in series

2)

Maximum values ±50 mA or ±25 V

3)

SAMSON TROVIS-VIEW Operator Interface software, SAMSON memory pen

4)

Can only be taken from current or voltage signal

5)

Not when retrofittable interface is used

2.5 % without taking the dead band into account

≤

3)

3)

3)

3)

EB 8331-1 EN 7

Installation

2 Installation

2.1 Mounting position

Installation depends on the mounting posi
tion of the valve. However, do not install the
actuator suspended downwards.

Note!

Manual override is only possible in actua
tors with fail-safe action when the power
supply is connected (see section 4.1).

-

-

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 minimum tightening torque of
150 Nm. If necessary, retract actuator
stem slightly beforehand using the man
ual override.

3. When the plug stem (5) fits closely onto
the actuator stem (3), attach both stem
connector clamps (4) and fasten with
screws.

Series 240

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 stem
connector 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 250)

1. Place actuator onto the valve and secure
with the ring nut (7). If necessary, retract
actuator stem slightly beforehand using
the manual override.

2. When the plug stem fits closely onto the

-

actuator stem (3), attach both stem
connector 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.

-

-

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

8 EB 8331-1 EN

Installation

Attachment to Series V 2001,

Type 3260 DN 65 to 150 and

Type 3214 DN 65 to 100

1

2.1
3

4
5

6

1

2.2

7
3

10

4
5

Attachment to Type 3214
DN 125 to 250

Attachment to Series 240

1

2.3
7

3

4
8

9

1 Actuator

2.1 Actuator yoke

2.2 Valve yoke

2.3 Bonnet
3 Actuator stem
4 Stem connector
5 Plug stem
6 Nut
7 Ring nut
8 Coupling nut
9 Lock nut
10 Travel indicator scale

x

10

5

Fig. 2 · Attachment to the valve

EB 8331-1 EN 9

Electrical connections

3 Electrical connections

Upon installation of the electric ca
bles, you are required to observe the
regulations concerning electrical
power installations according to DIN
VDE 0100 as well as the regulations
of your local power supplier.

L

Ce

Ce

N+–LN

Establish electrical connections as indicated
on the circuit diagram on 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.

Retracts

eL

aL

Extends

-

aL eL N

Limit switches (optional)

41 44 42 51 54 52

Fig. 3 · Terminal connections, version for three-point stepping signal

NL

Magnet in version with
fail-safe action

10 EB 8331-1 EN

Potentiometer (optional)

81 82 83 91 92 93

ea ae

Caution!

Only connect to the main power network

4

when the power is switched off.
Only use power interruption devices

4

which ensure that the power cannot be
switched on again unintentionally.

Limit switches (optional)

41 44 42 51 54 52

Electrical connections

Particularly for 24 V, 50 Hz actuators,

4

use wires with a sufficiently large
cross-section to guarantee that the per
missible voltage tolerances are not ex
ceeded.

-

-

Load, max. 25 mA

V

mA

_

++

V

mA

_

++

13

33

32

31

Position feedback Input Binary input Binary output Power supply

Fig. 4 · Terminal connections, version with digital positioner

12

11

V

_

+

81

82

active when
voltage is
applied

83

V

_

+

84

NL

NL

Magnet in version with
fail-safe action

EB 8331-1 EN 11

Operation and setting

4 Operation and setting

4.1 Manual operation of the
actuator

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 actuator. It is
attached to the bottom of the housing.

Manual override is only possible in actua
tors with fail-safe action when the power
supply is connected (terminals N and L).

Set the selector switch (2, in Fig. 6) of the
actuator with positioner to the operating
mode 0 =.

-

4.2 Setting the additional
equipment

To access the additional equipment, unscrew
the four fixing screws on the cover using a
Pozidrive PZ2 screwdriver to provide
enough hold on the screw heads. Take off
the cover.
After completing the settings and establish
ing the electrical connection, refasten the
cover. To proceed, place back on the cover
and screw the cover screws in slightly to po
sition the cover before tightening them prop
erly.

Perform settings 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 associated
contact cam on the cam bracket (7) trig
gers 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 to
correspond with the rated travel of the con­trol valve. The rated travel inscription
“Nennhub 15” or “Nennhub 30” must be
legible. If this is not the case, pull each po­tentiometer 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 potenti
ometer shaft (12.1 and 13.1).

3. Calibrate potentiometer using the con
nected ohmmeter correspondingly:
Actuator stem extends:
81/82 = 0Ω; 91/93 = 0Ω;
Actuator stem retracts:
81/83 = 0Ω; 91/92 = 0Ω.

-

-

-

-

12 EB 8331-1 EN

Limit switch
Stem retracts

Operation and setting

Metal tag

Stem extends

Rated travel inscription

12

1312.1

13.1

aae

B

15

Nennhub

12 3 75

1 Microswitch
2 Spindle upwards
3 Spindle downwards
5 Intermediate gear
7 Cam bracket
12 Gear potentiometer 1

12.1 Potentiometer shaft
13 Gear potentiometer 2

13.1 Potentiometer shaft

Fig. 5 · Performing settings

EB 8331-1 EN 13

Operation and setting

4.3 Setting the digital positioner

In the actuator version with digital
positioner, the travel is calibrated automati
cally, allowing the travel (controlled variable
x) and the input signal (reference variable
w) of the positioner to be matched in the
best possible way. Additionally, the digital
positioner provides valve position feedback
for remote transmission.

Setting and start-up can be carried out us
ing four different operating modes. Oper
ating modes 1 and 2 work with set data
stored in the positioner's memory. The user
only needs to select the operating mode via
the selector switch (2) and press the button
(4) to start travel calibration.

Note!

Setup with operating modes 3 and 0 =
can only be performed using a SAMSON
memory pen as the storage medium, or in
connection with SAMSON's TROVIS-VIEW
Configuration and Operator Interface soft­ware and a PC or bus system. Setup with
operating modes 3 und 0 = is described
in Mounting and Operating Instructions

EB 8331-2 EN.

Settings for operating modes 1 and 2

Increasing characteristic: actuator stem re
tracts or extends as the reference variable
increases.

After the actuator has been mounted on the
valve as described in section 2.2 and the
electrical connections have been established
as described in section 3, proceed as fol
lows:

-

-

-

-

1. Set selector switch (2) with the arrow
pointing to operating mode 0 =

-

(control switched off).

2. Check mounting position of the potenti
ometer gear (12).

The gear must be put onto the potentiometer
shaft to correspond with the rated travel of
the control valve. The inscription
“Nennhub 15” (for 6 to 20 mm travel) or
“Nennhub 30” (for 6 to 35 mm travel) must
be legible from above on the associated
gear side. If this is not the case, pull the
gear off the shaft and put it back on again
with the reverse side facing upwards, allow
ing the intermediate gear to engage prop
erly.

Note!

Actuators with fail-safe action "Actuator
stem retracts" or "extends" are only de­signed for a rated travel of 15 mm. Do not
rearrange the gear!

Make sure that the shaft of the potentiometer
(12.1) is adjusted correctly.

3. Switch on auxiliary power and set the
reference variable to a value > 4 mA.

4. Set selector switch (2) with the arrow
pointing to operating mode 1 for 4 to
20 mA or 2 to 10 V input and alarm
signal, or set it to operating mode 2 for
0 to 20 mA or 0 to 10 V input and
alarm signal.

5. Press button (4) to start travel calibra
tion.

-

-

-

-

14 EB 8331-1 EN

Operation and setting

Press the button briefly to obtain a travel
calibration for valve CLOSED when the actu
ator stem extends.
Direction of action: Increasing/increasing.

Hold the button pressed for longer than 3
seconds (indicated by switchover from sig

­nal lamp 8 to signal lamp 9) to obtain a
travel calibration for valve CLOSED when
the actuator stem retracts.
Direction of action: Increasing/decreasing.

1 Operating mode 1
2 Selector switch
3 Operating mode2
4 Travel calibration button
5 Operating mode 0
6 Operating mode 3
7 Potentiometer counter-

clockwise or clockwise
8 Signal lamp
9 Signal lamp
10 Actuator stem extends

and retracts
11 Interface jack
12 Potentiometer gear

12.1 Potentiometer shaft

2

13

-

Caution!

The automatic travel calibration lasts
approximately twice as long as the
actuator's transit time. During this
period, the valve leaves its current
position. Calibrate the travel either
on the test bench or when the
shut-off valves in the plant are
closed.

After pressing the travel calibration but
ton (4), the actuator stem first moves as far

431 72 8

65

SAMSON

Stellungsregler
Positioner
Régulateur de position

9

-

10

11

Gear (12)
Position for rated travel 15

Gear (12)
Position for rated travel 30

Fig. 6 · Selector switch and position of potentiometer gears in version with digital positioner

Intermediate gear

Rated travel
inscription

Intermediate gear

12

B

12.1

Intermediate gear

EB 8331-1 EN 15

Operation and setting

as it will go to the valve's CLOSED position.
Calibration is carried out when both signal
lamps (8 and 9) are lit.

Travel calibration starts after the mounting
position of the potentiometer gear (12) has
been determined automatically. This is indi
cated by signal lamp (8) for 6 to 35 mm
travel and by signal lamp (9) for 6 to
20 mm travel.

When travel calibration starts, the lower sig
nal lamp (9) blinks quickly for about 10 sec
onds. The actuator stem retracts as far as it
will go (maximum travel - valve OPEN).

Travel calibration is successfully completed
when the end position is reached. The actu­ator is in control operation. The actuator
stem moves to the valve position determined
by the reference variable.

-

Note!

If one of the signal lamps starts to blink
slowly after the travel calibration button has
been pressed and the actuator stem has ex­tended to the valve's CLOSED position, the
potentiometer shaft (12.1) has been wrongly
positioned. Readjust it manually.

Do not adjust the potentiometer before the
closed position is actually reached. This is
indicated by the associated, activated limit
switch on the board (Fig. 5 on page 13).
To proceed, adjust the shaft of the potenti
ometer (12.1) by turning it gradually clock
wise or counterclockwise with a screwdriver
until the signal lamp stops blinking and is
constantly illuminated. Turn the screwdriver
counterclockwise if the upper signal lamp

-

(8) blinks, and clockwise if the lower signal

-

lamp (9) blinks, corresponding to the icons
(7). Travel calibration does not continue until
both signal lamps are illuminated at the
same time.

Note!

If both signal lamps start to blink simulta­neously during travel calibration, interrupt
calibration by pressing the travel calibration
button (4) and check the mounting position
of the potentiometer gear (12) again.
If no travel motion can be determined dur­ing calibration, e.g. due to a loose or miss­ing potentiometer gear, both signal lamps
blink alternately.
If this is the case, interrupt travel calibration
by pressing the button (4), correct the error,
and restart calibration by pressing the but
ton (4) again.

-

-

-

16 EB 8331-1 EN

Retrofitting additional electrical equipment

Setting with limited travel range

Travel calibration is usually based on the
maximum travel of the control valve.

If, however, the maximum possible travel is
to be limited to a smaller travel end value,
press the button (4) once at the start of cali
bration while the signal lamp blinks for
10 seconds. As a result, travel calibration
via the potentiometer gear with rated travel
15 or 30 is limited to 6 mm. Each time the
button is pressed, the travel range is in
creased by 1 mm.

If, for example, a control valve designed for
15 mm is to be operated with a limited
travel range of 10 mm, press the button (4)
5 times during the 10 second time limit. The
top signal lamp (8) flashes each time the key
is pressed.

Reporting defined events

At the binary output (terminal 83 and 84),
predefined events can be indicated (see
EB 8331-2 EN) during positioner operation
and transmitted to a control room.

-

5 Retrofitting additional

electrical equipment

The actuator can be subsequently equipped
with two limit switches, two potentiometers
or a digital positioner.

­Depending on the actuator version used, the

actuator board needs to be replaced as
well.

The actuator version is marked on the name
plate, e.g. model 3374-11000002000.

When ordering additional electrical equip
ment from the manufacturer, make sure to
include this model number in the order.

Caution!

When installing electrical equipment, make
sure the supply voltage and the signal input
are disconnected. Only use power interrup­tion devices which are protected against un­intentional reconnection of the power sup­ply.

Note!

It is recommendable to slightly apply lubri
cant (e.g. Vaseline) to the spindles on the
gear faces and to the sides of the cogs.

-

-

-

EB 8331-1 EN 17

Retrofitting additional electrical equipment

5.1 Limit switches

The retrofit kit (order no. 1400-8830) is re
quired to install limit switches. If the actuator
is not already equipped with potentiometers
or a positioner, the basic unit (order no.
1400-8829) is also required. The unit in
cludes the spindle gear (2) and the interme
diate gear (5).

Note! To mount the limit switches, the actua
tor stem must be in end position, i.e. the
stem must be either fully extended or fully
retracted. If necessary, move the stem to the
appropriate position using the manual over
ride on the side.

1. Remove the fastening screws. Push the
actuator board (1) from its guiding to
the right. Slightly lift the board and con­tinue pushing it further towards the cable
entry.

2. Clip the spindle gear (2) onto the sleeve
(3). Make sure the lateral latch is prop­erly engaged in the groove of the sleeve.

3. Plug intermediate gear (5) onto the spin
dle (4). Place the serrated ring (10) on
top and push it down until it will not go
any further.

4. Plug both premounted contact cams (6)
with the ring gear first onto the cam
bracket (7).

5. Push adjustment gears (8) onto their
spindles and fasten with one screw
each. Check whether the adjustment
screws can be turned easily. If not,
slightly loosen the screw again.

-

6. Turn both contact cams (6) as illustrated

-

-

-

-

-

in Fig. 7.1 corresponding with the posi
tion of the actuator stem on the cam
bracket (7).

7. Push the spacer (9) onto the spindle for
the cam bracket. Push the cam bracket
with both cams onto the spindle corre
sponding with the position of the actua
tor stem as illustrated in Fig. 7.2. Make
sure that the outermost cog of the cam
bracket (7) engages in the gearwheel of
the intermediate gear (5). In addition,
the adjustment gears (8) must engage
properly in the corresponding gears of
the contact cams (6).

8. Secure the cam bracket (7) and interme­diate gear (5) with the serrated ring
(10), pushing the ring down until it will
not go any further.

9. Position the terminal board (11) at the
base of the support at a 45° angle
(approx.) with the switches facing to­wards the gears. Push the upper end of
the terminal board towards the gears
until the board is in a vertical position
and properly engaged in the support.

10.Push the actuator board (1) back into its
guiding. Make sure that the gears are
properly engaged. Fasten the board us
ing screws.

Adjust limit switches as described in sec

4

tion 4.2.1.

-

-

-

-

-

18 EB 8331-1 EN

Retrofitting additional electrical equipment

8 954 32112

71110

1 Actuator board
2 Spindle gear
3 Sleeve
4 Spindle
5 Intermediate gear
6 Contact cam
7 Cam bracket
8 Adjustment gear

7.1 Position of the contact cams (6) on the cam bracket (7)

9 Spacer
10 Serrated ring
11 Terminal board with

microswitches

12 Gear in version

with potentiometer

7

6

For actuator stem

retracts extends

7.2 Position of the cam bracket (7)

5 12

B

6

8

7

For actuator stem retracts

For actuator stem extends

52

Fig. 7 · Retrofitting limit switches, in this example model 3374-11000002000, version with potentiometers

EB 8331-1 EN 19

B

Retrofitting additional electrical equipment

5.2 Potentiometers

Actuators with a digital positioner cannot be
equipped with potentiometers.

To install the potentiometers, an actuator
board with the appropriate potentiometers
and gears (12 and 13) is required.

If the actuator is not already equipped with
limit switches, the basic unit (order no.
1400-8829) is also required. The unit in
cludes the spindle gear (2) and the interme
diate gear (5).

1. Remove the fastening screws. Push the
actuator board (1) from its guiding to
the right. Take out the board and re­place it with a board with potentiom­eters.

2. Clip the spindle gear (2) onto the sleeve
(3) as illustrated in Fig. 7, top. Make

1 Actuator board
2 Contact cam
5 Intermediate gear

10 Serrated ring
12 Gear potentiometer 1
13 Gear potentiometer 2

-

sure the lateral latch is properly en
gaged in the groove of the sleeve.

3. Plug intermediate gear (5) onto the spin
dle (4). Place the serrated ring (10) on
top and push it down until it will not go
any further.

4. The potentiometer gears (12 and 13)
with retaining rings must be put onto
their shafts corresponding with the rated
travel of the control valve. The rated

-

travel inscription “Nennhub 15” (on the
upper side with the retaining ring) or
“Nennhub 30” (lower side) must be legi
ble from above (also see Figs. 4 and 5).

5. Push the actuator board back into its
guiding. Make sure that the gears are
properly engaged. Fasten the board us­ing screws.

Adjust the potentiometer as described in

4

section 4.2.2.

-

-

-

10 5 2 13 12 1

Fig. 8 · Version with potentiometer

20 EB 8331-1 EN

5.3 Digital positioner

Retrofitting additional electrical equipment

To install a positioner, a corresponding ac

­tuator board and TROVIS-VIEW 3374 and
connecting cable 0450-1978 are necessary.

If the actuator is not already equipped with
limit switches, the basic unit (order no.
1400-8829) is also required. The unit in

­cludes the spindle gear (2) and the interme
diate gear (5).

Note! Actuators with a digital positioner
cannot be equipped with a potentiometer.

1. Remove the fastening screws. Push the

actuator board (1) from its guiding to
the right. Take out the board and re­place it with a board with positioner.

2. Clip the spindle gear (2) onto the sleeve

(3) as illustrated in Fig. 7, top. Make
sure the lateral latch is properly en­gaged in the groove of the sleeve.

3. Plug intermediate gear (5) onto the spin-

dle (4). Place the serrated ring (10) on
top and push it down until it will not go
any further.

4. The gear (12) on the feedback potenti

­ometer, which is equipped with a retain
ing ring, must be put onto its shaft corre
sponding with the rated travel of the
control valve. The rated travel inscription
“Nennhub 15” (on the upper side with
the retaining ring) or “Nennhub 30”
(lower side) must be legible from above
(also see Figs. 4 and 5).

5. Push the actuator board (1) back into its
guiding. Make sure that the gears are
properly engaged. Fasten the board us
ing screws.

5 Intermediate gear

-

6 Contact cam
7 Cam bracket
8 Adjustment gears
10 Serrated ring
12 Gear feedback potentiometer

8751012

-

-

-

Fig. 9 · Version with positioner

without (top) and with (bottom) limit switches

EB 8331-1 EN 21

Retrofitting additional electrical equipment

5.3.1 Calibrating the positioner

To calibrate the positioner, proceed as de
scribed in section 4 of EB 8331-2 EN.

5.3.2 Simplest method to calibrate
the actuator

If tools such as the TROVIS-VIEW software,
PC etc. are not available for calibration of
the actuator and the actuator operation with
maximum precision is not necessary, the
simplest calibration method can be per
formed as follows:

1. Position the selector switch (2) to operat-

ing mode 0 =.

2. Press down the travel calibration button

(5) for at least 15 seconds until both sig­nal lamps light up.

3. Release the button to start calibration.

The actuator stem extends until the
torque-dependent switches switch off the
actuator.
The position of the potentiometer is
checked.

-

Mount the actuator on the valve and set

4

the positioner as described in section

-

4.3 of these instructions.

4. Re-adjust the potentiometer, if neces

sary, while observing the signal lamps.
Refer to the description given on
page 14 of EB 8331-2 EN.
After adjusting the potentiometer, the
calibration of the actuator is continued.

22 EB 8331-1 EN

-

6 Dimensions in mm

Dimensions in mm

Version with yoke

120

294

15 (30)

50

60

193

Stem connector

Version with ring nut

204

90 (75)

30 (15)

EB 8331-1 EN 23

SAMSON AG · MESS- UND REGELTECHNIK
Weismüllerstraße 3 · 60314 Frankfurt am Main · Germany
Phone: [phone] · Fax: [phone]
Internet: http://www.samson.de

EB 8331-1 EN

S/Z 2007-10