Samson Automobile Parts EB 8331 1 EN User Guide
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  
 
Safety instructions  
General safety instructions  
4 Assembly, start-up and operation of this device may only be performed by  
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.  
4 Any hazards which could be caused in the connected valve by the process  
medium, operating pressure or moving parts are to be prevented by means  
of the appropriate measures.  
4 The actuators has been designed for use in electrical power installations.  
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!  
4 Proper transportation and storage are assumed.  
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  
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.  
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.  
Refer to section 5 for details on retrofitting  
additional equipment.  
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 us-  
ing an M30 x 1.5 ring nut are preferably  
combined with Series 240 Valves and  
Type 3214 (DN 125 to 150) .  
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  
Safety function  
Rated travel  
Yoke  
Ring nut  
Yoke  
Ring nut  
Yoke  
Ring nut  
Without  
15  
Stem extends  
Stem retracts  
mm  
30  
30/15  
15  
Actuating time for  
rated travel  
240  
120  
240/120  
120  
s
Actuating time in case of  
fail-safe action  
–
12  
s
2.5 kN  
Stem extends or retracts  
2 kN  
Stem extends  
0.5 kN  
Stem retracts  
Nominal thrust  
Power supply  
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)  
Power consumption  
Without positioner  
With positioner  
VA  
7.5/13  
9.5/15  
10.5/16  
12.5/18  
Motor switch-off  
Torque-dependent  
5 to 60 °C  
Rated temperature range  
Storage temperature range  
Degree of protection  
–20 to +70 °C  
IP 54 according to IEC 529, (IP 65 with cable glands 1)  
Suspended mounting position not approved  
)
Overvoltage category  
Design and inspection  
Class of protection  
Noise immunity  
II  
EN 61010 Edition 3.94  
II  
EN 50082 Part 2  
EN 50082 Part 1  
Noise emission  
Manual override  
Using hex wrench · Adjustment impossible after fail-safe action has been triggered  
Manual adjustment of actuators with fail-safe action only possible when supply  
voltage is applied (see also section 4.1)  
Weight, approx. kg  
Materials  
3.2  
3.3  
3.9  
4.0  
3.5  
3.6  
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 2)  
0 to 1000 Ω, (0 to 900 Ω at rated travel) max. permissible current 1 mA  
1)  
2)  
Cable glands M20 x 1.5 with metal nut, width across flats 23/24 mm  
Not for version with positioner  
6
EB 8331-1 EN  
 
 
Design and principle of operation  
Digital positioner 1)  
Operating mode 1  
Operating mode 2  
Operating mode 3  
As per settings 3)  
4...20 mA, Ri = 0.05 kΩ 0...20 mA, Ri = 0.05 kΩ  
2...10 V, Ri = 10 kΩ  
Range  
Input variable 2)  
0...10 V, Ri = 10 kΩ  
Resolution  
Range  
10 Bit  
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  
As per settings 3)  
As per settings 3)  
Position feedback  
signal 4) 5)  
Resolution  
8 Bit  
Increasing, actuator stem retracts or extends  
as the input variable increases  
Characteristic  
Travel  
Adjustable  
Setting  
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)  
Using travel calibration button  
(1 mm each time the button is pressed)  
As per settings 3)  
using button  
1 binary input  
1 binary output  
Electrically isolated, switching voltage 18 to 30 V DC, approx. 7 mA  
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  
Total delay time  
Accuracy  
On request  
Approx. 30 ms  
≤ 2.5 % without taking the dead band into account  
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  
EB 8331-1 EN  
7
 
Installation  
the top of the coupling nut (8) is  
reached. Secure position with lock nut  
(9).  
2
Installation  
2.1 Mounting position  
3. Place actuator onto valve bonnet (2.3)  
and fasten with ring nut (7).  
Installation depends on the mounting posi-  
tion of the valve. However, do not install the  
actuator suspended downwards.  
If necessary, retract actuator stem  
slightly beforehand using the manual  
override.  
Note!  
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.  
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)  
Type 3214 (DN 125 to 250)  
1. Remove protective covers and unscrew  
nut (6) from the control valve.  
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.  
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.  
4. Align travel indicator scale (10) to the  
middle of the stem connector (4) and  
screw tight.  
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  
8
EB 8331-1 EN  
 
 
Installation  
Attachment to Series V 2001,  
Type 3260 DN 65 to 150 and  
Type 3214 DN 65 to 100  
Attachment to Series 240  
1
1
2.3  
7
2.1  
3
x
3
4
8
9
4
5
10  
5
6
1
2.2  
7
1
Actuator  
2.1 Actuator yoke  
2.2 Valve yoke  
2.3 Bonnet  
3
4
5
6
7
8
9
Actuator stem  
Stem connector  
Plug stem  
Nut  
Ring nut  
Coupling nut  
Lock nut  
Attachment to Type 3214  
DN 125 to 250  
3
10  
4
5
10 Travel indicator scale  
Fig. 2 · Attachment to the valve  
EB 8331-1 EN  
9
 
Electrical connections  
3
Electrical connections  
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.  
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
Retracts  
Extends  
eL  
aL  
Ce  
Ce  
–
+
N
N
N
L
L
aL eL  
N
Magnet in version with  
fail-safe action  
Limit switches (optional)  
Potentiometer (optional)  
81 82 83 91 92 93  
41 44 42 51 54 52  
a
e
e
a
Fig. 3 · Terminal connections, version for three-point stepping signal  
10 EB 8331-1 EN  
 
 
Electrical connections  
Caution!  
4 Only connect to the main power network 4 Particularly for 24 V, 50 Hz actuators,  
when the power is switched off.  
use wires with a sufficiently large  
cross-section to guarantee that the per-  
missible voltage tolerances are not ex-  
ceeded.  
4 Only use power interruption devices  
which ensure that the power cannot be  
switched on again unintentionally.  
Limit switches (optional)  
41 44 42 51 54 52  
Load, max. 25 mA  
V
mA  
_
+
+
V
V
mA  
V
_
_
_
+
N
N
L
L
+
+
+
31 32 33 13 12 11 81 82  
83 84  
Magnet in version with  
fail-safe action  
Position feedback  
Input  
Binary input  
active when  
voltage is  
applied  
Binary output  
Power supply  
Fig. 4 · Terminal connections, version with digital positioner  
EB 8331-1 EN 11  
 
Operation and setting  
4
Operation and setting  
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).  
4.1 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).  
4.2.2 Potentiometers  
Set the selector switch (2, in Fig. 6) of the  
actuator with positioner to the operating  
The gears of the potentiometers (12) and  
(13) must be put onto their shafts to  
correspond with the rated travel of the con-  
trol valve. The rated travel inscription  
“Nennhub 15” or “Nennhub 30” must be  
legible. If this is not the case, pull each po-  
tentiometer 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.  
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.  
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:  
Perform settings while the power is  
switched on!  
81/82 = 0 Ω; 91/93 = 0 Ω;  
Actuator stem retracts:  
81/83 = 0 Ω; 91/92 = 0 Ω.  
12 EB 8331-1 EN  
 
 
Operation and setting  
Limit switch  
Stem retracts  
Metal tag  
Stem extends  
Rated travel inscription  
12 12.1 13  
13.1  
a
e
a
B
15  
Nennhub  
1
2
3
5
7
Microswitch  
Spindle upwards  
Spindle downwards  
Intermediate gear  
Cam bracket  
12 Gear potentiometer 1  
12.1 Potentiometer shaft  
13 Gear potentiometer 2  
13.1 Potentiometer shaft  
1
2
3
7
5
Fig. 5 · Performing settings  
EB 8331-1 EN 13  
 
Operation and setting  
1. Set selector switch (2) with the arrow  
pointing to operating mode 0 =  
4.3 Setting the digital positioner  
In the actuator version with digital  
(control switched off).  
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.  
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.  
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!  
Note!  
Actuators with fail-safe action "Actuator  
stem retracts" or "extends" are only de-  
signed for a rated travel of 15 mm. Do not  
rearrange the gear!  
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 soft-  
ware and a PC or bus system. Setup with  
Make sure that the shaft of the potentiometer  
(12.1) is adjusted correctly.  
operating modes 3 und 0 =  
is described  
in Mounting and Operating Instructions  
EB 8331-2 EN.  
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.  
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:  
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.  
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.  
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.  
After pressing the travel calibration but-  
ton (4), the actuator stem first moves as far  
1
2
3
4
5
6
7
Operating mode 1  
Selector switch  
Operating mode2  
Travel calibration button  
Operating mode 0  
Operating mode 3  
Potentiometer counter-  
clockwise or clockwise  
Signal lamp  
Signal lamp  
1 2  
3
4
5
6
7
8
9
SAMSON  
2
10  
11  
8
9
1
3
10 Actuator stem extends  
and retracts  
11 Interface jack  
12 Potentiometer gear  
12.1 Potentiometer shaft  
Stellungsregler  
Positioner  
Régulateur de position  
Intermediate gear  
Intermediate gear  
Gear (12)  
Position for rated travel 15  
12  
Rated travel  
inscription  
B
Gear (12)  
Position for rated travel 30  
Intermediate gear  
12.1  
Fig. 6 · Selector switch and position of potentiometer gears in version with digital positioner  
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.  
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.  
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 actu-  
ator is in control operation. The actuator  
stem moves to the valve position determined  
by the reference variable.  
Note!  
If both signal lamps start to blink simulta-  
neously 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 dur-  
ing calibration, e.g. due to a loose or miss-  
ing potentiometer gear, both signal lamps  
blink alternately.  
Note!  
If one of the signal lamps starts to blink  
slowly after the travel calibration button has  
been pressed and the actuator stem has ex-  
tended to the valve's CLOSED position, the  
potentiometer shaft (12.1) has been wrongly  
positioned. Readjust it manually.  
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  
5
Retrofitting additional  
electrical equipment  
Travel calibration is usually based on the  
maximum travel of the control valve.  
The actuator can be subsequently equipped  
with two limit switches, two potentiometers  
or a digital positioner.  
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.  
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.  
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.  
Caution!  
When installing electrical equipment, make  
sure the supply voltage and the signal input  
are disconnected. Only use power interrup-  
tion devices which are protected against un-  
intentional reconnection of the power sup-  
ply.  
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.  
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  
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).  
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).  
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).  
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 con-  
tinue pushing it further towards the cable  
entry.  
2. Clip the spindle gear (2) onto the sleeve  
(3). Make sure the lateral latch is prop-  
erly 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.  
8. Secure the cam bracket (7) and interme-  
diate 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 to-  
wards 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.  
4 Adjust limit switches as described in sec-  
tion 4.2.1.  
18 EB 8331-1 EN  
 
 
Retrofitting additional electrical equipment  
1
2
3
4
5
6
7
8
Actuator board  
Spindle gear  
Sleeve  
9
Spacer  
10 Serrated ring  
11 Terminal board with  
microswitches  
12 Gear in version  
with potentiometer  
Spindle  
Intermediate gear  
Contact cam  
Cam bracket  
Adjustment gear  
7.1 Position of the contact cams (6) on the cam bracket (7)  
7
8
9
5
4
3
2
1
12  
6
6
For actuator stem  
retracts  
extends  
7.2 Position of the cam bracket (7)  
5
12  
7
11  
10  
B
8
For actuator stem retracts  
For actuator stem extends  
7
B
5
2
Fig. 7 · Retrofitting limit switches, in this example model 3374-11000002000, version with potentiometers  
EB 8331-1 EN 19  
 
Retrofitting additional electrical equipment  
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.  
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.  
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 us-  
ing screws.  
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 re-  
place it with a board with potentiom-  
eters.  
2. Clip the spindle gear (2) onto the sleeve  
(3) as illustrated in Fig. 7, top. Make  
4 Adjust the potentiometer as described in  
section 4.2.2.  
1
2
5
Actuator board  
Contact cam  
Intermediate gear 13 Gear potentiometer 2  
10 Serrated ring  
12 Gear potentiometer 1  
10  
5
2
13  
12  
1
Fig. 8 · Version with potentiometer  
20 EB 8331-1 EN  
 
 
Retrofitting additional electrical equipment  
5.3 Digital positioner  
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).  
5
6
7
8
Intermediate gear  
Contact cam  
Cam bracket  
Adjustment gears  
Note! Actuators with a digital positioner  
cannot be equipped with a potentiometer.  
10 Serrated ring  
12 Gear feedback potentiometer  
1. Remove the fastening screws. Push the  
actuator board (1) from its guiding to  
the right. Take out the board and re-  
place 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 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.  
8
7
5
10  
12  
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.  
Fig. 9 · Version with positioner  
without (top) and with (bottom) limit switches  
EB 8331-1 EN 21  
 
 
Retrofitting additional electrical equipment  
4 Mount the actuator on the valve and set  
the positioner as described in section  
4.3 of these instructions.  
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 sig-  
nal 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.  
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  
 
 
Dimensions in mm  
6
Dimensions in mm  
Version with yoke  
Version with ring nut  
193  
120  
60  
Stem connector  
EB 8331-1 EN 23  
 
 
SAMSON AG · MESS- UND REGELTECHNIK  
Weismüllerstraße 3 · 60314 Frankfurt am Main · Germany  
Phone: +49 69 4009-0 · Fax: +49 69 4009-1507  
Internet: http://www.samson.de  
EB 8331-1 EN  
 

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