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
1
2.1
3
4
5
6
x
1
2.3
7
3
4
8
910
5
1
2.2
7
3
10
4
5
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
eL
aL
Ce Ce
L
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
NL
++
_
++
_
_
+_
+V
mA VV
mA
V
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