Ytc YT-3400 SERIES User manual

SMART POSITIONER PRODUCT MANUAL
YT-3400 / 3450 SERIES
VERSION 1.06

2 YT-3400/3450 series
Contents
1. Introduction ……………………………………………………………………………………………… 5
1.1 General information for the users …………………………………………………………………. 5
1.2 Manufacturer Warranty …………………………………………………………………………… 5
1.3 Explosion Proof Warning ………………………………………………………………………. 6
2. Product Description ………………………………………………………………………………….. 7
2.1 General …………………………………………………………………………………………….. 7
2.2 Main Features and Functions ……………………………………………………………………. 7
2.3 Label Description ………………………………………………………………………………….. 8
2.4 Product Number …………………………………………………………………………………… 9
2.5 Product Specification ……………………………………………………………………………… 10
2.6 Explosion Proof Certifications…………………………………………………………………….. 11
2.7 Parts and Assembly ……………………………………………………………………………….. 12
2.8 Product Dimension ………………………………………………………………………………… 13
2.8.1 YT-3400 / 3450L………………………………………………………………………… 13
2.8.2 YT-3400 / 3450R (Fork Lever Type)…………………………………………………… 13
2.8.3 YT-3400 / 3450R (Namur Type)…………………………………………………………14
3. Installation ………………………………………………………………………………………………. 15
3.1 Safety ……………………………………………………………………………………………….. 15
3.2 Tools for installation……………………………………………………………………………….. 15
3.3 YT-3400 / 3450L Installation ……………………………………………………………………… 15
3.3.1 Installation Steps ………………………………………………………………………... 16
3.4 YT-3400 / 3450R Installation ……………………………………………………………………… 19
3.4.1 Bracket Information ……………………………………………………………………... 20
3.4.2 Installation Steps ………………………………………………………………………… 21
4. Connection –Piping ………………………………………………………………………………….. 23
4.1 Safety ……………………………………………………………………………………………….. 23
4.2 Supply Pressure Condition ……………………………………………………………………….. 23
4.3 Piping Condition ……………………………………………………………………………………. 23
4.4 Connection –Piping with actuator ………………………………………………………………...24
4.4.1 Single acting actuator …………………………………………………………………… 24
4.4.2 Double acting actuator …………………………………………………………………..24
5. Connection –Power ………………………………………………………………………………….. 25
5.1 Safety ……………………………………………………………………………………………... 25
5.2 Terminal Overview ………………………………………………………………………………. 26
5.2.1 Input Signal Terminal …………………………………………………………………. 26
5.2.2 Feedback Signal Terminal …………………………………………………………… 27
5.2.3 Limit Switch Terminal …………………………………………………………………. 27
5.2.4 Ground …………………………………………………………………………………. 28

3 YT-3400/3450 series
6. Adjustment ……………………………………………………………………………………………….29
6.1 Limit Switch Adjustment …………………………………………………………………………… 29
6.2 A/M switch adjustment …………………………………………………………………………… 30
6.3 Variable Orifice Adjustment ………………………………………………………………………. 30
7. Auto Calibration and PCB Operation ………………………………………………………………..31
7.1 Warning……………………………………………………………………………………………….31
7.2 Button Description ………………………………………………………………………………… 31
7.3 Run Mode (RUN) ………………………………………………………………………………….. 31
7.4 Auto Calibration (AUTO CAL) ……………………………………………………………………. 32
7.4.1 AUTO1 Calibration (AUTO1) ………………………………………………………….. 32
7.4.2 AUTO2 Calibration (AUTO2) ………………………………………………………….. 33
7.4.3 AUTO HF Calibration (AUTO HF) …………………………………………………….. 33
7.5 Manual Mode (MANUAL) ………………………………………………………………………… 33
7.6 Parameter Mode (PARAM) ………………………………………………………………………. 34
7.6.1 Dead-Zone (dEAdZONE) ……………………………………………………………… 34
7.6.2 P Value (KP) ………………………………………………………………………….…. 34
7.6.3 I Value (KI) ……………………………………………………………………………….. 35
7.6.4 D Value (Kd) ………………………………………………………………………..…… 35
7.6.5 P_ (KP_), I_(KI_), D_ (Kd_) values………………………………………………..…… 35
7.6.6 KF Value ………………………………………………………………………………… 35
7.7 Hand Calibration Mode (HAND CAL) ……………………………………………………………. 36
7.7.1 Zero-Point (PV_ZERO) and End-Point (PV_END) for Valves ……………………… 36
7.7.2 Zero-Point (TR_ZERO) and End-Point (TR_END) for Transmitter ……………….. 37
7.7.3 Normal / Reverse Feedback Signal (TR_NORM / REV) …………………………… 37
7.7.4 Normal / Reverse HART Signal (HT_NORM / REVS) ……………………………… 38
7.8 Valve Mode (VALVE) ………………………………………………………………………………. 39
7.8.1 Acting Adjustment (ACT RA / dA) ……………………………………………………… 39
7.8.2 Characteristic Adjustment (CHAR) ……………………………………………………. 40
7.8.3 User Characteristics (USER SET) …………………………………………………….. 40
7.8.4 Tight Shut Open (TSHUT OP) …………………………………………………………. 41
7.8.5 Tight Shut Close (TSHUT CL) …………………………………………………………. 41
7.8.6 Split Range Mode (SPLIT) ……………………………………………………………… 41
7.8.7 Custom Zero Setting Mode (CST ZERO) …………………………………………….. 42
7.8.8 Custom End Setting Mode (CST ENd) ……………………………………………….. 42
7.8.9 Interpolation Mode (ITP OFF / ON) …………………………………………………….43
7.8.10 Acting Type (SINGLE / dOUBLE) ……………………………………………………. 43
7.8.11 Lever Type (STd / AdT) …………………………………………………………………. 43
7.9 Diagnostic (dIAGNO) ……………………………………………………………………………….44
7.9.1 PST Introduction ………………………………………………………………………... 44

4 YT-3400/3450 series
7.9.2 PST Mode ……………………………………………………………………………….. 45
7.9.3 PST CFG ………………………………………………………………………………… 45
7.9.3.1 START PO ………………………………………………………………………….. 45
7.9.3.2 TARGET 1 ………………………………………………………………………….. 46
7.9.3.3 TARGET 2 ………………………………………………………………………….. 46
7.9.3.4 INTERVAL ………………………………………………………………………….. 46
7.9.3.5 TOL………………………………………………………………………………….. 47
7.9.3.6 LIMIT TM ………………………………………………………………………….. 47
7.9.3.7 LATENCY ………………………………………………………………………….. 47
7.9.4 PST RSLT ……………………………………………………………………………….. 48
7.10 View Mode (VIEW) …………………………………………………………………………. 49
8. Error and Warning Code ……………………………………………………………………………….51
8.1 Error Code ………………………………………………………………………………………….. 51
8.2 Warning Code ……………………………………………………………………………………… 52
9. Main Software Map …………………………………………………………………………………….. 53

5 YT-3400/3450 series
1. Introduction
1.1 General Information for the users
Thank you for purchasing Young Tech Co., Ltd products. Each product has been fully
inspected after its production to offer you the highest quality and reliable performance.
Please read the product manual carefully prior to installing and commission the product.
The manual should be provided to the end-user.
Any modifications or repairs to the product may only be performed if expressed in this
manual.
The manual can be altered or revised without any prior notice. Any changes in
product’s specification, design, and/or any components may not be printed immediately
but until the following revision of the manual.
When the manual refers to “Valve Zero / Zero” means the final valve position upon
pneumatic pressure has been fully exhausted from positioner’s OUT1 port. The valve
zero position may differ between linear direct and reverse actions. (DA/RA)
The manual should not be duplicated or reproduced for any purpose without prior
approval from Young Tech Co., Ltd, Gimpo-si, South Korea.
1.2 Manufacturer Warranty
For the safety, it is important to follow the instructions in the manual. Manufacturer will
not be responsible for any damages caused by user’s negligence.
Manufacturer will not be responsible for any damages or accidents as a result of any
alteration or modification of the product and its parts. If any alteration or modifications
are necessary, please contact Young Tech Co., Ltd directly.
Manufacturer warrants the product from the date of original purchase of the product for
eighteen(18) months, except as otherwise stated.
Manufacturer warranty will not cover products that have been subjected to abuse,
accidents, alterations, modifications, tampering, negligence, misuse, faulty installation,
lack of reasonable care, repair or service in any way that is not contemplated in the
documentation for the product, or if the model or serial number has been altered,
tampered with, defaced or removed; damages that occurs in shipment, due to act of
God, failure due to power surge, or cosmetic damage. Improper or incorrectly
performed maintenance will void this limited warranty.
For detailed warranty information, please contact the corresponding local Young Tech
Co., Ltd office or main office in South Korea.

6 YT-3400/3450 series
1.3 Explosion Proof Warning
Please ensure the unit is being used and installed within the explosion proof certified
environment.
YT-3400/3450 series are Explosion proof construction for internal pressure.
For detail information, refer to “2.6 Explosion Proof Certifications”
Explosion proof type of cables and gaskets should be used, when explosion gases are
present at the installation site.
Keep cover tight while circuits are alive.
Power should be turned off completely when opening product’s cover. When opening
the cover, ensure that there is no power remaining in any electrical parts nearby.
YT-3400/3450 series have 2 ports for power connection. Explosion proof type wires
and packing should be used. Blind plug is required when any port is not being used.
Cable rug with surface area of more than 0.195mm2with M4 spring washer should be
used to connect the power.
For external ground terminal, cable rug with surface area of more than 5.5mm2should
be used.
Risk of explosion due to electro-static charge. Static electricity charge may develop
when cleaning the product with a dry cloth. It is imperative to avoid static electricity
charge in the hazardous environment.

7 YT-3400/3450 series
2. Product Description
2.1 General
YT-3400/3450 series Smart Valve Positioner accurately controls valve stroke in response to
an input signal of 4-20mA from the controller. Built-in micro-processor optimizes the
positioner’s performance and provides unique functions such as Auto-Calibration, PID
Control, Alarms, and HART Protocol Communications.
2.2 Main Features and Functions
LCD display enables users to monitor the positioner status.
Positioner operates normally during sudden changes in supply pressure and / or high
vibration environment.
The method of Auto Calibration is very simple.
Low air consumption level and low voltage use (8.5 V) yield to lower plant operating
costs. The YT-3400/3450 is compatible with most of controllers.
Variable orifice can be used to minimize the hunting occurrence and optimize operating
conditions.
Valve system becomes more stable by outputting analog feedback signal.
Different valve characteristics can be adjusted –Linear, Quick Open, Equal Percentage,
and Custom which user can make 16 points characterizations.
Tight Shut –Close and Shut - Open can be set.
PID parameters can be adjusted in the field without any additional communicator.
A/M switch can be used to direct supply air to the actuator or to manually operate the
positioner or valve without any signal.
Split range 4-12mA or 12-20mA can be set.
Operating temperature is -40 ~ 85℃(Please check certified explosion proof
temperature)
Hand calibration function can set Zero and Span values.
It has IP66 protection grade.
Epoxy polyester powder coating resists the corrosion process. (YT-3400 series only)
Maintenance of the positioner is easy because of modularized inner structure.

8 YT-3400/3450 series
2.3 Label Description
Fig. 3: YT-3400/3450 Sticker Label.
A. Model: Indicates the model number of the positioner.
B. Suffix: Indicates any options.
C. Serial No.: Indicates unique serial number.
Fig. 4: YT-3400/3450 Stainless steel plate Label
D. Model: Indicates the model number of the positioner.
E. Supply: Indicates the supply pressure range.
F. Amb. Temp.: Indicates the allowable ambient temperature.
G. Input Signal: Indicates input signal range.
H. Protection of Enclosure: Indicates protection grade.
I. Explosion Proof: Indicates certified explosion proof grade.

9 YT-3400/3450 series
2.4 Product Number
YT-3400 series follows suffix symbols as follows.
YT-3400 1 2 3 4 5 6 7 8
1 Motion Type
L :
Linear
R :
Rotary
2 Acting type
S :
Single Acting
D :
Double Acting
3 Explosion Proof
C:
Ex db IIC T5/T6; Ex tb IIIC T100℃/T85℃
4 Feedback Lever
Linear
1 :
2 :
3 :
4 :
10 ~ 40 mm
20 ~ 70 mm
50 ~ 100 mm
100 ~ 150 mm
Rotary
1 :
2 :
3 :
4 :
5 :
M6 x 34L
M6 x 63L
M8 x 34L
M8 x 63L
Namur Standard
5 Connection Type
1 :
2 :
PT 1/4
NPT 1/4
6 Communication
0 :
2 :
None
HART Communication
7 Option
0 :
1 :
2 :
3 :
None
Position Transmitter
Limit Switch
Position Transmitter and Limit Switch
8 Operating Temp.
S :
L :
-30℃~ +85℃
-30℃~ +85℃
※Limit switch: DC 24V and transistor type

10 YT-3400/3450 series
2.5 Product Specification
Model
YT-3400/3450L
YT-3400/3450R
Acting Type
Single
Double
Single
Double
Input Signal
4~20mA DC
Minimum Current Signal
3.2mA(Standard), 3.8mA(Hart Included)
Supply Pressure
0.14~0.7 MPa (1.4~7 bar)
Stroke
10~150 mm
0~90°
Impedance
Max. 450Ω @ 20mA DC
Air Connection
PT, NPT 1/4
Gauge Connection
PT, NPT 1/8
Conduit Entry
PF(G) 1/2
Protection Grade
IP66
Explosion Proof
Ex db IIC T5/T6; Ex tb IIIC T100℃/T85℃
Ambient Temperature
T5
-40/-20℃~ 70℃(-40/-4℉~ 158℉)
T6
-40/-20℃~ 80℃(-40/-4℉~ 176℉)
Linearity
±0.5% F.S.
Hysteresis
0.5% F.S.
Sensitivity
±0.2% F.S
Repeatability
±0.3% F.S.
Flow Capacity
70 LPM (Sup.=0.14 MPa)
Air Consumption
0.01 LPM (Sup.=0.14 MPa @ idle)
Output Characteristic
Linear, Quick Open, EQ%, User Set (16 point)
Vibration
No Resonance upto 100Hz @ 6G
Humidity
5-95% RH @ 40℃
Communication (Option)
HART Communication
Feedback Signal (Option)
4~20mA (DC 10~30V)
Material
Aluminum (YT-3400) / Stainless stee 316 (YT-3450)
Weight
3.4kg (YT-3400) / 7.0 kg (YT-3450)
Painting
Epoxy Polyester Powder Coating (YT-3400)
Tested under ambient temperature of 20’C, absolute pressure of 760mmHg, and humidity of 65%. Please contact
Young Tech Co., Ltd for detailed testing specification. * Explosion proof certification is in progress.

11 YT-3400/3450 series
2.6 Explosion Proof Certifications
KC (Korea, YT-3400 Only)
Type : Explosion proof construction for internal pressure
Rating : Ex d IIC T5/T6 IP66
Certification No. : 10-KB2BO-0077
Ambient temperature : -40~+70℃(T6), -40~+85℃(T5)
ATEX
Type : Explosion proof construction for internal pressure
Rating : II 2G Ex db IIC T5/T6, II 2D Ex tb IIIC T85℃/T100℃
Certification No. : EPS 11 ATEX 1 308 X
Ambient temperature : -20~+70℃T6(T85℃), -20~+80℃T5(T100℃)
IECEx
Type : Explosion proof construction for internal pressure
Rating : Ex db IIC T5/T6, Ex tb IIIC T85℃/T100℃
Certification No. : IECEx EPS 11.0002X
Ambient temperature : -20~+70℃T6(T85℃), -20~+80℃T5(T100℃)
CSA
Type : Explosion proof construction for internal pressure
Rating : Ex db IIC T5 or T6
Class I, Zone 1, AEx db IIC T5 or T6
Class II, Division 1, Groups E, F and G; Ex tb IIIC T85℃/T100℃
AEx tb IIIC T85℃/T100℃
Certification No. : 2541710
Ambient temperature : -20℃to +70℃(T6), -20℃to +80℃(T5)
FM
Type : Explosion proof construction for internal pressure
Rating : Ex db IIC T5/T6, Ex tb IIIC T85℃/T100℃
XP/I/1/BCD/T6 Ta = -40℃to +80℃
DIP/II, III/1/EFG/T6/Ta = -40℃to +80℃; IP66
I/1/AEx db IIC T5 Ta = -40/-20℃to +80℃
I/1/AEx db IIC T6 Ta = -40/-20℃to +70℃
21/AEx tb IIIC T85℃/T100℃
T6 Ta = -40/-20℃to +70℃
T5 Ta = -40/-20℃to +80℃; IP66
Original Project ID : 3053561
Ambient temperature : (T6) -40℃to +70℃, (T5) -40℃to +80℃

12 YT-3400/3450 series
2.7 Parts and Assembly
Fig. 5: YT-3400/3450 series exploded view
1. Pilot Cover 6. Potentiometer
2. Pilot Unit 7. Main Body
3. Main Cover 8. Terminal PCB
4. Main PCB 9. Terminal Cover
5. Feedback Lever 10. Manifold
Fig. 6: Location of drain plug according to orientation of positioner’s mounting
YT-3400/3450 series have two drain ports to be used for internal condensation. Please use
larger drain plug for the condensation and block other remaining port with blind plug.
1
2
3
10
4
5
6
7
8
9
Drain Plug

13 YT-3400/3450 series
2.8 Product Dimension
2.8.1
Fig. 7: YT-3400L Fig. 8: YT-3450L
2.8.2
Fig. 9: YT-3400R (Fork lever type) Fig. 10: YT-3450R (Fork lever type)

14 YT-3400/3450 series
2.8.3
Fig. 11: YT-3400R (Namur type) Fig. 12: YT-3450R (Namur type)

15 YT-3400/3450 series
3. Installation
3.1 Safety
When installing a positioner, please ensure to read and follow safety instructions.
Any input or supply pressures to valve, actuator, and / or to other related devices must
be turned off.
Use bypass valve or other supportive equipment to avoid entire system “shut down”.
Ensure there is no remaining pressure in the actuator.
※Installed in accordance with the National Electrical Code(NEC), ANSI/NFPA 70, or
CEC Part 1 as applicable.(FM approved product)
3.2 Tools for installation
Hexagonal wrench
Screw drivers (+) & (-)
Spanners for hexagonal-head bolts
3.3 YT-3400/3450L Installation
YT-3400/3450L should be installed on linear motion valves such as globe or gate type which
uses spring return type diaphragm or piston actuators. Before proceeding with the
installation, ensure following components are available.
Postioner main body
Feedback lever and lever spring
M6 nut and spring washer (fastening feedback lever to a main shaft of positioner)
4 pcs x bolts (M8 x 1.25P) –not supplied with the unit
4 pcs x M8 plate washer –not supplied with the unit
Fig. 13: YT-3400/3450L installation example

16 YT-3400/3450 series
3.3.1 Installation Steps
1. Proper bracket must be made in order to adapt the positioner on the actuator yoke.
Please consider following important points when a bracket is being designed.
Positioner’s feedback lever must be vertical to the valve stem at 50% of the valve
stroke.
The connection bar of the actuator clamp for the feedback lever should be installed
in such a way that the valve stroke length coincides with the corresponding figure in
“mm”marked on the feedback lever. Improper setting may cause poor linearity and
may create unnecessary hunting during the operation.
2. Assemble the positioner with the bracket made in previous step by fastening the bolts.
Please refer to the backside of the positioner for size of the bolts. The standard bolt
size is M8 x 1.25P. Please contact Young Tech Co., Ltd for other bolt sizes.
Fig. 14: YT-3400/3450L with bracket Fig. 15: Attaching bracket to actuator yoke
3. Attach the positioner with bracket to the actuator yoke –DO NOT TIGHTEN THE
BRACKET COMPLETELY.
4. Connect positioner’s feedback lever to the connection bar of the actuator clamp. The
hole gap on the feedback lever is 6.5mm. The connection pin’s outer diameter should
be less than 6mm.
5. Connect supply pressure to the actuator temporarily. Supply enough supply pressure to
the actuator in order to position the actuator clamp at 50% of the total valve stroke.

17 YT-3400/3450 series
6. Insert connection bar into the feedback lever. The bar should be inserted when the
actuator clamp is at 50% of the total valve stroke.
Fig. 16: Proper way to connect feedback lever, connection bar, and lever spring by connecting pneumatic
pressure to actuator to position the valve at 50%
7. Check if feedback lever is vertical to the valve stem at 50% of the valve stroke. If it is
not vertical, adjust the bracket or the connection link bar to make vertical. Improper
installation may cause poor linearity and may create unnecessary hunting during the
operation.
Fig. 17: Feedback lever and valve stem
8. Check the valve stroke. The stroke numbers are engraved on the feedback lever of the
positioner. Position the connection bar at the number on the feedback lever which
corresponds with the desired valve stroke. To adjust, move the bracket, the connection
bar or both.
Stroke : 30mm
Stroke : 70mm
Fig. 18: Feedback lever and location of the connection bar

18 YT-3400/3450 series
9. After installing the positioner, operate the valve from 0% to 100% stroke by using direct
air to the actuator. On both 0% and 100%, the feedback lever should not touch the
lever stopper, which is located on the backside of the positioner. If the feedback lever
touches the stopper, the positioner should be installed further away from the yoke.
Fig. 19: Feedback lever should not touch lever stopper on 0% ~ 100% valve stroke.
10. After the installation, tighten all of the bolts on the bracket, the feedback lever, and the
connection bar.

19 YT-3400/3450 series
3.4 YT-3400/3450R Installation
YT-3400/3450R should be installed on rotary motion valve such as ball or butterfly type
which uses rack and pinion, scotch yoke or other type of actuators which its stem rotates 90
degrees. Before proceeding with the installation, ensure following components are
available.
Positioner main body
Fork lever and lever spring
Standard rotary bracket set (2 piece, included with the positioner)
4 pcs x hexagonal headed bolts (M8 x 1.25P)
4 pcs x M8 plate washers
4 pcs x wrench headed bolts (M6 x 1P)
4 pcs x M6 nuts
4 pcs x M6 spring washers
Fig. 20: Fork lever type Fig. 21: NAMUR lever type

20 YT-3400/3450 series
3.4.1 Bracket information
Standard bracket (included with the positioner) contains two components. The bracket can
be used for both fork lever and NAMUR lever type. The bracket is designed to fit onto the
actuator with 20mm, 30mm and 50mm stem height (H) according to VDI/VDE 3845 standard.
Please refer to below table how to adjust the height of the bracket.
Actuator stem
height (H)
Markings of bolt holes
A-L
B-L
A-R
B-R
20mm
H : 20
H : 20, 30
H : 20
H : 20, 30
30mm
H : 30
H : 20, 30
H : 30
H : 20, 30
50mm
H : 50
H : 50
H : 50
H : 50
Fig. 22: Brackets of rotary type positioner