Unox U-EPRSeries User manual

Electro-pneumatic Positioners
U-EPR Series
USER'S MANUAL
Ver 1.02

Electro-Pneumatic Positioners
Table of Contents
Introduction 2
Manufacturer Warranty 2
Product Description 3
Main Features and Functions 3
Operation Logic 3
Label Description 3
Suffix Symbols 4
Specification 5
Parts and Assembly 6
Dimensions 6
Installation 7
Safety Warning 7
Tools for Installation 7
U-EPR Installation 7
Using Brackets to Install 8
Connection 11
Connection - Piping 11
Power Connection - Explosion-Proof Type 12
Adjustment 14
Adjustment - Zero Point 14
Adjustment - Span 14
Adjustment - Auto/Manual Switch 15
Adjustment - Seat Adjuster 15
Adjustment - Orifice 16
Maintenance - Pilot Valve 16
Troubleshooting 17
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Electro-Pneumatic Positioners
Product Description
Main Features and Functions
It is designed for high durability and performance in high vibration environment.
Durability has proven after testing of 1 million times minimum.
Response time is very short and accurate.
Simple part change can set 1/2 SplitRange.
It is economical due to lessair-consumption.
Direct/Reverse action can be set easily.
Zero & Span adjustment process is simply.
Feedback Connection is easy.
Operation Logic
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<Figure 1>
If supply pressure increased, Flapper(②) gets pushed by the force from torque-motor(①). As
the gap between flapper(②) and the nozzle(③) increases, air pressure exhausts from
pilot valve(④) and upper spool(⑤). As a result, spool(⑤) rises. Then the air pressure
will be supplied to the actuator(⑩). As actuator(⑩) moves, the cam(⑭) receives
the
movement. This movement pulls the span spring(⑮). <Figure1>
Label Description
Model Number:
Explosion Proof:
Input Signal:
Ambient Temperature:
Supply Pressure:
Serial Number:
Indicates model name and any options (if any).
Indicates explosion proof grade.
Indicates current input signal range.
Indicates ambient temperature for normal operation.
Indicates the range of supply pressure.
Indicates unique serial number.

Electro-Pneumatic Positioners
Suffix Symbol
U-EPR series follows suffix symbols as follows.
U-EPR
════════════════════════════════
Motion Type S : Single
D : Double
════════════════════════════════
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Explosion Proof m : ExdmIIBT5
C : ExdmIICT5
i : ExiaIIBT6 or ExiaIICT6(NEPSI)
n : Non-Explosion
════════════════════════════════
Feedback Lever 1 : M6X40L
2 : M6X63L
3 : M8X40L
4 : M8X63L
5 : NAMUR
════════════════════════════════
Orifice 1 : Ø1
2 : Ø2
3 : None
════════════════════════════════
Connection Type 1 : PT
2 : NPT
════════════════════════════════
Ambient Temperature S : -20 ~ 70℃
H : -20 ~ 120℃L
: -40 ~70℃
════════════════════════════════
Option 1 0 : Standard
1 : Dome Indicator
════════════════════════════════
Option 2 1 : None
2 : + PTM Internal
3: + PTM External (explosion proof) 3 :
+ L/S Internal
4 : + L/S External (explosion proof) 5
: + PTM + L/SInternal
6 : + PTM + L/S External (explosion proof)
════════════════════════════════
* For special specification, please contact our salesdepartment.

Electro-Pneumatic Positioners
Category U-EPR
Single Double
Input Signal 4~20mA DC *1
Impedance 250±15Ω
Supply Pressure 1.4~7.0kgf/cm2(20~100 psi)
Stroke 0~900 *2
Air Connection PT(NPT) 1/4
Gauge Connection PT(NPT) 1/8
Conduit Entry PF 1/2 or G 1/2
Explosion Proof *3
Domestic: ExdmIIBT5, ExdmIICT5, ExiaIIBT6
ATEX: EExmdIIBT5, JIS : ExsdIIBT5
CSA : ExmdIIBT5, NEPSI : ExiaIICT6
Protection IP66
Ambient
Temperat
ure
Operating Standard:-20∼70℃,
Low: -40∼70℃High: -20∼120℃
Explosion -20~60℃(T5), -20~40℃(T6)
Linearity ±1.0% F.S
Hysteresis 1.0% F.S
Sensitivity ±0.2% F.S ±0.5% F.S
Repeatability ±0.5% F.S
Air Consumption 3LPM (Sup=1.4kgf/cm2,20psi)
Flow Capacity 80LPM (Sup=1.4kgf/cm2,20psi)
Material Aluminum Diecasting
Weight 2.7kg(6.1lb)
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Specification
*Tested under ambient temperature of 20℃, absolutepressureof 760mmHg, and humidityof 65%.
Please contact us formoredetailed specification.
*1: For 1/2 Split Control,it can be applied by adjustingzero andspan.
*2: For inquiryregarding strokes under 10mm or above 150mm,
* U-EPR has differenttypes of explosionproofcertificates. Please make sure to check explosionproof
grade.

Electro-Pneumatic Positioners
Parts and Assembly
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Dimensions
<
Explosion-prooftype U-EPR >

Electro-Pneumatic Positioners
<Intrinsically safe type U-EPR >
Installation
Safety Warning
When installing positioner, please ensure to read and follow safety instruction.
All input and supply pressure to valve, actuator, and other related devices must be turned
off.
Use bypass valve or other equipment to avoid entire system "shut down."
Make sure there is no remaining pressure in the actuator.
Tools for installation
①Hexagonal wrench
②Screw drivers (+) & (-)
③Spanners for hexagonal-head bolts
installation
U-EPR should be installed on rotary motion valve such as ball valve or butterfly valve
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Before installation, be sureto
using spring return type diaphragm or piston actuator. check
for following installation components.
①U-EPR main body
②Feedback lever and lever spring
③Flange nut
④4 pcs. of hexagon head bolts (M8 X 1.25P)
⑤4 pcs. of M8 platewasher

Electro-Pneumatic Positioners
Installation Steps
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<Figure 2: Using Fork TypeLever> <Figure 3: Using NAMUR Shaft>
Using Bracketsto Install
U-EPR is provided with standard bracket. This bracket contains three parts, and
brackets can be used for both fork type lever and NAMUR Shaft.
<Figure 4: Assembly Methodby stem height "H">
1) In general, the height of an actuator (H) is 20, 30, or 50mm. Please check using
acutator stem height and assemble bracket according to <Figure 4>.
Stem Height (H)
Actuator
<Figure 5: Measuring Stem Height(H)>

Electro-Pneumatic Positioners
2) Attach bracketed U-EPR to the actuator by using hexagon-headed and wrench bolts. Size
of the bracket hole is 6mm. When tightening bolts, use spring washer or
similar for firm attachment to the actuator, so U-EPR will not shake by vibration or any other
impact. The direction of bracket is different by the operating condition, but normally, the
positioner is installed as shown in <Figure 6>.
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<Figure 6>
3) Set rotation position of the actuator stem at zeropoint, "0%". For a single type of
actuator, it is easy to check zero point, because the actuator stem is positioned at zero point
when there is no supply pressure. If double acting actuator is used, check
actuator stem's rotation direction (clockwise or counter-clockwise) by supplying pressure.
4) Install the fork lever as shown in <Figure 7> after setting actuator stem at zero point. Check
the direction of the actuator stem - clockwise or counter-clockwise. Installation angle of the
fork lever should be 45 degrees based on the linear shaft. For NAMUR shaft, the angle does
not matter.
Counter-Clockwise Clockwise
<Figure 7>

Electro-Pneumatic Positioners
5) After setting fork lever position, lock nuts which are assembled on the bottom of the fork lever.
Make sure to set upper height of the fork lever between 6-11mm, which is lower than upper
bracket height. <Figure8>
6-11mm
Fork Lever Actuator
<Figure 8>
6) Attach YT-1000R to the bracket. Fix the clamping pin on the main shaft's center of U-EPR and
insert connection bar into the fork lever slot, so it can be locked to the fork lever spring. This
sets the alignment of the main shaft of U-EPR and center of the actuator stem.
Bad alignment of the main shaft and the actuatorstem lowers U-EPR
s durability, because too much force will be on the main shaft of U-EPR.
<Figure 9>
<Figure 9>
7) Tighten U-EPR base and the bracket with hexagon-headed bolts and plate washer. It is
recommended to tighten four bolts after checking U-EPR 's position. <Figure 10>
<Figure 10>
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