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Table of Contents
Summary of Contents for Unox U-EPRSeries
- Page 1 Electro-pneumatic Positioners U-EPR Series USER'S MANUAL Ver 1.02...
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Page 2: Table Of Contents
Electro-Pneumatic Positioners Table of Contents Introduction Manufacturer Warranty Product Description Main Features and Functions Operation Logic Label Description Suffix Symbols Specification Parts and Assembly Dimensions Installation Safety Warning Tools for Installation U-EPR Installation Using Brackets to Install Connection Connection - Piping Power Connection - Explosion-Proof Type Adjustment Adjustment - Zero Point... -
Page 3: Product Description
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. ... -
Page 4: Suffix Symbols
Electro-Pneumatic Positioners Suffix Symbol U-EPR series follows suffix symbols as follows. U-EPR ════════════════════════════════ Motion Type S : Single D : Double ════════════════════════════════ m : ExdmIIBT5 Explosion Proof C : ExdmIICT5 i : ExiaIIBT6 or ExiaIICT6(NEPSI) n : Non-Explosion ════════════════════════════════ Feedback Lever 1 : M6X40L 2 : M6X63L 3 : M8X40L... -
Page 5: Specification
Electro-Pneumatic Positioners Specification U-EPR Category Single Double Input Signal 4~20mA DC Impedance 250±15Ω Supply Pressure 1.4~7.0kgf/cm (20~100 psi) Stroke 0~90 Air Connection PT(NPT) 1/4 Gauge Connection PT(NPT) 1/8 Conduit Entry PF 1/2 or G 1/2 Domestic : ExdmIIBT5, ExdmIICT5, ExiaIIBT6 ATEX: EExmdIIBT5, JIS : ExsdIIBT5 Explosion Proof... -
Page 6: Parts And Assembly
Electro-Pneumatic Positioners Parts and Assembly Dimensions < Explosion-proof type U-EPR > - 6-... -
Page 7: Installation
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." ... -
Page 8: Using Brackets To Install
Electro-Pneumatic Positioners Installation Steps <Figure 2: Using Fork Type Lever> <Figure 3: Using NAMUR Shaft> Using Brackets to 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 Method by stem height "H">... - Page 9 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.
- Page 10 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. <Figure 8> 6-11mm Fork Lever Actuator...
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Page 11: Connection
Electro-Pneumatic Positioners Connection Connection - Piping Note To avoid entering moisture, oil, or dust into the product, please carefully make selection of supply pressure compressor. It is recommended to attach air filter regulator before supply port of U-EPR. Supply Pressure Condition ①... -
Page 12: Power Connection - Explosion-Proof Type
Electro-Pneumatic Positioners Double acting actuator For U-EPR series double acting type, when inputting current signal, supply pressure is out from OUT1. Please refer to <Figure 12> <Figure 13: Cam adjustment and piping connection> Power Connection - Explosion-Proof Type Connection - Connection Port (1) Connection port size is PF1/2 or G1/2. - Page 13 Electro-Pneumatic Positioners Connection - Cable Gland ① Use certified explosion proof products. ② End of cable must be crimp style terminal. Please refer to below table. <Figure 15> <Figure 15> ③ Insert the terminal connection into terminal box and lock completely. ④...
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Page 14: Adjustment
Electro-Pneumatic Positioners Connection - Ground ① Open positioner's body cover. ② Locate poles connect them properly. <Figure 17> <Figure 17> Adjustment Adjustment - Zero Point ① Set supply signal at 4mA or 20mA and rotate adjuster clockwise or counter-clockwise to adjust actuator's initial point. -
Page 15: Adjustment - Auto/Manual Switch
Electro-Pneumatic Positioners Adjustment - A/M Switch (Auto/Manual) ① A/M switch adjusts the valve operation to automatic or manual. ② When produced, U-EPR is set at "A(Automatic)". If user prefers the positioner's setting as "M(Manual)," the setting can be changed by turning the switch counter-clockwise. -
Page 16: Adjustment - Orifice
Electro-Pneumatic Positioners Adjustment - Orifice ① If the size of actuator is too small relative to the flow rate, positioner can have hunting. In order to avoid hunting, orifice can be used. There are three types of the orifice. Actuator Size Orifice Size Suffix Symbol 90 cm... -
Page 17: Troubleshooting
Electro-Pneumatic Positioners TROUBLESHOOTING ▶ Positioner does not respond to the input signal. (4) Check supply pressure level. The lever must be at least 1.4 kgf/cm spring-return type of actuator, the supply pressure level has to be larger than the spring's specification. (5) Check if input signal is properly supplied to the positioner. - Page 18 Electro-Pneumatic Positioners unstable, the regulator must be replaced. ▶ Hysteresis is too low. (1) In case of double acting actuator, check if seat adjustment has been properly performed. Please contact YTC for any further inquiries regarding the seat adjustment. (2) Backlash can occur when the feedback lever and lever spring are loosen. To avoid backlashing, please adjust the lever spring.