YT-720 SERIES PRODUCT MANUAL YT-720S YT-720D Rotork YTC Limited VERSION 1.07
Contents 1. Introduction... 3 1.1 General Information for the users... 3 1.2 Manufacturer Warranty... 3 1.3 Explosion Proof Warning... 4 2. Product Description... 5 2.1 General... 5 2.2 Main Features and Functions... 5 2.3 Label Description... 5 2.4 Product Code... 6 2.5 Product Specification... 6 2.6 Certifications... 7 2.7 Parts and Assembly... 7 2.8 Product Dimension... 9 3. Operating Logic... 10 3.1 YT-720S... 10 3.2 YT-720D... 11 4. Installation... 12 4.1 Safety and Installation Tips... 12 4.2 Tools for installation... 12 5. Connection Power... 14 5.1 Safety... 14 5.2 Coil body and Rotator... 15 5.3 Connection of terminal... 16 6. Connection - Air... 17 6.1 Safety... 17 6.2 Supply Pressure Condition... 17 6.3 Piping Condition... 17 6.4 Connecting piping of YT-720S... 18 6.5 Connecting piping of YT-720D... 19 7. Maintenance... 20 8. Troubleshooting and repair... 21 Ver. 1.07 2
1 Introduction 1.1 General Information for the users Thank you for purchasing Rotork YTC Limited 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 commissioning the product. Installation, commissioning, and maintenance of the product may only be performed by trained specialist personnel who have been authorized by the plant operator accordingly. The manual should be provided to the end-user. 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. The manual should not be duplicated or reproduced for any purpose without prior approval from Rotork YTC Limited, Gimpo-si, South Korea. In case of any other problems that are not stated in this manual, please make immediate contact to Rotork YTC Limited. This product is an accessory of the control valve, so please make sure to read the applicable instruction manual of the control valve or other equipment prior to installation and operation. 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. Any modifications or repairs to the product may only be performed if expressed in this manual. Injuries and physical damages caused by customer s modifying or repairing the product without a prior consultation with Rotork YTC Limited will not be compensated. If any alterations or modifications are necessary, please contact Rotork YTC Limited directly. The warranty period of the product is (18) months from the date of shipment unless stated otherwise. Date of shipment can be checked by providing the LOT NO. or SERIAL NO. to us. 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 Rotork YTC Limited office or main office in South Korea. Ver. 1.07 3
1.3 Explosion Proof Warning Please ensure the unit is being used and installed in conformity with local, regional, and national explosion proof certified environment. YT-720 is Explosion proof construction for internal pressure. For detail information, refer to 2.6 Certifications Explosion proof type of cables and gaskets should be used, when explosion gases are present at the installation site. Please make sure that the sealing has been done completely. 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. Three ring terminals are already assembled on the power connection. Be sure to use this ring terminal when connecting wires. There are two ground terminals inside and outside of the product. Use the supplied ring terminal even when wiring to the ground terminal There is 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. If cleaning the surface of the product is needed, must use wet clothes. Ver. 1.07 4
2 Product Description 2.1 General The YT-720S (3 Way) and YT-720D (4 Way) series of explosion-proof solenoid valves are designed to output the pneumatic pressure input to the valve by DC or AC voltage signal (YT-720D: Switch output port direction) 2.2 Main Features and Functions Designed to be flameproof enclosure. Manual switch allows to carry-out operational test even when there is no voltage power connected. It is convenient to attach the power cable from the field as the conduit entrance can be rotated (265 degrees). In addition, the coil body itself can rotate 360 degrees, making installation easy. In case of YT-720D, valve body is operated by pneumatic operation instead of spring return type, so operation is very smooth with high durability regardless of supply pressure. With Namur type design, it can be attached directly to the actuator. Product surface is anodized and therefore, corrosion resistance is excellent. 2.3 Label Description Fig. L-1: Sticker label MODEL : Indicates the model number and additional symbols. EXPLOSION PROOF : Indicates certified explosion proof grade. RATING : Indicates allowable voltage and current. AMBIENT TEMPERATURE : Indicates allowed explosion proof ambient temperature range. AIR SUPPLY : Indicates allowed supply air pressure range. LOT NO. : Indicates unique lot number. YEAR.MONTH : Indicates manufactured year and month. Precautions Be careful not to apply volatile solvent (hardener of instant adhesive, acetone, WD-40, etc.) to the sticker nameplate. Printed contents may be erased. Ver. 1.07 5
2.4 Product Code YT-720 1 2 3 4 1 Valve type S : D : 2 Air Connection Type P : N : 3 Power Source 1 : 2 : 3 : 4 Air Pressure 1 : 2 : 3 : 3 Way 4 Way PT 1/4 NPT 1/4 AC 110V AD 220V DC 24V 0 ~ 0.4 MPa (3 Way) 0 ~ 0.7 MPa (3 Way) 0.1 ~ 1 MPa (4 Way) 2.5 Product Specification Model YT-720S YT-720D Air Pressure Range 0 ~ 0.4 MPa 0 ~ 0.7 MPa 0.1 ~ 1 MPa Flow Capacity(Cv) 0.2 0.084 0.75 AC 110V 130 ma (12 W) Rating Current AC 220V 60 ma (11 W) DC 24V 580 ma (14 W) Frequency Explosion Proof 50 ~ 60 Hz Ex d IIC T6 (KCs) Air Connection PT 1/4 or NPT 1/4 Conduit Entry G 1/2 Coil Insulation Grade Class F Ambient Temperature Operating -20 ~ 70 (-4 ~ 158 ) Explosion Proof -20 ~ 50 (-4 ~ 122 ) Housing Material Aluminum Diecasting Weight 0.86kg (1.9 lb) 1.3kg (2.8 lb) Tested under ambient temperature of 20 C, absolute pressure of 760mmHg, and humidity of 65%. Please contact Rotork YTC Limited for detailed testing specification. Ver. 1.07 6
2.6 Certifications All certifications below are posted on Rotork YTC Limited homepage(www.ytc.co.kr). KCs (Korea) Type : Explosion proof construction for internal pressure Rating : Ex d IIC T6 Certification No. : 15-KB2BO-0133 Ambient temperature : -20 ~ +50 Electromagnetic Compatibility (EMC) - EMC directive 2014/30/EC from April 2016 - EC Directive for CE conformity marking 2.7 Parts and Assembly Fig. 2-1: YT-720S exploded view Ver. 1.07 7
Fig. 2-2: YT-720D exploded view Ver. 1.07 8
2.8 Product Dimension Fig. 2-3: YT-720S Fig. 2-4: YT-720D Ver. 1.07 9
3 Operating Logic 3.1 YT-720S As signal pressure is being supplied, the 6plunger rises and creates a secondary gap between the 9nozzle and 6plunger which results in primary air pressure exhaustion. When signal pressure has been turned off, the 6plunger moves downward and blocks the channel. At the same time, the air pressure will exhaust through the channel between the 6plunger, 2vent, and 1body cap. Fig. 3-1: YT-720S Section Ver. 1.07 10
3.2 YT-720D When the signal voltage is given, the 6plunger rises up due to the electromagnetic force generated by the voltage, so that the lower part of the 9nozzle and the 6plunger are opened and the passage to the upper part of the spool in the valve opens. The spool is pushed down and the primary supply pressure is output to the C2 port. When the signal voltage is again interrupted, the plunger falls down and the nozzle is closed, and the air pressure in the upper part of the spool is released to the atmosphere through the 6plunger internal flow path. The spool is raised by the gap difference and primary supply pressure is output to the C1 port. 그림 3-2: YT-720D Section Ver. 1.07 11
4 Installation 4.1 Safety and Installation Tips When installing the unit, please ensure to read and follow safety instructions. Follow other explosion proof procedures and safety precautions. In case of hazardous area, please ensure there is no explosion gas in the atmosphere. 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. 4.2 Tools for installation Hex key set for hex socket cap bolts (+) & (-) Screw drivers Spanners for hexagonal-head bolts 4.3 Manual Switch The valve can be operated without the electric signal by using the manual switch. The manual switch can be adjusted with tools such as flat screwdrivers. When the product is shipped from the factory, the manual switch is set to the automatic position (A), meaning the position where the valve is opened or closed by a normal electrical signal. YT-720S: When the manual switch is switched to the manual position (M), the valve is forcibly opened without electrical signal. (IN OUT) YT-720D: When the manual switch is in the automatic position (A), if an electric signal is input, pneumatic pressure flows from IN C2, and if the electric signal is blocked, pneumatic pressure flows from IN C1. But when the manual switch is switched to the manual position (M), air pressure flows through IN C2 without electrical signal. Be sure to switch to automatic position (A) during normal operation. Be careful not to overturn the manual switch with excessive force as it could damage the switch. Ver. 1.07 12
Fig. 4-1: Auto Manual Switch Fig. 4-2: 720D Flow direction according to position of auto manual switch without electric signal. Ver. 1.07 13
5 Connection Power 5.1 Safety When installing a unit, please ensure to read and follow safety instructions. When installing in hazardous and explosive gas area, conduit tube or pressure-proof packing union must be used. The compound charging box should be the flameproof type and must be sealed completely. Conduit entry connection tap is G 1/2. Before connecting terminal, ensure that the power is off completely. Do not open the cover when the power is still alive. Please use ring terminal to protect against vibration or any other external impact. The product should be grounded at outside or inside terminals of the product. Please use twisted cable with conductor section are 1.25mm 2 and that is suitable for 600V (complying with the conductor table of NEC Article 310). The outer diameter of the cable should be between 6.35 ~ 10mm. Use shield wire to protect against electro-magnetic field and noise. Please do not install the cable near high noise equipment, such as high-capacity transformer or motor. Please use shielded cable if necessary. Fig. 5-1: Pressure-proof packing union Fig. 5-2: Flame proof type compound charge box Ver. 1.07 14
5.2 Coil body and Rotator The coil part rotates 360 degrees and the rotator, which is the conduit entrance, can be turned in a range of 265 to a convenient position for operation. Fig. 5-3: Rotation of YT-720S Coil body Fig. 5-4: Rotation of YT-720D Coil body Fig. 5-5: Rotation of Rotator Ver. 1.07 15
5.3 Connection of terminal 1. Loosen the Rotator Lock Bolt and rotate the Rotator to the desired position 2. Open the Rotator Cover, connect the ground using the grounding bolt (E indicator), and connect the power terminal in the same way. At this time, the polarity of the terminal can be connected without distinguishing + and for both AC or DC. Be sure to connect to the ring terminal supplied from the terminal. 3. Close the Rotator Cover and tighten the Rotator Lock Bolt. Fig. 5-6: Connecting terminals Ver. 1.07 16
6 Connection - Air 6.1 Safety Supply pressure should be clean and dry air avoiding moisture, oil and dust. Always recommended to use air filter regulator (i.e. YT-200 series). Do not disassemble the product without prior consultation with manufacturer. If disassembling is inevitable, please contact Young Tech Co.,Ltd or your dealer. Rotork YTC Limited has not tested positioner s operation with any other gases other than clean air. Please contact Rotork YTC Limited for any questions. 6.2 Supply Pressure Condition Dry air with dew point of at least 10 lower than ambient temperature. Avoid from dusty air. If require, we recommend to use air filter regulator which contains 5 micron or lower filter (YT-200) Avoid oil. Comply with ISO 8573-1 or ISA 7.0.01. Use within the range of pneumatic pressure specified in the product specification. When solenoid valve is used on an actuator, set the pressure output from the regulator to 10% higher than the operating pressure of the actuator or the spring range pressure of the actuator 6.3 Piping Condition Ensure inside of pipe is clean of obstructions. Do not use pipeline that is squeezed or shows any type of damamges. Ver. 1.07 17
6.4 Connecting piping of YT-720S Fig. 6-1: Installation example by piping and without mounting bracket Fig. 6-2: Installation example Ver. 1.07 18
6.5 Connecting piping of YT-720D If the exhaust ports E1, E2 are completely blocked, the product will not operate. If you do not use it as a double-action type, you can use it as a single-action type by blocking the unnecessary ports of the output ports C1 or C2. At this time, exhaust ports E1 and E2 should all be open. Fig. 6-3: Installation example by piping and without mounting bracket Fig. 6-4: Example of YT-720D on an actuator Fig. 6-5: Installation example Ver. 1.07 19
7 Maintenance There are coil assembly and valve that can be replaced during maintenance in the solenoid valve. Solenoid valve s valve and coil assembly can be easily disassembled from the field. However, if this has affection on explosion proof performance, do not disassemble the coil assembly or valve, and then replace the YT-720 itself or remove the product from the site and ask for repair from the supplier or the manufacturer. Please observe the safety instructions of the site and the safety instructions of this manual to avoid any damages to the product and injuries during maintenance. Fig. 7-1: YT-720S Fig. 7-2: YT-720D Ver. 1.07 20
8 Troubleshooting and repair 1) No response from the plunger after input signal has been supplied. Please check that the signal voltage matches the rated voltage of the product. If the signal voltage differs from the rated voltage, match the signal voltage to the rated voltage. Please check the resistance between (+) and (-) poles. If the resistance is too high, the coil must have been burnt. 2) Plunger operates but no output air when input signal has been supplied. Please check if supply pressure from the regulator is stable. Following is only for YT-720D Check that the supply pressure from the regulator is less than 0.12 MPa. If the supply pressure is too low, the spool inside the valve will not operate. Check that the exhaust port is not blocked. In both cases of single acting and double acting actuators, the exhaust port should not be blocked. Check that the output port to be used is not blocked. Check that the spool in the valve body is fixed. If there is no problem, it is highly likely that the spool is fixed when there is no output of the supply pressure even if the manual switch is manually operated and the plunger is forcibly moved. 3) Air pressure outputs from C1 when there is no input signal. Please check if switch is at automatic (A) position. Check that the supply pressure from the regulator is less than 0.12 MPa. If the supply pressure is too low, the spool inside the valve will not operate. Ver. 1.07 21
Manufacturer: Rotork YTC Limited Address: 81, Hwanggeum-ro, 89 Beon-gil, Yangchon-eup, Gimpo-si, Gyeonggi-do, South Korea Postal code: 10048 Tel: +82-31-986-8545 Fax: +82-70-4170-4927 Email: ytc.sales@rotork.com Homepage : http://www.ytc.co.kr Issued : 2019-03-25 Copyright Rotork YTC Limited. All Rights Reserved. Ver. 1.07 22