Moog Valves - Moog, Inc. - Precision motion control ...

1 D680 SeriesProportional control Valveswith Integrated Electronics ISO 4401 Size 05 to 102 Moog D680 SeriesGENERALD681 - D685 PROPORTIONAL control Valves , D681 TO D685 SERIESThe D680 Series Proportional Flow control Valves are throttlevalves for 2-, 3-, 4- and 5-way Valves are suitable for electrohydraulic position, velocity,pressure or force control systems, including those with highdynamic response the new D633 Series directly driven pilot valve (DDV), afurther important step has been made in the direction of robust-ness and energy saving. This linear force motor driven pilot valveis developed as a variant of the proven Moog DDV integrated electronics of the D680 series is also a new development featuring SMD technology, and requires 24 V DCpower valve series described in this catalog have successfullypassed EMC tests required by EC Directive. Please refer to therespective references in the Electronics PAGEG eneral2 Benefits and Functionality3 General Technical Data and Symbols4 Function, Electronic5 Technical Data8 Valve Electronics28 Failsafe Version32 Input Command Wiring Schematic40 Ordering Information41 NOTICE Before installation of the valve into the system, the completehydraulic system must be flushed (according to ISO 6072).

2 Please read the notes in section entitled Electronics , page Quality Management System conforms to DIN EN ISO SERVO- AND PROPORTIONAL control VALVESFor over 50 years Moog has manufactured proportional con-trol Valves with integrated electronics. During this time, morethan 200,000 Valves have been delivered. These servo- and proportional control Valves have been provento provide reliable control for injection and blow moldingequipment, die casting machines, presses, heavy industry equip-ment, paper, lumber processing, and other catalog is for users with technical knowledge. To ensurethat all necessary characteristics for function and safety are giv-en, the user has to check the suitability of the products describedherein. The products described herein are subject to changewithout notice. In case of doubt, please contact Moog Inc. Moog is registered trademark of Moog Inc. and its trademarks as indicated herein are the property of MoogInc.

3 And its subsidiaries. Moog Inc. 2003. All rights reserved. Allchanges are reserved. For the most current information, (insert product name).Moog D680 Series3 BENEFITS AND FUNCTIONALITYD681 - D685 OPERATIONAL FEATURES OF THE DIRECT DRIVE PILOT VALVE A direct drive pilot valve requires no pilot leakage flow. This results in considerable energy savings, especially for systems with multiple Valves . The dynamics of the direct drive valve is nearly independent of the operating pressure. Reliable operation. The excellent pressure gain of the pilot valve with spool / bushing, provides high spool driving forces to the long stroke main spool. This ensures enhanced mainspool position control even with high flow forces and contaminated fluids. Excellent dynamics based on a high natural frequency allows high main spool position loop gain, resulting in extremely good static and dynamic response of the main OF THE DIRECT DRIVE PILOT VALVEThe D633 Series pilot valve consists of a permanent magnet linear force motor, a drive rod connecting motor armature andthe spool guided in a bushing.

4 The linear force motor containsa coil, permanent magnets, pole pieces, an armature and a cen-tering spring 4-way spool controls fluid flow from the pressure port toone of the load ports, and also from the other load port to return. Deflection of the centering spring due to spool dis-placement, provides a return force for the electric current applied to the coil of the linear force motorproduces an electromagnetic flux depending on the currentpolarity. This electromagnetic flux is superimposed on the per-manent magnetic flux in the airgaps between armature andpole pieces. This results in a polarity dependent displacementof the armature against the centering spring force. The spool being connected to the armature by a rod shares thearmature motion . Flow forces acting on the spool due to thefluid flow through the valve, and friction forces between spooland bushing due to contaminated fluid, are overcome by theforce motor. The position of the spool is approximately pro-portional to the coil FEATURES OF THE COMPLETE VALVE Valve body for high rated flow, optional with external pilot supply using X and Y ports.

5 Reduced spool drive area with D683 and D684 Series results in the following advantages:- improved dynamic response- reduction in pilot fluid flow for fast movements of the main spool. Failsafe versions available with defined safe spool position using a spring and a 4/2-way solenoid valve for control flowshort circuit. The D680 series proportional control Valves are of two-stage combining a fast first stage, suitable main spool drive area and integrated electronics, an optimum proportional valve can be PRINCIPLE OF THE COMPLETE VALVE The position control loop for the main stage spool, positiontransducer and pilot valve is closed by the integrated electric command signal (flow rate set point) is applied tothe integrated position controller which drives the current inthe pilot valve position transducer (LVDT) which is excited via an oscilla-tor, measures the position of the main spool (actual value, posi-tion voltage). This signal is then demodulated and fed back to the controller where it is compared with the command signal.

6 The controller drives the pilot valve until the error betweencommand signal and feedback signal is zero. Thus, the position of the main spool is proportional to the elec-tric command SPECIFICATIONS FOR D681 TO D685 Operating pressure rangePorts P, A and Bup to 350 bar (5000 psi)Port T see data of individual seriesPilot pressuremin. 10 bar (150 psi) overT or Ymax. 350 bar (5000 psi)Temperature rangeAmbient 20 C to +60 C (-4 F to +140 F)Fluid 20 C to +80 C(-4 F to +170 F)Seal materialNBR, FPM, and others on requestOperating fluidmineral oil based hydraulic fluid (DIN 51524 part 1 to 3) and ISO 11158, other fluids on request Viscosityrecommended 15 to 45 mm2/sallowed5 to 400 mm2/sSystem filtrationPilot valve: high pressure filter (without bypass, but with dirtalarm) mounted in the main flow and if possible, directlyupstream of the stage: high pressure filter as for the pilot stage. In com-bination with a fast regulating variable displacement pump, anoff-line filter is of cleanlinessThe cleanliness of the hydraulic fluid particularly effects the performance (spool positioning, high resolution) and wear (metering edges, pressure gain, leakage) of the cleanliness classFor normal operationISO 4406 < 18 / 15 / 12 For longer lifeISO 4406 < 17 / 14 / 11 Recommended filter ratingFor normal operation 10 75 (10 m absolute)For longer life 6 75 ( 6 m absolute)Installation optionsany position, fixed or movable Vibration30 g, 3 axesDegree of protectionEN60529.

7 IP 65, with mating connector mountedShipping plateDelivered with an oil sealedshipping plate4 Moog D680 SeriesGENERAL TECHNICAL DATAD681 - D685 VALVE FLOW CALCULATIONSThe actual valve flow is dependent on the spool position andthe pressure drop across the spool 100% command signal ( +10 VDC = 100% valve opening),the valve flow at rated pressure drop pN= 5 bar (75 psi) permetering land is the rated flow QN. For other than rated pres-sure drop, the valve flow changes at constant command signalaccording to the square root function for sharp edged actual valve flow Q calculated in this way, should result inan average flow velocity in ports P, A, B or T of less than 30 m/s. 5102030507010030205080100150200300500800 200015001000 Rated pressure drop pN / bar Valve pressure drop p / bar30004500 Flow rate Q / l/minD685-P15D685-P10D684-P05/N05D683-P0 3/N03D682-P02D682-P01D681-P80D681-P60D68 1-P301000 l/min1500 l/minQ / l / min= calculated flowQN/ l / min = rated flow p / bar= actual valve pressure drop pN/ bar= rated valve pressure dropValve flow diagramValve flow for maximum valve opening (100% command sig-nal) as a function of the valve pressure - D685 Moog D680 Series Minimum cross-section of all leads mm2 (AWG 18).

8 Consider voltage losses between cabinet and valve. Note: When making electric connections to the valve (shield, ), appropriate measures must be taken to ensure that local-ly different earth potentials do not result in excessive groundcurrents. Also see Moog Technical Note TN 353. Supply 24 V DC, min. 18 V DC, max. 32 V DC Current consumption D68X 200 mA static800 mA dynamicExternal fuse per valve at D68X A (slow) All signal lines, also those of external transducers, shielded. Shielding connected radially to (0 V), power supply side,and connected to the mating connector housing (EMV). EMV: Meets the requirements of emission: EN55011:1998+A1:1999 (limit class: B)and immunity: EN61000-6-2:1999 GENERAL REQUIREMENTS FOR VALVE ELECTRONICSD681 Series 2-stage Proportional control Valve with Series Pilot ValveABPTXYT2 Hydraulic symbol: Symbol shown with pilot pressure, electric supply enable signalon and zero command Series 2-stage Proportional control Valve with Series Pilot Valve ABPTXYH ydraulic symbol: Symbol shown with pilot pressure, without electric supply onenable signal off.

9 Failsafe spool position A T .XYTAPBTVBVPVAV6 Moog D680 SeriesELECTRONICSD681 - D685lValve side4 to 20 mAVFB500 Spool stroke rangeUF = 2 to 10 VCentred position 6 VRFL=UFPEABCDEFWIRING FOR Valves WITH 6+PE POLE CONNECTOR To EN 175201 Part 804, and mating connector (metal shell) with leading protective earth connection ( ). Also see input command wiring schematic, Page 40 (see additional information in AM 426 E spec.).VALVE ELECTRONICS WITH SUPPLY VOLTAGE 24 VOLT AND 6+PE POLE CONNECTORC ommand signal 0 to 10 mA floating, Valves with current command inputThe spool stroke of the valve is proportional to ID= IE. 100% valve opening P A and B T is achieved at ID= +10 mA. At 0 mA command, the spool is in centered posi-tion. The input pins D and E are inverting. Either pin D or E isused according to the required operating direction. The otherpin is connected to signal ground at cabinet signal 0 to 10 V, Valves with voltage command inputThe spool stroke of the valve is proportional to (UD UE).

10 100% valve opening P A and B T is achieved at (UD UE) = +10 V. At 0 V command, the spool is in centered posi-tion. The input stage is a differential amplifier. If only one com-mand signal is available, pin D or E is connected to signal ground at cabinet side according to the required value 4 to 20 mAThe actual spool position value can be measured at pin F (seediagram on the top). This signal can be used for monitoring andfault detection purposes. The spool stroke range correspondsto 4 to 20 mA. The centered position is at 12 mA. 20 mA corresponds to 100% valve opening P A and B diagram for measurement of actual value IF(position ofmain spool) for Valves with 6 + PE pole connector (signal Mand X ) FunctionF Output actual valve Spool position Protective earthVoltage command (0 V)UC B > + V DCUC B < + V DC24 V DC (min. 18 V DC, max. 32 V DC)Ie = 2,0 mA at 24 V DC, max. 32 V DC (see note above)A SupplyCurrent commandStatic: Imax.