D661 Series Installation and Operation Instruction …

1 CAUTIONDISASSEMBLY, MAINTENANCE, OR REPAIR OTHER THAN IN ACCORDANCE WITH THEINSTRUCTIONS HEREIN OR OTHER SPECIFIC WRITTEN DIRECTIONS FROM MOOG WILLINVALIDATE MOOG S OBLIGATIONS UNDER ITS SeriesISO 4401 Size 05 Installation and Operation InstructionServo and Proportional Control Valves with Integrated Electronics1. INTRODUCTIONThis manual provides instructions and procedures necessaryto install, operate and troubleshoot the Moog D661 Series Servo and Propor-tional Control OPERATIONG eneralThe Servovalves D661-G, S and H Series and the Proportional FlowControl Valves D661-P Series are throttle valves for 2-, 3- and 4-wayapplications. With proportional flow control valves, 5-way applications are alsopossible. These valves are suitable for electrohydraulic position, velocitiy,pressure or force control systems with high dynamic response , S and HThe spool of the main stage is driven by a nozzle flapper or ServoJet pilot stage, optional with or without additional mechanical feedback (nozzleflapper only).

2 With versions D661-S and H in case of an electrical supply failurethe spool is moved into a preferred position by action of an additionalmechanical VALVE CUT-AWAYF igure 1 Moog Series D661-G Series , without additional mechanical feedbackXT A P B T2 YConnectorSpoolBushingScrew Plug for Null AdjustSeries ModelsSeries GServovalve with nozzle-flapper or ServoJet pilotstage, spool in bushing, without additional mechanicalfeedbackSeries SServovalve configured like version G, but with additionalmechanical feedbackSeries HServovalve configured like version S, but with improvedperformance (high response) Series valve with ServoJet pilot stage, spool in body,without additional mechanical feedbackSeries valve configured like version , butwith nozzle flapper pilot stage and additional mechanicalfeedbackJet pipeAnnularareaNozzleReceiver2 Operating Principle of the Two-Stage ValveAn electric input signal (flow rate command) is applied to the integratedcontrol amplifier which drives a current through the coils of the pilot stagetorque motor.

3 Thus the deflected nozzle-flapper system produces a pressuredifference across the drive areas of the spool and effects its movement. Theposition transducer which is excited via an oscillator measures the positionof the spool (actual value, position voltage).This signal is then rectified by a demodulator and is fed back to the controlamplifier where it is compared with the command signal. The control amplifierdrives the torque motor until command voltage and feedback voltage are , the position of the spool is proportional to the electric command Flow Control Valve nozzle flapper design of the pilot stage has been converted into animproved version with jet pipe amplifier (ServoJet ).The ServoJet pilot stage consists mainly of torque motor, jet pipe current through the coil displaces the jet pipe from neutral.

4 Thisdisplacement combined with the special shape of the nozzle directs a focussedfluid jet more into one receiver bore than into the jet now produces a pressure difference in the control ports. Thispressure difference results in a pilot flow, which in turn causes a spooldisplacement. The pilot stage drain is through the annular area around thenozzle to Principle of the Two-Stage ValveAn electric input signal (flow rate command) is applied to the integratedcontrol amplifier which drives a current through the coil of the pilot stagetorque motor. The thus deflected jet pipe produces a pressure differenceacross the drive areas of the spool and effects its position transducer which is excited via an oscillator measures theposition of the spool (actual value, position voltage).

5 This signal is thendemodulated and fed back to the controller where it is compared with thecommand signal. The controller drives the torque motor until the errorbetween command signal and feedback signal is zero. Thus the position of thespool is proportional to the electric command Version applications with proportional control valves where certain safetyregulations are applicable, a defined metering spool position is needed in orderto avoid potential damage. Therefore, failsafe versions are offered as anoption for the MOOG proportional external triggering, this failsafe function causes a defined meteringspool Failsafe version (biased pilot stage with mechanical feedback)The safe position of the spool will be obtained after cut off of pilotpressure supply (external pilot connection) or operating pressure supply(internal pilot connection).

6 This safe position can only be obtained with <1 bar pilot Serieswith electrically operatedfailsafe functionProportional Serieswith electrically operatedfailsafe function2- stage Proportional SeriesServovalve D661 - ..S and HSeries with additionalmechanical feedbackATTENTION3 Electric characteristics of the 2/2-way solenoid valveConnector wiringFunctionelectro magneticNominal voltage24 VDCN ominal power12 WDIN 43650-1 Form A: 2+PE-PG9 With failsafe versions R and L, a defined spool position is reachedwhen the electric supply to the valve electronics is switched offwhile the pilot pressure is still applied. With version M, the resulting spoolposition is operated failsafe versionThe safe position of the spool will be obtained after switching off theintegrated 2/2-way solenoid seat failsafe versions W, U and G, after cut-off of the solenoid, thespool moves to midposition.

7 When the electric supply to the valveelectronics is switched off while the pilot pressure is still effective and the solenoidis still switched on, the spool will move to a defined end position with versions Uand failsafe version P, the integrated seat valve will shut off theexternal pilot pressure after switching off the off the 24 VDC supply to the solenoid operated 2/2-wayseat valveTo protect relay contacts or semiconductors against damage, a Zenerdiode is requiredConsider inductive load of the solenoid coil!1) With version P at 210 bar pilot or operating pressure,with versions G,S and H at 140 bar pilot or operating pressure,fluid viscosity of 32 mm /s and fluid temperature of 40 ) For long life wear protection of metering landsFor additional technical information such asdimensions, ordering information, etc.

8 , see theD660 Series (for code letter of valve version see pages 18/19) patternISO 4401, version with second tank portISO 4401 - 05 - 05 - 0 - 94 ISO 4401 - 05 - 05 - 0 - 94 With Series 5-way version, the portdesignated T2 is used as second pressure port P2 Mass[kg] flow QN[l/min]see nameplate of the valvesee nameplate of the valveat DpN = 5 bar per land, tolerance 10 %Null leakage flow1)total, max.[l/min] to ( to ) leakage flow1)pilot stage only[l/min] flow1)max, for 100% step input[l/min] operating pressure pmaxMain stageports P, A, B[bar]350350port T, (T2) with Y internal[bar]20% of pilot pressure, T, (T2) with Y external[bar]350350 Pilot stageregular version[bar]210280with dropping orifice (on request)

9 [bar]350350 Temperature rangeAmbient[ C]- 20 to + 60- 20 to + 60 Fluid[ C]- 20 to + 80- 20 to + 80 Operating fluidmineral oil based hydraulicmineral oil based hydraulicfluid according to DIN 51524,fluid according to DIN 51524,part 1 to 3, others upon requestpart 1 to 3, others upon requestViscosityrecommended[mm2/s]5 to 4515 to 45allowable[mm2/s]5 to 4005 to 400 System filterHigh pressure filter, mountedHigh pressure filter, mountedin the main flow withoutin the main flow withoutbypass, but with dirt alarmbypass, but with dirt alarmClass of cleanliness according toISO 440616 / 13 or better 2)16 / 13 or better 2)NAS 16387 or better 2)7 or better 2)Filter ratingfor normal Operation 15 75 (15 m absolute) 15 75 (15 m absolute)for longer life 10 75 (10 m absolute) 10 75 (10 m absolute)

10 Technical DataATTENTIONATTENTIONATTENTIONATTENTION ATTENTIONATTENTIONI nternal/External Pilot for Operation with internal or external pilot pilot connection mode as shipped is indicated by the respectivecode letter of the type designation on the the 5-way version, where the T and T2 ports are interchangedwith the P port, pilot supply port X and return port Y must beconnected SAFETY INSTRUCTIONSW arnings and to special orders and prohibitions to prevent to special orders and prohibitions to prevent injury orextensive damageCorrect D661 Series Valves are control valves suited for electrohydraulicposition, velocity, pressure and force valves are designed for flow control in hydraulic systems thatoperate with mineral oil based fluids.