Electro-Hydraulic 4-Way Directional Servo Valve Model 4 WS 2 E.10 and 4 WSE 2 E. 10 (Series 4X) PSI (315 bar) K K

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1 Electro-Hydraulic -Way Directional Servo Valve Model WS 2 E. and WSE 2 E. (Series X) Size (D 5)... 6 PSI (5 bar)... 2 GPM (75 L/min) R /6.98 R /6.98 Replaces: 5.9 Features: Servo valve for the closed loop control of position, force and velocity Two stage modular design for easy maintenance st stage is a flapper/nozzle design Mounts on standard ISO -5, NFP T.5. M R and NSI 9.7 D 5 interface, with additional X port for external piloting For subplates, see R 5 5 Can be used in conjunction with several feedback devices Dry torque motor which is isolated and cannot be contaminated by the fluid May also be used as a -way valve 5 different coils available to meet your requirements Valve electronics are available separately (standard plug-in Euro card design) or integrated into the valve Valve with integrated electronics are adjusted and tested as a unit K 22-5 K 26- Model WS 2 EM -X/... with mechanical feedback, associated electronic amplifier card (ordered separately) Model WSE 2 EE -X/... with electronic feedback and integrated electronics Table of contents Description Page Functional description 2 Sectional diagram Ordering code Explanation of ordering code 5 Valve symbols 5 Technical data general 6 Technical data hydraulic 6 Technical data electrical 7 Technical data inductive positional transducer 7 Electrical connections for external electronics 8 Electrical connections for integrated electronics 9 Description Page Operating curves flow vs. load Operating curves flow vs. signal Operating curves frequency response, barometric feedback Operating curves frequency response, mechanical feedback Operating curves frequency response, electrical feedback 2 Unit dimensions mechanical feedback Unit dimensions electrical feedback Unit dimensions barometric feedback Unit dimensions, sandwich plate for external pilot oil drain 5 Flushing plate, flushing instructions 5 External control electronics 6 Note: For service manual, request RDE S For complete parts list, request RDE E! /6

2 R /6.98 Functional description Valves Model WS 2 E... and WSE 2E... are electronically operated 2-stage servo valves. These valves are primarily used for closed loop control of position, force and velocity. These valves consist of two stages, the st stage (2), has a magnetic torque motor () and is of flapper/nozzle type design. The 2 nd stage (9) of the valve has a precision ground -way control spool and a feedback system which may be either mechanical, electrical or barometric as described below. Pilot control ( st stage) The st stage is a pilot valve which is electronically operated by a servo amplifier. The flapper/nozzle configuration functions like a Hydraulic mplifier. The armature of the torque motor () is tilted from the neutral position by an electrical current, thereby offsetting the flapper () between the two orifices (). This change in flapper position creates a change in the flow area, in relation to the two fixed orifices, which therefore causes a differential pressure. This controls the spool (9) in the second stage of the valve. The valve can be ordered in conjunction with a separate electronic amplifier card (Model WS), or it can also be ordered with the electronics integrated into the valve (Model WSE) depending on what is best for the application. Model WS, requires separate electronic amplifier To control this valve an external electronic control (servo amplifier) is used, which amplifies the input signal to a level required for the output signal to the valve. Depending on the specific application, several types of amplifiers are available. Model WSE, integrated electronics To control this valve, a specially tuned electronic control (6) is integrated in the valve, under the cover. This closed loop control, output stage and the oscillator/demodulator are molded into the cover. The command value can either be a regulated voltage (± V), or a regulated current (± m), causing the valve spool to move. Mechanical feedback on the 2nd stage (Fig.. and.2) The control spool in the second stage (9) is physically connected to the torque motor () with the mechanical feedback linkage (5). The torque tube () centers the armature (5) and the flapper () into the neutral centered position, when de-energized. When a current is supplied to the torque motor () a magnetic field is generated which changes the position tilts the T bar (5), and therefore also the flapper () and feedback spring (5). This movement of the flapper, closer to one and farther from the other fixed orifices (), causes a differential pressure which acts on the spool. Due to the effects of the pressure differential, the control spool (9), is shifted and continues to move until the pressure is again equalized on both sides. Therefore, the stroke of the control spool (9) within the sleeve () is directly proportional to input current from the electronic servo amplifier. Electrical feedback on the 2 nd stage (Fig. 2. and 2.2) The control spool in the second stage (9) is physically connected to a rod (7) which is able to move in the inductive positional transducer (6). Spool movement is continually monitored and any change is sensed instantaneously. Dependant on spool position, different value voltage signals are fedback to the associated electronic amplifier, for comparison of actual vs. desired position and error correction if required. When current is supplied to the torque motor () a magnetic field is generated which changes the position tilts the T bar (5) and therefore also the flapper (). This movement of the flapper, closer to one and farther from the other fixed orifices (), causes a differential pressure between the control chambers (8) & () which acts on the spool. Due to the effects of the pressure differential, the control spool (9) and feedback rod (7) are shifted and continue to move until the actual feedback value agrees with the desired input signal value. Then the pressure is again equalized on both sides and the control signal is at zero. Therefore, the stroke of the control spool (9) within the sleeve () is directly proportional to input current from the electronic servo amplifier. arometric feedback of the 2 nd stage (Fig. and.2) In the de-energized position the control spool in the second stage (9) is pressure balanced, and is held in the neutral or centered position by the contol springs (2). When current is supplied to the torque motor () a magnetic field is generated which changes the position tilts the T bar (5) and therefore also the flapper (). This movement of the flapper, closer to one and farther from the other fixed orifices (), causes a differential pressure between the control chambers (8) & () which acts on the spool. Due to the effects of the pressure differential, the control spool (9) is shifted and continues to move until control springs (2), flow forces and pressure is again in balance. Since the control springs have a linear characteristic, the stroke of the control spool (9) within the sleeve () is directly proportional to input current from the electronic servo amplifier. 2/6

3 Valve with separate electronic amplifier Valve with integrated electronics 6 R /6.98 P T Fig. Mechanical feedback (standard with external electronics) Fig.2 Mechanical feedback P T 9 8 Fig 2. Electrical feedback P T Fig 2.2 Electrical feedback (standard with integrated electronics) 6 P T Fig. arometrical feedback 9 8 Fig.2 arometrical feedback /6

4 R /6.98 Ordering code X Electrically operated 2-stage, -way servovalve: with separate electronics = WS 2 E with integrated electronics = WSE 2 E Mechanical feedback (standard for valves with separate electronic amplifier = M Electrical feedback (standard for valves with integrated electronics) = E arometric feedback (spring centered) = Size (NFP/NSI D 5) = Series to 9 = X ( to 9 externally interchangeable) Flow at a pressure drop across the valve of p V = PSI (7 bar).5 GPM (2 L/min) = 2. GPM (5 L/min) = GPM ( L/min) = 5. GPM (2 L/min) = 2 8 GPM ( L/min) = 2 GPM (5 L/min) = 5 6 GPM (6 L/min) = 6 2 GPM (75 L/min) = 75 (tolerance band for the flow vs. signal function is shown on page ) 2 Valves with separate electronics: Coil no. 5 m / 5 Ohm per coil = Coil no. 2 m / Ohm per coil (Standard) = 2 Coil no. 7.5 m / 2 Ohm per coil = Coil no. 2 m / 8 Ohm per coil = Coil no. 5 5 m / 28 Ohm per coil = 5 Valves with integrated electronics: input signal: command value ± m / kω NNNNNNNN = 8 command value ± V / 5 kω (standard) N = 9 Pilot supply and Valve Model: WS 2 EM WS 2 EE drain WSE 2 EM WS 2 E WSE 2 EE WSE 2 E Externally piloted, externally drained = Internally piloted, externally drained = E Externally piloted, internally drained = T Internally piloted, internally drained (standard) = ET available; = not available Remarks: Sandwich plate (X X), must be ordered separately, see page 6 item 9 Test unit for WSE (integrated electronics) Model number VT-VET-, Series X, data sheet R The test unit is used for the control and function monitoring of integrated electronic valves. * 5 Further details in clear text M = NR seals suitable for petroleum oils (HM, HL, HLP) V = FPM seals suitable for phosphate ester fluids (HFD-R) Spool overlap =.5 to.5 % positive =.5 to.5 % negative C =. to 5. % positive D = to.5 % positive E = to.5 % negative Electrical connections Valves with separate electronics: K8 = socket to size S 2 S without mating plug without electric socket mating connectors RR 2 6 (order separately) Valves with integrated electronics: electrical feedback: K9 = socket to size E S 6 S without mating plug mating connectors RR 59 (order separately) mechanical or barometric feedback: K = socket to size E S 5 S without mating plug mating connectors RR 92 (order separately) Input pressure range to the first stage 5 = feedback mechanical 5 6 PSI ( 5 bar) = { 5 58 PSI ( bar) 7 = electric or 58 PSI ( 7 bar) = barometrical 2 PSI (7 bar) 2 = feedback 2 5 PSI ( 2 bar) 5 = 5 6 PSI (2 5 bar) Test unit for WS2 (battery driven) Part number for ordering RR 57, see data sheet R Note: Test unit only for valves with separate electronics. only for coil numbers, 2 and. with electrical feedback only the maximum flow will be signaled. /6

5 Explanation of ordering code Nominal flow The nominal flow is the flow in GPM (L/min) at nominal current signal and at PSI (7 bar) pressure drop [5 PSI (5 bar) per control land]. Other values will necessarily produce a different flow rate. The flow tolerance band and also the influences of saturation of flows equal to or above 6. GPM (6 L/min) must be noted (see page ). If required, servo valves can be supplied with special operating curves (with a subdued form, progressive, or with special spool overlaps). ny special characteristics or parameters must be very clearly specified. 2 Coil electrical control data The control signal must be generated from a current regulated output stage. The standard coil for valves with separate electronics is spool number 2 ( m/ Ω). With coil numbers,, and 5, the closed loop electronic control (servo amplifier) must be custom matched with the valve. With integrated electronic controls, the signal value can be supplied as a voltage signal code 9, or for long distances [more than 82 ft (25 m) between the computer and the valve] as a current signal code 8. Input pressure range to the st stage The pilot pressure should be as constant as possible. Therefore, it is often best to externally pilot the valve via port X. Mechanical feedback Pilot pressure: 5 to 6 PSI ( to 5 bar) The pilot pressure should not be less than 6% of the system pressure order to avoid reduction in the controllability, due to flow forces on the valves control spool. Electric feedback The pilot pressure should be kept within the pressure range where possible. In order to influence the dynamic response of the valve, it may be fed with a higher or lower pilot pressure. When the input pressure of 58 PSI ( bar), it is always better to keep pilot pressure at port X equal to the system pressure at port P. R /6.98 arometric feedback system The pilot pressure can not be higher than the maximum pressure in the model code designation. The nominal flow refers to the mean pressure of the relevant pressure stage and changes with the pressure level. Spool overlap The spool overlap given in % refers to the control spool stroke of.5 inches (.8 mm). For closed loop control, we recommend an overlap close to zero or slightly negative, like the E spool overlap. Spool overlap This is the limit of the range for applications inclosed and open loop controls. The position flow is much less than for D. Spool overlap Mostly applied at pressures less than 22 PSI ( bar). Suitable for position, force and pressure control in closed loop, it requires a higher degree of damping than with spool D, and a greater position flow is only of secondary importance. Spool overlap C Suitable for open loop or velocity control. Spool overlap D Suitable as a universal overlap for closed loop control of position, force and velocity with low position flow, however with lower damping than that of spool. Spool overlap E Suitable for highly accurate applications with a somewhat higher position flow than with spool D. Main applications: control of pressure and force in a closed loop. 5 Further details to be written in clear text Special requirements should be specified here in clear text. fter the receipt of an order, this will be checked by the factory and the valve code extended by an additional code when required. Symbols (simplified) Servo valve for separate electronics Servo valve with integrated electronics a, b a, b P T P T Mechanical feedback M Electrical feedback E arometric feedback a P T b a, b a P T b a, b a P T b a, b 5/6

6 R /6.98 Technical data (For applications outside these parameters please consult us!) General Weight (approx.) lbs (kg) WS 2 EM -X/ (.) WS 2 EE -X/..with separate electronics.9 (.9) WS 2 E -X/...5 (.6) WSE 2 EM -X/ (.2) WSE 2 EE -X/..with integrated electronics. (2.) WSE 2 E -X/...75 (.7) dditional items: Sandwich plate for external piloting (model " ", "T"), see page 5, item 6.66 (.) Sandwich plate for external drain (model " ", "E"), see page 5.55 (.25) Flushing plate, see page (.) Cable connections 6-/2 ft (2 m) long (for valves with separate electronics only) each cable. (.2) Mounting position Optional, however, the pilot pressure must be 5 PSI ( bar) before start-up mbient temperature range F ( C) 22 to +58 ( to +7) with external electronics 22 to + ( to +6) for WSE 2 E. (with integrated electronics) Hydraulic, measured at ν = 9 SUS (2 mm 2 /s) and t = F ( C) Feedback system Mechanical Electrical (V p = 5) ) arometric Operating pressure range PSI (bar) 5 to 6 ( to 5) 5 to 6 ( to 5) 5 to 6 ( to 5) ports,, P, X (note pressure range) (note pressure range) Return line pressure PSI (bar) Pressure peaks <5 () Pressure peaks <5 () Pressure peaks <5 () ports T, Y static <5 () static <5 () static <5 () (Return line pressure reduces spool stroke) Hydraulic fluid Petroleum oil (HM, HL, HLP) Phosphate ester fluids (HFD-R) Fluid cleanliness Maximum allowable fluid cleanliness level Class 6/, according to ISO 6. Therefore, we recommend a filter with a minimum retention rate of ß 5 without bypass valve, with clogging indicator directly before the valve or as close as possible. Fluid temperature range F ( C) 5 to +76 ( to +8) Viscosity range SUS (mm 2 /s) 92 to 76 (2 to 8); preferably to 28 ( to 5) Nominal flow (Q N ) GPM (L/min) ±% at p V = PSI (7 bar) 2) (2) (5) () (2) () (5) (6) (75) Flow in center pos. 5) GPM (L/min).2 GPM p v.2 GPM (.8 L/min) control fluid for pilot stage (.8 L/min) 5 PSI (7 bar) Pilot leakage & leakage p v.2 GPM (.8 L/min).2 GPM p +. Q of whole valve ), ) 5 PSI (7 bar) +. Q N N ) (.8 L/min) 5 PSI (7 bar) The centered position flow data is valid only without an overriding dither signal; it will increase if dither is applied. Hysteresis % (pressure stage and 7) (with dither optimized) (pressure stages, 2, 5) Reversal voltage %... Sensitivity % Pressure gain Spool overlap: 5% of p for % spool stroke (from the hydraulic null point) ) V p = electrical gain Spool overlap:, E Spool overlap: D 2) p V = pressure drop across valve in PSI (bar) ) Q N = Nominal flow in GPM (L/min) % of p for % spool stroke (from the hydraulic null point) 75% of p for % spool stroke (from the hydraulic null point) ) p = Operating pressure in PSI (bar) 5) The zero flow data is valid without overlapping dither signal and increase with the dither part. 6/6

7 Technical Data (For applications outside these parameters please consult us!) R /6.98 Electrical Feedback type mechanical electrical (Vp = 5) barometric Null compensation current % < 5, long term < 8 <, longterm < 5 Null offset, starting with a nullpoint corrected valve with alteration of: Fluid temperature % < 2 / 68 F (2 C) < / 68 F (2 C) mbient temperature % < 2 / 68 F (2 C) < / 68 F (2 C) System pressure (.8 to.2) x p in bar % < 2 < < Return line pressure ( to.) x p in bar % < 2 < < Insulation Exceeds NEM class special installation on request Type of signal analog Coil number ssociated amplifier ** * ** ** ** integrated electronics (The amplifier card must *With mechanical and barometric feedback use amplifier be ordered separately) Model SR 2, see R 29 98, or amplifier Model VT 6, see R For electrical feedback use amplifier Model SR, see R , or amplifier Model VT 6, see R **Please consult us for electronics. Nominal current per coil m Resistance per coil Ω Inductivity at 6 Hz and% nominal current Series circuit H Parallel circuit H Recommended The amplitude of the dither depends on the hydraulic dither signal: f = Hz installation; maximum limit % of nominal current Command value current regulated m ± voltage regulated V ± Input resistance kω 5 Supply voltage (± %) V ±5 ct. position value for spool setting V approx. ± at % command value (only Model WSE2EE...) Electrical (inductive positional transducer) for external electronics Electrical measuring system Differential transformer Nominal spool stroke inches (mm) ±. (.8) Sensitivity with.5 khz mv/v.7 () carrier frequency in (mm) Resolution (static) continuous Feed voltage (V eff ) V.5 Carrier frequency khz.5 7/6

8 R /6.98 Plug-in connectors For model WS2 (external electronics) Plug-in connector must be ordered separately under part no. RR 2 6; For PIN allocation see below and block circuit diagram on page 2.6 (6).79 /F (2) Ø. (28) For model WSE2EM and WSE2E (integrated electronics) and model WS2EE (external electronics, inductive feedback) Plug-in connector must be ordered separately part no. RR 92; For PIN allocation see below.9 () For model WSE2EE (integrated electronics) part no. RR 59; For PIN allocation see below Electrical connections: Model WS 2 E... (valves for external electronics) Pilot control (st stage) Plug pin connections Positional transducer Plug pin connections blue green green/yellow blue C D red yellow C E D red black brown Electrical connections to the servo valve can be made either in parallel, or in series. For safety, due to the lower inductivity obtained, we recommend parallel connection. Parallel connection: For plug connection, connect to and C to D. For cable connection, connect yellow to brown, and green to white. Series connection: For plug connection, connect to C. For cable connection, connect brown to green. n electrical input of (+) to D ( ) for plug connection, or yellow lead (+) to white lead ( ) for cable connection, provides a flow direction in the 2nd stage of P to and to T. Reversing the direction of the current reverses flow direction in the 2nd stage, to P to and to T. Warning: Connection at the plug, or the white wire in the cable must not be connected (due to radio interference effects). 8/6

9 Electrical connections and technical data: Model WSE 2E.... (Valves with integrated electronics) Models WSE 2 EM.. and WSE 2 E.. (mechanical and barometric feedback) R /6.98 Terminal connection Coil "8" Coil "9" R e Integrated electronics C D E Supply + 5 V + 5 V voltage in V 5 V 5 V (± %) C V V Command value D ± m ± V E R e = kω R e 5 kω Current maximum maximum required at m m plug D connection ± m.2 m E Command value: Command value at plug connection D, negative polarity with respect to plug connection E gives a flow from P to and to T. Command value at plug connection D, positive polarity with respect to plug connection E gives a flow from P to and to T. Model WSE 2 EE.. (electrical feedback) R e C D E F Terminal connection Coil "8" Coil "9" Supply + 5 V + 5 V voltage in V 5 V 5 V (± %) C V V Command value D ± m ± V E R e = kω R e 5 kω Measured output F Nominal stroke corresponds to ± V for control spool against V; R i.7 kω Integrated electronics Current maximum maximum required at 2 m 2 m plug D connection ± m.2 m E Command value: Command value at plug connection D, negative polarity with respect to plug connection E gives a flow from P to and to T. Measured output F has a negative polarity with respect to earth ground V. Command value at plug connection D, positive polarity with respect to plug connection E gives a flow from P to and to T. Measured output F has a positive signal with regard to earth ground V. 9/6

10 R /6.98 Operating curves: measured at ν = 9 SUS ( mm 2 /s) and t = 22 F (5 o C) Flow vs. load function for all feedback systems (Tolerance band ±%) Note: Flows are calculated values Nominal flow Q N in L/min p.8 Q = Q N. v 5 PSI (7 bar) Valve pressure drop p v in bar p V = Valve pressure drop (input pressure minus return line pressure minus load induced pressure) Tolerance zone for the flow-signal function Zero through break according to spool overlap 8 6 Flow in % Typical flow curve P ; T Tolerance field Command value in % 6 8 P ; T 5 With flows of 6 GPM (6 L/min), the effects of flow saturation must be observed. 5 Frequency response curves: measured at ν = 9 SUS ( mm 2 /s) and t = 22 F (5 o C) Model WS 2 E.. and WSE 2 E.. arometric feedback mplitude ratio in d Nominal flow Q N 8. GPM ( L/min) Frequency in Hz Phase lag in degrees mplitude ratio in d Nominal flow Q N 2 GPM (5 L/min) Frequency in Hz Phase lag in degrees Pressure stage: = 58 PSI = PSI = 2 PSI = 5 PSI = 6 PSI ( bar) (7 bar) ( bar) (2 bar) (5 bar) /6

11 Operating curves, measured at ν = 9 SUS ( mm 2 /s) and t = 22 F (5 o C) Model WS 2 EM.. and WSE 2 EM.. Mechanical feedback Nominal flow Q N 8 GPM ( L/min) Crossover functions Stroke in % Nominal flow Q N 2 GPM (5 L/min) Crossover functions Stroke in % R / Time in ms Time in ms Pressure stage: = 58 PSI = PSI = 2 PSI = 5 PSI = 6 PSI ( bar) (7 bar) ( bar) (2 bar) (5 bar) Frequency response curves, operating pressure 2 PSI ( bar) Frequency response curves, operating pressure 2 PSI ( bar) mplitude ratio in d Phase lag in degrees mplitude ratio in d Phase lag in degrees Frequency in Hz Frequency in Hz Signal: = ± 5% = ± 25% = ± % ssociated dependency of frequency on operating pressure ssociated dependency of frequency on operating pressure Frequency in Hz Frequency in Hz (5) () (5) (2) (25) (2) Operating pressure in PSI (bar) (5) () (5) (2) (25) (2) Operating pressure in PSI (bar) Signal: = ± 5% = ± 25% = ± % /6

12 R /6.98 Operating curves: measured at ν = 9 SUS ( mm 2 /s) and t = 22 F (5 o C) Model WS 2 EE.. and WSE 2 EE.. Electrical feedback system Nominal flow Q N 8 GPM ( L/min), electrical gain (amplification) Vp = 5 Crossover functions Stoke in % Time in ms Frequency response curves, operating pressure 2 PSI ( bar), Vp = 5 Nominal flow Q N 2 GPM (5 L/min, electrical gain (amplification) Vp = 5 Crossover functions Stoke in % Time in ms Operating pressure = 58, 5, 2 PSI (, 7, bar) = 6 PSI (2 bar) = 57 PSI (5 bar) Frequency response curves, operating pressure 2 PSI ( bar), Vp = 5 mplitude ratio in d Phase lad in degrees Frequency in Hz Frequency in Hz Signal: = ± 5% = ± 25% = ± % ssociated dependency of frequency on operating pressure 2 mplitude ratio in d ssociated dependency of frequency on operating pressure Phase lad in degrees 9 Frequency in Hz Frequency in Hz () () (7) () (2) (5) () () (7) () (2) (5) Operating pressure in PSI (bar) Operating pressure in PSI (bar) Signal: = ± 5% = ± 25% = ± % 2/6

13 Unit dimensions: dimensions in inches (millimeters) R /6.98 Mechanical feedback / with separate electronics Model WS 2 EM -X/ (standard) Zero point adjustment remove plug (2.5 mm /F) to access the potentiometer to set the zero point 2. Plug type MS 6 E S-2 S to non-integrated valve Ordering code: RR Plug type MS 6 E S-5 S to integrated valve Ordering code: RR 92 Space required to remove plug djustment on both sides for setting the Null point (centered position) of the valve (allen wrench mm /F) 5 Interchangeable filter element ( mm /F ) part no. RR 6 82 (for NR seals) part no. RR 6 8 (for FPM seals) 6 Valve mounting bolts, not included ) socket head cap screws /-2 UNC x 2" (M6 x 5) tightening torque = 7.67 lb-ft (. Nm) 7 Nameplate 8 Top cover can be rotated 8 9 Pilot stage (st stage) Second stage O-ring (2 x 2 mm); Ports,, P, T 2 O-ring (7 x.5 mm); Port X Optional port X for external pilot oil supply ore Ø.8 to.97 inches ( mm to 5 mm) If port X is to be used, the sandwich plate must be used. (This plate must be ordered separately) Warning! Port X is connected to pressure. If port X instead of X is to be used a sandwich plate (order separately, see page 5) Cover with integrated electronics.8 (6).6 (5).89 (8).28 (2.5).96 (2).8 (2.) (6.).276 (7). () 2.26 (5) 2 (5.8).69 (7.).6 (27).657 (6.7).72 (2).26 (.2).8 (2) (76).5 ().6 () T 2 X 6.2 (6) (68) X Mechanical feedback / integrated electronics Model WSE 2 EM -X/.6 (5) 6.69 (7) 2.95 (75) P T Ø.9 (9.8);. (.) Ø.26 (6.6) (26) 2.2 (57).575 () Ø.62 (5.7);.59 (.5) ; (.5) 2.62 (6). (2.5).82 (97)./. in./ mm 2 (R max ) Required surface finish of interface when mounting the valve without our subplate /F = cross flats Valve Mounting interface to ISO -5, NFP T.5. M R and NSI 9.7 D 5 except for port X. Subplates (8). () 2.8 (72). (2) G 66/2 (SE-6; 9/6-8) G 67/2 (SE-8; /-6) G 5/2 (SE-2; -/6-2) G 55/2 (SE-2; -/6-2) G 56/2 (SE-6; -5/6-2) with port X Subplates and valve mounting bolts must be ordered separately, see R 5 5 /6

14 R /6.98 Unit dimensions: dimensions in inches (millimeters) Electrical feedback / external electronic control Model WS 2 EE -X/ max. 2.6 (65).2 (26).26 (2) Electrical feedback / integral electronics Model WSE 2 EE -X/.26 (2).2 (26) (5) (52) 2.9 (5).95 (2).95 (2) 2.76 (7) 2. Plug compatible with Type MS 6 E S 2 S to non-integrated valve RR Plug compatible with Type MS 6 E S 5 S to non-integrated valve feedback RR Plug compatible with Type MS 6 E S 6 S to integrated electronics RR 59 Space required to remove plug (take care with the connecting cable) Setting for hydraulic zero point (allen key /F ) 5 Lock nut /F arometric feedback / external electronic control Model WS 2 E -X/ arometric feedback / integral electronics Model WSE 2 E -X/ 5.2 (26) 5.2 (26) (2).95 (2) 2.2 max..69 ().26 (2) max..69 ().26 (2) 2. Plug compatible with Type MS 6 E S 2 S to non-integrated valve RR Plug compatible with Type MS 6 E S 5 S to integrated electronics RR 92 Setting for hydraulic zero point (allen key /F ) 5 Lock nut /F /6

15 R /6.98 Unit dimensions, Sandwich plates for external pilot oil feed: dimensions in inches (millimeters) External pilot oil supply (models and T ) The servo valve always has port X. If there is no X port on the mounting surface, the sandwich plate (6) must be used with external pilot oil feed is required. Either port X or X2 may be used. 6 Sandwich plate with NR-seals, ordering code RR 9 82 FPM-seals, ordering code RR Valve mounting bolts ) socket head cap screws /-2 UNC x " (M6 x 75) tightening torque = 7.67 lb-ft (. Nm) 8 Mounting surface for the sandwich plate (6) 9 /" SP plug, ordering code RR 97 O-ring mm x 2 mm 2 O-ring (2 x 2 mm); ports,, P, T 2 O-ring (.82 x.78 mm); port X 2.6 (6).6 (5.5).98 (25).7 (.).276 (7).787 (2) 9 G /" (SP);.7 (2) deep.92 (2.5) X2 X2 X T P. (7.9).5 (85) X T /. in./ mm (R max ) Required surface finish of interface when mounting the valve without our subplate.2 (5) X External pilot oil drain (models and E ) Sandwich plate (22) is not be used with mechanical feedback or electrical feedback with integrated electronics. 22 Sandwich plate included 2 For pilot oil feed Model " ", port X may be used instead of port X for the oil feed. 22 Y only in valve type: WS 2 EE... WS 2 E... WS E 2 E... G /" (SP;.7 (2) deep 2 G /" (SP;.7 (2) deep X 2.2 (56) Y.6 (27) Unit dimensions, Flushing plate: dimensions in inches (millimeters) Symbol T P X T with NR-seals Ordering code RR O-ring (2 x 2 mm); ports,, P, T 2 O-ring (7 x.5 mm); port X 2 ) socket head cap screws /-2 UNC x 2" (M6 x 5) tightening torque =. lb-ft (5.5 Nm) In order to guarantee the perfect functioning of servo valves, the installation must be flushed prior to start-up. s a guide to the flushing time required, the following formula can be used: t = Flushing time in minutes V t 5 V = Tank contents in gallons (liters) Q q V = Pump flow in GPM (L/min) When refilling more than % of the tank contents, the flushing process should be repeated. Note: directional control valve with mounting pattern according to ISO -5, NFP/NSI D 5 is better than a flushing plate. Such a valve allows the actuator ports and lines to also be flushed. Refer to R (7).8 (6).7 (2) (9.7).969 (2.6).5 (.5) Ø.276 (7).8 (6).9 ().58 ().5 (9).7 (8) 2.26 (5) 2 (5.8).69 (7..6 (27).657 (6.7).26 (.2) T X P.7 (2) 9 T.79 (2) 5/6

16 R /6.98 Control electronics for valve type WS2EM and WS2E : servo amplifier SR 2 (must be ordered separately) external servo amplifier is used to control the valve. This changes the analogue input signal (command value) in such a way that a regulated current control of the servo valve can be effected using the output signal. Technical data Supply voltage V : ± 22 to 28 V smoothed Max. output current I max : ± 6 m Card dimensions: Eurocard x 6 mm, DIN 9 Front plate dimensions Height: U (28. mm) Width conductor side: HP (5.8 mm) Width component side: 7 HP For applications outside these parameters, please consult us! Detailed information: Data sheet R Terminal connections / block diagram Input Input 2 Input Signal voltage for relays K, K2, K Controller changeover +UL (L) Nominal value ctual value Controller output Supply voltage ± 22 to ±28 V = +2 V V 2 V 28a a 2a 6a a 2a 6c c 28c 2c c 6c 2c J Cu J9 2 Cu J6 L +VL 5 +VL L VL V7 V6 PD V K PID C6 C5 H Servo valve current I V = ( VL) (L) I J2 J C C K2 H2 V V H K V28 V a 26c 2a 2c 6a 6a c 8c a 8a 2c 8c 22c +5 V M 5 V D C Enable Reserve Contact loading V = 2 V / I =,5 P T +VL (L) +VL (L) Relays K and K as well as the PID controller are special models and are identified by a VT number when ordering. Positive command value at port c gives a flow at the servo valve from P to. Positive command value at port 2a gives a flow at the servo valve from P to. Ordering code VT-SR 2 S X 2-pin blade connector to DIN 62 form D = S (for installation in Euro-card racks and card holders) Series to 9 = X ( to 9: unchanged technical data and connection allocations) * Further details in clear text = without ± 5 V voltage regulator = with ± 5 V voltage regulator 6/6 Mannesmann Rexroth Corporation Rexroth Hydraulics Div., Industrial, 25 City Line Road, ethlehem, P 87-2 Tel. (6) 69-8 Fax: (6) Rexroth Hydraulics Div., Mobile, 7 Old Mansfield Road, Wooster, OH 69-9 Tel. () 26- Fax: () 26- ll rights reserved Subject to revision Printed in U.S..