Proportional directional valve, pilot-operated, with integrated electronics (OBE)

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1 Proportional directional valve, pilot-operated, with integrated electronics (OBE) Type WFCE RE 943 Edition: 7- Replaces: 6- Size 6 5 Component series X Maximum operating pressure 4 bar Maximum flow 5 l/min ( p = 5 bar) H869 Features /-way version Cartridge valve Robust Pressure resistance up to 4 bar High vibration resistance (acc. to DIN EN668-) Ambient temperature up to +6 C Precise High response sensitivity and little hysteresis Reliable High-quality and proven design Normalized Installation dimensions according to ISO 7368 Flexible In connection with a pressure compensator pressurecompensated flow control possible Safe Fail-safe position of the main stage in case of power failure, cable break or disconnected enable Contents Features Ordering code Function, section, symbol 3 Technical data 4, 5 Integrated electronics (OBE) 6 Block diagram/controller function block 6; 7 Electrical connections and assignment 8 Characteristic curves 9 8 Dimensions 9 5 Accessories 6, 7 Further information 8 RE 943, edition: 7-, Bosch Rexroth AG

2 /8 WFCE Proportional directional valve Ordering code WFC E S L X / / 4 * main ports Pilot-operated proportional directional valve (cartridge valve) WFC 3 With integrated electronics (OBE) E 4 Size 6 6 Size 5 5 Size 3 3 Size 4 4 Size Seat control spool S Rated flow at 5 bar pressure differential 6 Size 6 5 l/min 5 6 l/min 6 Size 5 l/min 33 l/min 33 Size 3 3 l/min 3 65 l/min 65 Size 4 5 l/min 5 94 l/min 94 Size 5 l/min 5 l/min 5 Flow characteristic 7 Linear L 8 Component series 9 ( 9: unchanged installation and connection dimensions) X Seal material 9 NBR seals M FKM seals V Observe compatibility of seals with hydraulic fluid used. (Other seals upon request) Supply voltage 4 V 4 Electrical interface... V DC (connector 6+PE) A... V DC (connector +PE) B 4... ma (connector +PE) G Further details in the plain text * Bosch Rexroth AG, RE 943, edition: 7-

3 Proportional directional valve WFCE 3/8 Function, section, symbol Set-up The pilot-operated proportional directional valve type WFCE basically consists of: Cover () Main stage () Pilot control valve with proportional solenoid (3) Integrated electronics with position transducer and analog interface (4) The integrated electronics (OBE) compare the specified command value to the position actual value of the control spool of the main stage (). In case of control deviations, the solenoid of the pilot control valve (3) is activated. In this way, the control spool is adjusted. Depending on the control deviation, the control chamber of the main stage () is either pressurized with pilot oil (the main stage closes) or unloaded (the main stage opens). Stroke and orifice cross-section are controlled proportionally to the command value until the control deviation is remedied. For proper function, the following has to be observed: Direction of flow A B (X connected to A) Direction of flow B A (X connected to B) 4 3 Failure of supply voltage If the minimum supply voltage fails or is fallen below, the enable is disconnected (only interfaces B and G) and in case of a cable break of the solenoid conductor, the integrated electronics (OBE) will de-energize the solenoid of the pilot control valve (3). The control spool of the main stage () moves securely to its seat using the pressure available at port X and the force of the main stage spring and blocks the flow between A and B. Flow control function In connection with a pressure compensator, the pilotoperated proportional directional valve can be used for the pressure-compensated control of a flow. Symbol B X Y A A B Notices: Representation according to DIN ISO 9-. Direction of flow A B (X connected to A) B A (X connected to B) RE 943, edition: 7-, Bosch Rexroth AG

4 4/8 WFCE Proportional directional valve Technical data (For applications outside these parameters, please consult us!) general Size NG Weight kg Installation position Any Ambient temperature range C (NBR seals) (FKM seals) Maximum storage time Years (if the storage conditions are observed; refer to the operating instructions 76-B) Vibration resistance Sine test according to DIN EN Hz / maximum of g / cycles / 3 axes Noise test according to DIN EN Hz / g RMS / 3 g peak / 3 min. / 3 axes Transport shock according to DIN EN g / ms / 3 axes Maximum relative humidity (no condensation) % 95 Maximum surface temperature C 5 MTTFd value according to EN ISO 3849 Years 75 (for further details see data sheet 8) hydraulic Maximum operating pressure Minimum operating pressure Port A, B bar 4 Port A (A B) bar Port B (B A) bar Port X bar 4 Port Y bar Maximum pilot pressure Maximum return flow pressure Rated flow ( p = 5 bar) ) ) l/min 5, 6, 33 3, 65 5, 94, 5 Maximum pilot flow ) l/min Leakage flow Pilot control valve (at bar) cm 3 /min < 5 < < < 4 < 4 Main stage Interface A ( V) cm 3 /min A B and B A blocked in a leakage-free manner (valve in seat position) Interface B ( V) cm 3 /min Depending on p, see characteristic curves on page 9 8 Interface G (4 ma) cm 3 /min Depending on p, see characteristic curves on page 9 8 Interface B, G 3; 4; 5) cm 3 /min A B and B A blocked in a leakage-free manner (valve in seat position) Pilot volume Main stage ) cm Direction of flow Internal pilot oil supply A B A connected to X B A B connected to X External pilot oil supply A B Pressure in X pressure in A B A Pressure in X pressure in B Hydraulic fluid See table page 5 Viscosity range Recommended mm /s Maximum admissible mm /s 5 38 Hydraulic fluid temperature range (flown-through) C - +6 Maximum admissible degree of contamination of the hydraulic fluid cleanliness class according to ISO 446 (c) Class 8/6/3 5) ) Flow for deviating p: q x = q V nom x p x 5 ) Stepped input signal (seat position at %, pilot pressure bar) 3) Pin 3: V 4) Internal pilot oil supply: Observe leakage flow A X or B X via pilot control valve to Y (see technical data leakage flow pilot control valve) 5) External pilot oil supply: Leakage flow from A or B via the pilot control valve is avoided; a minimum leakage flow X B is, however, possible 6) The cleanliness classes specified for the components must be adhered to in hydraulic systems. Effective filtration prevents faults and simultaneously increases the life cycle of the components. For the selection of the filters, see Bosch Rexroth AG, RE 943, edition: 7-

5 Proportional directional valve WFCE 5/8 Technical data (For applications outside these parameters, please consult us!) Hydraulic fluid Classification Suitable sealing Standards Data sheet materials Mineral oils HL, HLP NBR, FKM DIN Flame-resistant Water-free HFDU based on glycol FKM ISO 9 9 Important information on hydraulic fluids: The ignition temperature of the hydraulic fluid used must be 5 K For further information and data on the use of other hydraulic higher than the maximum surface temperature. fluids, please refer to the data sheets above or contact us. There may be limitations regarding the technical valve data (temperature, pressure range, life cycle, maintenance intervals, etc.). static / dynamic Hysteresis % <. Range of inversion % <. Response sensitivity % <. Manufacturing tolerance q Vmax % Temperature drift %/4 K < Zero compensation Ex plant ±% electrical, integrated electronics (OBE) Relative duty cycle % (continuous operation) Protection class according to EN 659 IP 65 with mating connector mounted and locked Supply voltage Nominal voltage VDC 4 Lower limit value VDC 8 Upper limit value VDC 36 Maximum admissible Vss.5 (Comply with absolute supply voltage limit value) residual ripple Current consumption Maximum A Impulse current A 3 Maximum power consumption W 5 Functional earth and screening See connector pin assignment (CE-compliant installation) page 8 Required fuse protection, external A.5 time-lag Adjustment Calibrated in the plant, see characteristic curves page Conformity CE according to EMC Directive 4/8/EC tested according to EN 6-6- and EN RE 943, edition: 7-, Bosch Rexroth AG

6 6/8 WFCE Proportional directional valve Integrated electronics (OBE) Function. Switch-on procedure/fault behavior After applying the supply voltage of 4 V, the electronics are ready for operation provided that the following conditions are met: Supply voltage U B > 8 V DC Connection to solenoid not interrupted Command value line not interrupted and command value >.7 ma (interface "G" only) If one of the conditions is not met, the controllers and the output stage will be blocked and the ready for operation signal to pin (interface "B" and "G" only) will be set to V.. Actual value output signals Electrical interfaces "A" (pin F) and "B" (pin 6) "A":.35 V + V corresponds to % % valve opening; orifice spool in seat position if actual value < -.5 V "B": V + V corresponds to % % valve opening; orifice spool in seat position if actual value < -.5 V Electrical interface "G" (pin 6) 4 ma + ma corresponds to % % valve opening; orifice spool in seat position if actual value <.7 ma Block diagram/controller function block: Version 6 + PE Command value Command value reference D E Protection circuit Amplifier differential U/I U Command value enable Y X & Short-circuit of solenoid Cable break of solenoid Actual value Actual value reference Supply voltage 4 V V F C Protection circuit Inversepolarity protection VS A B Protection circuit Actual value output U/I U DC DC Controller +5 V, ma Vref = -3,3V +3,3V, ma M +(7,5-8) V, 5 ma (7,5-8) V, 5 ma U I Output stage Demodulator Sinus oscillator Position transducer Notices: Electrical interface "A" in opening direction: Valve active if command value.5 V in closing direction: Valve deactivated if command value.3 V ("on seat") Electrical interfaces "B" and "G" in opening direction: Valve active if enable pin 3 is set, command value > - V ("B") or > ma ("G") in closing direction: Valve deactivated if enable pin 3 is not set, command value < - V ("B") or < ma ("G") ("on seat") Command value "B" and "G" "A" Without enable V > V.35 V >.35 V <.5 V >.5 V Bosch Rexroth AG, RE 943, edition: 7-

7 Proportional directional valve WFCE 7/8 Block diagram/controller function block: Version + PE Enable input Command value Command value reference Ready for operation Actual value Actual value reference free free free Supply voltage 4 V V Protection 8 circuit Inversepolarity 9 protection Protection circuit VS Protection circuit Amplifier differential U/I U Actual value output U/I U DC Enable Cable break (G) DC +5 V, ma Vref = -3,3V +3,3V, ma M & +(7,5-8) V, 5 ma (7,5-8) V, 5 ma Controller Short-circuit of solenoid Cable break of solenoid U I Output stage Demodulator Sinus oscillator Position transducer Notices: Electrical interface "A" in opening direction: Valve active if command value.5 V in closing direction: Valve deactivated if command value.3 V ("on seat") Electrical interfaces "B" and "G" in opening direction: Valve active if enable pin 3 is set, command value > - V ("B") or > ma ("G") in closing direction: Valve deactivated if enable pin 3 is not set, command value < - V ("B") or < ma ("G") ("on seat") Command value "B" and "G" "A" Without enable V > V.35 V >.35 V <.5 V >.5 V RE 943, edition: 7-, Bosch Rexroth AG

8 8/8 WFCE Proportional directional valve Electrical connections and assignment Connector pin assignment Pin Core Interface assignment 6 + PE + PE marking ) "A" (6 + PE) "B"( + PE) "G"( + PE) A Supply voltage 4 VDC B GND C 3 3 Reference potential actual value Enable input 4 VDC (high V; low 5 V) D 4 4 Command value V Command value 4 ma E 5 5 Reference potential command value F 6 6 Actual value V Actual value 4 ma 7 7 Reference potential actual value Switching output 4 V fault-free operation (supply voltage - V)/fault ( V) or power circuit signal), maximum 5 ma PE PE green-yellow Functional earth (directly connected to the valve housing) F E PE A D B C 3 F PE 6 7 ) Core marking of the connection lines for mating connector with cable set, see accessories, page 6 and 7 Bosch Rexroth AG, RE 943, edition: 7-

9 Proportional directional valve WFCE 9/8 Characteristic curves: Size 6 (measured with HLP46, ϑ Oil = 4 ±5 C) Flow/signal function 4 Version "5" (A B; B A) Command value in V 4 Version "6" (A B; B A) Command value in V Pressure differential bar Pressure differential bar 3 Pressure differential 5 bar RE 943, edition: 7-, Bosch Rexroth AG

10 /8 WFCE Proportional directional valve Characteristic curves: Size 6 (measured with HLP46, ϑ Oil = 4 ±5 C) Leakage as a function of the pressure differential (Command value: A.5 V; B V; G 4 ma) Pressure differential in bar Scatter range Transition function with stepped electric input signals (p A = bar) Stroke in % Time in ms Step responses in %: Frequency response (p A = bar) -7 Amplitude ratio in db Frequency in Hz Phase angle in Signals in %: Bosch Rexroth AG, RE 943, edition: 7-

11 Proportional directional valve WFCE /8 Characteristic curves: Size 5 (measured with HLP46, ϑ Oil = 4 ±5 C) Flow/signal function 4 35 Version "" (A B; B A) Command value in V 8 Version "33" (A B; B A) Command value in V Pressure differential bar Pressure differential bar 3 Pressure differential 5 bar RE 943, edition: 7-, Bosch Rexroth AG

12 /8 WFCE Proportional directional valve Characteristic curves: Size 5 (measured with HLP46, ϑ Oil = 4 ±5 C) Leakage as a function of the pressure differential (Command value: A.5 V; B V; G 4 ma) Pressure differential in bar Scatter range Transition function with stepped electric input signals (p A = bar) Stroke in % Time in ms Step responses in %: Frequency response (p A = bar) -7 Amplitude ratio in db Frequency in Hz Phase angle in Signals in %: Bosch Rexroth AG, RE 943, edition: 7-

13 Proportional directional valve WFCE 3/8 Characteristic curves: Size 3 (measured with HLP46, ϑ Oil = 4 ±5 C) Flow/signal function 7 6 Version "3" (A B; B A) Command value in V 4 Version "65" (A B; B A) Command value in V Pressure differential bar Pressure differential bar 3 Pressure differential 5 bar RE 943, edition: 7-, Bosch Rexroth AG

14 4/8 WFCE Proportional directional valve Characteristic curves: Size 3 (measured with HLP46, ϑ Oil = 4 ±5 C) Leakage as a function of the pressure differential (Command value: A.5 V; B V; G 4 ma) Pressure differential in bar Scatter range Transition function with stepped electric input signals (p A = bar) Stroke in % Time in ms Step responses in %: Frequency response (p A = bar) -7 Amplitude ratio in db Frequency in Hz Phase angle in Signals in %: Bosch Rexroth AG, RE 943, edition: 7-

15 Proportional directional valve WFCE 5/8 Characteristic curves: Size 4 (measured with HLP46, ϑ Oil = 4 ±5 C) Flow/signal function 4 Version "5" (A B; B A) Command value in V Version "94" (A B; B A) Command value in V 3 Pressure differential bar Pressure differential bar 3 Pressure differential 5 bar RE 943, edition: 7-, Bosch Rexroth AG

16 6/8 WFCE Proportional directional valve Characteristic curves: Size 4 (measured with HLP46, ϑ Oil = 4 ±5 C) Leakage as a function of the pressure differential (Command value: A.5 V; B V; G 4 ma) Pressure differential in bar Scatter range Transition function with stepped electric input signals (p A = bar) Stroke in % Time in ms Step responses in %: Frequency response (p A = bar) -7 Amplitude ratio in db Frequency in Hz Phase angle in Signals in %: Bosch Rexroth AG, RE 943, edition: 7-

17 Proportional directional valve WFCE 7/8 Characteristic curves: Size 5 (measured with HLP46, ϑ Oil = 4 ±5 C) Flow/signal function Version "" (A B; B A) Command value in V Version "5" (A B; B A) Command value in V Pressure differential bar Pressure differential bar 3 Pressure differential 5 bar RE 943, edition: 7-, Bosch Rexroth AG

18 8/8 WFCE Proportional directional valve Characteristic curves: Size 5 (measured with HLP46, ϑ Oil = 4 ±5 C) Leakage as a function of the pressure differential (Command value: A.5 V; B V; G 4 ma) Pressure differential in bar Scatter range Stroke in % Transition function with stepped electric input signals (p A = bar) Time in ms Step responses in %: Frequency response (p A = bar) 5-7 Amplitude ratio in db Frequency in Hz Phase angle in Signals in %: Bosch Rexroth AG, RE 943, edition: 7-

19 Proportional directional valve WFCE 9/8 Dimensions: Size 6 (dimensions in mm) ,5 5 3,5 Ø5g6 Ø3e ,5 65,/ Rzmax 4 Required surface quality of the valve contact surface Notice: The dimensions are nominal dimensions which are subject to tolerances. Item explanations and valve mounting screws see page 5. RE 943, edition: 7-, Bosch Rexroth AG

20 /8 WFCE Proportional directional valve Dimensions: Size 5 (dimensions in mm) ,5 4,5 Ø34g6 Ø45e ,/ Rzmax 4 Required surface quality of the valve contact surface Notice: The dimensions are nominal dimensions which are subject to tolerances. Item explanations and valve mounting screws see page 5. Bosch Rexroth AG, RE 943, edition: 7-

21 Proportional directional valve WFCE /8 Dimensions: Size 3 (dimensions in mm) ,5 5 Ø45g6 Ø6e9 75 4,/ Rzmax 4 Required surface quality of the valve contact surface Notice: The dimensions are nominal dimensions which are subject to tolerances. Item explanations and valve mounting screws see page 5. RE 943, edition: 7-, Bosch Rexroth AG

22 /8 WFCE Proportional directional valve Dimensions: Size 4 (dimensions in mm) ,5 6,5 Ø55g6 Ø75e ,/ Rzmax 4 Required surface quality of the valve contact surface Notice: The dimensions are nominal dimensions which are subject to tolerances. Item explanations and valve mounting screws see page 5. Bosch Rexroth AG, RE 943, edition: 7-

23 Proportional directional valve WFCE 3/8 Dimensions: Size 5 (dimensions in mm) Ø68g6 Ø9e ,/ Rzmax 4 Required surface quality of the valve contact surface Notice: The dimensions are nominal dimensions which are subject to tolerances. Item explanations and valve mounting screws see page 5. RE 943, edition: 7-, Bosch Rexroth AG

24 4/8 WFCE Proportional directional valve Installation bore (dimensions in mm) H +, H5 H6 H3 +, H7 H8 L L7±, 9, A A 5 ØD y z A B 5 X Y H9 ØD3 H Ø,3 A ØD 9 ØD4 y 8 L6±, ØD6 7 A A 6 ØD6 L4±, L5±, L5±, y, / L3 L Section A A D5 D7H3 x = Rzmax 4 L4±, Installation dimensions according to DIN ISO 7368 NG ØDH ØD ØD max. ØD ØD4H D5 M8 M M6 M M max. ØD ØD7H H H ) H H H H H H H min. H9 ) min. H L L L L L L L NG Installation dimensions according to DIN ISO ISO 7368-BA-6--A 5 ISO 7368-BB-8--A 3 ISO 7368-BC-9--A 4 ISO 7368-BD---A 5 ISO 7368-BE---A y = Rzmax 8 Tolerances according to: General tolerances ISO 768-mK H H4 ) Bore center at ØD3 max. z = Rz Item explanations and valve mounting screws see page 5. ) Control dimension Bosch Rexroth AG, RE 943, edition: 7-

25 Proportional directional valve WFCE 5/8 Dimensions Cover Main stage 3 Pilot control valve with proportional solenoid 4 Integrated electronics with position transducer and analog interface 5 Space required to remove the mating connectors 6 Port X 7 Port Y 8 Locating hole for locking pin 9 Depth of fit Control dimension Port B may be at any position around the central axis of port A. However, it must be observed that the mounting bores and the control bores are not damaged. If a different diameter is used for port B than indicated in the dimensional table, the distance from the cover support surface to the bore center must be calculated. Valve mounting screws (separate order) Size Hexagon socket head cap screws Material number 6 4 hexagon socket head cap screws ISO M8 x N67F (galvanized according to Bosch standard N67F8 7) Tightening torque M A = 35 ±5 Nm 5 4 hexagon socket head cap screws ISO M x N67F (galvanized according to Bosch standard N67F8 7) Tightening torque M A = 5 ±5 Nm 3 4 hexagon socket head cap screws ISO M6 x N67F (galvanized according to Bosch standard N67F8 7) Tightening torque M A = 65 ±5 Nm hexagon socket head cap screws ISO M x N67F 8 7 (galvanized according to Bosch standard N67F8 7) Tightening torque M A = 5 ±5 Nm 9556 RE 943, edition: 7-, Bosch Rexroth AG

26 6/8 WFCE Proportional directional valve Accessories (separate order) Connector connection, version 6 + PE Mating connector Version Material number Round connector according to EN Mating connector (assembly kit) for a cable diameter of R967 (7-pole, plastic variant) mm Mating connector with 3 m cable, 7 x.75 mm, assembled R94483 Mating connector with 5 m cable, 7 x.75 mm, assembled R9449 Mating connector with m cable, 7 x.75 mm, assembled R94496 B C D A F E 9 Ø7 Round connector according to EN (7-pole, metal design) Mating connector (assembly kit) for a cable diameter of mm R9389 B C A D F E 85 Ø8,4 Bosch Rexroth AG, RE 943, edition: 7-

27 Proportional directional valve WFCE 7/8 Accessories (separate order) Connector connection, version + PE Mating connector Version Material number Mating connector according to DIN EN (-pole, metal design) Mating connector (assembly kit) for a cable diameter of... 5 mm Mating connector with 5 m cable, x.75 mm with cable shield, assembled Mating connector with m cable, x.75 mm with cable shield, assembled SW R968 R97854 R9785 SW M6 x,5 ~9 Ø8 Mating connector according to DIN EN ( pole, plastic variant) Mating connector (assembly kit) Mating connector with x 5 m cable, supply line (3 x. mm ) and signal line ( x.4 mm ) separated, with cable shield, assembled Mating connector with x m cable, supply line (3 x. mm ) and signal line ( x.4 mm ) separated, with cable shield, assembled R R93356 R RE 943, edition: 7-, Bosch Rexroth AG

28 8/8 WFCE Proportional directional valve Further information Hydraulic fluids on mineral oil basis Data sheet 9 Environmentally compatible hydraulic fluids Data sheet 9 Flame-resistant, water-free hydraulic fluids Data sheet 9 Flame-resistant hydraulic fluids - containing water (HFAE, HFAS, HFB, HFC) Data sheet 93 Reliability characteristics according to EN ISO 3849 Data sheet 8 Hydraulic valves for industrial applications Operating instructions 76-B Selection of filters Information on available spare parts Bosch Rexroth AG Hydraulics Zum Eisengießer 9786 Lohr am Main, Germany Phone +49 () 93 5 / 8- documentation@boschrexroth.de This document, as well as the data, specifications and other information set forth in it, are the exclusive property of Bosch Rexroth AG. It may not be reproduced or given to third parties without its consent. The data specified above only serve to describe the product. No statements concerning a certain condition or suitability for a certain application can be derived from our information. The information given does not release the user from the obligation of own judgment and verification. It must be remembered that our products are subject to a natural process of wear and aging. Bosch Rexroth AG, RE 943, edition: 7-

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