Proportional pressure relief valve Types DBE(M) and DBE(M)E

Transcription

1 RE /02.99 Replaces: Proportional pressure relief valve Types DE(M) and DE(M)E Nominal size 32 1) Series 3X Maximum operating pressure 3 bar Maximum flow 600 L/min H/ ) NS 10; 25, Series 5X see RE Type DE -3X/...G24K4... with plug-in connector and associated control electronics (separate order) Overview of contents Contents Page Features 1 Ordering details 2 Preferred types 2 Symbols 2 Function, section 3 Technical data 4 and 5 Control electronics 5 and 6 Electrical connections 5 Characteristic curves 7 Unit dimensions 8 Features Pilot operated valve for limiting a system pressure Proportional solenoid operation For subplate mounting: Porting pattern to DIN , form E Subplates to catalogue sheet RE , (separate order, see page 8) Optional additional maximum pressure limitation by means of a spring loaded pilot control valve Control electronics type DE(M): nalogue amplifier VT-VSP1-1 in Eurocard format nalogue amplifier VT 0 Digital amplifier VT-VSPD-1 in Eurocard format Integrated control electronics for type DE(M)E: Low example spread of the command value pressure characteristic curve Independently adjustable up and down ramps DE(M); DE(M)E 1/8

2 Ordering details DE 3X/ G24 * Proportional pressure reducing valve Without maximum pressure limitation = No code With maximum pressure limitation = M For external control electronics = No code With integrated control electronics = E Nominal size 32 = Series to 39 = 3X ( to 39: unchanged installation and connection dimensions) Pressure stage Up to bar = Up to 100 bar = 100 Up to bar = Up to 315 bar = 315 Up to 3 bar = 3 Internal pilot oil supply, external pilot oil drain = External pilot oil supply external pilot oil drain = X Further details in clear text M = NR seals, suitable for mineral oil (HL, HLP) to DIN V = FKM seals Electrical connections for DE; DEM: K4 = With component plug DIN 43 6-M2 Without plug-in connector Plug-in connector separate order, see page 5 for DEE; DEME: K31 = With component plug to E DIN M6-3 Without Plug-in connector Plug-in connector separate order, see page 5 G24 = Supply voltage to the control electronics 24 V DC Special protection versions on reqest! Preferred types Material no. Type DEME DEME -3X/G24K31M DEME -3X/100G24K31M DEME -3X/G24K31M DEME -3X/315G24K31M DEME -3X/3G24K31M Symbols Type DE(E) -3X/ Type DE(E) -3X/ X Type DEM(E) -3X/ Type DEM(E) -3X/ X X X Rexroth Hydraulics 2/8 DE(M); DE(M)E

3 Function, section Valve types DE and DEM are pilot operaed pressure relief valves. They are used to limit the pressure in a hydraulic system. With these valve it is possible, in relation to the electrical command value, to infinitely adjust the pressure to be limited. These valves basically consist of the pilot control valve (1) with proportional solenoid (2) and the main valve (3) with main spool insert (4). Type DE The adjustment of the pressure is command value dependent via a proportional solenoid (2). The pressure present in port acts on the underside of the main spool (4). t the same time this pressure acts on the spring loaded side of the main spool (4) via control line (8) which is fitted with orificies (5, 6, 7). The hydraulic force acts on the pilot poppet (10) via valve seat (9) against the force proportional solenoid (2). When the hydraulic force over comes the solenoid force then the pilot poppet (10) opens. Due to the fact that the pilot oil can now flow to tank via port (12) a pressure drop occurs at the orifices (5, 6) which acts on the main spool and lifts it against the force of the return spring (10). The connection from to is opened and there is no longer any increase in pressure Type DEM Optionally the valve can be supplied with an additional spring loaded pilot control valve (13) for maximum pressure safety (redundant pressure safety). It is recommended that this version is always selected! When applying these valves take into account the guidelines stated on page 4. Types DEE and DEME (with integrated control electronics) The function and design of these valves, with the exception of the integrated control electronics, is basically the same as the types DE and DEM. The control electronics which are located in the housing (14) receive the supply and command value voltages via the plug-in connector (15). The command value pressure characteristic curve (zero point at valve seat (9) and the increase at the I max potentiometer (R) in the control electronics) is factory pre-set with a low example spread. t the two potentiometers it is possible to independently adjust the ramp times for increase in pressure and decrease in pressure. For further details regarding the integrated control electronics, see pages 5 and Port "X" Plugged with internal pilot oil supply 12 Port "" External pilot oil drain separate and zero pressure to tank Section a a Type DE... X 13 Type DEM (with maximum pressure safety) Type DE(M)E - DE(M); DE(M)E 3/8 Rexroth Hydraulics

4 Technical data (for applications outside these parameters, please consult us!) General Installation optional Storage temperature range C 20 to + 80 mbient DE and DEM C 20 to + 70 temperature range DEE and DEME C 20 to + Weight DE and DEM kg 6.0 DEE and DEME kg 6.2 Hydraulic (measured at ν = 41 mm 2 /s and ϑ = C) Max. perm. operating pressure Ports, and X bar 3 Port separate and zero pressure to tank Max. settable pressure Pressure stage bar bar Pressure stage 100 bar bar 100 Pressure stage bar bar Pressure stage 315 bar bar 315 Pressure stage3 bar bar 3 Min. settable pressure at port at zero command value bar see characteristic curves on page 7 Max. pressure safety (infinitely adjustable) djustable pressure range: Setting as supplied: Pressure stage bar bar to 70 up to 70 bar Pressure stage 100 bar bar to 1 up to 1 bar Pressure stage bar bar 90 to 2 up to 2 bar Pressure stage 315 bar bar 1 to 3 up to 3 bar Pressure stage 3 bar bar 180 to 390 up to 390 bar Max. permissible flow L/min 600 Pilot flow L/min 0.7 to 2 Pressure fluid Mineral oil (HL, HLP) to DIN , further pressure fluids on request! Pressure fluid temperature range C 20 to + 80 Viscosity range mm 2 /s 15 to 380 Degree of contamination Maximum permissible degree Filter with a minimum of contamination of the retention rate of pressure fluid is to NS 1638 ß X 75 is recommended class 9 x = 10 Hysteresis (see command value pressure char. curve on page 7) % ± 1.5 of max. settable pressure Repeatability % < ± 2 of max. settable pressure Linearity % ± 3.5 of max. settable pressure Example spread of the DE and DEM % ± 2.5 of max. settable pressure com. value pressure char. DEE and DEME % ± 1.5 of max. settable pressure curve, relating to the hysteresis char. curve, pressure increasing Stepped response T u + T g % ms 1 dependent on the flow and the % ms 1 system pipe work volume (in ) Rexroth Hydraulics 4/8 DE(M); DE(M)E

5 Technical data (for applications outside these parameters, please consult us!) Electrical Supply voltage 24 V DC Min. control current m 100 Max. control current DE and DEM m 800 DEE and DEME m 1600 Coil resistance Cold value at 20 C Ω 19.5 Max. warm value Ω 28.8 Duty % 100 Electrical connections DE and DEM with component plug to DIN 43 6-M2 1) Separate order, plug-in connector to DIN 43 6-F2/Pg11 1) see below DEE and DEME with component plug to E DIN M6-3 plug-in connector to E DIN F6-3/Pg11 1) Valve protection to DIN 40 0 IP 65 Control electronics For DEE and DEME integrated into the valve, see page 6 For DE and DEM mplifier in Eurocard format nalogue VT-VSP1-1 to catalogue sheet RE 111 (separate order) VT 0 to catalogue sheet RE Digital VT-VSPD-1 to catalogue sheet RE 123 RE /02.99 Note: For details regarding the environmental simulation test covering EMC (electro-magnetic compatibilitiy), climate and mechanical loading see RE U (declaration regarding environmental compatibility). Electrical connections For types DE and DEM (for external control electronics) Plug-in connector to DIN 43 6-F2/Pg11 Separate order under material no , ,5 53 Ø22,5 Connections at component plug PE 1 2 Connections at plug-in connector For types DEE and DEME (with integrated control electronics) Plug-in connector to E DIN F6-3/Pg11 Separate order under material no (plastic version) 91 0,5 (seal) PE 1 2 To amplifier F For pin allocation see block circuit diagram on page 6 Ø6,5 11 E D C DE(M); DE(M)E 5/8 Rexroth Hydraulics

6 Integrated control electronics for types DEE, DEME Function The control of the integrated electronics is at the two differential amplifier connections D and E. The ramp generator generates a delayed increase or decrease of the solenoid current from a command value jump (0 to 10 V or 10 to 0 V). t the potentiometer R14 the increase time of the solenoid current may be set and the decrease time at potentiometer R13. The maximum ramp time of 5 s is only possible over the complete command value range. With smaller command value changes the ramp time is accordingly shortened. The command value solenoid current characteristic curve is matched to the valve via the characteristic curve generator in such a way that any unlinearities are compensated for in the hydraulics and thus a linear command value pressure characteristic curve is formed. The current controller controls the solenoid current independently from the solenoid coil resistance. t the potentiometer R the increase of the command value current characteristic curve and thus also the increase of the command value pressure characteristic curve of the proportional pressure valve may be altered. Potentiometer R43 is used for the setting the bias current. This setting should not be altered. If necessary the zero point of the command value pressure characteristic curve may be set at the valve seat. The power stage of the electronics for the control of the proportional solenoid is formed by a chopper amplifier. It is pulse width modulated with a pulse frequency of 0 Hz. The solenoid current may be measured at the test points MP1and MP2. voltage decrease of V at the measuring resistance equals a solenoid current of 1.6. lock circuit diagram / Terminal connection of the integrated control electronics Com. value 0 to 10 V D + Differential amplifier U Ramp generator R 14 R 13 Characteristic curve generator Current controller I max I min +U Chopper amplifier 0V ref. potential Supply voltage: U eff : 22 to 33 V 0 V E F C + n.c. n.c. = U = Ramp "up" Power supply Ramp "down" +U +7,5 V Internal ref. point -7,5 V R I R 43 0 Hz = Oscillator Measuring resistance R=0,22 Ω 0 V Solenoid MP1 1,6 = 0,352 V MP2 Supply voltage Power supply with recification One phase rectification or three phase bridge: U eff = 22 to 33 V Residual ripple factor at power supply: < 5 % Output current: eff I = max. 1.4 Supply cable: Recommendation 5 core 0.75 or 1 mm 2 with protective conductor and screen External diameter 6.5 to 11 mm Screen on 0 V supply voltage Max. permissible length 100 m The minimum supply voltage at the power supply depends on the length of the supply cable (see diagram). With lengths > m a capacitor of 2 µf imust be installed near the valve in the supply line. Min. supply voltage in V ,75 mm 2 1 mm Length of supply cable in m Rexroth Hydraulics 6/8 DE(M); DE(M)E

7 Characteristic curves (measured at ν = 41 mm 2 /s and ϑ = C) Pressure in port in bar Pressure in port in relation to the flow Flow in L/min Min. settable pressure in port in bar RE / /02.99 Min. settable pressure in port at zero command value Flow in L/min Note: So that the minimum settable pressure can be achieved the bias current must not exceed 100 m. Pressure in port in relation to the command value (measured at a flow of 27 L/min) Pressure in port in bar Pressure stage bar Dead zone 10 5 Pressure in port in bar Pressure stage 100 bar Dead zone Pressure in port in bar Pressure stage bar Dead zone Pressure in port in bar Pressure stage 315 bar Dead zone Pressure in port in bar Pressure stage 3 bar Dead zone DE(M); DE(M)E 7/8 Rexroth Hydraulics

8 Unit dimensions (Dimensions in mm) ,5 Ø 23; 1 16 X1 Ø 12,3; 1, ,5 3 X X Ø 31 M8x ,8 41,5 44,5 12,7 76, ,9 Ø 23; 1 G 1/4 Ø 40,7; 2, Ø 20 Ø 28 Pg (with integrated control electronics) Required surface finish of mating piece 0,01/100mm R 4 max R R-ring in ports, : x 3.53 x 3.53 R-ring in port X: 9.81 x 1.5 x Plug-in connector to DIN 43 6-F2/Pg Plug-in connector E DIN F6-3/Pg11 3 Space required to remove plug-in connector 4 Space required for the cable bend radius when removing the plug-in connector 5 Cable bend radius 6 Integrated control electronics (types DEE, DEME) with component plug 7 Name plate 8 Maximum pressure limitation (types DEM, DEME) When this valve is installed, please take into account the guidlines stated on pages 3 and 4. 9 External pilot oil supply, optionally at ports X or X1 10 External pilot oil drain, always external, separate and at zero pressure to tank 11 Locating pin Ø 6 mm Subplates to catalogue sheet RE and valve fixing screws must be ordered separately. Subplates: G 410/01 (G 1 1/4) G 411/01 (G 1 1/2) Valve fixing screws: M18 x DIN ; M = 160 Nm Mannesmann Rexroth G Rexroth Hydraulics D Lohr am Main Jahnstraße 3-5 D Lohr am Main Telefon / 18-0 Telefax / Telex Mannesmann Rexroth Limited Cromwell Road, St Neots, Huntingdon, Cambs, PE19 2ES Tel: (01480) Fax: (01480) The specified data is for product description purposes only and may not be deemed to be guaranteed unless expressly confirmed in the contract. ll rights reserved Subject to revision 8/8 DE(M); DE(M)E