29 158/ Proportional Pressure Relief Valve Models DBE and ZDBE, Series 1X. Ordering code DBE 6 1X G24 1/ PSI (315 bar)

Transcription

1 RA 29 58/6.98 Proportional Pressure Relief Valve Models DBE and ZDBE, Series X Size 6 (R 3) PSI (35 bar)... 8 GPM (3 L/min) RA 29 58/6.98 Replaces: 5.94 Valve for limiting system pressure Operation by means of proportional solenoid Mounts on standard ISO , NPA/ANSI R 3 interface or subplates, see RA As sandwich plate valve (Model ZDBE; ZDBEE) Control electronics for Model DBE and ZDBE: electrical amplifier Model VT-VSPA (Eurocard format, separate order), see page 9 Model DBEE and ZDBEE with integrated control electronics Minimal typical control variation of the signal value pressure characteristic independently adjustable up and down ramp Ordering code H/A 3598/93 Model DBEE 6.. X/.. with integral control electronics Subplate mounted valve = No code Sandwich plate = Z Proportional pressure relief valve Without integral control electronics = No code With integral control electronics = E Size 6 = 6 Subplate mounted valve = No code Sandwich plate P T = VP Solenoid plug position, Model ZDBE Position of housing with control electronics, Model ZDBEE Housing with control electronics ) ) Solenoid plug = ) = 2 ) Valve attachment side (R ring depressions in housing) DBE 6 X G24 ) = 3 = 4 urther details to be written in clear text M = NBR seals suitable for petroleum oil (HM, HL, HLP) V = PM seals, suitable for phospate ester fluids (HD-R) Type of electrical connection K4= with component plug to DIN AM2 without plug-in connector for DBE; ZDBE: Z4 = angled plug to DIN for DBEE; ZDBEE: Z3 = Plug to E DIN B6-3/Pg K3 = Socket to E DIN AM6-3 No code = Without manual overrides N = ) With manual overrides G24 = Supply voltage for control electronics 24 V D.C. No code = Internal pilot oil discharge (Subplate mtg. up to Q max = 3.9 GPM (5 L/min) recommended) Y = External pilot oil discharge (only for subplate mounting) Maximum pressure setting 5 = PSI (5 bar) = PSI ( bar) 2 = PSI (2 bar) 35 = PSI (35 bar) X = Series to 9 ( to 9: externally interchangeable) ) Note: Accidental release of the emergency operator may lead to uncontrolled machine movements * /

2 RA 29 58/6.98 Symbols (on sandwich plate symbol: = component side, 2 = subplate side) P P T T A(Y) P A 2 B T unctional description Model DBE and ZDBE Proportional pressure relief valve, Model DBE and ZDBE are operated by means of a proportional solenoid. These valves are used to limit system pressure. Using these valves it is possible to achieve stepless settings of the system dependent on the electrical signal value. These valves basically consist of a proportional solenoid (), housing (2), valve cartridge (3), spool and pilot poppet (8). The proportional solenoid converts electric current proportionately into mechanical force. An increase in current causes a corresponding rise in solenoid force. The solenoid armature chamber is filled with hydraulic fluid and pressure-balanced. System pressure setting is carried out via the proportional solenoid () dependent on the signal value. Pressure arising from the system in channel P acts on the right hand side of the spool. At the same time the system pressure acts via the control line (6) (which is fitted with nozzle (5)) on the spring loaded side of the spool. System pressure at the pilot poppet (8) acts against the force of the proportional solenoid () via orifice (7). Once the system pressure has reached the pre-set value the pilot poppet (8) lifts from its seat. Depending on the model, pilot oil can now flow away externally via port A (Y) or internally into the tank, and this has the effect of limiting pressure on the spring loaded side of the spool. If the system pressure continues to rise slightly then the higher pressure on the right hand side of the spool pushes to the left into control position P to T. At a minimum pilot current - with a signal value corresponding to zero - the minimum set pressure will be at a minimum. Note: To ensure optimum function the valve must be bled at startup Remove bleed screw (9), Allow air to escape, When no more bubbles appear, fix screw (9), The tank should be prevented from draining.where such installation conditions exist, a check valve should be used in the tank line [approximately 3 PSI (2 bar)] Model DBE 6.. Model DBEE and ZDBEE (with integral control electronics) A(Y) T P In terms of function and structure these valves correspond to Model DBE and ZDBE. In addition there is on the proportional solenoid a housing () with the control electronics. Supply and signal value voltages are applied at the plug (). The signal value pressure characteristic curve (zero point at valve insert (2) and the I max potentiometer (R3) in the control electronics) is factory set with low typical variation. It is possible to set the ramp time for pressure increase and decrease independently of each other on two potentiometers. 2/

3 Technical data (or applications outside these parameters please consult us) RA 29 58/6.98 General Weight DBEE and ZDBE lbs (kg) 5.2 (2.4) Installation position DBEE and ZDBEE lbs (kg) 5.5 (2.5) Ambient temperature range DBE and ZDBE ( C) ( ) any DBEE and ZDBEE ( C) (... 5) Hydraulic, measured at ν = 9 SUS (4 mm 2 /s), t = 22 (5 C) Operating pressure Ports P; P P2; A A2; B B2 PSI (bar) max. permissible 46 (35) Port T PSI (bar) 725 (5) Max. set pressure Pressure stage 5 PSI (bar) 725 (5) Pressure stage PSI (bar) 45 () Pressure stage 2 PSI (bar) 29 (2) Pressure stage 35 PSI (bar) 46 (35) Minimum set pressure at signal value PSI (bar) see performance curves page 6 Return pressure port A; with external pilot oil discharge (Y) separate and unpressurised to tank Max flow GPM (L/min) max. 7.9 (3) Pilot oil flow GPM (L/min) ( ) Hydraulic fluid Petroleum oils (HM, HL, HLP) Phosphate ester fluids (HD-R) luid cleanliness Classes 6/3 to 8/5 according to ISO 446. Therefore, we recommend a filter with a minimum retention rate of ß 75. luid temperature range ( C) ( ) Range of viscosity SUS (mm 2 /s) ( ) Hysteresis Repeatability Linearity ±.5 % of maximum set pressure < ± 2 % of maximum set pressure ± 3.5 % of maximum set pressure Minimal typical control variation of DBE and ZDBE ± 2.5 % of maximum set pressure signal value pressure curve, with reference DBEE and ZDBEE ±.5 % of maximum set pressure to the hystersis curve, pressure rising Stepped response T u + T g % 9 % ms approx. 8 Electrical Type of voltage 9 % % ms approx. 5 Min. pilot current ma Max. pilot current ma 6 Solenoid coil resistance Value when cold at 68 (2 C) Ω 5.4 Duty cycle DC Max. value warm Ω 7.8 continuous depending on installation Electrical connections DBE and ZDBE Plug connections to DIN 43 65/2-pin + PE/Pg DBEE and ZDBEE Unit plug: plug to E DIN B6-3/Pg Unit socket: socket to E DIN AM6-3 Valve insulation (DIN 4 5) exceeds NEMA class B (IP 65) Control electronics for DBE and ZDBE (to separate order) Amplifier in Eurocard format Model VT-VSPA (see page 9 or data sheet RA 3 ) for DBEE und ZDBEE integral in valve (see page 4) 3/

4 RA 29 58/6.98 Electrical connections, Plug-in connectors or models DBET, DBEMT Connection to component plug Connection to plug-in connector PE 2 PE 2 to amplifier Plug-in connector to DIN A2 Black, Pg (Z4) part no. RR Black, /2" NPT (Z45) part no. RR 39.8 (27.5).8 (27.5) 2.9 (53).42 (36) B Ø.89 (22.5).8 (3).8 (3) or types DBEE, ZDBEE Plug-in connector to E DIN B6-3/Pg (must be ordered separately under part no. RR 2 267) 3.58 (9).59 (5) E D A B C or pin allocation, see block circuit diagram on page 5 4/

5 Electrical connections Model DBE, ZDBE (without integral electronics) Coil connections Plug connections RA 29 58/6.98 Integral electronics for Model DBEE, ZDBEE unctional description Control of the integral electronics is via the differential amplifier inputs, D and E. The ramp generator produces a gradually rising or falling output solenoid current from the stepped command input signal ( to V or to V). The rise time is set at potentiometer R4 and the fall time at potentiometer R3. The full ramp time of 5 seconds is only available over the full command signal range. Smaller changes in signal value will reduce the ramp time accordingly. The control curve generator modifies the signal value/solenoid current curve in order to overcome any non-linearities in the hydraulics and to produce a linear signal value pressure curve. The current regulator controls the current independently of the coil resistance. PE 2 PE 2 to amplifier The gradient of the signal value/current curve and, therefore, that of the signal value pressure curve is modified by potentiometer R3. Potentiometer R43 is used to set the pilot current. The adjustment should not be changed.if necessary, the null point of the signal value pressure curve is adjustable. The power output stage of the electronics consists of a chopper amplifier. This is pulse width modulated at a frequency of 2 Hz. The solenoid current can be measured at test points MP and MP2. A voltage drop of.352 V at the test resistor corresponds to a solenoid current of.6 A. Terminal connections: Block circuit diagram for the integral electronics R4 R3 I min R43 up down Command value to V V reference potential Supply voltage: V eff : 22 to 33 V V D E C A B n.c. n.c. Differential amplifier V = V = R 4 Ramp 'Up' Power section Ramp generator R 3 Ramp 'Down' Operating curve generator +V +7.5 V internal reference point -7.5 V Current regulator I max I min R 3 I R 43 2 Hz = Oscillator +V Chopper amplifier Measuring resistance R=.22 Ω V Solenoid MP.6 A =.352 V MP2 R3 I max Supply voltage Power supply V eff = 22 to 33 V Residual ripple of power section: < 5 % Supply current : I eff = max..4 A Supply cable: Recommendation: 5-core 8 AWG or 6 AWG (.75 or mm 2 ) with shield Outer diameter.26 to.44 in (6.5 to.2 mm) Shield to V supply voltage Max. permitted length 33 ft ( m) The minimum supply voltage at the power section is dependent on the length of the supply cable (see diagram). or lengths of >6 ft (5 m) a 22 µ capacitor must be installed in the supply line of an unregulated power supply. Min. supply voltage in V V eff (2) (6) (8) () Length of supply cable in ft (m) 8 AWG.75 mm 2 mm 2 6 AWG l 5/

6 RA 29 58/6.98 Performance curves: measured at ν = 9 SUS (4 mm 2 /s) and t = 44 (5 C) Pressure in port P or P2 in dependence on signal value Q =.32 GPM (5 L/min) (6) (5) (3) (2) () Pressure range 725 PSI (5 bar) (external and internal) (2) () (8) (6) (2) Pressure range 45 PSI ( bar) (external and internal) (24) (2) (6) (2) (8) Pressure range 29 PSI (2 bar) (external and internal) (35) (3) (25) (2) (5) () (5) Pressure range 46 PSI (35 bar) (external and internal) Pressure in port P or P2 dependent on flow (6) Pressure range 725 PSI (5 bar) 8 (5) 6 (3) 4 (2) () (25) Pressure range 45 PSI ( bar) () 5 (75) (5) (25) () (5) These curves were measured without any back pressure at port A (externally drained) and T (internally drained). With internal drain the pressure setting at P or P2 rises in relation to the output pressure at port T. 6/ (25) (2) (5) () (5) Pressure range 29 PSI (2 bar) (35) (3) (25) (2) (5) Pressure range 46 PSI (35 bar)

7 RA 29 58/6.98 Operating curves: measured at ν = 9 SUS (4 mm 2 /s) and t = 22 (5 C) Minimum set pressure in port P or P2 at signal value Pilot drain internal external Pressure range 725 PSI (5 bar) (6) 8 (5) 6 (3) 4 (2) 2 () (4) Pressure range 45 PSI ( bar) 2 (2) 6 () (8) 2 (6) low in GPM (L/min) (4) (2) () (8) (6) Pressure range 29 PSI (2 bar) (4) Pressure range 46 PSI (35 bar) 2 (2) 6 () (8) 2 (6) low in GPM (L/min) The operating curves were measured without counter-pressure in port A (externally drained) and T (internally drained). With internal drain the pressure in P or P2 is increased by the output pressure at port T. Pressure drop in PSI (bar) low in GPM (L/min) (5) (3) (2) () (5) (3) (2) () low in GPM (L/min) low in GPM (L/min) Pressure drop through valve body (flow related) A A 2 and B B 2 Pressure drop in PSI (bar) (5) (3) (2) () Pressure drop through valve body (flow related) T T 2 low in GPM (L/min) Pressure drop through valve body (flow related) P P low in GPM (L/min) 7/

8 RA 29 58/6.98 Unit dimensions, Model DBE and DBEE: dimensions in inches (millimeters).94±.4 (27.8±.).748±.4 (9±.) 7.22±.4 (3±.).46±.4 (.3±.) 8 T A P B.64±.4 (6.25±.).45±.4 (26.55±.).279±.4 (32.5±.).772 (45).3 (.75).66 (5.4).594±.4 (4.5±.).234 (5.95).66 (with integrated controls) (27) 8.93 (with manual override) (226.9) 8.7 (24.9) 3.7 (99.4) Ø.22 (5.5) Ø.39 ().768 (9.5) 2.6 (5) (42).97 (5) 3.43 (87) 3 Ø ( ) (.3 +. ) Proportional solenoid 2 Nameplate 3 Valve body 4 R-Rings 9.8 mm x.5 mm x.78 mm 5 Model with manual override N 6 Space required to remove plug 7 Externally drained via port A (Model Y).4/4. in./ mm 32 (R max 4) Required surface finish of interface when mounting the valve without our subplate 8 Subplates Porting pattern to ISO NPA T3.5.M R R 3 ANSI B 93.7 R3 Subplates G 34/5 (/4" NPT), G 34/2 (SAE-4; 7/6-2), G 342/5 (3/8" NPT), G 342/2 (SAE-6; 9/6-8) Valve mounting bolts 4) -24 UNC x 2" (M5 x 5 mm) socket head cap screw or better) Tightening torque 5.2 lb-ft (7 Nm) Subplate and valve mounting bolts must be ordered separately, see RA Integral electronic controls with plug RR ) Note: Accidental release of the emergency hand operator may lead to uncontrolled machine movements. 8/

9 Unit dimensions, Model ZDBE and ZDBEE: dimensions in inches (millimeters) RA 29 58/ ±.4 (45) (26.55±.).64±.4 (6.25±.) 8.23 (5.95).22±.4 (3±.).3 (.75).94±.4 (27.8±.).748±.4 (9±.).46±.4 (.3±.) A T P.43 () B.594±.4 (4.5±.).279±.4 (32.5±.) 2 "2" "4" 2.44 (62) 2.44 (62).6 (5).768 (9.5) 3.9 (99.4) 8.93 (226.9) 8.7 (24.9).66 (27) (with integral electronics) (with manual override) Ø.22 (5.5) "" 3.43 (87) (.3 +. ) (5) A P T B 7 5 A2 P2 T2 B2 3 Ø ( ) 4 "3" "" to "4" Position of solenoid plug or housing with electronic controls (see order codes) Proportional solenoid note: on sandwich design, the position of the angled plug-in connector is optional, see ordering code 2 Nameplate 3 Valve body 4 R-Ring 9.8 mm x.5 mm x.78 mm 5 Model with manual override N 6 Space required to remove plug RR Integral electronics with plug 8 Through holes for valve mounting bolts -24 UNC (M5) ) Note: Accidental release of the emergency hand operator may lead to uncontrolled machine movements. 32.4/4. in./ mm (R max 4) Required surface finish of interface when mounting the valve without our subplate 9/

10 / All rights reserved Subject to revision Printed in U.S.A. Mannesmann Rexroth Corporation Rexroth Hydraulics Div., Industrial, 235 City Line Road, Bethlehem, PA Tel. (6) ax: (6) Rexroth Hydraulics Div., Mobile, 7 Old Mansfield Road, Wooster, OH Tel. (33) ax: (33) "Up" ramp O "Down" ramp O Differential input Command value 2 Reference potential/gnd Command value Operating voltage + 9 V M 9 V + 24 V V ( ) 2a 2c 4ac 28c 3ac 2ac 6ac 8ac ac 4ac 6ac 24ac 8ac Differential input 2; 5 Summation 3 Max. command potentiometer 4 Ramp generator See RA 3 for more information. Measurement zero (M) is raised by 9 V compared to V operating voltage! BR...BR3 V(i) V 2.5 A MT + 2 x 22 µ 2 2 Σ = 3 = Gw 6 Char. curve generator 7 Char. curve generator 2 8 PI current controller 9 Current amplifier Pulse generator t BR4 4 t I V I V2 7 BR2 BR22 32ac 6 BR5 BR23 BR6 BR24 R3 4ac 4 3 H2 =on the front plate Valve with proportional solenoid 2 Command value monitoring 3 Monitors 4 Power supply Σ 5 Gw t Hz, 2 Hz 3 Hz, 37 Hz BR25...BR27 PI 8 2ac 26a 26c 8ac " w " 9 22ac V i BR7 M " I " = Command value potentiometer = Time setting "up" ramp Current command value to "w" to +6 V Actual current value to "I" mv = ma "Ready for operation" t = Time setting "down" ramp I V = Biasing current stage (5/ ma) I V2 = Biasing current stage 2 (/2 ma) R3 = Additional biasing current adjustment ( to 3 ma or to 6 ma) Block circuit diagram / pin allocation: VT-VSPA--X RA 29 58/6.98