Proportional pressure relief valve Type DBETRE

Transcription

1 RE 9 68/.99 Proportional pressure relief valve Type DBETRE Nominal size 6 Series X Max. operating pressure 5 bar Max. flow up to L/min H/A/D 67/99 Type DBETRE-X/ G4KA with integrated control electronics Overview of contents Contents Page Features Ordering details Preferred types Symbols Function, section Technical data 4 Electrical connections, plug-in connector 5 Control electronics 6 Characteristic curves 7 and 8 Unit dimensions 9 Features Direct actuated valve for limiting a system pressure Actuation via a proportional solenoid with position transducer For subplates: Porting pattern to DIN 4 4 form A6 and ISO 44 For subplates see catalogue sheet RE 45 5, (separate order, see page 9) Integrated control electronics Low command value - pressure - characteristic curve - example spread Low hysteresis Good repeatability accuracy DBETRE /

2 Ordering details DBETRE X / G4 K A * Proportional pressure relief valve with integrated electronics Series to 9 = X ( to 9: unchanged installation and connection dimensions) Pressure stage Up to bar = Up to 8 bar = 8 Up to 8 bar = 8 Up to 5 bar = 5 Up to 5 bar = 5 Up to 5 bar = 5 G4 = Further details in clear text M = NBR seals, suitable for mineral oil (HL, HLP) to DIN 5 54 V = FKM seals Interface for the control electronics A = Command value input to VDC Electrical connections K = With component plug to E DIN 456-AM6-4 without plug-in connector Plug-in connector separate order see page 5 Control electronics supply voltage 4 V DC Preferred types Material no. Type DBETRE-X/8G4KAM DBETRE-X/8G4KAM DBETRE-X/5G4KAM DBETRE-X/5G4KAM Symbol P T G Rexroth Hydraulics / DBETRE

3 Function, section The DBETRE proportional pressure relief valves are remote control valves, of a seat type design and are used to limit a system pressure. With these valves it is possible to steplessly control the system pressure in relation to the command value being applied to the integrated control electronics: Technical design: The valve comprises of the following main components: Housing () Proportional solenoid (7) with position transducer (8) and integrated control electronics () Valve seat () Valve poppet (4) Compression spring (6) Functional description: The pressure setting is achieved via the command value being applied at the component plug (5). The command value input influences, via the integrated control electronics, the position of the proportional solenoid (7) armature and therefore the pretension of the compression spring (6). The compression spring (6) presses the valve poppet (4) against the valve seat (). The system pressure being applied in port P acts on the valve poppet (4) and and therefore against the force of the compression spring (6) / the proportional solenoid (). If the hydraulic force acting on the valve poppet (4) is the same as the spring force, then the valve controls the set pressure in that the valve poppet (4) lifts off the valve seat () and permits pressure fluid to flow from P to T. Any position deviations of the solenoid armature from the command value are corrected by the closed loop position control. Solenoid friction is eliminated by the closed loop position control Advantages are the low hysteresis and good repeatability accuracy. With a zero command value and if the power supply fails, the valves sets itself to the lowest settable pressure. For information regarding the integrated control electronics, see page 6. Sensitivity Zero point 5 A 4 8 Bled screw is located on the other side 7 6 P T DBETRE / Rexroth Hydraulics

4 Technical data (for applications outside these parameters, please consult us!) General Installation Ambient temperature range C to +5 Storage temperature range C to +8 Weight kg.4 Hydraulic (measured at ν = 4 mm /s and ϑ = 5 C) preferably with the proportional solenoid horizontal or pointing downwards Operating pressure, max. perm. Port P bar 8 Max. settable pressure Pressure stage bar Pressure stage 8 bar The maximum settable pressure is dependent on the flow. Pressure stage 8 bar (see characteristic curves settable pressure in bar / command Pressure stage 5 bar value voltage in %, see pages 7 and 8) Pressure stage 5 bar Pressure stage 5 bar Min. settable pressure with a zero command value bar see characteristic curves on pages 7 and 8 Return pressure (port T) separate and at zero pressure to tank Flow Pressure stage bar L/min Pressure stage 8 bar L/min.5 Pressure stage 8 bar L/min.5 Pressure stage 5 bar L/min.5 Pressure stage 5 bar L/min Pressure stage 5 bar L/min Pressure fluid mineral oil (HL, HLP) to DIN 5 54 further pressure fluids on request! Pressure fluid temperature range C to +7 Viscostiy range mm /s 5 to 8 Degree of contamination Maximum permissible A filter is recommended degree of the pressure fluid with a minimum retention contamination is to NAS 68 rate of β x 75 Hysteresis % of the max. settable pressure Reverse error %. of the max. settable pressure class 9 x = Response sensitivity %. of the max. settable pressure Command value - pressure - characteristic curve % ±.5 of the max. settable pressure example spread in relation to the hysteresis characteristic curve, with pressure increasing, flow.5 L/min Step response (T u + T g ) % or % ms to (dependent on the system) Electrical Supply voltage 4 V DC Command value input to VDC Electrical connections with component plug to E DIN 4 56-AM6- plug-in connector to E DIN 4 56-BF6-/Pg (separate order, see page 5) Valve protection to DIN 4 5 IP 65 Control electronics integrated in the valve, see page 6 Note: For details regarding the environmental simulation test covering EMC (electro-magnetic compatibility), climate and mechanical loading see RE 9 68-U (declaration regarding environmental compatibility). Rexroth Hydraulics 4/ DBETRE

5 Electrical connections, plug-in connector Plug-in connector Plug-in connector to E DIN 4 56-BF6-/Pg separate order under material no. 67 (plastic version) 9 Ø6,5 Plug-in connector Plug-in connector to E DIN 4 56-BF6-/Pg.5 separate order under material no. 89 (metal version) F E D A B C Ø8 7 Component plug contact allocation Contact Signal Supply voltage A 4 VDC (u(t) = 9.4 V to 5 V); I Nom =.8 A; I max =.5 A B V Actual value ref. potential C V ref. contact F; R e > 5 kω Differential amplifier input D to V command value; R e >5kΩ command value E V ref. potentional; R e >5kΩ Measurement output (act. val.) F to V actual value (limiting load ma) PE connected with cooling body and valve housing Actual value: Interface: A positive signal at F and the ref. potential at C results in an increase in pressure. Connect pin C on the control side (star form) with. Command value: A positive command value at D and the ref. potential at E results in an increase in pressure Connection cable: Recommendation: up to 5 m cable length, type LiYCY 7 x.75 mm up to 5 m cable length, type LiYCY 7 x. mm Outside diameter 6.5 to mm (plastic plug-in connector) Outside diameter 8 to mm (metal plug-in connector) Only connect the screen on the supply side to. DBETRE 5/ Rexroth Hydraulics

6 Integrated control electronics Block circuit diagram / integrated control electronics connection allocation Interface Integrated control electronics Valve Command value Ref. potential D E Differential amplifier U I ) P Act. val. output Controller Act.val. T G Actual value Ref. potential ) Supply voltage Earth ) 4V V F C A B PE U U Under voltage recognition +Ui V Ui Sensitivity Interlock Logic Oscillator = Demodulator = Zero point Position transducer Note: Electrical signals (e.g. actual value) taken via valve electronics must not be used to switch off the machine safety functions! (This is in accordance with the regulations to the European Standard "Safety requirements of fluid technology systems and components hydraulics, EN 98!) ) Connection PE is connected to the cooling body and valve housing ) Conntect pin C on the control side with ) Current controlled output stage Rexroth Hydraulics 6/ DBETRE

7 Characteristic curves (measured at ν = 4 mm /s and ϑ = 5 C) Pressure in port P in relation to the command value Pressure stage bar Minimum settable pressure in P at a zero command value Pressure stage bar Curve flow =.5 L/min Curve flow = L/min 5, 4,,,, 4 6 8,5,,5,,5, Pressure stage 8 bar Curve flow =.5 L/min Curve flow =.5 L/min Pressure stage 8 bar, 9, 8, 7, 6, 5, 4,,,,,5,,5,,5 Pressure stage 8 bar Curve flow =.5 L/min Curve flow =.5 L/min Pressure stage 8 bar, 9, 8, 7, 6. 5, 4,,,, 4 6 8,5,,5,,5 DBETRE 7/ Rexroth Hydraulics

8 Characteristic curves (measured at ν = 4 mm /s and ϑ = 5 C) Pressure in port P in relation to the command value Pressure stage 5 bar Curve flow =.5 L/min Curve flow =.5 L/min Minimum settable pressure in P at a zero command value Pressure stage 5 bar ,5,,5,,5 Pressure stage 5 bar Curve flow =.5 L/min Curve flow = L/min Pressure stage 5 bar ,5,,5, Pressure stage 5 bar Pressure stage 5 bar Curve flow =.5 L/min Curve flow =. L/min ,5,,5, Rexroth Hydraulics 8/ DBETRE

9 Unit dimensions (Dimensions in mm) R ,5 94,5 9 97,5 75 6, ,5 4,5 T P,75, ,5 T P,75,75 Subplates to catalogue sheet RE 45 5 and valve fixing screws have to be separately ordered. Subplates: G 4/ (G/4) G 4/ (G/8) G 5/ (G/) Valve fixing screws: M5 x DIN 9-.9; M A = 8.9 Nm Valve housing Proportional solenoid with position transducer Plug-in connector to E DIN 4 56-BF6-/Pg plastic version), separate order, see page 5 4 Space required to remove the plug-in connector 5 Space required for the cable bend radius when removing the plug-in connector,/mm R 4 max Required surface finish of mating piece 6 Cable bend radius 7 Integrated control electronics with component plug 8 Name plate 9 R-rings 9.8 x.5 x.78 Blind hole Machined valve mounting surface, port locations to DIN 4 4 form A6; ISO 44 Lable containing the pin allocations for positions and 7 Bleed screw DBETRE 9/ Rexroth Hydraulics

10 Notes Mannesmann Rexroth AG Rexroth Hydraulics D-978 Lohr am Main Jahnstraße -5 D-9786 Lohr am Main Telefon 9 5 / 8- Telefax 9 5 / 8-58 Telex product.support@rexroth.de Internet Mannesmann Rexroth Limited Cromwell Road, St Neots, Cambs, PE9 ES Tel: 4 8/ 56 Fax: 4 8/ info@rexroth.co.uk The specified data is for product description purposes only and may not be deemed to be guaranteed unless expressly confirmed in the contract. All rights reserved Subject to revision / DBETRE