RE 29 739/07.03 Replaces: 10.95 Electric amplifier modules for the closed loop control of proportional directional valves with electric positional feedback Types VT 11023, VT 11024, VT 11074 and VT 11075, Series 1X Series 1X Type VT 11 023 (from series 15) Overview of contents Features Description Page The amplifier modules VT 11 023, VT 11 024, VT 11 074 and VT 11 075 are used for the closed loop control of direct operated propor- Features, Functional description, Ordering code 1 tional directional valves with electric positional feedback (type 4WRE: Technical Data, Response in case of error 2 sizes 6 and 10). Block circuit diagram, Terminal connection 3 – Differential input Additional information, Unit dimensions 4 – Adjustable ramp generator (max ramp time 5 s) – Step function generator (only with VT 11 023 and VT 11 024) Functional description –Two pulsed current output stages The amplifier module is clipped onto carrier rails such as those – Controller for the valve spool position commonly installed in electronic control cabinets. The electric –Polarity safeguard for the voltage supply connection is via a terminal strip. – Oscillator and demodulator for the inductive positioning The amplifier module contains the electronic components for the signalling control of two proportional solenoids. Depending on the command value polarity solenoid "a" or "b" is controlled. The actual value – Controller release (position of valve spool) is signalled by an inductive transducer – Cable break recognition measuring system and compared to the externally signalled command – LED-displays: "power" – internal supply voltage (green) value. Occurring differences between actual and command value are "H1" – multifunction indicator (orange) levelled out.Through the connection of a positive voltage (U > 8,5 V) F at terminal 3 the controller and the output stage are released. The following may be set via an external trimming potentiometer: – the ramp time up to ca. 5 s – a command value reduction in the range from 0 % to 100 % – the zero point of the position transducer Ordering code Amplifier module VT 11 0_ _ –1X/ * for proportional directional valves type 4WRE6 = 23 Further details in clear text for proportional directional valves type 4WRE10 = 24 1) 1) for proportional directional valves type 4WRE6 = 74 1X = Series 15 to 19 1) for proportional directional valves type 4WRE10 = 75 (15 to 19: unchanged technical data and terminal connection) 1) with V spool 2) Compatible with units of series 10 to 14, when terminal 6 was not connected to ground (0V) in these units (see project instructions page 4). © 2003 by Bosch Rexroth AG, Industrial Hydraulics, D-97813 Lohr am Main All rights reserved. No part of this document may be reproduced or stored, processed, duplicated or circulated using electronic systems, in any form or by any means, without the prior written authorisation of Bosch Rexroth AG. In the event of contravention of the above provisions, the contravening party is obliged to pay compensation. VT 11023, VT 11024, VT 11074, VT 11075 1/4 RE 29 739/07.03 H/A 5310/95 Technical data (For applications outside these stated values, please consult us!) Operating voltage U + 24 VDC + 40 % –10 % B Function range: – upper limit value u (t) + 35 V B max – lower limit value u (t) + 21 V B min Max. current consumption I 2 A Fuse I 3 A; sluggish; after release self-activating Inputs: 1) – Differential input (command value input) U 0 to ± 10 V; R = 50 kΩ (standard) e e – Release • active U 8,5 V < U < 40 V F F • inactive U < 6,5 V F – Demodulator input (positional measuring system) R > 50 kΩ e Ramp time (setting range) t 10 ms to 5 s Outputs: – Output stage • Solenoid current/resistance VT 11023 I 1,8 A; R = 5,4 Ω max (20) VT 11024 I 2,2 A; R = 10 Ω max (20) VT 11074 I 1,8 A; R = 5,4 Ω max (20) VT 11075 I 2,2 A; R = 10 Ω max (20) • Pulse frequency f freely pulsating up to ca. 1,5 kHz – Driver for the inductive transducer • Oscillator frequency f 5,8 kHz ± 10 % • Max. capacity I 30 mA • Voltage amplitude (U ) U 5V per output SS a • Max. stroke of transducer VT 11023 s 2,8 mm VT 11024 s 4,0 mm VT 11074 s 2,8 mm VT 11075 s 4,0 mm – Test points • Command value wU 0 to ± 5V w • Actual position value xU 0 to ± 5V x Type of connection 12-pin terminal strip Housing dimensions (W x H x D) 40 x 79 x 85,5 mm 2) Permissible temperature range t 0 to 50 °C to DIN/IEC 68-2, T1, T2, T14 and T30 2) Storage temperature range t – 25 to + 85 °C to DIN/IEC 68-2, T1 and T2 2) Disturbance resistance Class 3 to prEN 50082 T2 2) Mechanical loadability to DIN/IEC 68-2, T6, T24 and T27 Weight m 0,14 kg 1) Current input on request 2) Further details on request Response in case of error Error → Missing Cable break Asymmetry of Cable break 1) release (U < 6,5 V) transducer internal supply voltage current input F Response of Electronics → E, R, AE, R, AE, R, AS, A 1) only in special versions with current input 4 to 20 mA (on request) Meaning of abbreviations: E = Output stage is switched off (solenoids are moved into currentless state) R = Controller is switched off S = Command value is set to 0% A = Multifunction display is illuminated RE 29 739/07.03 2/4 VT 11023, VT 11024, VT 11074, VT 11075 Block circuit diagram/ VT 11023, VT 11024, VT 11074 and VT 11075 (from series 15) only in special versions with current input 4 to 20 mA (on request) 5 6 3 7 Release + U F u b PI 8 i H1 10 11 Differential input 4 5 6 u(i) Reference potential 9 5 a u u PI 0 V to + 10 V → b 2 10 i 8 0 V to – 10 V → a 3 4 1 Gw 2 1 PI Σ 4 3 t Gx 11 1 + UM + U DC + B M0 Operating voltage 2 Zx DC 12 – UM 1 0 V 12 ≈ = 9 power 6 2 7 1 1 Ramp generator 6 Output stage Actual value 0 to ± 5 V H1 Multifunction display 2 Zx Zero point position transducer 2 Step function generator 7 Oscillator/Demodulator Command value 0 to ± 5 V (only with VT 11 023 and 3 Gw Command value reduction 8 Differential amplifier Measuring zero VT 11 024) 4 9 Power supply Gx Actual value adjustment Measuring zero 3 Summator 10 Monitoring t Ramp time 4 Controller for spool position 11 Proportional valve 5 Current controller 12 Position transducer Positive command value causes current increase in solenoid "b" and flow from P to A and from B to T. Negative command value causes current increase in solenoid "a" and flow from P to B and from A to T. Terminal connection   1 7 + U B Connection Operating   0 V solenoid "b" voltage 2 8   3 9  Release U F Connection  Reference solenoid "a" 4 10   Differential potential  input 5 11   ±U Com Position transducer  Position transducer connection 6 12  2 1 connection Connection cable (recommendation): – Position transducer → 3-strand cable, single screened, 2 cross section max. 1,5 mm – Solenoid connection → 2 or 4-strand cable, single screened, 2 cross section max. 1,5 mm – Differential input → 2-strand, single screened VT 11023, VT 11024, VT 11074, VT 11075 3/4 RE 29 739/07.03 Project / Maintenance instructions / Additional information –The amplifier module may only be connected when switched off! – Do not connect earth terminal of inductive transducer to ground! – Do not connect terminal 6 to ground, earth or screen; otherwise function disturbance may occur! (This was also not allowed with units of series 10 to 14, but did not lead to function disturbances.) – Always screen command value lines and lines of the inductive transducer separately, screen open at valve; connect screen to 0 V operating voltage (terminal 2) on module side only, in order to avoid coupling! – Do not lay lines near power cables! – Do not use free wheel diodes in the solenoid lines! –The distance to arial lines, radio sources and radar equipment must be at least 1 m! – Because of the load current of the integrated smoothing capacitor external fuses must have slow characteristics! – Warning: • When using the differential input (command value as voltage signal) both inputs must always be switched on or off simultaneously! • When assembling this module amplifier a minimum distance of 2 cm on both sides must be guaranteed! •The actual value adjustment (potentiometer "Gx") is calibrated by the factory and must not be altered! Unit dimensions (Dimensions in mm) Carrier rail NS 35/7,5 to DIN 50 022 78 9 10 11 12 H1: Multifunction indicator (see page 2) REXROTH power: Internal supply voltage VT 11023-1X Gw Gw: Command value reduction power t t: Ramp time Gx H1 Gx: Actual value adjustment Zx Zx: Zero point position transducer 1 2 Test point 1: Actual value 0 to ± 5V 3 4 Test point 2: Command value 0 to ± 5V 1 2 3 4 5 6 Test point 3: Measuring zero 85,5 40 Test point 4: Measuring zero Bosch Rexroth AG The data specified above only serves to describe Industrial Hydraulics the product. No statements concerning a certain condition or suitability for a certain application D-97813 Lohr am Main can be derived from our information.The details Zum Eisengießer 1 • D-97816 Lohr am Main stated do not release you from the responsibility Telefon 0 93 52 / 18-0 for carrying out your own assessment and Telefax 0 93 52 / 18-23 58 • Telex 6 89 418-0 verification. It must be remembered that our eMail documentation@boschrexroth.de products are subject to a natural process of Internet www.boschrexroth.de wear and ageing. RE 29 739/07.03 4/4 VT 11023, VT 11024, VT 11074, VT 11075 79