Analogue amplifier modules for 4/3 and 4/2 proportional directional valves 4WRE

Transcription

1 Analoge amplifier modles for 4/3 and 4/ proportional directional valves 4WRE RE 309/06.05 Replaces:.04 /0 Types VT-MRPA and VT-MRPA Component series X H677 Table of contents Contents Page Featres Ordering code Fnctional description 3 Block circit diagram / pin assignment VT-MRPA 4 Block circit diagram / pin assignment VT-MRPA 5 Technical data 6 Terminal assignment 7 Unit dimensions 7 Engineering / maintenance notes / spplementary information 8 Adjstment recommendations 9 Featres Sitable for controlling direct operated 4/3 and 4/ proportional directional valves with electrical position feedback, type 4WRE, sizes 6 and 0, component series X Command vale inpt ±0 V (VT-MRPA), 0 to 0 V (VT-MRPA) Ramp generator with separately adjstable p/down ramp times Characteristic crve correction with symmetrically (with VT-MRPA only) adjstable step-change heights and separately (with VT-MRPA only) adjstable maximm vales Enable inpt Reverse polarity protection of power spply Power spply nit with DC/DC converter withot raised zero point Cable break detection in the position transdcer branch LED indicator lamps: Readiness for operation (green) Enable (yellow)

2 /0 Bosch Rexroth AG Hydralics VT-MRPA, VT-MRPA RE 309/06.05 Ordering code VT-MRPA X V0 * Analoge amplifier of modlar design For 4/ proportional directional valves 4WRE (with one solenoid) = For 4/3 proportional directional valves 4WRE (with two solenoids) = For controlling valve 4WRE 6 (component series X) = For controlling valve 4WRE 0 (component series X) = Component series 0 to 9 = X (0 to 9: nchanged technical data and pin assignment) V0 = Frther details in clear text Basic version Sitable power spply nit: Type VT-NE30-X, see RE 999 compact power spply nit 5/30 VAC > 4 VDC, 08 VA

3 RE 309/06.05 VT-MRPA, VT-MRPA Hydralics Bosch Rexroth AG 3/0 Fnctional description General The amplifier modles are to be snapped onto top hat rails according to EN The electrical connection is made by means of screw terminals. The modles are operated at 4V DC. Power spply nit [] The amplifier modles are provided with a power spply nit with switch-on crrent limiter. The power spply nit provides all internally reqired positive and negative spply voltages. The switch-on crrent limiter prevents high switch-on crrent peaks. Command vale feedforward The internal command vale signal is generated from the sm [3] of the external command vale signal applied to differential inpt [] and the zero point offset (zero point potentiometer Zw ). The following is valid for VT-MRPA: A positive command vale cases an increase in crrent in solenoid b and hence a flow in the valve from P to A and from B to T. A negative command vale cases an increase in crrent in solenoid a and hence a flow in the valve from P to B and from A to T. The following is valid for VT-MRPA: A positive command vale cases an increase in crrent in the solenoid. Enable fnction [] The enable fnction is sed to enable the crrent otpt stages and to pass the internal command vale signal on to the ramp generator. The enable signal is indicated by an LED on the front panel. When the enable is granted, the internal command vale changes over the set ramp time (with any command vale selection). The valve does therefore not open sddenly when activated. Characteristic crve generator [5] The adjstable characteristic crve generator can be sed to adjst step-change heights symmetrically (with VT-MRPA only) and maximm vales for positive and negative signals separately (with VT-MRPA only) to sit the hydralic reqirements. The actal line of the characteristic crve throgh the zero point is not stepped, bt linear. Amplitde limiter [6] The internal command vale is limited to approx. ±0 % (with VT-MRPA) or +0 % (with VT-MRPA) of the nominal range. Oscillator [9] The oscillator generates the control signal for the indctive position transdcer. Demodlator [0] The demodlator generates the actal vale signal of the valve spool position from the position transdcer signal: ±00 % ±0 V (with VT-MRPA) or +00 % +0 V (with VT-MRPA), respectively Controller for valve spool position [7] The position controller is optimised specifically to the valve. Crrent otpt stage [8] The crrent otpt stage generates the clocked solenoid crrent for the proportional valve. The solenoid crrent is limited to.4 A to.6 A per otpt. The otpt stage otpts are shortcircit-proof. In the event of an internal falt signal or missing enable, the otpt stages are de-energised. Falt detection [4] The position transdcer cable is monitored for cable break and primary-sided short-circit, and the otpt stage for overcrrent. [ ] = Cross-reference to block circit diagrams on pages 4 and 5 Ramp generator [4] The ramp generator limits the gradient of the control otpt. The downstream step fnctions and amplitde attenators do not shorten or extend the ramp time. Note on the adjstment and measrement of the ramp time: Vale at measring socket "t <" or "t >" U t in V 5 3 Crrent ramp time (± 0 %) t in ms U t in V t in ms The following is valid: t = 00 V ms U t Example: Measred U t = 5 V reslts in t = 00 V ms = 0 ms 5 V

4 4/0 Bosch Rexroth AG Hydralics VT-MRPA, VT-MRPA RE 309/06.05 Block circit diagram / pin assignment VT-MRPA A positive command vale cases an increase in crrent in solenoid b and hence a flow in the valve from P to A and from B to T. A negative command vale cases an increase in crrent in solenoid a and hence a flow in the valve from P to B and from A to T. Differential inpt (U comm ): Command vale: ±0 V Reference potential/gnd Σ t < t < wr Sw w t max M0 Zw t > t > Gw + Gw Enable 3 & PID 7 4 U B x Operating voltage + U B 0 V L0 DC DC + 5 V + 0 V M0 0 V 5 V Gx Zw = Command vale zero point Zx = Actal vale zero point t < = Ram p time p t > = Ramp time down Sw = Step-change height Gw = Amplitde attenator Gx = Actal vale sensitivity w = Command vale x = Actal vale wr = Command vale after ramp = Readiness for operation = Enable Power spply nit Differential amplifier 3 Command vale smmator 4 Ramp generator 5 Characteristic crve generator 6 Amplitde limiter 7 Controller for valve spool position 8 8 U B U B i i Solenoid b Solenoid a = = 3 Zx 8 Crrent otpt stage 9 Oscillator 0 Demodlator Enable fnction Proportional valve 3 Indctive position transdcer 4 Falt detection

5 RE 309/06.05 VT-MRPA, VT-MRPA Hydralics Bosch Rexroth AG 5/0 Block circit diagram / pin assignment VT-MRPA A positiver command vale cases an increase in crrent in the solenoid Differential inpt (U comm ): Cåommand vale: 0 +0 V Reference potential/gnd Σ t < t < wr 5 4 Zw t > t > Gw Enable 3 & 4 U B Operating voltage + U B 0 V L0 DC DC + 5 V + 0 V M0 0 V 5 V Zw = Command vale zero point Zx = Actal vale zero point t < = Ram p time p t > = Ramp time down Sw = Step-change height Gw = Amplitde attenator Gx = Actal vale sensitivity w = Command vale x = Actal vale wr = Command vale after ramp = Readiness for operation = Enable Sw w 6 M0 t max PID 7 x Gx Power spply nit Differential amplifier 3 Command vale smmator 4 Ramp generator 5 Characteristic crve generator 6 Amplitde limiter 7 Controller for valve spool position 9 0 n.c. n.c. U B 8 i 7 8 = = 3 Zx 8 Crrent otpt stage 9 Oscillator 0 Demodlator Enable fnction Proportional valve 3 Indctive position transdcer 4 Falt detection

6 6/0 Bosch Rexroth AG Hydralics VT-MRPA, VT-MRPA RE 309/06.05 Technical data (for applications otside these parameters, please conslt s!) Operating voltage U O 4 VDC + 40 % 0 % Operating range: Upper limit vale O (t) max 35 V Lower limit vale O (t) min 8 V Power consmption P S < 4 VA Crrent consmption I < A Fse protection Thermal overload protection (reclosing when the temperatre falls below the threshold) Inpts: Analoge Command vale (differential inpt) VT-MRPA VT-MRPA Digital U i U i 0 to ±0 V, R i > 50 kω (crrent inpt on enqiry) 0 to +0 V, R i > 50 kω (crrent inpt on enqiry) Enable ON U 8.5 V to U O, R i > 00 kω OFF U 0 to 6.5 V, R i > 00 kω Adjstment ranges: Command vale zero point (potentiometer Zw ) ±30 % Actal vale zero point (potentiometer Zx ) ±0 % Ramp times (potentiometers t < and t > ) 0 ms to 5 s Step-change height (potentiometer Sw ) 0 % to 50 % Amplitde attenator (potentiometers G+ and G ) 0 % to 0 % (valid for a step-change height setting of 0 %) Otpts: Crrent otpts I 0 to.5 A; short-circit-proof; clocked, approx. 5 khz Oscillator U SS 0 V; 0 ma f 5.6 khz ± 0 % Measring sockets Ramp time t < U 0 mv to 5 V Ramp time t > U 0 mv to 5 V Actal vale x Command vale w VT-MRPA VT-MRPA VT-MRPA VT-MRPA Command vale after ramp wr VT-MRPA VT-MRPA Type of connection U U U U U U 0 to ±0 V 0 to +0 V 0 to ±0 V 0 to +0 V 0 to ±0 V 0 to 0 V screw terminals Type of monting Top hat rail TH to EN 6075 Type of protection IP 0 to EN 6059 Dimensions (W x H x D) 40 x 79 x 85.5 mm Permissible operating temperatre range ϑ 0 to +50 C Storage temperatre range ϑ 5 to +70 C Weight m 0.4 kg Note! Details with regard to environment simlation testing in the fields of EMC (electro ma gne ti c compatibility), climate and mecha ni cal stress, see RE 309-U (declaration on environmental compatibility).

7 RE 309/06.05 VT-MRPA, VT-MRPA Hydralics Bosch Rexroth AG 7/0 Terminal assignment VT-MRPA VT-MRPA Operating voltage +U O 7 0 V ) 8 Solenoid b Solenoid Enable U E 3 9 Differential inpt Position transdcer, primary Reference potential 4 0 Solenoid a ±U comm 5 4 Position transdcer, secondary n.c. 4 Position transdcer, secondary ) and position transdcer, primary (connection ) Unit dimensions (nominal dimensions in mm) Top hat rail TH to EN 6075 LED indicator lamps: Readiness for operation (green) 79 85, REXROTH Gw+ VT-MRPAx -x Gw Sw Zw Zx t < t > t < t > x w wr Enable (yellow) Potentiometers: Gw+ Amplitde attenator for positive command vales Gw Amplitde attenator for negative command vales (only with VT-MRPA) Sw Step-change height for negative and positive direction Zw Command vale zero point Zx Actal vale zero point t < Ramp time for rising command vales t > Ramp time for falling command vales Measring sockets: t < Ramp time p t > Ramp time down x Actal vale w Command vale wr Command vale after ramp Measring zero

8 8/0 Bosch Rexroth AG Hydralics VT-MRPA, VT-MRPA RE 309/06.05 Engineering / maintenance notes / spplementary information The amplifier modle may only be wired when disconnected from the power spply! Do not lay cables near power cables! Do not se free-wheeling diodes in solenoid cables! The distance to aerial lines, radio sorces and radar eqipment mst be at least m! Always shield command vale and position transdcer cables; connect the shield to the protective earth (PE) on the modle side! In individal cases (e.g. in the case of PE with severe interference) it may be reqired to connect the shield of the position transdcer cable directly to L0 of the amplifier modle; leave the other end open (risk of earth loops). Recommendation: Also shield solenoid cables! For solenoid cables p to 50 m length, se cable type LiYCY.5 mm! For greater lengths, please conslt s! For passing on command vales, se relays with gold-plated contacts (small voltages, small crrents)! Measrements on the modle may only be taken with instrments R i > 00 kω. To adjst the potentiometers, se a screw driver with a blade width of 4 mm! In the case of strongly flctating operating voltages, it may be reqired to install an external smoothing capacitor having a capacitance of at least 00 µf. Recommendation: Capacitor modle VT 073 (see RE 9750), sfficient for p to 3 amplifier modles

9 RE 309/06.05 VT-MRPA, VT-MRPA Hydralics Bosch Rexroth AG 9/0 Adjstment recommendation The system-specific circitry mst be completed. Signal Setting for VT-MRPA Setting for VT-MRPA Command vale zero point Actal vale zero point Set external command vale feedforward to zero Set the internal command vale to zero sing zero point potentiometer "Zw and check the setting at measring socket "wr" Set enable signal to OFF or disconnect solenoid plg-in connector (Valve moves to the mechanical centred position) Set the actal vale at measring socket x to zero sing potentiometer "Zx" Set external command vale feedforward to zero Set the internal command vale to zero sing zero point potentiometer "Zw and check the setting at measring socket "wr" Set enable signal to OFF or disconnect solenoid plg-in connector (Valve moves to end position) Set the actal vale at measring socket x to zero sing potentiometer "Zx" Ramp times Step-change height Maximm vales Recommendation: In the case of valves with V-spools, adjst the zero point dring operation with the hydralic drive, i.e. Apply enable signal and check at measring sockets "wr" and "w" Use potentiometer "Zx" to bring the hydralic drive to a standstill Set ramp time according to formla or table (see fnctional description Ramp generator ) and check at measring sockets "t >" and "t <" Apply enable signal Set the measring signal at wr to +0.3 V sing zero point potentiometer Zw Set the reqired step-change height sing po ten - tio me ter "Sw" Set the measring signal at wr to 0.3 V sing zero point potentiometer Zw Check the reqired step-change height, adjst zero point Note: In the case of an external command vale feedforward, at least +0.3 V / 0.3 V mst be measred at measring socket "wr". Note: Before the maximm vales are matched, the zero point and step-change heights mst have been correctly set. Adjst step-change heights first; generate ±00 % command vale externally Use potentiometers "Gw+"/"Gw " to adjst the reqired maximm control otpt and check the settings at measring sockets "wr" and "w" Recommendation: In the case of valves with V-spools, adjst the zero point dring operation with the hydralic drive, i.e. Apply enable signal and check at measring sockets "wr" and "w" Use potentiometer "Zx" to bring the hydralic drive to a standstill Set ramp time according to formla or table (see fnctional description Ramp generator ) and check at measring sockets "t >" and "t <" Apply enable signal Set the measring signal at wr to 0.3 V sing zero point potentiometer Zw Set the reqired step-change height sing po ten - tio me ter "Sw" Check the reqired step-change height, adjst zero point Note: In the case of an external command vale feedforward, at least 0.3 V mst be measred at measring socket "wr" Note: Before the maximm vales are matched, the zero point and step-change heights mst have been correctly set. Adjst step-change heights first; generate +00 % command vale externally Use potentiometer "Gw" to adjst the reqired maximm control otpt and check the settings at measring sockets "wr" and "w"

10 0/0 Bosch Rexroth AG Hydralics VT-MRPA, VT-MRPA RE 309/06.05 Notes Bosch Rexroth AG Hydralics Zm Eisengießer 9786 Lohr am Main, Germany Phone +49 (0) 93 5 / 8-0 Fax +49 (0) 93 5 / docmentation@boschrexroth.de This docment, as well as the data, specifications and other information set forth in it, are the exclsive property of Bosch Rexroth AG. It may not be reprodced or given to third parties withot its consent. The data specified above only serve to describe the prodct. No statements concerning a certain condition or sitability for a certain application can be derived from or information. The information given does not release the ser from the obligation of own jdgment and verification. It mst be remembered that or prodcts are sbject to a natral process of wear and aging.

11 RE 309/06.05 VT-MRPA, VT-MRPA Hydralics Bosch Rexroth AG /0 Notes Bosch Rexroth AG Hydralics Zm Eisengießer 9786 Lohr am Main, Germany Phone +49 (0) 93 5 / 8-0 Fax +49 (0) 93 5 / docmentation@boschrexroth.de This docment, as well as the data, specifications and other information set forth in it, are the exclsive property of Bosch Rexroth AG. It may not be reprodced or given to third parties withot its consent. The data specified above only serve to describe the prodct. No statements concerning a certain condition or sitability for a certain application can be derived from or information. The information given does not release the ser from the obligation of own jdgment and verification. It mst be remembered that or prodcts are sbject to a natral process of wear and aging.

12 /0 Bosch Rexroth AG Hydralics VT-MRPA, VT-MRPA RE 309/06.05 Notes Bosch Rexroth AG Hydralics Zm Eisengießer 9786 Lohr am Main, Germany Phone +49 (0) 93 5 / 8-0 Fax +49 (0) 93 5 / docmentation@boschrexroth.de This docment, as well as the data, specifications and other information set forth in it, are the exclsive property of Bosch Rexroth AG. It may not be reprodced or given to third parties withot its consent. The data specified above only serve to describe the prodct. No statements concerning a certain condition or sitability for a certain application can be derived from or information. The information given does not release the ser from the obligation of own jdgment and verification. It mst be remembered that or prodcts are sbject to a natral process of wear and aging.