Replaces: 09.12 Electro-hydraulic Control Digital Proportional Amplifier Type: RT-VSPA2-50 Series: 3X Table of contents Contents Page Features 1 Ordering code 2 Functional description 2 Block circuit diagram (RT-VSPA2-50/T1) 4 Block circuit diagram (RT-VSPA2-50/T5) 5 Technical data 6 Pin assignment 7 Output curve 7 Display / setting elements 8 Unit dimensions 9 Circuit examples 9 Project / maintenance instructions / additional information 11 Features Suitable for the control of proportional pressure valves (type 3DREP 6, from series 2X) and pilot operated proportional directional valves (type WRZ, from series 7X) without electrical position feedback Powerful 32-bit processor Four command values adjustable with potentiometers Four command values call-ups with LED display Differential input, switchable to current input Enable input with LED display Two pulsed current output stages Step function generator Ramp generator with one or five ramp times Fault detector with LED indicator Polarity protection for the voltage supply Power supply unit with DC/DC converter without elevated zero point Designed as a printed circuit board of Euro-card 100 x 160 mm and a front panel of 40 x 128.4 mm Card holder: Type RT-PAH-32D or RT-3002-2X/32D, single card holder without power supply, see RD13781 and RD13782 Any question, please don t hesitate to contact us! RT-VSPA2-50 1 / 12 www.rebotech.cn
Ordering code RT-VSPA2-50 / T - 30 - CN ReboTech Euro-card proportional amplifier CN = Further details in clear text Made in China Suitable for proportional valves type 3DREP 6 30 = Design number (from series 2X) and type WRZ (from series 7X) = 50 T1 = 1 Ramp time T5 = 5 Ramp times Functional description Power supply Rated operating voltage is 24 VDC, and its range is 19 ~ 35 VDC. Terminal a32 is the positive side of the power supply and a26 the negative. Power supply with the wrong level protection already contains filter capacitor, and therefore it does not need another external filter capacitor. Command value inputs With the command value inputs 1 to 4 command values can be called up [1] by operating the corresponding virtual relays (K1 to K4). The command value voltage is either given directly through the controlled voltages ± 9V of the power supply [9] or via an external command value potentiometer. For this inputs ± 9 V = ± 100 % is valid. If these four command value inputs are directly connected to the controlled voltages ± 9 V, four different command values can be set at the potentiometers "R1" to "R4". When using external command value potentiometers at these inputs, the internal potentiometers also function as weakeners or limiters when these are not set to maximum. External command value potentiometer Which command value is momentarily called up, is indicated by the LEDs "H1" to "H4". If more than one command value is called up simultaneously, the input with the highest number has priority. Example: If command value 1 and command value 3 are activated simultaneously, the command value 3 becomes effective. Additionally, the direct command value input 5 is available for the input voltage 0 to ± 6 V. Valid is ± 6 V = ± 100 %. The command value input 6 is a differential input (0 to ± 10 V). It can be designed (see "setting elements" page 7) as current input (4 to 20 ma or 0 to ± 20 ma) through the setting of DIP switches. If the command value is presented by a separate electronics with a different reference potential, this input must be used. When switching on or off the command value, take care that both signal lines are either connected to or disconnected from the input. A further output of the card provides a supply voltage for the command value call-ups which can be switched over from + 9 V to 9 V with the virtual relay K6. A positive command value signal (0 to 10 V, 0 to 20 ma or 12 ma to 20 ma) at the input of the amplifier controls the output stage for solenoid "b", a negative command value signal (0 to -10 V, 0 to -20 ma or 4 ma to 12 ma) the output stage for solenoid "a". Ramp times All command values are summated with the correct value and correct pre-sign during being passed on [3]. The subsequent ramp generator [4] generates from an applied step form input signal, a ramp shaped output www.rebotech.cn 2 / 12 RT-VSPA2-50
Functional description signal. The time constant of the output signal is adjustable via the potentiometers "t" (ordering code T1) or "t1" to "t5" (ordering code T5). The given ramp time refers to a command value jump of 100 % and can depend on the DIP switch setting (J5), be approx. 1 s or 5 s. If a command value jump less than 100 % is switched to the input of the ramp generator, then the ramp time decreases accordingly. For type T5 with 5 ramp times, each command value has one ramp time adjustment potentiometers ( t1 to t4 ). If command values 1 to 4 are not called up, the potentiometers t5 becomes effective. For type T1 with 1 ramp time, potentiometers t1 is effective for all command values. The ramp time can be external adjustable via terminals a14 and c14, however, when using an external ramp time potentiometer, the internal potentiometer for the ramp time must be set at maximum. The maximum ramp time decreases because the resistance of the external potentiometer is switched parallel to the internal potentiometer (approx. 500 kω). External time potentiometer and ramp "Off" By switching virtual relay K5 or via an external jumper, the ramp time is set to its lowest value (approx. 30 ms) Step function The output signal of the ramp generator [4] runs parallel to the summator [6] and the step function generator [5]. The step function generator produces a polaritydependent constant step signal with the command value voltages which is added to the output signal of the ramp generator. This step function causes the rapid travelling across the overlapping area of the valve spool. Initial current If the command value signal is smaller than ± 2 % (step function still ineffective) a pilot current of 50 ma flows through both solenoids. It is used to maintain the pulse frequency, the pre-magnetization of the electromagnet, and to make the electromagnet in the command values input initiate position by a quick start. Measurement ports The output signal of the summator [6] is the command current value and is led to the two current regulators [7] and to the test point "W" on the front panel of the card. A voltage of 6 V at the command value test point corresponds to a command value of 100 %. The actual values of the currents through the two solenoids can be measured separately at the test points "I A " (solenoid "a") and "I B " (solenoid "b"). Here a current of 1.5 V corresponds to a voltage of 1.5 A. Fault detection The signal "Ready for operation" [10] and the green LED " " on the front panel are illuminated when: the release signal is present the internal ± 9 V voltage supply is functioning properly (amplitude and symmetry) no short circuit of the solenoid lines is present the current input (with connection of the input amplifier [2] for 4 to 20 ma) does not report any errors [10] In case of an error, both output stages are immediately switched off and the message "Ready for operation" is reset. After removing the error, the card is immediately able to function again; "Ready for operation", however, is signaled after a delay of 75 ms (± 30 %) so that even short-term disturbances can be recorded by a PLC. [ ] = Allocation in block circuit diagram pages 4 and 5 RT-VSPA2-50 3 / 12 www.rebotech.cn
Block circuit diagram (type T1) www.rebotech.cn 4 / 12 RT-VSPA2-50
Block circuit diagram (type T5) RT-VSPA2-50 5 / 12 www.rebotech.cn
Technical data (For applications beyond these parameters, please consult us!) Operating voltage Functional range: -Upper limit value -Lower limit value U B U B (t) max U B (t) min 24 VDC + 40 % - 20 % 35 V 19 V Power consumption P s < 55 VA Current consumption I < 2 A Fuse I S 3.15 AT Input: -Command values 1 to 4 U i ± 9 V (reference potential is M0) -Command value 5 U i ± 6 V (reference potential is M0) -Command value 6 (differential input) U 0 to ± 10 V;R i = 100 kω or I i 4 to 20 ma;load R i = 100Ω or I i (4 ma = -100 %; 12 ma = 0 %; 20mA = +100 %) 0 to ± 20 ma -Release Active U E > 8.5 V Not active U E < 6.5 V Ramp time (setting range) t 30 ms to approx.1 s or 5 s Output: -Output stage Solenoid current / resistance I max Biasing current I min Initial current I V Pulse frequency f -Signal Ready for operation in condition ready for operation with error -Regulated voltage -Measurement sockets (reference potential is M0) Command value W U Actual current value I A and I B U A ; U B Type of connection U U U 1.5 A; R (20) = 2Ω 500 ma ± 25 % 50 ma ± 25 % 210 Hz ± 10 % > 16 V; 50 ma U < 1V; R i = 10 kω ± 9 V ± 1 %; ± 20 ma; externally loadable 0 to ± 6 V; R i = 1 kω 1 mv = 1 ma; R i = 1 kω 32 pin blade connector, DIN 41 612, form D Card dimensions Euro-card 100 160 mm; DIN 41 494 Front panel dimensions 40 128.4 mm Permissible operating temperature range - 5 to 50 Storage temperature range - 25 to 85 Weight m 0.16 kg www.rebotech.cn 6 / 12 RT-VSPA2-50
Pin assignment Terminal Line c Line a 2 Ready for operation Auxiliary voltage ± 9 V 4 Convert the polarity of the auxiliary voltage Command value call-up 2 6 Command value call-up 4 Command value call-up 3 8 Command value call-up 1 Command value 3 ± 9 V 10 Command value 1 ± 9 V Command value 2 ± 9 V 12 Command value 5 ± 6 V Command value 4 ± 9 V 14 External ramp External ramp 16 Command value 6 Differential input Command value 6 reference potential of differential input or GND 18 Ramp off call-up Command value after ramp 20 Regulated voltage + 9 V Reference potential of ± 9 V regulated voltage 22 Reserve Solenoid b 24 Reserve Solenoid a 26 Regulated voltage - 9 V Operating voltage 0 V 28 Starting voltage of relay(+ 24 V) Solenoid b 30 External release Solenoid a 32 Reserved pin of operating voltage +UB Operating voltage +UB Output curve I min : Blasing current of solenoid a and b, setting with potentiometers Ba and Bb seperately I max : Maximum current of solenoid a and b, setting with potentiometers Gwa and Gwb seperately RT-VSPA2-50 7 / 12 www.rebotech.cn
Display / setting elements LED and potentiometers on the front panel Green LED displays Ready for operation Yellow LED displays Enable H1 to H4 Yellow LED displays for command value call-ups R1 to R4 Command value potentiometers, clockwise increase t1 to t5 Ramp times (with VT-VPSA2 /T5), clockwise increase t Ramp time (with VT-VPSA2 /T1), clockwise increase Measurement socket W Command solenoid current value I A Actual current value solenoid a I B Actual current value solenoid b Meaning of DIP switches and jump on the card for the settings Set value ± 10 V ON OFF OFF OFF ramp time enable 4 20 ma OFF ON ON ON 5s OFF Int. ON 0 ±20 ma ON ON ON OFF 1s ON ext. OFF J1 J2 J3 J4 J5 J7 Note: = Settings carried out by the customer = Delivery state J6 = invalid www.rebotech.cn 8 / 12 RT-VSPA2-50
Unit dimensions (in mm) Model T1 Model T5 Circuit examples Example 1: Use internal potentiometer as value-setting device When contact 1 switched on, command value 1 is started, solenoid b has control current, the actuator (hydraulic cylinder or motor) moves in a certain direction; the speed is set by R1 on the front panel. When contact 1switched off and contact 2 switched on, command value 2 is started, solenoid a has control current, the actuator (hydraulic cylinder or motor) move in the other direction; the speed is set by R2 on the front panel. RT-VSPA2-50 9 / 12 www.rebotech.cn
Example 2: Use external potentiometer as value-setting device When +24V is supplied to pin c8, command value1 is started, solenoid b has control current, the actuator (hydraulic cylinder or motor) moves in a certain direction; the speed is set by R11 on the front panel. When +24V is supplied to pin a4, command value 2 is started, solenoid a has control current, the actuator (hydraulic cylinder or motor) moves in the other direction Caution: When the external potentiometer is applied, the corresponding internal potentiometer should be clockwise adjusted to maximum; otherwise the external potentiometer set value will be weakened or limited. Example 3: Use PLC, CNC or PC as value-setting device Use external independent value-setting device amplifier, differential input ports c16 and a16 should be applied. Caution: When external independent value-setting device are used, both signal wires should be connected to or disconnected from input ports simultaneously. www.rebotech.cn 10 / 12 RT-VSPA2-50
Project / maintenance instructions / additional information The amplifier card may only be unplugged or plugged in when switched off! Do not use plugs with free wheel diodes or LED displays when connecting the solenoids! Measurements at the card may only be carried out with instruments R i > 100 k! For switching the command values, use relays with gold contacts (small voltages, small currents)! When using external control, the control voltage may have a residual ripple factor of a maximum of 10%! Always shield command value cables; connect the shield to 0 V operating voltage on the card side, and leave the other side open (danger of earth loops)! Recommendation: Also shield solenoid cables! For solenoid cable lengths up to 50 m, use cable type LiYCY 1.5 mm 2. For greater lengths, please consult us! The distance to aerial, radio sources and radar equipment must be at least 1 m! Do not lay solenoid and signal lines near power cables! Because of the loading current of the smoothing capacitor on the card, pilot fuses must be of slow-blowing type! Warning: When using the differential input, both inputs must always be switched on or off simultaneously! Electrical signals generated via control electronics (e. g. signal "Ready for operation") must not be used for switching safety-relevant machine functions. (See also the European standard "Safety requirements for fluid power systems and components Hydraulics", pren 982) RT-VSPA2-50 11 / 12 www.rebotech.cn
Notes Hangzhou ReboTech Co., Ltd. ADD: 6th Floor, Building 5, Zhejiang Overseas High-level Talents Innovation Park,No.998 Wenyi Road, Hangzhou, P.R.China. P.C: 311121 Tel: +86-571-87205670 (Business Dept.) +86-571-87205672 (Hydraulic Dept.) +86-571-87206762 (Electronic Dept.) The specified data is for product description Fax: +86-571-87205671 (Business Dept.) purposes only and may not be deemed to be +86-571-87203467 (Hydraulic Dept.) guaranteed unless expressly confirmed in the +86-571-87206829 (Electronic Dept.) contract. Email: rebotech@gmail.com Web: www.rebotech.cn www.rebotech.cn 12 / 12 RT-VSPA2-50