RA 29 926/06.98 RA Electronic amplifier for the control of 29 926/06.98 proportional valves without position control Model VT 3006, Series 3X Replaces: 02.96 The amplifier VT 3006-3X is suitable for the control of pilot operated proportional directional valves (WRZ, Series 6X and older) and direct operated pressure valves (DBEP6, 3DREP6, Series 1X) without position feedback. Characteristics: – Four command values adjustable with potentiometers – Four command value call-ups with LED display – Differential input – Step function generator – Ramp generator with five ramp times – Two pulsed current output stages – Polarity protection for the voltage supply Note: VT 3006-3X When supplied the amplifiers have a ramp time of 5 s. (Setting of the ramp time of 1 s see page 5) Card Holder: – CH32C-1X, see RA 29 921 – VT 3002-2X/32, see RA 29 928 Output curve Solenoid A Solenoid B 800 600 400 200 0 –100 –50 –1 +1 +50 +100 Command value in % 1/6 Output current in mA H/A 4240/94 RA 29 926/06.98 Technical data (For application outside these parameters please consult us!) 1 Operating voltage ) V 24 VDC; + 60 %; – 5 % DC Function range – upper limit value (momentary value) V (t) 39 V DC max – lower limit value (momentary value) V (t) 22 V DC min Power consumption I < 1 A (with loading current) Fuse I 2.5 A time lag, M5 x 20 S Inputs – Command values 1 to 4 V ± 9 V (reference potential is M0) e – Command value 5 V ± 6 V (reference potential is M0) e – Command value input 6 (Differential input) V 0 to ±10 V; R = 100 kΩ e e Relay data – Nominal voltage V Operating voltage V DC – Threshold voltage V 16.8 V – Return voltage V 2.4 V – Coil resistance R 2150 Ω Ramp time (setting range) t 30 ms to ca. 1 s or 5 s Controlled voltage V ± 9 V ± 1 %; 50 mA externally loadable . Solenoid current I 800 mA; R = 19.5 Ω max (20) – Pilot current I 20 mA ± 25 % – Pulse frequency of output stages f 170 Hz ± 10 % Test points – Command value wV± 6 V; R = 5 kΩ i – Actual current value I , I V V 0 to 800 mV 0 to 800 mA A B A, B Type of connection 32-pin terminal strip, DIN 41 612, type D Card dimensions Euro-card 100 x 160 mm, DIN 41 494 Front plate dimensions – Height 3 U, 5.06 in (128.4 mm) – Width soldering side 1 HP, 0.20 in (5.08 mm) = 1 division – Width component side 7 HP = 7 divisions Permissible operating temperature t +32 … +122 °F (0 … 50 °C) to DIN/IEC 68-2, T1, T2, T14 2 and T30 ) 2 Storage temperature range t –13 … +185 °F (– 25 … 85 °C) ) 2 Disturbance resistance Class 3 to DIN/VDE 843 T2 and T4 ) 2 Mechanical loadability to DIN/IEC 68-2, T6, T24 and T27 ) Weight m 0.33 lbs (0.15 kg) 1 ) To guarantee the maximum solenoid current for the 19.5 Ω solenoid in the highest solenoid temperature range the operating voltage must be at least 28 VDC ! 2 ) For further details, please consult us ! 2/6 RA 29 926/06.98 Block circuit diagram / terminal connection VT 3006 – 3X ––––– – – 3/6 F = on front plate 1 Command values 5 Step function R7 = Pilot current solenoid "A" H1 to H4 = 2 Differential input LED-display for command value call-ups 7 Current amplifier with R8 = Pilot current solenoid "B" 3; 6 Summation K1 to K6 = Call-up relay pulse generator t1 to t5 = Ramp times 4 Ramp generator R1 to R4 = Command values 8 Power supply X1 Positive command value K4.2 K3.2 K2.2 controls solenoid "B" Current command value at "w" K1.2 0 to + 6 V for solenoid "A" X1 t5 t4 t3 t2 t1 Negative command value 0 to – 6 V for solenoid "B" controls Solenoid "A" 14c Current / at "I " F F F F F 14a A A 7 Current / at "I " B B mV ≅ mA 12c Command value 5 6 V (0 to 700 mV) 12a Command value 4 9 V w R7 8a 7 Command value 3 9 V Solenoid "A" 7 10a 30a Command value 2 9 V F V 10c I -1 Command value 1 9 V F F F F Σ R1 R2 R3 R4 5 K5 I A 24a 3 4 6 F I B 1 Σ F Σ K4 K3 22a K2 J5, J6 K1 7 7 Differential 2 16a V input Σ 28a Command value 2 10 V V I 16c V Reference potential/ Solenoid "B" GND 18a R8 Command value after ramp – 2a K6 9 V Aux. voltage + 32c 8 2.5 A MT 32a + V Measuring zero (M0) is 20c DC + 9 V = raised by 9 V compared 20a M0 Operating to 0 V operating voltage! 26c 2200 μF – 9 V voltage F 1 26a 8c K1 H1 Call-up command value 1 0 V F 4a K2 H2 Call-up command value 2 F 6a K3 H3 Call-up command value 3 F 6c K4 H4 Call-up command value 4 18c K5 Call-up "Ramp Off" 4c K6 Call-up "switch-over aux. voltage" 28c Relay call-up voltage (+ 24 V) RA 29 926/06.98 Function description With the command value inputs 1 to 4 command values can be The added ramp generator [4] produces a ramp-like output called up [1] by operating the corresponding relays (K1 to K4). The signal from the jump-like given input signal. The time constant command value voltage is either given directly through the con- can be set with the potentiometers "t1" to "t5". The ramp time trolled voltages ±9 V of the power supply [8] or via an external given refers to a command value jump of 100% and can be - 1 command value potentiometer. For these inputs ± 9 V is ± 100% ). according to the setting through the selection via jumpers - If these four command value inputs are directly connected to the approximately 1 s or 5 s. If a command value jump smaller than controlled voltages ±9 V, four different command values can be set 100% is switched to the input of the ramp generator the ramp at the potentiometers R1 to R4. When using external command time shortens appropriately. value potentiometers at these inputs the internal potentiometers External time potentiometer and ramp "OFF" also function as limiters when these are not set to maximum. Clockwise increases the command value. External command value potentiometer 14a Ramp “controllable” 500 K 10c (10a, 8a, 12a) inputs time: min. = 0 14c time: min. = 500 k 20c + 9 V 26a 5 K Control 20a M0 "Solenoid B" 14a 26a Ramp “On/Off” 14c 10c (10a, 8a, 12a) inputs 26c – 9 V 5 K Note: Control 20a M0 When using an external time potentiometer the internal "Solenoid A" potentiometer for the ramp time must be set at maximum. 26a The maximum ramp time decreases because the resistance of the external potentiometer is connected parallel to the internal 10c (10a, 8a, 12a) inputs potentiometer! 20c + 9 V 5 K Control By switching the relay K5 or through an external bridge the ramp 26c – 9 V "Solenoids A + B" time is set to its minimum value (approx. 30 ms). 26a 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 polarity-dependent constant step signal with Which command value is called up is indicated by the LEDs H1 to the command value voltages which is added to the output signal of H4. If more than one command value is called up simultaneously, the ramp generator. This step function causes the rapid travelling the input with the highest number has priority. Example: If across the overlapping area of the valve. command value 1 and command value 3 are activated The output signal of the summation [6] is the command current simultaneously, the command value 3 becomes effective. value and is led to the two current output stages [7] and to the test An auxiliary output on the card provides a supply voltage for the point "w" on the front plate of the card. A voltage of 6 V at the command value call-ups which can be switched over from +9 V to command value test point corresponds to a command value of 1 –9 V with the relay K6 ). 100%. A positive command value signal at the input of the amplifier Each one of the four command call-up values has an adjustable controls the output stage for solenoid B, a negative command ramp time allocated (t1 to t4). If no command value is called up the value signal the output stage for solenoid A. If the command value ramp time t5 becomes effective. Clockwise increases ramp time. signal is smaller than ±1% (step function still ineffective) a pilot current of 20mA flows through both solenoids. The actual values All relays on the card are switched with 24 VDC (smoothed). of the currents through the two solenoids can be measured Additionally, the direct command value input 5 is available for the separately at the test points I (solenoid A) and I (solenoid B). 1 A B input voltage 0 to ±6 V. Valid is ± 6V = ± 100 % ). Here a current of 800 mA corresponds to a voltage of 800 mV. 2 The command value input 6 is a differential input (0 to ± 10 V) ). When using external electronics, this differential input must be used. When switching on or off the command value, both signal 1 ) = Reference potential for the command values 1 to 5 is M0 lines should be separated from or connected to the input. (measuring zero). All command values are summed with the correct value and sign 2 ) = Reference potential for the differential input should be before they are connected further.[3]. grounded to 0 V at source end. [ ] = Allocation in block circuit diagram 4/6 RA 29 926/06.98 Display / setting elements VT 3006 – 3X Max. ramp time Plug-in board with approx.1 s or 5 s potentiometers t1 to t5 H11 - yellow LED display "power on" H12 - green LED display "no fault" J6 R1 / H1 - Command value 1 with LED display t1 R1 R2 / H2 - Command value 2 with LED display J5 t2 R2 R3 / H3 - Command value 3 with LED display t3 R3 R4 / H4 - Command value 4 with LED display t4 R4 t5 F1 2.5 A MT w - Command value solenoid current I - Actual current value solenoid B B I - Actual current value solenoid A A Meaning of the jumpers on the card for the settings (Label on the back of the frontplate) bridge plugged in ramp time Jx = bridge bridge open 5 s J5 J6 Jx = open 1 s J6 = delivery state delivery condition J5 Ramp time Note: The loss of unused jumpers can be avoided by plugging the jumpers into only one pin. Project / maintenance instructions / additional information – The amplifier card may only be plugged in or unplugged when power is off! – Do not use plugs with fly back diodes or LED displays when connecting the solenoids! – Only carry out measurements on the cards with instruments R > 100 kΩ! i – Measuring zero (M0) is raised by + 9 V compared to 0 V operating voltage and is not potentially separated , i.e. –9 V controlled voltage 0 V operating voltage . Therefore do not connect measuring zero (M0) to 0 V operating voltage! – When switching command values use relays with gold contacts (small voltages , small currents)! – When switching card relays only use contacts with a loadability of approx. 40 V, 50 mA! When controlling externally the control voltage may have a maximum residual ripple of 10%! – Always shield command value lines; connect screen to 0 V operating voltage on the card side, other side remains open (danger of earth loops)! Recommendation: Also shield solenoid lines! 2 Use cable type stranded 16 AWG ( LiYCY 1.5 mm ) for solenoid lines of up to 50 m in length. – Minimum distance to aerial lines, radio sources and radar equipment must be at least 1 m! – Do not lay solenoid and signal lines near power lines! – Because of loading current for the smoothing capacitor on the card, fuse should be time lag! – Warning: When using the differential input, both inputs must always be switched on or off simultaneously! (Use DPDT dry contacts) – When using the differential input, an isolated analog common should be grounded to 0 V from the card’s power source, at one point on the source end. 5/6 X1 RA 29 926/06.98 Ordering code VT 3006 – 3X/ * Amplifier for proportional valves without position control Further details in clear text Series 30 to 39 = 3X (Series 30 to 39: technical data and terminal connections unchanged) Unit dimensions: dimensions in inches (millimeters) H11 H12 R1 t1 H1 t2 R2 3.94 H2 (100) t3 R3 3U H3 5.06 3.50 R4 t4 (128.4) (89) H4 t5 0.59 w (15) I B I A VT 3006 0.08 8HP (2) 0.28 1.59 0.28 6.50 (7) (40.3) (7) (165) 7.32 (186) Mannesmann Rexroth Corporation Rexroth Hydraulics Div., Industrial, 2315 City Line Road, Bethlehem, PA 18017-2131 Tel. (610) 694-8300 Fax: (610) 694-8467 Rexroth Hydraulics Div., Mobile, 1700 Old Mansfield Road, Wooster, OH 44691-0394 Tel. (330) 263-3400 Fax: (330) 263-3333 6/6 All rights reserved – Subject to revision Printed in U.S.A.