| Electronics - Valve & Pump |
Proportional Amplifiers
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Flexible Hydraulic Systems with More Reliability
Proportional solenoids on hydraulic valves use electronic amplifiers to regulate the variable power through the full range of control. Intelligent proportional amplifiers can also provide ramp time settings to limit acceleration, preset potentiometers, and fault detection features – all designed to make your hydraulic system more flexible and operate with the highest levels of reliability and uptime.
Calibrated and optimized for corresponding valve families, Rexroth amplifiers reduce the need for field adjustments and maximize your performance.
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Data Sheet (PDF)
RA 29 864
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Model MDSD-2X Proportional Amplifier
Mobile dual solenoid driver (MDSD)
Series 2X
A high current amplifier that controls proportional valves with one or two force solenoids.
Key features:
- Wide supply voltage range 10–28 VDC
- Reverse voltage protection
- Pulse Width Modulated (PWM) outputs and PWM frequency adjustable from 75–275 Hz
Download MDSD-2X Proportional Amplifier Data Sheet
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Data Sheet (PDF)
RA 29 904
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Model VT 2000 Electrical Proportional Amplifier
Series 5X
A proportional amplifier suitable for controlling direct and pilot operated proportional pressure control valves without electrical position feedback.
Key features:
- Differential input
- Additional command value input, 0 to +9 V
- Separately adjustable ramp generator for up and down ramps
- Clocked current output stage
- Reverse polarity protection for voltage supply
- Short-circuit protection of solenoid cable
Download VT 2000 Proportional Amplifier Data Sheet
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Data Sheet (PDF)
RE 29 955
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Model VT 5035 Electrical Proportional Flow Control Amplifier
Series 1X
Used for adjusting the flow of Rexroth A4VSO and A4VSG variable displacement pumps.
Key features:
- Differential input
- Enable input with LED indicator lamp
- Ramp generator
- Four command values that can be adjusted by via potentiometer; call-up signalled by LEDs
- Controller for swivel angle
- Two clocked current output stages
- Oscillator and demodulator for inductive position measurement with cable break detection
- Reverse polarity protection for power supply
Download VT 5035 Proportional Control Amplifier Data Sheet
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Data Sheet (PDF)
RE 30 040
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Model VT-VRRA1 Electrical Proportional Amplifier
Series 2X
Designed for use with directly operated servo solenoid valves with non-linear curve motion characteristics in open and closed-loop applications.
Key features:
- Analog amplifiers in Eurocard format for installation in 19" rack
- Output stage with closed-loop control
- Short-circuit-proof outputs
- Valve zero adjustment option
- Open-circuit detection for feedback signal cable
- Closed-loop position control with PID action
- Area ratio adjustment of differential cylinders
- Gain in weak signal range
Download VT-VRRA1 Series 2X Proportional Control Amplifier Data Sheet
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Data Sheet (PDF)
RE 30 041
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Models VT-VRRA1 and VT-VRPA1 Electrical Proportional Amplifiers
Series 2X
Suitable for directly operated servo solenoid valves with linear curve motion characteristics in open and closed-loop applications.
Key features:
- Analog amplifiers in Eurocard format for installation in 19" rack
- Output stage with closed-loop control
- Short-circuit-proof outputs
- Valve zero adjustment option
- Open-circuit detection for feedback signal cable
- Closed-loop position control with PID action
Download VT-VRRA1 and VT-VRPA1 Proportional Control Amplifier Data Sheet
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Data Sheet (PDF)
RE 30 042
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Model VT-VRRA1 Electrical Proportional Amplifier
Series 1X
Suitable for directly operated servo solenoid valves with non-linear curve motion characteristics in open and closed-loop applications.
Key features:
- Analog amplifiers in Eurocard format for installation in 19" rack
- Output stage with closed-loop control
- Short-circuit-proof outputs
- Valve zero adjustment option
- Open-circuit detection for feedback signal cable
- Closed-loop position control with PID action
Download VT-VRRA1 Series 1X Proportional Control Amplifier Data Sheet
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Data Sheet (PDF)
RE 30 043
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Model VT-VRRA1 Electrical Proportional Amplifier
Series 2X
Designed for use with directly operated servo solenoid valves with non-linear curve motion characteristics in open and closed-loop applications.
Key features:
- Analog amplifiers in Eurocard format for installation in 19" rack
- Output stage with closed-loop control
- Short-circuit-proof outputs
- Valve zero adjustment option
- Open-circuit detection for feedback signal cable
- Closed-loop position control with PID action
- Area ratio adjustment of differential cylinders
- Gain in weak signal range
Download VT-VRRA1 Series 2X Proportional Control Amplifier Data Sheet
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Data Sheet (PDF)
RE 30 044
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Model VT-VRPA1 Electrical Proportional Amplifier
Series 2X
Suitable for applications actuating pilot operated servo solenoid valves (type 4WRL,series 3X)
Key features
- Analog amplifiers in Eurocard format for installation in 19" rack
- Output stage with closed-loop control
- Enabling input
- Short-circuit-proof outputs
- Adjustment options: valve zero
- Open-circuit detection for feedback signal cable
- Closed-loop position control with PID action
- Ramp functions:
External voltage-controlled ramp adjustment via differential inputs.
Ramp function can be deactivated
Download VT-VRPA1 Series 2X Proportional Control Amplifier Data Sheet
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Data Sheet (PDF)
RE 30 045
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Model VT-VRRA1 Electrical Proportional Amplifier
Series 2X
Suitable for actuating pilot-operated servo solenoid valves (type 4WRL, series 3X)
Key features:
- Analog amplifiers in Eurocard format for installation in 19" rack
- Output stage with closed-loop control
- Enabling input
- Short-circuit-proof outputs
- Adjustment possibilities: valve zero
- Open-circuit detection for feedback signal cable
- Closed-loop position control with PID action
Download VT-VRRA1 Series 2X Electrical Proportional Amplifier Data Sheet
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Data Sheet (PDF)
RE 30 046
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Model VT-VRRA1 Electrical Proportional Amplifier
Series 2X
Designed for driving directly operated pilot-operated servo solenoid valves with linear curve (type 4WRPH, series 2X)
Key features:
- Analog amplifiers in Eurocard format for installation in 19" rack
- Output stage with closed-loop control
- Enabling input
- Short-circuit-proof outputs
- Adjustment possibilities: valve zero
- Open-circuit detection for feedback signal cable
- Closed-loop position control with PID action
- Area ratio adjustment of differential cylinders
- Gain in weak signal range
Download VT-VRRA1 Series 2X Electrical Proportional Amplifier Data Sheet
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Data Sheet (PDF)
RE 30 047
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Model VT-VRPA2 Electrical Proportional Amplifier
Series 1X
Suitable for operating directly operated servo solenoid valves (type 4WRP, series 1X)
Key features:
- Analog amplifiers in Eurocard format for installation in 19" rack
- Ramp generator can be deactivated
- Deadband compensation
- Output stage with closed-loop control
- Enabling input
- Adjustment options include valve zero, sensitivity & ramp times
- Open-circuit detection for feedback signal cable
- Closed-loop position control with PID action
- Inputs and outputs (partially) short-circuit-proof
- External ramp deactivation
- External voltage-controlled ramp adjustment via differential inputs
Download VT-VRPA2 Electrical Proportional Amplifier Data Sheet
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Data Sheet (PDF)
RE 30 048
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Model VT-VRPA2 Electrical Proportional Amplifier
Series 1X
Suitable for operating directly operated servo solenoid valves (type 4WRP, series 1X)
Key features:
- Analog amplifiers in Eurocard format for installation in 19" rack
- Ramp generator can be deactivated
- Deadband compensation
- Output stage with closed-loop control
- Enabling input
- Adjustment options include valve zero, sensitivity & ramp times
- Open-circuit detection for feedback signal cable
- Closed-loop position control with PID action
- Inputs and outputs (partially) short-circuit-proof
- External ramp deactivation
Download VT-VRPA2 Electrical Proportional Amplifier Data Sheet
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Data Sheet (PDF)
RE 30 049
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Model VT-KRRA2 Electrical Proportional Amplifier
Series 2X
Designed for use in circuits with directly operated servo solenoid valves (type 4WRPH, series 2X). Applications include Synchronous running in presses and forming machines, and 2-axis control systems in machine tools.
Key features:
- Double card for simultaneous operation of two NG 6/NG 10 servo solenoid valves
- Output stage with closed-loop control
- Enabling input
- Short-circuit-proof outputs
- Valve zero adjustment option
- Open-circuit detection for feedback signal cable
Download VT-KRRA2 Electrical Proportional Amplifier Data Sheet
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Data Sheet (PDF)
RE 30 110
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Model VT-VSPA2-1-2X/ Analogue Amplifier Card
Suitable for controlling valve types 4WRA nominal sizes 6
and 10…2X, WRZ…7X and 3DREP…2X
- Inverting the internal command value signal via the 24V input or jumper
- Selecting the ramp time via quadrantal recognition (24V input) or ramp time call-ups (24V inputs) (option T5)
- Switching over the ramp time range via jumpers
- Characteristic curve correction by separately adjustable jump heights and maximum values
- Enable input
- ”Ramp on/off“ input
- Command value inputs:
- Differential input ± 10 V
- Four command value inputs, ±10 V that can be called up
- Current input 4 to 20 mA
Download VT-VSPA2-1-2X/ Analogue Amplifier Card Data Sheet
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Data Sheet (PDF)
RE 30 111
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Model VT-VSPA1-1 and VT-VSPA1K-1 Electrical Proportional Amplifiers
Series 1X
Suitable for controlling all direct and pilot operated proportional pressure control valves without electrical position feedback and featuring only one solenoid as actuator
Key features:
- Differential input, can be switched between voltage and current input
- Additional command value input, 0 to + 9 V
- Ramp generator, can be adjusted separately for up and down
- Clocked output stage
- Message “ready for operation” (VT-VSPA1K-1 with LED indicator lamp only)
- Reverse polarity protection for voltage supply
- Cable break detection for current input 4 to 20 mA
- Short-circuit protection of solenoid cable
- Cable break detection for solenoid cable
Download VT-VSPA1-1 and VT-VSPA1K-1 Electrical Proportional Amplifier Data Sheet
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Data Sheet (PDF)
RE 30 117
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Model VT-VRPA1-50 to VT-VRPA1-52 Analog Electrical Proportional Amplifiers
Series 1X
Designed for controlling pilot operated proportional flow control throttle valves with electrical position feedback, types FE (sizes _6 and 25) and FES (sizes 25 to 63)
- Compatible with amplifier types VT 50__, VT 50_2 and VT 5062 to VT 5066 (depending on valve type and size)
- Power supply unit with raised zero point
- Command value signal inputs:
- 0 to +6 V; 0 to +9 V; 0 to +_0 V
- 0 to 20 mA; 4 to 20 mA (jumpers)
- Potentiometer adjustment for zero point and amplitude attenuation on the front panel
- Measuring sockets for ramp time
- Enable input and “ramp OFF” input
- Jumpers for adjustment to valve type and size
- Outputs for command value (0 to +6 V) and actual value (0 to –6 V)
- LED indicator lamp “ready for operation“
- Reverse polarity protection
Download VT-VRPA1-50 to VT-VRPA1-52 analog electrical proportional amplifiers Data Sheet
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Data Sheet (PDF)
RE 30 118
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Model VT-VRPA1 Analog Electrical Proportional Amplifier
Series 1X
- Suitable for controlling direct operated proportional pressure control valves with electrical position feedback, type DBETR, and proportional flow control valves with electrical position feedback, type 2FRE(G)
- Plug-in connections compatible with those of amplifier types VT 5003, VT 5004 and VT 5010
- Power supply with raised zero point
- Command value signal inputs:
- 0 to + 6 V; 0 to + 9 V; 0 to + 10 V
- 0 to 20 mA; 4 to 20 mA (plug-in bridges)
- Potentiometer adjustment on the front plate for the zero point and amplitude attenuation
- Measurement sockets for the ramp time
- Enable input and “ramp off“ input
- Plug-in bridges for switching the maximum ramp times 0.02 to 5 s or 0.2 to 50 s
- Outputs for command value (0 to + 6 V) and actual value (0 to – 6 V)
- LED display “operational“
- Polarity protection
Download VT-VRPA1 analog electrical proportional amplifiers Data Sheet
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Data Sheet (PDF)
RE 30 126
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Model VT-VRPD-2 Digital Valve Proportional Amplifier
Digital valve amplifier for valve types 4WRE6, Series 2X and 4WRE10, Series 2X
- User data can be exactly reproduced and are protected against unintended or unauthorized changes
- Use of a powerful microcontroller
- Valve selection using operating software BODAC
- Command value input, optional as voltage or current interface
- Voltage input as differential input
- Command value input with variable input adjustment
- Ramp generator
- Digital inputs for calling pre-set command value parameters
- Switched-mode power supply unit for internal supply voltages
- Freely configurable measuring sockets X2 (X1 positively assigned to actual valve value)
- Configuration and parameterization via serial interface using PC software BODAC (CD:SYS-HACD-BODAC-01)
Download VT-VRPD-2 digital valve proportional amplifier Data Sheet
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Data Sheet (PDF)
RE 30 119
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Model VT-VRPA2-1X/ Analog Proportional Control Amplifier
Series 1X
Suitable for controlling valves with position feedback, type 4WRE, sizes 6 and 10, series 2X
- Designed as printed circuit board in Euro-format 100 x 160 mm and rack-installation ready
- Command value inputs:
- Differential input ± 10 V
- Four callable command value inputs ± 10 V
- Current input 4 to 20 mA
- Inversion of the internal command value signal via 24V input or by means of jumpers
- Selection of ramp time through quadrant recognition (24V input) or ramp time call-ups (24V inputs) (option T5)
- Changeover of the ramp time range by means of jumpers
- Characteristic curve correction by means of separately adjustable jump heights and maximum values
- Output signal “ready for operation“
Download VT-VRPA2-1X/ analog proportional control amplifier Data Sheet
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Data Sheet (PDF)
RE 30 052
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Model VT-VRPA1 Electrical Proportional Control Amplifier
Series 1X
- Output stage with closed-loop control
- Closed-loop position control with PID action
- Rapid energizing and de-energizing for fast response times
- Enabling input
- Short-circuit-proof outputs
- Open-circuit detection for feedback signal cable (partially)
- Zero and sensitivity adjustment possibilities
Download VT-VRPA1 electrical proportional control amplifier Data Sheet
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Data Sheet (PDF)
RE 30 053
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Model VT-VRPA1-527-2X/V0/RTS-2/2V Electrical Proportional Control Amplifier
Series 2X
Designed for sue with proportional cartridge throttle valves
- Closed-loop controlled output stage
- Enabling input
- Outputs short-circuit-proof
- Adjustment options – valve zero
- Open-circuit detection for feedback signal cable
- Closed-loop position control with PID action
- Ramp function:
- External voltage-controlled ramp adjustment via differential inputs
- Ramp function can be shut down
Download VT-VRPA1-527-2X/V0/RTS-2/2V electrical proportional control amplifier Data Sheet
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Data Sheet (PDF)
RE 30 054
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Model VT-VRPA1...RTP Electrical Proportional Control Amplifier
Series 1X
- Output stage with closed-loop control
- Closed-loop position control with PID action
- Rapid energizing and de-energizing for fast response times
- Enabling input
- Ramp can be adjusted and deactivated
- Open-circuit detection for feedback signal cable
- Short-circuit-proof outputs
- Adjustment possibilities for zero and sensitivity, acceleration and braking ramps
Download VT-VRPA1...RTP electrical proportional control amplifier Data Sheet
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Data Sheet (PDF)
RE 30 055
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Model VT-VRPA1-527-2X/V0/2/2V Electrical Proportional Control Amplifier
Series 1X
Suitable for control of proportional cartridge throttle valves
- Closed-loop controlled output stage
- Enabling input
- Outputs short-circuit-proof
- Adjustment possibilities – valve zero
- Open-circuit detection for feedback signal cable
- Closed-loop position control with PID action
Download VT-VRPA1-527-2X/V0/2/2V electrical proportional control amplifier Data Sheet
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Data Sheet (PDF)
RE 30 056
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Model VT-VRPA1...RTS Electrical Proportional Control Amplifier
Series 1X
- Output stage with closed-loop control
- Closed-loop position control with PID action
- Rapid energizing and de-energizing for fast response times
- Enabling input
- Disconnectible voltage-controlled or manually adjustable ramps
- Open-circuit detection for feedback signal cable
- Short-circuit-proof inputs and outputs
- Adjustment possibilities for zero and sensitivity, accelerating and braking ramps
Download VT-VRPA1...RTS electrical proportional control amplifier Data Sheet
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Data Sheet (PDF)
RE 30 109
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Model VT-VSPA1 Electrical Proportional Control Amplifier
Series 1X
- Differential input for setpoint voltage 0...+10 V
- Ramp generator with separate adjustment for up and down
- Zero potentiometer
- Closed-loop-controlled output stage
- LED display:
- Voltage supply
- On standby
- Ramp “Off”
- Solenoid current Im = 0
Download VT-VSPA1 electrical proportional control amplifier Data Sheet
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For more information or to order brochures and catalogs, contact your nearest distributor.
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