Артикул: RX7129
Valve amplifiers for proportional directional valves VT-MRPA1-1-1X, VT-MRPA1-2-1X
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Description
- Component series 1X
- Analog, Modular design
- For 4/2-way proportional directional valves 4WRE (with one solenoid)
Features
- Differential input for voltage
- Ramp generator with separately adjustable ramp times "up/down"
- Adjustable zero point and sensitivity
- Adjustable step level
- Cable break detection for actual value cable
- Reverse polarity protection for the operating voltage
- LED displays for ready for operation and enable
Product description
General information
The amplifier modules are snapped onto top hat rails according to EN 60715. The electrical connection is established via screw terminals. The modules are operated with 24 V direct voltage.
Power supply unit [1]
The amplifier modules have a power supply unit with making current limiter. This unit supplies all internally required positive and negative supply voltages.
Command value presetting
The internal command value signal is calculated from the total [3] of the external command value signal available at the differential input [2] and the zero point offset (zero point potentiometer "Zw"). A positive command value results in a current increase in the solenoid.
Enable function [11]
The enable function enables the current output stages and forwards the internal command value signal to the ramp generator. The enable signal is indicated by an LED on the front plate. If enable is connected, the internal command value is changed (with any kind of command value presetting) by the set ramp time. Thus, a controlled valve does not open abruptly.
Ramp generator [4]
The ramp generator limits the incline of the control output. The downstream step functions and amplitude attenuators do not extend or shorten the ramp time.
Information on ramp time setting and measurement:
| Value at measuring socket | U/V | 5 | 3 | 2 | 1 | 0.5 | 0.3 | 0.2 | 0.1 | 0.05 | 0.03 | 0.02 |
| Current ramp time (±20 %) | t/ms | 20 | 33 | 50 | 100 | 200 | 333 | 500 | 1000 | 2000 | 3333 | 5000 |
Formula for calculation of the ramp times:
t in ms, U in volt at the measuring socket
Characteristic curve generator [5]
Using the adjustable characteristic curve generator, step level and maximum values can be adjusted to the hydraulic requirements. The actual development of the characteristic curve through the zero point is not stepped but linear.
Amplitude limiter [6]
The internal command value is limited to approx. +110 % of the nominal range.
Oscillator [9]
The oscillator creates the control signal for the inductive position transducer.
Demodulator [10]
The demodulator supplies the actual value signal of the control spool position from the position transducer signal.
+100 % ≙ +10 V
Controller for the control spool position [7]
The position controller is optimized in a valve-specific manner.
Current output stage [8]
The current output stage creates the clocked solenoid current for the proportional valve. The solenoid current is limited to 2.4 A to 2.6 A. The output stage output is short-circuit-proof. The output stage is de-energized in case of an internal fault signal or if the enable signal is missing.
Fault recognition [14]
The position transducer cable is monitored for cable break and short-circuits on the primary side as well as for over-currents at the output stage.
[ ] = Assignment to the block diagram
Type code
| 01 | Valve amplifier for proportional directional valves with electrical position feedback, analog, euro-card format | VT-MRPA |
| 02 | For valves: 4WRE (with one solenoid) | 1 |
| 03 | For valves: 4WRE 6...2X | 1 |
| For valves: 4WRE 10...2X | 2 | |
| 04 | Component series 10 ... 19 (10 ... 19: unchanged installation and connection dimensions) | 1X |
| 05 | Version: standard | V0 |
| 06 | Further details in the plain text | * |
| 01 | 02 | 03 | 04 | 05 | 06 | ||||
| VT-MRPA | 1 | ‒ | ‒ | 1X | / | V0 | / | * |
Technical data
General
| Component series | 1X | |
| Type of electronics | Analog | |
| Design | Modul |
Voltage supply
| Operating voltage | Nominal | U | V | 24 |
| Lower limit value | UB(t)min | V | 18 | |
| Upper limit value | UB(t)max | V | 35 | |
| Power consumption | max. | PS max | VA | 24 |
| Current consumption | max. | I | A | 2 |
| Fuse | Thermal overload protection (with restart if the value falls below the temperature threshold) | |||
Analog inputs
| Command value | Voltage (differential input) | U | % | 0 ... 10 | |
| Voltage (differential input) | Input resistance | R | kΩ | ≥ 50 | |
Digital inputs
| Enable | On (active) 1) | U | V | 8.5 ... UB |
| Off (inactive) | U | V | 0 ... 6.5 |
| 1) | Re > 100 kΩ |
Solenoid outputs
| Solenoid current | max. | Imax | A A | 2.5 |
| Clock frequency (freely clocking) | f | Hz | 5 kHz | |
| Solenoid output | Other properties | Short-circuit-proof, clocked | ||
Position transducer
| Oscillator voltage | U | V | 10 (I = 10 mA) |
| Oscillator frequency | U | V | 5.6 |
Adjustment options
| Zero point calibration | % | ± 30 | |
| Amplitude attenuator 1) | for command value | % | 0 ... 110 |
| Zero point | actual valve position value | % | ±10 |
| Ramp time up/down | s | 0.02 … 5 | |
| Step-change height | % | 0 ... 50 | |
| 1) | Applies to a step level setting of 0% |
Measuring sockets
| Command value | "w" | V | 0 ... 10 | |
| after ramp | "wR" | V | 0 ... 10 | |
| Ramp time | “down" | s | 0.02 ... 5 | |
| “up" | s | 0.02 ... 5 | ||
| Actual value | "x" | V | 0 ... 10 | |
Displays
| LED display | green | Ready for operation | |
| yellow | Enable |
Supplementary information
| Anschlussart | 12 screw terminals | ||
| Mounting type | Top hat rail TH 35-7.5 according to EN 60715 | ||
| Type of protection according to EN 60529 | IP 20 | ||
| Ambient temperature range | ϑ | °C | 0 … 50 |
| Storage temperature range | ϑ | °C | -25 … 70 |
| Weight | m | kg | 0.14 |
(For applications outside these values, please consult us!)
Notice:
For information on environment simulation testing for the fields EMC (electro-magnetic compatibility), climate and mechanical load, see data sheet 30219-U
Operating and display elements
LED displays
| Ready for operation (green) | |
| Enable (yellow) |
| Gw | Amplitude attenuator |
| Sw | Step-change height |
| Zw | Zero point command value |
| Zx | Zero point actual value |
| t <
| Ramp time "Ramp up" |
| t >
| Ramp time "Ramp down" |
Measuring sockets
| t <
| Ramp time "Ramp up" |
| t >
| Ramp time "Ramp down" |
| x | Actual value |
| w | Command value |
| wR | Command value after ramp |
| ⊥ | Reference potential |
Symbols/Circuit diagrams
| Zw | Zero point command value |
| Zx | Zero point actual value |
| t <
| Ramp time "Ramp up" |
| t >
| Ramp time "Ramp down" |
| Sw | Step-change height |
| Gw | Amplitude attenuator |
| Gx | Sensitivity actual value |
| w | Command value |
| x | Actual value |
| wR | Command value after ramp |
| Ready for operation (green) | |
| Enable | |
| 1 | Power supply unit |
| 2 | Differential amplifier |
| 3 | Command value summation |
| 4 | Ramp generator |
| 5 | Characteristic curve generator |
| 6 | Amplitude limiter |
| 7 | Valve position controller |
| 8 | Power output stage |
| 9 | Oscillator |
| 10 | Demodulator |
| 11 | Enable |
| 12 | Proportional valve |
| 13 | Position transducer |
| 14 | Fault recognition |
Dimensions
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