Valve amplifiers for proportional directional valves VT-MRPA1-1-1X, VT-MRPA1-2-1X

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:

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

Technical data

General

Voltage supply

Analog inputs

Digital inputs

Solenoid outputs

Position transducer

Adjustment options

Measuring sockets

Displays

Supplementary information

(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

Measuring sockets

Symbols/Circuit diagrams

Dimensions

Project planning information

Commissioning

Downloads

	モジュール形アナログアンプ 4WRE-2X用 Data Sheet | RJ30219 | 2005-06-01 | Japanese | PDF | 265k Product Groups: Analog, Modular design 形式 VT-MRPA2 および VT-MRPA1
	Moduli amplificatori analogici per valvole direzionali proporzionali 4/3 e 4/2 (4WRE) tipi VT-MRPA2 e VT-MRPA1 Data Sheet | RI30219 | 2005-06-01 | Italian | PDF | 1.1MB Product Groups: Analog, Modular design
	Analogue amplifier modules for 4/3 and 4/2 proportional directional valves 4WRE Data Sheet | RE30219 | 2005-06-01 | English | PDF | 120k Product Groups: Analog, Modular design
	Analoge Verstärkermodule für 4/3- und 4/2-Proportional- Wegeventile 4WRE Data Sheet | RD30219 | 2005-06-01 | German | PDF | 122k Product Groups: Analog, Modular design
	Analogue amplifier modules for 4/3 and 4/2 proportional directional valves 4WRE - CHINESE Data Sheet | RC30219 | 2005-06-01 | Chinese | PDF | 579k Product Groups: Analog, Modular design
	Módulo amplificador analógico para válvulas direccionales proporcionales 4WRE de 4/3 y 4/2 vías Data Sheet | RS30219 | 2005-06-01 | Spanish | PDF | 120k Product Groups: Analog, Modular design
	Modules amplificateurs analogiques pour distributeurs proportionnels à 4 voies et 3 positions et à 4 voies et 2 positions 4WRE Data Sheet | RF30219 | 2005-06-01 | French | PDF | 120k Product Groups: Analog, Modular design