HESS Hydraulic Equipment Systems and Solutions

Гидравлическое Оборудование Системы и Решения

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Command value and ramp card VT-SWKA1-1X

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Command value and ramp card VT-SWKA1-1X

  • Component series 1X
  • Analog, Euro-card format
  • For controlling valves with integrated or external electronics
  • Differential inputs for voltage and current
  • Four callable command value inputs, input for ramp time
  • Digital inputs for enable, ramp, inverting and command value call-up
  • Control outputs for voltage and current
  • Ramp time selection with quadrant recognition
  • Reverse polarity protection for the operating voltage
  • Switchable measuring socket
  • "Ready for operation" output
  • Characteristic curve correction through separately adjustable step-change heights and maximum values

Component series

  1X

Type of electronics

  Analog

Design

  Euro-card

 

Value at measuring socket "v"

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

General information

The command value card is set up as printed circuit board in europe format and suitable for installation in a rack. An internal power supply unit  [1] supplies all internally required positive and negative supply voltages. If the power supply unit is in operation and no error is detected, the green LED on the front plate is lit and the "ready for operation" signal is set.

Current input [3]

There is no switch-over between current and voltage input. Both inputs are permanently available (see terminal assignment). The input signals are internally normalized and added up. The zero point and the value range of the current input can be switched using jumper J5.

Command value call-ups [4]

Four command value signals "w1" to "w4" can be called up. The external command value voltages (command value 1 to 4) are either defined directly by the regulated voltage outputs +10 V and –10 V or by external potentiometers. If these command value inputs are directly connected to the regulated voltages, the command values are set at the potentiometers "w1" to "w4". When using external potentiometers, the internal potentiometers will function as attenuators or limiters.

Only one call-up can be operated at a time. If several call-ups are operated simultaneously, call-up "1" has the lowest priority and call-up "4" has the highest priority.

The respective active call-up is indicated by a yellow LED on the front plate.

Command value inversion [7]

The command value created internally from the input signals, the command value call-ups and the zero point offset signal can be inverted by an external signal or jumper J1. If an external inverting signal is connected, this is indicated by an LED ("–1") on the front plate.

Enable function [8]

The enable function switches the input signal of the ramp generator on or off. If enable is switched on or off, the control output changes with the set ramp time irrespective of the command value. Thus, a controlled valve does not open or close abruptly. If an error signal occurs, the ramp generator input signal is also set to 0 %. The enable signal is indicated by an LED on the front plate.

Ramp generator [9]

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.

Using jumper J2, the ramp time is set to a minimum (<2 ms) (ramp off).

External ramp time setting:

Using an external potentiometer, the internally set ramp time can be extended. The setting can be verified by means of the measuring socket. In case of a cable break, the internal default setting will be valid automatically.

Information on ramp time settings and measurement:

By reconnecting the jumper J3, the ramp times specified above can be increased tenfold.

Ramp status signal [11]

The "ramp ready" status signal indicates that the control output has reached the desired end value. By means of this signal (24 V output), superior sequence controls can be more easily synchronized with the valve function or the controlled hydraulic function.

Characteristic curve generator [12]

Using the adjustable characteristic curve generator, step level and maximum values for positive and negative signals can be set separately, adjusted to the hydraulic requirements. The actual development of the characteristic curve through the zero point is not stepped but linear.

Amplitude limiter [13]

The control outputs (current output and voltage output) are limited to approx. ±110 % of the nominal range.

Fault recognition [14]

The internal operating voltages and the voltage outputs are monitored and, if the jumper J7 (1-2) is connected, the current output is checked for cable break. If there is no error, the green "ready for operation" LED is lit and the "ready for operation" output is switched to 24 V (operating voltage).

Measuring points [15]

A measuring socket on the front plate is provided for verifying the settings of the command value call-up, the ramp times and further internal signals. The measuring points are selected via the measuring point selector switch which is also located on the front plate. The signal of the measuring socket is also connected to the male multipoint connector (b26).

[ ] = Assignment to the block diagram

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