Артикул: RX7094
Valve amplifiers for high-response valves VT‑SR31‑1X ... VT‑SR38‑1X
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Description
- Component series 1X
- Analog, Euro-card format
- For valves: .WRC
Features
- Voltage input
- Controller for valve flow and main control spool position
- Oscillator/demodulator for inductive position feedback
- Enable input
- Output stage with dither signal
- Measuring instrument for valve flow display
- Reverse polarity protection for the operating voltage
Product description
The valve amplifiers operate with a push-pull output stage with bipolar transistors. The output of this output stage can be connected or disconnected by means of an enable circuit (relay K2). The enable is indicated by the LED "H2" on the front plate being illuminated. The switching voltage of all relays is defined by means of jumpers J12 and J13 to either 0 V or +UB (factory +UB).
The output stage consists of an I controller with connected dither signal generator. The amplitude of the dither signal is set by means of R7. The pre-stage (current command value) is controlled via a PD controller. The actual current value returned is simultaneously indicated by the instrument on the front plate.
For control, the following applies:
For valve type 2WRC:
A positive command value at connection 30a results in the main stage opening and a flow from A to B or B to A.
For valve type 3WRC:
A positive command value at connection 30a results in a flow from P to A in the main stage.
A negative command value at connection 30a results in a flow from A to T in the main stage.
The oscillator/demodulator senses the control spool position. It is designed as pluggable board the parameters of which are adapted to the respective valve type.
The PD controller is supplied the position command value and the position command value and the actual position value with the D share of the controller only affecting the actual value (velocity feedback).
The zero point can be set via R3 (NP) from the front plate.
The required symmetric operating voltage +UB is protected against reversed polarity. If the board is not equipped with any voltage regulators for supply of the controller and position transducer electronics, an additional stabilized auxiliary voltage ±UM is required. The auxiliary voltage port is protected against reversed polarity up to a maximum current of 1 A.
As an option, the amplifier can be equipped with a PID controller (D share only affects the actual value) with a switchable PI share and a backup relay with potential-free changeover contact. This controller can be used to superimpose a further control loop (e.g. for drive control). The P and D share can be set at the front plate. The controller switching status is indicated by the LED "H1", the relay at LED "H3" (LEDs illuminated if relays are applied). The PID controller fitting is customer-specific and therefore has to be specified in the order in plain text. These amplifiers receive a special type designation upon delivery. The backup relay is loadable up to 28 V and 0.5 A.
Type code
| 01 | Valve amplifier for high-response valves with servo valve control | VT-SR |
| 02 | For valves: .WRC 32…1X | 31 |
| For valves: .WRC 40…1X | 32 | |
| For valves: .WRC 50…1X | 33 | |
| For valves: .WRC 63…1X | 34 | |
| For valves: .WRC 80…1X | 35 | |
| For valves: .WRC 100…1X | 36 | |
| For valves: .WRC 125…1X | 37 | |
| For valves: .WRC 160…1X | 38 | |
| 03 | Component series 10 ... 19 (10 ... 19: unchanged installation and connection dimensions) | 1X |
| 04 | Without ±15 V voltage regulator | 0 |
| With ±15 V voltage regulator | 1 | |
| 05 | For valves with 2/2-way function | 2 |
| For valves with 3/2-way function | 3 | |
| 06 | Further details in the plain text | * |
| 01 | 02 | 03 | 04 | 05 | 06 | |||
| VT-SR
| ‒ | 1X | / | ‒ | * |
Technical data
General
| Component series | 1X | |
| Type of electronics | Analog | |
| Design | Euro-card |
Voltage supply
| Operating voltage | with integrated voltage regulator | U | V | ± 24 | |
| Upper limit value | U | V | ± 28 | ||
| Lower limit value | U | V | ± 22 | ||
| without integrated voltage regulator | U | V | ±24; ±15.0 | ||
| Upper limit value | U | V | ±28; ±15.2 | ||
| Lower limit value | U | V | ±22, ±14.8 | ||
| Current consumption | max. | Imax | A | 0.15 | |
Analog inputs
| Command value | Voltage | grounded on one side, first input 1) | Ucommand | V | 0 … ±10 |
| grounded on one side, second input 2) | Ucommand | V | 0 … ±10 | ||
| position value 1) | Voltage | U | V | 0 … ±10 | |
| 1) | RE = 50 kΩ |
| 2) | RE = 50 kΩ, J9 gesteckt |
Digital inputs
| Enable 1) | On (active) | U | V | +24 (with J13); 0 (with J12) |
| Controller change-over 1) | U | V | +24 (with J13); 0 (with J12) | |
| Backup relay 1) | U | V | +24 (with J13); 0 (with J12) | |
| 1) | RE = 700 Ω (relay) |
Analog outputs
| Valve flow command value | Voltage | UO | ±10 V ≙ ±60 mA (J10 plugged, port 28a) |
Solenoid outputs
| Solenoid current | max. | Imax | mA | 60 |
| Dither signal | f | Hz | 340 ±5 % (Ipp = 3 mA) | |
Position transducer
| Oscillator frequency | f | kHz | 5 |
Other information
| Relay | Pickup voltage | U | +24 (UB) | |
| Nominal voltage | U | V | 26 | |
| Response voltage | U | V | 13 | |
| Step-back voltage | U | V | 1.3 ... 6.5 | |
| Switching time | t | ms | 4 | |
| Coil resistance at 25 °C | R | Ω | 700 | |
| Contact load | I | A | 0.5 | |
| Reference voltage | Potentiometer supply | U | V | ±15 ±2 % (Imax = 150 mA) |
| Anschlussart | 32-pole male multipoint connector, DIN 41612, design D | |||
| Ambient temperature range | ϑ | °C | 0 … 50 | |
| Storage temperature range | ϑ | °C | -20 … 70 | |
| Weight | m | kg | 0.3 | |
(For applications outside these values, please consult us!)
Symbols/Circuit diagrams
Dimensions
Project planning information
The amplifier card may only be unplugged and plugged when de-energized.
Command values may only be switched via relays with gold-plated contacts (low voltage, low currents).
Card relays may only be switched (enable, controller change-over, reserve) using contacts with a load capacity of approx. 40 V; 50 mA.
Always shield command and actual value cables; connect shielding to ground (⊥) on the card-side, open at one side.
Do not lay signal lines close to power lines.
Recommendation:
Also shield the solenoid conductors (to ⊥ on one side).
Up to a length of 50 m, use cable type LiYCY 1.5 mm2, for longer lengths please ask.
Notice:
The K2 relay may only be de-activated if the servo valve is trimmed so that main stage of the WRC valve moves the actuator into a secure end position.
With non-trimmed servo valves, the position of the control spool in the main stage is not defined when relay K2 is off.
Ordering codes
Downloads
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