Артикул: RX7113
Valve amplifier for adjusting the flow of axial piston pumps VT 5035-1X
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Description
- Component series 1X
- Analog, Euro-card format
- For flow adjustment of the variable displacement axial piston pumps A4VSO and A4VSG
Features
- Differential input for voltage
- Four callable command value inputs, input for ramp time
- Controller for the pump swivel angle
- Controlled output stages
- Oscillator/demodulator for inductive position feedback
- Reverse polarity protection for the operating voltage
- Enable input
Product description
The printed circuit board is used for the electric flow control of an AV4VSO and AV4SG with EO1 and EO2 adjustment or an AVCSG with EO2 adjustment.
The amplifier controls the proportional valve of the swivel angle actuating cylinder and controls its position analogously to the specified command value. The swivel angle position is recorded as actual value.
Using the command value inputs 1 to 4, command values can be retrieved [1] by actuating the related relays (K1 to K4). The command value voltage is either specified directly, by the regulated voltages ±9 V of the internal power supply unit [10] or via an external command value potentiometer. For these inputs, ±9 V ≙ 100 %. Reference potential for command values 1 to 4 is M0. If these four command value inputs are directly connected to the regulated voltages ±9 V, four different command values can be set at the "w1" to "w4" potentiometers. When external command value potentiometers are used at these inputs, the internal potentiometers function as attenuators or limiters unless they have been set to the maximum.
The LEDs "H1" to "H4" indicate which command value is just being called. If more than one command value is called at a time, the input with the highest number will take priority.
Example: If command value 1 and command value 3 are activated simultaneously, command value 3 will take effect.
Another output of the card supplies a supply voltage for the command value call-ups which can be switched from +9 V to –9 V by means of the relay K6).
All relays on the card are switched with 24 VDC (smoothened).
The command value input 5 is a differential input (0 to ±10 V). If the command value is specified by external electronics with a different reference potential, this input has to be used. When disconnecting or connecting the command value voltage, it has to be ensured that both signal lines are in each case separated from or connected with the input.
Before they are forwarded, all command values will be added up according to their absolute value and their sign [3].
The down-stream ramp generator [4] generates a ramp-shaped output signal from a given step-shaped input signal. The time constant of the output signal can be adjusted using the "t" potentiometer. The specified ramp time refers to a command value step of 100 % and may be approx. 1 s or 5 s depending on the jumper setting (J5, J6). If a command value step of less than 100 % is switched to the ramp generator input, the ramp time will be correspondingly shorter.
Notice:
When using an external time potentiometer, the internal potentiometer for the ramp time must be set to maximum. The maximum ramp time is reduced as the resistance value of the external potentiometer is switched in parallel to that of the internal one (ca. 500 kΩ).
By switching the relay K5 or by an external jumper, the ramp time is set to its minimum value (ca. 30 ms).
The output signal of the ramp generator [4] is the swivel angle command value and is supplied to the PID controller [5], the "w" measuring socket on the front plate of the card and port 4a (command value after ramp/external limiting potential). A voltage of –6 V at command value measuring socket "w" corresponds to a command value of +100 %.
The PID controller has been especially optimized for the specified pump types. The current output stages are controlled depending on the difference between swivel angle command value and actual swivel angle value. A positive command value signal at the amplifier input actuates the output stage for solenoid "a", a negative command value signal the output stage for solenoid "b".
The inductive position transducer [11] detects the actual swivel angle value. The AC voltage signal of the position transducer is converted in the oscillator/demodulator [9] and returned to the PID controller as actual swivel angle value.
The zero point of the position transducer (actual value zero point) can
be adjusted by means of the "Zx" potentiometer (on the printed circuit board). The amplification of the actual swivel angle value has been calibrated at the factory and must not be changed (±6 V ≙ max. swivel angle position)
With a signal of > 8.5 V at the enable input, the output stages are enabled (indication by the yellow "H11" LED on the front plate). By setting jumper J7, the output stages are permanently enabled irrespective of the enable input status. The enable input will then be ineffective.
In case of fault-free operation, the "H12" LED (ready for operation) is illuminated; in detail if:
the enable signal is applied,
the internal ±9 V voltage supply functions (amplitude and symmetry),
no short-circuit of the solenoid conductors and
no cable break in position transducer lines.
In case of fault, the two output stages are immediately de-energized, the controller is switched off and the "Ready for operation" message is reset. After correction of the fault, the card is immediately functional again; the "H12" LED lights up again.
[ ] = Assignment to the block diagram
Type code
| 01 | Valve amplifier for flow control of the axial piston variable displacement pumps A4VSO and A4VSG with EO1 or EO2 adjustment or A4CSG with EO2 adjustment | VT 5035
|
| 02 | Component series 10 ... 19 (10 ... 19: unchanged installation and connection dimensions) | 1X |
| 03 | Further details in the plain text | * |
| 01 | 02 | 03 | ||
| VT 5035
| ‒ | 1X | / | *
|
Technical data
General
| Component series | 1X | |
| Type of electronics | Analog | |
| Design | Euro-card |
Voltage supply
| Operating voltage | Nominal | U | V | 24 |
| Lower limit value | UB(t)min | V | 22 | |
| Upper limit value | UB(t)max | V | 35 | |
| Power consumption | max. | Smax | VA | 50 |
| Current consumption | max. | Imax | A | 2 |
| Fuse | 2.5 A time-lag | |||
Analog inputs
| Command value | Voltage (differential input) | U | V | 0 ... ±10 | |
| Voltage 1) | Potentiometer input 1-4 | U | V | 0 … ±9 | |
| 1) | Reference potential is M0 |
Digital inputs
| Enable | On (active) | U | V | 8.5 ... UB |
| Off (inactive) | U | V | 0 ... 6.5 |
Solenoid outputs
| Solenoid current | max. | Imax | A | 1.8 |
| Coil resistance at 20°C | R | Ω | 5.4 | |
| Clock frequency (freely clocking) | f | kHz | 1.5 | |
Position transducer
| Oscillator voltage | U | V | 5 (Imax = 30 mA) |
| Oscillator frequency | f | kHz | 2.5 ±10 % |
Adjustment options
| Ramp time up/down | Ramp 1 | t | s | 0.03 … 1 |
| Ramp 2 | t | s | 0.03 … 5 |
Measuring sockets
| Command value | "w" | Uw | V | 0 ... ±6 |
| Actual value 1) | "x" | Ux | V | 0 ... ±6 |
| 1) | +6 V ≙ +100 %, -6 V ≙ -100 %, Ri = 100 Ω |
Displays
| LED display | Green 1 | Ready for operation | |
| Yellow 1 | Enable |
Other information
| Relay | Nominal voltage | U | V | 24 |
| Response voltage | U | V | 16.8 | |
| Step-back voltage | U | V | 2.4 | |
| Coil resistance at 25 °C | R | Ω | 2150 | |
| Reference voltage | Potentiometer supply | U | V | ±9 (Imax = 25 mA) |
| Anschlussart | 32-pole male multipoint connector, DIN 41612, design D | |||
| Ambient temperature range | ϑ | °C | 0 … 50 | |
| Storage temperature range | ϑ | °C | -25 … 85 | |
| Weight | m | kg | 0.15 | |
(For applications outside these values, please consult us!)
Operating and display elements
LED displays
| Enable (yellow) | |
| Ready for operation (green) | |
| H1 … H4
| Command value call-ups |
| H10 | Cable break |
Potentiometer
| w1 … w4 | Command value attenuator |
| t | Ramp time |
| Zx | Zero point actual value |
| Gx | Attenuators for actual swivel angle value (calibrated at the factory) |
Measuring sockets
| w | Command value |
| x | Actual value |
| ⊥ | Reference potential |
Meaning of jumpers
(Plate on the back side of the front plate)
The circles ( ◯) serve for marking of settings made by the customer.
The condition as supplied is marked with "•".
Symbols/Circuit diagrams
| H1 … H4
| LED display for command value call-up |
| K1 … K6
| Call-up relay |
| w1 … w4
| Command value potentiometer |
| t | Ramp time |
| 1 | Command value |
| 2 | Differential amplifier |
| 3 | Summing device |
| 4 | Ramp generator |
| 5 | Controller for the pump swivel angle |
| 6 | Current controller |
| 7 | Output stage |
| 8 | Monitoring |
| 9 | Oscillator/demodulator |
| 10 | Power supply unit |
| 11 | Position transducer |
| 12 | Actual value identification |
| 13 | Proportional valve |
| Position transducer connection | |
| 1 | For pump with clockwise rotation |
| ( )
| For pump with counter clockwise rotation |
Dimensions
Dimensions in mm
Dimensions in mm
Project planning information
- The amplifier card may only be unplugged and plugged when de-energized.
- No connectors with free-wheeling diodes or LED displays must be used for solenoid connection.
- Only carry out measurements at the card using instruments Ri > 100 kΩ.
- Measurement zero (M0) is increased by +9 V compared to 0 V operating voltage and not isolated, i.e. –9 V regulated voltage 0 V operating voltage. Thus, do not connect measurement zero (M0) to 0 V operating voltage.
- For switching command values, relays with gold-plated contacts have to be used (low voltages, low currents).
- Card relays may only be switched using switching contacts with a load capacity of approx. 40 V; 50 mA.
- In case of external control, the residual ripple of the control voltage may maximally be 10 %.
- Always shield command value lines and lines of the inductive position transducer separately; connect shielding to 0 V operating voltage on the card-side, other side open (risk of ground loops)!
- Recommendation:
Also shield solenoid conductors.
For solenoid conductors up to a length of 50 m, use cable type LiYCY 1.5 mm2. For greater lengths, please contact us.
- The distance to aerial lines, radios, and radar systems has to be at least 1 m.
- Do not lay solenoid conductors and signal lines near power lines.
- Due to the charging power of the smoothing capacitor on the card, time-lag characteristics are required at the pre-fuses.
- Do not connect the port of the inductive position transducer marked with the ground sign with the ground. (Requirement for compatibility with previous component series.)
- If the differential input is used, both inputs must always be connected or disconnected at the same time.
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