The REXROTH VT 11030 is an analog electric amplifier module designed specifically for the control of proportional pressure valves. It acts as the interface between a control system (like a PLC) and a proportional solenoid, converting low-power voltage command signals into high-power current signals. This ensures precise, repeatable control of hydraulic pressure in industrial machinery.
Technical Specifications and Datasheet
-
Product Model: VT 11030
-
Operating Voltage: 24V DC (+10% / -5%)
-
Command Value Input: 0 to +10V (standard)
-
Output Current: Adjustable up to 2.5A (depending on the specific solenoid)
-
Step Function: Adjustable for overcoming mechanical friction (dead band)
-
Ramp Generator: Adjustable up and down ramps (0.02s to 5s)
-
Dimensions: 120mm x 20mm x 105mm (Card format)
-
Weight: 0.15 kg
-
Origin: Germany
Application Fields
This amplifier card is a staple in high-precision hydraulic control systems, including:
-
Plastic Injection Molding: Controlling the clamping and injection pressure phases for consistent part quality.
-
Metal Stamping Presses: Managing the force of hydraulic rams and cushions.
-
Machine Tools: Precise pressure regulation for tool clamping and workpiece holding.
-
Hydraulic Power Units (HPUs): General-purpose pressure control in centralized hydraulic systems.
-
Lumber & Paper Mills: Controlling the tension and pressure of heavy processing rollers.
User Instructions
-
Installation: The VT 11030 is typically a Euro-card format module. Insert it into a VT 3002 or VT 3000 rack/holder. Ensure the card is powered off during insertion to prevent arcing.
-
Wiring: Use shielded cables for the command value input (0-10V) to prevent electrical noise from causing pressure fluctuations. Connect the proportional solenoid to the output terminals as indicated on the rack wiring diagram.
-
Ramp Adjustment: Locate the “t >” and “t <” potentiometers on the front panel to adjust the acceleration and deceleration of the pressure change. Turning clockwise generally increases the ramp time.
-
Zero Point & Sensitivity: Adjust the “Zw” (Zero) potentiometer to ensure zero pressure at zero voltage, and the “Gw” (Gain) potentiometer to set the maximum pressure at 10V.
-
LED Monitoring: The front panel typically includes a green LED for “Power On” and a yellow LED for “Fault” or “Status.”
Q&A: Common Troubleshooting
Q: The solenoid is getting very hot even when no command signal is present. A: Check the “I-min” (minimum current) setting. If it is set too high, the module will constantly send current through the coil. Also, ensure the supply voltage is not exceeding 28V DC.
Q: Why is the hydraulic pressure “oscillating” or unstable? A: This is often caused by a lack of shielding on the command signal cable or incorrect gain settings. Try reducing the “Gain” (Gw) slightly or increasing the ramp time to stabilize the system response.
Q: Can I use this card with a 4-20mA signal? A: The standard VT 11030 is designed for a 0-10V input. To use 4-20mA, you would typically need a separate signal converter or a specific variant of the card that supports current inputs.
Similar Model Recommendations
For alternative hydraulic control solutions within the Rexroth ecosystem, consider:
-
REXROTH VT 11031: A similar amplifier often used for proportional directional valves rather than pressure valves.
-
REXROTH VT-VSPA1: A modern, compact replacement for older analog card-style amplifiers.
-
REXROTH VT 2000: A basic amplifier series for open-loop proportional valve control.
-
REXROTH VT-HNC100: A high-end digital controller for more complex closed-loop hydraulic positioning.
-
MOOG G122-824: A high-performance industrial buffer amplifier often used in similar hydraulic applications.
