Rexroth VT-VPCD-1-16/V0/1-P-1 R901089559 Amplifier board

Rexroth VT‑VPCD‑1‑1X/V0/1‑P‑1 (R901089559) is a digital control amplifier board dedicated to axial piston variable pumps, developed by Bosch Rexroth. It is designed for the A4VS…HS4 series pumps (equipped with the swashplate inclination sensor AWX F004 D01). The unit integrates closed-loop swashplate inclination control, closed-loop pressure control, power limiting, valve position control, master/slave / mooring control, bus communication and diagnostic functions. Adopting the Eurocard standard structure, it delivers high-precision electro-hydraulic control and is widely used in high-pressure, high-flow pump control systems such as industrial hydraulics, mobile machinery and test benches.

1. Model Code and Material Number Interpretation

• VT‑VPCD: Digital control electronics for axial piston variable pumps
• 1: Basic version
• 1X: Component series (fixed mounting / connection dimensions)
• V0: Suitable for A4VS…HS4 pumps + inclination sensor AWX F004 D01
• 1: With local display
• P: Integrated PROFIBUS DPV0 bus
• 1: With valve drive power output stage

2. Core Functions and Control Architecture

• Closed-Loop Control: Swashplate inclination control, pressure control (with subordinate inclination loop), programmable power limiting
• Signal Processing: Demodulation for two inductive measurement channels (valve position / pump inclination), analog setpoint / feedback acquisition
• Drive Output: Clock-type flow control output stage, direct drive for 4WRE6 proportional valves
• Control Logic: Minimum selector ensures priority action of the controller corresponding to the operating point
• Advanced Functions: Master/slave synchronization, mooring mode, leakage compensation, parameter set recall, oscilloscope function, diagnostic display

3. Hardware Structure and Interfaces

• Board Format: Eurocard 100×160mm, double-sided SMT, front panel with LEDs and display
• Power Supply: 24VDC (21–30V), maximum power consumption 3.5A
• Connectors: 64-pin DIN 41612 male connector, front-panel D-Sub 9-pin (RS232)
• Communication: RS232, PROFIBUS DPV0, local bus (networking for up to 32 units)
• Display and Measurement: LED status indication, local LCD, two configurable measurement sockets (X1/X2)

4. Input / Output Specifications

Digital I/O

• Inputs: 4 binary parameter set recall channels, enable, command valid, slave mode (active high 16V–UB)
• Outputs: Control status, general fault output, window comparison, 32Hz square wave, etc., max. 30mA per channel, short-circuit protected

Analog I/O

• Inputs: Configurable as ±10V / 0–10V / 4–20mA for inclination / pressure / power setpoints and feedback
• Outputs: ±10V for valve control, master/slave setpoint, test output, minimum load 1kΩ
• Reference: ±10V reference, max. 30mA, ripple < 20mV

Sensor Interfaces

• Valve Position / Pump Inclination: Inductive type, carrier frequency approx. 5kHz, dedicated excitation and sampling channels

• Pressure: Supports single-channel (open-loop) / dual-channel (closed-loop) current / voltage type sensors

• 

5. Key Electrical and Performance Parameters

6. Compatible Systems and Components

• Matched Pump Type: A4VS…HS4 axial piston variable pumps
• Matching Valve: 4WRE6‑2X/822 proportional valve
• Pressure Sensor: Recommended HM20‑2X
• Inclination Sensor: AWX F004 D01
• Mounting Racks: 19-inch VT 19101/102/103/110, VT 3002‑2X/64G, etc.

7. Commissioning, Software and Accessories

• Commissioning Software: BODAC (SYS‑HACD‑BODAC‑01, R900777335)
• Communication Cable: VT‑HACD‑1X/03.0/HACD‑PC (R900776897)
• PC Environment: Windows XP/Vista/7, ≥256MB RAM, ≥250MB hard disk space
• Functions: Pump specification selection, parameter tuning, I/O configuration, bus address setting, diagnostic monitoring, data logging

8. Typical Application Scenarios

• Industrial Hydraulics: Injection molding machines, die-casting machines, forging presses, metallurgical equipment
• Mobile Machinery: Construction machinery, marine deck machinery, test benches
• High-Pressure Systems: High-precision flow / pressure / power coordinated control for high-flow variable pumps

9. Installation and Maintenance Notes

• Board insertion and removal must be performed with power disconnected
• Input impedance of measuring instruments > 100kΩ
• Command / feedback cables shall be shielded and single-ended grounded
• Keep away from high-voltage and radio-frequency sources with a distance ≥1m
• Gold-plated contact relays are recommended for analog switching

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