REXRTOH VT-HPC Digital Pump Control

Digital output (4 channels): Short circuit protection, maximum load capacity of 50mA. A key feature is that all digital outputs can be used as power pins for sensors, greatly simplifying external sensor power supply wiring.

Analog input (5-way universal+1-way dedicated swing angle sensor):

Universal input (Ai1-Ai5): can be parameterized as ± 10V voltage input or 4-20mA current input, with a resolution of 14 bits.

Dedicated swing angle sensor input (Ai_Sv): separate pin, 13 bit resolution.

Analog output (2 channels): can be independently parameterized as ± 10V voltage output or 0/4-20mA current output, with a resolution of up to 16 bits, used for outputting actual values or as a command source for other devices.

Sensor power supply: Provides UB-3V voltage for the swing angle sensor, with a maximum supply current of 60mA.

4. Valve drive output: The maximum electromagnetic current can reach 2.7A, which can directly drive high flow proportional valves.

5. Network and Communication Interface:

XF20/XF21: Two Ethernet ports with integrated switch functionality. Used for parameter settings, firmware updates, PLC programming, and as a real-time Ethernet slave interface.

XF30: (limited to models with "P") PROFIBUS DP interface, supporting a maximum speed of 12MBaud.

Software Functionality and Engineering Ecology: A Complete Toolchain from Configuration to Programming

The power of VT-HPC cannot be separated from the software ecosystem behind it.

1. Engineering software: IndraWorks

This is the core toolkit for configuring, parameterizing, and debugging VT-HPC.

IndraWorks DS: Used for equipment planning, parameter setting, debugging, and diagnosis. Its graphical interface allows users to easily configure controller parameters, select working modes, set monitoring thresholds, and more.

IndraWorks MLD: To use the built-in PLC function of VT-HPC (activated by inserting a dedicated SD card), this programming environment is required for logic and motion control programming that complies with the IEC 61131-3 standard.

2. Core control and advanced functions:

Basic control modes: pressure control, displacement angle/flow control.

Torque limitation: effectively protects the pump and prime mover, achieving constant power control.

Variable frequency speed regulation function (optional): Combined with a frequency converter, it achieves pump speed regulation, further optimizing energy efficiency, and is suitable for occasions with large changes in flow demand.

Master/Slave Control and Dragging Function: Suitable for complex hydraulic systems with multiple pumps in parallel or requiring passive following.

3. Data storage and maintenance:

The device is equipped with an SD card slot that supports up to 4GB of FAT32 format SD/SDHC cards. This card can be used for:

Save all device parameters and user data.

Store and run optional PLC programs.

Update firmware for advanced features such as variable frequency speed regulation. Rexroth recommends using its original memory card to ensure compatibility and reliability.

Installation, wiring points and LED diagnosis

To ensure stable operation of VT-HPC in harsh industrial environments, key design principles must be followed:

EMC measures: In sensitive environments, additional shielding, filtering, and other measures need to be taken.

Wiring separation: Signal lines and power lines must be laid separately as much as possible to avoid parallel wiring and reduce interference.

Shielding layer grounding: The shielding layer of all signal cables should be grounded at both ends.

Cable length limit: It is recommended that digital I/O cables should not exceed 30 meters, sensor cables should not exceed 50 meters, and valve wires should not exceed 30 meters.

Heat dissipation: The ventilation ducts above and below the device must not be obstructed to ensure sufficient heat dissipation.

The multi-color LED indicator lights on the front panel of VT-HPC are a powerful tool for rapid diagnosis:

Module Status (MS): Indicates the status of power on initialization, ready to run, activation, warning, error, etc. through different flashing combinations of red, green, and orange.

Network Status (NS): Indicates the status of the network connection.

SD card status (SD): Indicates whether the SD card exists and is ready.

Digital I/O status: directly displays the logical status of each input/output point.

Application value and industry significance

The emergence of VT-HPC digital control electronic devices has brought fundamental changes to hydraulic system design:

Simplify system architecture: It integrates previously dispersed proportional amplifiers, controllers, I/O modules, and communication gateways into a compact unit, significantly reducing cabinet space and wiring costs.

Improving performance and energy efficiency: Digital closed-loop control provides higher accuracy and dynamic performance than analog control. The integrated torque limitation and optional variable frequency function achieve energy saving of the hydraulic system from the source.

Realize intelligent and predictive maintenance: Rich status information and diagnostic data can be uploaded in real-time to higher-level monitoring systems (SCADA/MES) through the bus, providing a data foundation for predictive maintenance and process optimization.