Product Core Brief

• Model: VT-/V0/1-P-1, datasheet ref RE 30028
• Brand: Bosch Rexroth
• Series: VT-VPCD digital closed-loop pump control electronics family
• Core Function: Digital microcontroller-based amplifier for A4VS variable displacement axial piston pumps with HS4 electro-hydraulic control; executes dual closed-loop swivel angle + pressure control, converts PLC/motion controller analog setpoints to regulated proportional drive current for pump swashplate actuator, monitors pump pressure and swivel position feedback, outputs fault relay signals to machine logicManualsLib
• Product Type: Standard Euro card 3HE rack plug-in module, suffix breakdown definition:
  • 1: Single pump control channel
  • 15: Max 1.5A proportional drive output current for HS4 pump solenoid
  • V0: Standard base firmware without extended sequence control functions
  • 1: Base hardware revision
  • P: Equipped with potential-free fault/status relay output terminal block
• Key Specs: 1.5A proportional valve drive output | Dual closed-loop (swivel angle + pressure) | ±10V / 4–20mA analog setpoint input | RS232 service port for BODAC software | Flash parameter storage | Potential-free fault relay contacts | 24VDC rack supply
• Note: OEM standard active production; factory-new calibrated surplus and fully bench-tested refurbished inventory available. Exclusively matched to A4VS HS4 variable pumps, compatible with PPC-R22 RECO rack motion control systems for hydraulic press and semiconductor substrate forming equipment; cannot interchange with C/D suffix variants without cabinet wiring reworkManualsLib

 

Key Technical Specifications

Mechanical & Form Factor

• Standard Euro card DIN 41494: 3HE height (128.4mm), 7TE width (35.56mm), depth 160mm
• Backplane connector: 64-pin DIN41612 type G multipoint edge connector
• Front panel: Digital LED status indicators, numeric diagnostic display, 9-pin RS232 D-Sub service port, four operation/parameter adjustment pushbuttons
• Unit weight: 0.2 kg

Power Supply

• Nominal supply voltage: 24 VDC (range 18–30 VDC unregulated cabinet rail)
• Max total current consumption: 3.5 A steady full load
• Internal reference output: ±10 VDC, max 30 mA for external transducer excitation

Analog Signal Interfaces

1. Command setpoint inputs (AI): ±10 V voltage or 4–20 mA current configurable, input resistance 100 Ω for current signals, 12-bit resolution, scan cycle 2 ms
2. Feedback inputs: Swivel angle LVDT inductive sensor, system pressure 4–20 mA transducer
3. Proportional drive output (AO): Max 1.5 A continuous regulated drive for HS4 pump control solenoid, low residual ripple <20 mV, integrated dither to eliminate stick-slip pump response
4. Aux analog outputs: 3× ±10 V monitor channels for pressure/swivel angle trending to DAQ hardware

Communication & Diagnosis

• Serial interface: Front RS232 9-pin D-Sub, commissioning via Rexroth BODAC PC software for pump parameter tuning, leakage compensation, ramp limit configuration
• Non-volatile storage: Flash memory retains pump size, PID loop gains, fault thresholds after full power loss
• P-suffix relay output: Potential-free SPDT fault/status relay for pump overload, swivel sensor break, low pressure alarm interlock to PPC-R22 motion CPU digital I/O
• Fault detection logic: Cable break detection for all transducers, pump overpressure, swivel angle deviation, power supply undervoltage, overcurrent drive stage shutdown with numeric fault code display on front panel

Control Modes

• Independent closed-loop pressure control
• Swivel angle (flow) closed-loop control
• Combined pressure/flow priority dual loop with cross-limiting for forming press cycle profiling
• Built-in leakage oil compensation for long-run precision stability

Environmental & Compliance

• Continuous operating ambient: 0°C ~ +50°C cabinet runtime; linear performance derate above 45°C
• Storage temperature: -20°C ~ +70°C, non-condensing humidity 5–95% RH
• EMC: EN61000 industrial noise immunity, CE certified
• Application compliance: SEMI S2 for cleanroom wafer forming hydraulic equipment
• Compatible pump hardware: A4VS series axial piston pumps with HS4 electro-hydraulic control unit

 

Product Introduction

This rack-mounted digital pump controller forms the core hydraulic regulation unit for variable displacement A4VS pumps deployed on precision hydraulic presses and semiconductor substrate forming machines paired with Rexroth PPC-R22 multi-axis motion CPUs.The dual nested PID control loops simultaneously regulate pump delivery flow (swivel angle) and system pressure without separate external signal conditioning hardware, while integrated leakage compensation maintains consistent forming force over extended production batches. The front RS232 service port enables offline pump parameter backup via BODAC software, and P-type relay fault outputs broadcast critical pump failure alarms directly to the machine motion controller without analog signal conversion. Digital microcontroller architecture eliminates analog amplifier drift common on older VT series analog pump cards, delivering repeatable micron-level clamping pressure accuracy for wafer processing cycles.

 

QA & Testing SOP (Transparency Building)

1. Incoming Inspection: Cross-reference serial number against Rexroth RE30028 OEM vital product databases; visual scan for cracked front panel pushbuttons, corroded RS232 D-Sub pins, swollen onboard electrolytic capacitors, bent 64-pin backplane edge connectors. All backplane wiring pin assignments photographed pre-disassembly.
2. Live Bench Testing: Insert card into standard Euro card test rack paired with A4VS pump signal simulator and Fluke process calibrator; run continuous 24-hour cyclic pressure/flow closed-loop profile matching production press forming cycles. Verify 1.5A proportional drive output linearity error <0.05% full scale across full pump control range.
3. Communication & Memory Validation: Establish BODAC PC link; upload/download complete pump PID parameter libraries to validate Flash memory read/write integrity, retain all calibration constants over 12-hour full power-off cycles to test non-volatile storage retention.
4. Fault & Relay Functional Trim: Simulate transducer open/short circuit, pump overpressure and drive overcurrent fault states to validate numeric fault code display and P-suffix relay contact state switching timing match OEM datasheet thresholds.
5. Final QC & Packaging: Replace degraded onboard electrolytic filter capacitors during refurbishment cycles; cap unused D-Sub port with OEM dust plug, wrap unit in static-dissipative foam, affix printed QC tag listing analog output linearity, closed-loop stability and fault relay test metrics before sealed anti-static bag packaging.

 

Installation Pitfalls & Guide (Engineer to Engineer)

❗ Suffix Variant Mismatch Risk: P-type relay output hardware cannot directly replace 0/C/D suffix VT-VPCD variants without full cabinet interlock wiring rework; non-P suffix cards lack dedicated fault relay terminals for pump safety interlock logic. Photograph original backplane fault signal wiring layout before card removal to avoid lost machine safety alarm reporting post-swap.❗ Analog Setpoint Wiring Cross-Talk Hazard: Running ±10V pump command cables parallel to high-current servo motor power lines creates RF noise-induced pressure oscillation during fast wafer forming cycles. Separate low-level analog signal looms from high-power cabling minimum 50mm per EMC cabinet wiring standards.❗ Backplane Edge Connector Partial Seating Risk: Uneven Euro card insertion creates high-resistance contact points on the 64-pin multipoint connector, triggering intermittent swivel angle sensor signal dropout and unstable pump flow regulation during production batches. Torque front panel mounting screws evenly to lock card fully into rack slot.❗ Cabinet Condensation Short-Circuit Risk: Cold-stored modules transferred into warm humid enclosures form internal PCB condensation within 2 hours. Allow minimum 4-hour temperature acclimation before applying 24VDC rack supply to prevent trace corrosion and permanent microcontroller lockup.❗ Catastrophic ESD Damage Risk: Unshielded analog input op-amps and Flash memory circuits sustain permanent leakage damage from ungrounded handling; certified ESD wrist strap and conductive anti-static mat mandatory before touching backplane edge connectors or front-panel D-Sub ports.

4-Step Replacement Guide

1. Pre-install: Execute full machine lockout-tagout, fully depressurize hydraulic pump manifold, power down Euro card rack 24VDC supply, export all pump PID gain, leakage compensation and pressure limit parameter sets via BODAC PC commissioning software.
2. Removal: Disconnect front service cable, record backplane terminal analog setpoint, transducer feedback and P-suffix fault relay wiring pin assignments; loosen front panel mounting screws evenly, slide Euro card straight out of rack slot and rest on vibration-dampened ESD foam pad.
3. Install: Align replacement VT-VPCD card parallel to empty Euro rack slot, insert evenly to fully seat 64-pin backplane edge connector, torque front mounting screws to OEM specified low torque value, re-terminate all analog, feedback and fault relay wiring matching photographed layout, segregate low-level analog signal cabling away from high-current power trunking.
4. Power-on Test: Restore rack 24VDC supply, confirm front panel power status LED illuminates steady green, connect BODAC PC via , upload saved pump parameter library, run 30-minute cyclic pressure/flow closed-loop forming test to validate stable pump regulation and reliable fault relay alarm triggering on simulated transducer failure conditions.

 

FAQ (Frequently Asked Questions)

Q: Can this P-relay VT-VPCD replace non-P suffix VT-VPCD pump control cards on identical hydraulic press racks without wiring rework?A: No out-of-box cross-compatibility. Non-P variants omit dedicated fault relay terminal pins for pump safety interlock logic; full machine interlock harness re-termination and safety logic HMI screen modification are mandatory after swap regardless of shared pump control firmware. All PID pump tuning parameters must be reloaded post-install.Q: Does this digital pump controller support hot-swapping while Euro card rack 24VDC supply and analog setpoint bus remain energized?A: The 64-pin backplane edge connector lacks staged hot-swap power pin sequencing. Live extraction injects voltage transients into analog transducer feedback circuits, corrupting Flash stored pump calibration parameters and risking permanent PPC-R22 motion CPU DAQ input hardware damage. Full rack DC power lockout and pump manifold depressurization is required before card disconnection.Q: What warranty separates factory surplus stock from fully refurbished VT-/V0/1-P-1 units?A: Unopened original Rexroth-certified surplus carries a 12-month industrial warranty covering analog output linearity drift, Flash memory corruption and fault relay contact wear. Refurbished calibrated units ship with a 6-month limited functional warranty; reused onboard electrolytic filter capacitors exhibit gradual capacitance loss under continuous cabinet heat, widening analog signal noise floor and triggering unstable pump pressure hunting during precision forming cycles.Q: Will swapping this pump control card erase stored pump pressure limit and leakage compensation tuning values?A: All pump PID loop gains, transducer scaling and leakage compensation constants reside in the unit’s onboard Flash non-volatile memory, independent of the PPC-R22 host motion controller. Export a complete pump parameter backup via BODAC software before disassembly to avoid full hydraulic loop retuning post-install.Q: Can this hardware operate with legacy BODAC v3 commissioning software released prior to 2008 without firmware updates?A: This V0 base hardware revision requires BODAC v4 minimum software version; v3 builds lack device description files for P-type fault relay status register mapping, leading to missing pump fault diagnostic trending screens on the VEP40 machine HMI.Q: What expected service window applies to surplus versus refurbished pump control cards in 24/7 high-volume semiconductor forming production environments?A: Original surplus units target scheduled onboard electrolytic capacitor replacement at 43,000 operating hours. Refurbished variants degrade at 34,000 hours; aged filter capacitors lose capacitance over time, increasing analog feedback signal ripple and triggering unplanned pressure deviation interlock trips during precision wafer clamping batches.Q: What functional difference separates P and 0 suffix variants of the same VT- base pump controller?A: This P suffix module integrates a dedicated potential-free SPDT fault/status relay output terminal block for machine safety interlock logic; 0 suffix base units omit relay hardware entirely, requiring external signal conditioning modules to convert pump fault codes to discrete digital inputs for the motion CPU.