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- Key Technical Specifications
| Parameter | Specification |
| Model Number | VT5007-17 (VT 5007 S17) |
| Manufacturer | Bosch Rexroth AG |
| Supply Voltage | 24 VDC (+20% / -10%) nominal |
| Power Consumption | ~50 VA (max operating load) |
| Command Inputs | Differential input \pm 10V (or 0 to 10V / 4 to 20mA) |
| Output Current | Pulsed PWM solenoid drive up to 2.7 A |
| Valve Compatibility | Proportional directional valves with LVDT spool position feedback |
| Form Factor | 3U Eurocard (32-pin / 48-pin DIN 41612 edge connector) |
| Operating Temperature | 0°C to +50°C (32°F to 122°F) |
| Weight | ~0.35 kg (0.77 lbs) |
- Product Introduction
The Bosch Rexroth VT5007-17 is an analog proportional valve amplifier card engineered for precision hydraulic control loops. Mounted on a standard Eurocard circuit board, it controls proportional directional and throttle valves equipped with inductive spool position transducers (LVDTs).
The VT5007-17 features an onboard command value generator, adjustable ramp time potentiometers, a differential amplifier for noise immunity, an LVDT oscillator/demodulator circuit, and a closed-loop spool position controller. By comparing the command signal against real-time valve position feedback, the card regulates solenoid current via high-efficiency pulse-width modulation (PWM), enabling highly accurate flow and directional control in hydraulic presses, injection molding machines, and heavy steel mill equipment.
- Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
| Valve non-responsive / “UB” LED dark | 24 VDC operating power missing or internal card fuse blown | ✅ High | Measure 24 VDC between card supply pins on rack socket | Check main power supply. Verify supply polarity and replace blown card fuse if present. |
| Spool position error / “PE” fault LED lit | Open circuit in LVDT feedback wiring or spool mechanically jammed | ✅ High | Measure resistance across LVDT feedback pins on card edge connector | Inspect LVDT cable shielding and coil resistance. Verify mechanical freedom of valve spool. |
| Unstable hydraulic motion / Oscillations | Incorrect PID gain adjustment or improper LVDT zero calibration | ✅ High | Observe spool position test point (“v”) with an oscilloscope | Adjust front-panel zero and gain potentiometers according to Rexroth tuning specifications. |
| Solenoid overheating / Excessive current | Solenoid short-circuit or incorrect current limit setting | ✅ High | Measure coil resistance of the proportional solenoid (typically 2.5–5 Ω) | Replace damaged valve solenoid coil. Verify jumper settings for max output current on VT5007-17. |
VT5007-17
VT5007-17
- Frequently Asked Questions (FAQ)
Q: What type of valves does the Rexroth VT5007-17 amplifier control?
A: The VT5007-17 is specifically designed to control Rexroth proportional directional valves that utilize electrical spool position feedback (LVDT transducers), such as 4WRE or 4WRZ series valves.
Qhe card still actively manufactured by Bosch Rexroth?
A: No. The VT5000 analog amplifier series has reached legacy/discontinued status. Repnt cards are available through certified surplus stock, refurbished units, or modern digital card migrations (e.g., VT-VRPA series).
Q: Can the ramp speed be adjusted directlhe card?
A: Yes. The card features front-panel potentiometers allowing independent adjustment of acceleration and deceleration ramp times for smooth hydraulic actuator transitions.
Q: What is the primary difference between series cards and standard VT3000 cards?
A: cards incorporate onboard LVDT demodulator and closed-loop position feedback control circuits, whereas basic VT3000 cards typically operate in open-loop current control mode without spool position feedback.
Q: How are surplus or refed modules verified before shipment?
A: Each module passes a 5-step SOP quality inspection: edge connector pin inspection, installation into a Eurocard test rack, closed-loop simulation using an active LVDT and dummy solenoid load, 4-hour burn-in under rated current, and ESD anti-static packaging before dispatch.
