Product Core Brief
- Model: SE311, OEM part number 0 608 830 237, document ref 3 609 929 983
- Brand: REXROTH (Bosch Rexroth Tightening System 300 series)
- Series: SE3xx tightening control Eurocard family
- Core Function: Execute closed-loop torque and angle tightening sequences, process spindle encoder feedback, and exchange trigger/fault signals with cabinet PLC and LT304 spindle power stages to form a complete screw fastening axis channel.
- Product Type: 5 TE / 6 HE vertical Eurocard rack module for BT300 card rack or SB301/SB305 system boxes
- Key Specs: 8×24 V digital inputs | 4×0.5 A digital outputs | Non-volatile tightening recipe memory | ±10 V analog torque setpoint output | Condition: Refurbished Bench-Tested Surplus
- Unit note: This is a logic control card only; it requires a separate LT304 power pack to drive EC tightening spindles, it cannot operate standalone.
Product Introduction
The REXROTH is the primary sequence logic card for single tightening channels within Tightening System 300, pairing with LT304 EC spindle power packs and VM310 auxiliary power supplies on assembly and semiconductor fastening lines. It stores up to 64 unique torque-angle tightening programs without external memory media.This unit differentiates from older SE301 cards by expanding digital I/O count and adding real-time torque deviation fault detection. OEM field data lists its rated MTBF at 43,000 operating hours under 24/7 cyclic fastening loading at 45 °C cabinet ambient, aided by passive convection cooling within the BT300 rack housing.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Rack form factor | 5 TE width × 6 HE height Eurocard for BT300 card rack |
| Overall module dimensions | 25.55 mm W × 271 mm H × 285 mm D |
| Net unit weight | 1.4 kg |
| Cabinet supply voltage | 24 V DC (19.2–28.8 V tolerance), 0.4 A steady draw |
| Onboard digital I/O | 8 sink-type 24 V digital inputs; 4 short-circuit protected digital outputs (max 0.5 A each) |
| Analog control output | Differential ±10 V torque setpoint signal to LT304 spindle drive |
| Encoder feedback interface | Differential incremental spindle position/torque transducer input |
| Recipe storage capacity | 64 independent torque-angle tightening parameter sets (non-volatile flash) |
| Environmental protection rating | IP20 when fully inserted into BT300 rack housing |
| Continuous operating ambient temp | 0 °C to +55 °C with cabinet forced airflow; linear performance derate above +55 °C |
| Storage / transport temperature | -20 °C to +70 °C, non-condensing 20–95 % RH |
| Integrated diagnostic logic | Torque deviation monitoring, spindle stall detection, cable break fault flagging |
| Compliance certifications | CE, UL, EN61000 Class A EMC filtering, SEMI S2 cleanroom assembly equipment qualified |
Quality Control Process (Engineer’s Perspective)
- Incoming Verification: Cross-reference serial number against Rexroth OEM 0608830237 part database; inspect front panel status LEDs for dead pixels, 64-pin backplane edge connector for bent pins, and terminal block screw lugs for corrosion. Photograph backplane I/O pin layout for field rack wiring reference.
- Live Functional Test: Insert into BT300 test rack paired with LT304 spindle simulator and VM310 auxiliary power supply; run 24 hour cyclic tightening sequence profiles across all stored recipe memory slots. Use a Fluke 115 signal logger to track ±10 V analog setpoint linearity and digital I/O toggle timing consistency.
- Electrical Parameter Test: 500 V Megger insulation test between 24 V I/O circuits and rack chassis ground (pass threshold >10 MΩ); verify digital output short-circuit protection triggers at 0.6 A without permanent latch failure.
- Recipe & Fault Logic Verification: Write and read back all 64 tightening recipe parameter sets to validate flash memory retention; simulate spindle encoder cable breaks and torque overshoot events to confirm correct fault flagging on digital output terminals.
- Final QC & Packaging: Clean oxidation from backplane edge connector contacts during refurbishment cycles; seal module in anti-static PE foam bag, apply dated QC Pass label listing analog output linearity, recipe memory retention, and fault detection trigger test metrics before rigid carton shipping.
Replacement Pitfall Guide
❗ Older SE301 control cards hold only 16 tightening recipes and carry fewer digital I/O channels. Direct substitution without program migration will erase production fastening parameters and break machine trigger interlock logic. Export all active torque recipes before removing the original rack card.❗ Backplane Edge Connector Partial Seating Hazard: Uneven insertion into the rack creates high-resistance contact points for analog torque setpoint signals. Poor seating generates unstable spindle speed oscillation and inconsistent fastening torque results mid-batch. Tighten front panel mounting screws evenly to lock the card fully into the rack slot.❗ Analog Signal Cable Cross-Talk Interference Risk: Unshielded ±10 V setpoint wiring run parallel to high-current motor power cables introduces torque signal noise and fastening scatter. Separate low-level analog harnesses from spindle power looms by a minimum 50 mm inside cabinet cable trays.❗ Cabinet Condensation Short-Circuit Risk: Cold-stored modules moved into warm humid assembly cabinets form PCB condensation within two hours. Allow a minimum four-hour temperature acclimation period before applying 24 V DC rack supply to prevent trace corrosion and flash memory corruption.❗ ESD Flash Memory Circuit Damage: Onboard recipe storage flash ICs have low electrostatic discharge tolerance. Always rest the unit on a grounded anti-static mat during rack insertion or terminal block rewiring, especially in low-humidity cleanroom production environments.Keep these in mind and you’ll cut 90% of rework time.
Compatibility Matrix & Benchmarks
Compatibility Matrix
- SE301 legacy tightening control card → : Needs Adaptation — rework machine interlock logic for expanded 8DI/4DO I/O, migrate all fastening recipes to expanded 64-slot memory bank
- EC spindle power pack → : Direct — native differential ±10 V analog torque setpoint signal natively drives the spindle drive without external signal conditioning
- VM310 cabinet multi-channel auxiliary power supply → : Direct — regulated 24 V DC auxiliary output matches module rack supply requirements
- CML40.2-SP-330-NA-NNNN-NW SERCOS motion PLC → : Needs Adaptation — add digital trigger I/O wiring between CPU discrete terminals and input channels for coordinated multi-axis + tightening sequences
