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Key Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 029 366 817 |
| Input Voltage | 115/230 V AC (Auto-ranging) |
| Input Frequency | 47 – 63 Hz |
| Output Voltage | 24 V DC (Adjustable ±10%) |
| Rated Current | 5.0 A |
| Peak Current | 7.5 A (Short duration) |
| Ripple & Noise | < 100 mVpp |
| Efficiency | > 85% at full load |
| Operating Temp | -20°C to +60°C |
| Protection | Over-current, Over-voltage, Thermal shutdown |
| Mounting | 35mm DIN Rail or Panel Mount |
| Dimensions | Approx. 120 x 90 x 115 mm (H x W x D) |
Product Introduction
The Alstom SPU 232.2 (029 366 817) serves as the primary power conversion unit for legacy Microtech Distributed Control Systems (DCS). It accepts standard AC mains input and delivers a stable 24V DC rail required by processor cards and field I/O modules.This unit distinguishes itself through auto-ranging input capability, allowing deployment in both 115V and 230V regions without manual jumper changes. Field data indicates these units often run for 15+ years; however, electrolytic capacitor degradation is common. Our refurbishment process replaces aged capacitors, restoring ripple performance to under 80 mVpp (verified via oscilloscope).
Installation & Configuration Guide
Phase 1: Preparation (10 min)
- Verify main AC power is LOCKED OUT / TAGGED OUT.
- Check incoming voltage at the distribution panel (expect 115V or 230V AC).
- Inspect the DIN rail for corrosion or physical damage.
- Note: Ensure you have a multimeter set to DC Voltage ready.
Phase 2: Removal of Old Unit (5–10 min)
- Label all wiring connections before disconnecting. (Seriously, take a photo first).
- Loosen terminal screws and gently pull wires free.
- Release the locking clip at the bottom of the module.
- Tilt the unit outward and lift off the rail.
Phase 3: Installation (10 min)
- Hook the top of the SPU 232.2 onto the DIN rail.
- Push the bottom firmly until the locking clip clicks.
- Reconnect wires to corresponding terminals. Tighten to 0.5 Nm torque.
- Double-check polarity on the 24V DC output terminals.
Phase 4: Power-On & Test (10 min)
- Remove tools from the cabinet.
- Energize the AC input.
- Measure DC output immediately. Target: 24.0V ± 0.5V.
- Observe the “OK” LED. It should be solid green. If it blinks red, shut down immediately.
Troubleshooting Quick Reference
| Symptom | Probable Cause | Action |
|---|---|---|
| No Output Voltage | Blown input fuse or open AC line | Check AC input voltage; inspect internal fuse if accessible. |
| Output Voltage Low (<22V) | Overload or failing capacitor | Disconnect load; measure again. If still low, replace unit. |
| “OK” LED Blinking Red | Over-temperature or Over-current | Check ventilation; reduce load; verify fan operation. |
| High Ripple Noise | Aging filter capacitors | Replace unit. Do not attempt to repair capacitors onsite. |
| Intermittent Shutdown | Thermal protection trip | Clean air filters; ensure ambient temp < 60°C. |
Dimensions, Mounting & Wiring Notes
- Physical Size: Height 120mm × Width 90mm × Depth 115mm.
- Mounting: Standard 35mm DIN rail. Requires 15mm clearance on sides for airflow.
- Terminal Notes: Input terminals accept up to 4mm² (12 AWG) wire. Output terminals support 2.5mm² (14 AWG).
- Warning: Do not daisy-chain power inputs. Feed each SPU directly from the distribution block to prevent single-point failure.
FAQ
Q: Is the 029 366 817 compatible with newer GE Grid solutions?
A: Generally, yes, for backward compatibility in brownfield sites. However, pin-out configurations can vary slightly between revisions. Always compare the terminal diagram on the side label against your backplane before installing.Q: I need this for a critical process. Are your “Tested Surplus” units reliable?
A: We subject every unit to a 24-hour load test at 80% capacity. We also measure ripple and transient response. While not “factory new,” our tested units often outperform old stock that has sat on a shelf for a decade degrading internally.Q: Can I parallel two SPU 232.2 units for redundancy?
A: No. This model lacks active current sharing circuitry. Paralleling them without diode isolation will cause one unit to hog the load and fail. Use external diodes if redundancy is required.Q: What happens if I connect 230V AC to a unit set for 115V?
A: You will likely hear a pop and smell burning insulation. Fortunately, the SPU 232.2 is auto-ranging, so there are no voltage selection jumpers to misconfigure. Just verify the input rating on the label matches your site supply.Q: How do I know if the firmware needs an update?
A: Power supplies like this typically don’t have user-updatable firmware. The logic is hardware-based or masked ROM. If the unit passes electrical tests, the internal logic is functioning as designed.Q: Do you provide a certificate of calibration?
A: We provide a test report showing input/output voltage, current load, and ripple measurements taken at our facility. We do not offer NIST-traceable calibration certificates for discontinued power modules.
