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3. Key Technical Specifications
| Parameter | Value |
| Input Voltage Range | 100 to 150 V DC (Nominal 125 V DC) |
| Logic Outputs | +5 V DC, +15 V DC, -15 V DC |
| I/O Power Output | +24 V DC (Regulated) |
| Cooling | Integrated internal cooling fan |
| Protection | Over-voltage, over-current, and thermal shutdown |
| Status Feedback | Output voltage and temperature monitoring via VMEbus |
| Form Factor | High-density rack-mounted module |
| Efficiency | >80% at full load |
| Operating Temp | 0 to 60°C (32 to 140°F) |
4. Product Introduction & Supply Chain Strategy
The GE IS2020LVPSG2A is the foundational power source for the Mark VI Speedtronic control rack. It converts high-voltage station battery power into the precise, regulated low-voltage rails required by sensitive VME processors and analog I/O boards. Without a stable output from this module, the entire control system is susceptible to logic resets, processor hangs, and intermittent signal noise.
From a supply chain perspective, the IS2020LVPSG2A is a “single point of failure” component. While many modules in a Mark VI system are redundant, a power supply failure can compromise an entire rack. Procurement of this board as New Surplus is a strategic necessity because power supplies are the first components to age; the electrolytic capacitors in refurbished units have a finite chemical lifespan and are prone to leakage or “drying out” after years of service. A New Surplus unit ensures the longest possible Mean Time Between Failures (MTBF) and protects your primary control assets from power-induced downtime.
- IS2020LVPSG2A
- IS2020LVPSG2A
5. Installation & Configuration Guide
Stage 1: Pre-Installation (Prep & Safety)
Ensure the turbine is in a safe, stopped state. Open the upstream DC circuit breaker providing power to the rack. Use a multimeter to verify zero voltage at the input terminals. Wear an ESD wrist strap and verify that the internal cooling fan on the new IS2020LVPSG2A rotates freely.
Stage 2: Removal
Disconnect the input power wiring harness. Loosen the vertical mounting screws that secure the LVPS module to the rack chassis. Carefully slide the module forward, supporting its weight (these units are significantly heavier than standard I/O cards).
Stage 3: Installation (Clone & Seat)
Inspect the backplane connector for any signs of arcing or carbon buildup. Slide the new IS2020LVPSG2A into the rack guides until the connector is fully seated. Reinstall the mounting screws to ensure the module is grounded to the chassis frame. Reconnect the input power harness.
Stage 4: Power-On & Testing
Re-apply DC input power. Check the front-panel status LEDs—all voltage rail indicators should be green. Use the Mark VI Toolbox diagnostic screens to verify that the reported internal temperatures and output voltages are within +/- 2% of nominal values.
6. Firmware/Software Versions & Upgrade Notes
- Passive Intelligence: The IS2020LVPSG2A does not typically require a firmware download, as its logic is hardware-defined. However, it does provide diagnostic data to the VME controller.
- Compatibility: The “G2A” version is designed for specific rack power requirements. Verify your rack’s total power draw (Amps) before replacing a “G1” with a “G2” to ensure current ratings are compatible.
- Note: If the controller fails to “see” the power supply status after installation, check the VMEbus cable connections, as the monitoring data travels via the backplane.
7. Frequently Asked Questions (FAQ)
Q: Can I replace an IS2020LVPSG1A with this G2A model?
A: Generally, the G2A is a higher-capacity or updated version of the G1A. However, you must verify the physical dimensions and the specific output current ratings listed on your system’s elementary drawings to ensure it meets the rack’s load demand.
Q: Why shouldn’t I just buy a refurbished power supply for half the price?
A: Power supplies are “wear items.” The capacitors inside have a shelf life and a service life. A refurbished unit may look clean, but its internal components have already endured years of heat. When a power supply fails, it can send a voltage spike through your $10,000 processor cards. New Surplus is the only way to guarantee the safety of your downstream electronics.
Q: My “Fail” LED is on, but the turbine is still running. Is the board okay?
A: This often indicates a fan failure or a marginal over-temperature condition. Even if the voltages are currently stable, the board will eventually overheat and shut down. This should be treated as a critical “Last-Time-Buy” or replacement priority.
Q: Does this unit handle 110V AC or 125V DC?
A: The IS2020LVPSG2A is designed for 125V DC input, which is the standard for utility-scale battery backup systems. Using it with AC power will cause immediate, irreparable damage to the internal rectifier stage.
Q: How do you pack these for shipping?
A: Given the weight and sensitivity of the internal transformers, we use heavy-duty, double-walled boxes and ESD-shielded vacuum packaging. We ensure the unit is immobilized to prevent connector damage during transit.
