4.5 kW Electronic Rectifier Cum Regulating Unit (ERRU)
RDSO / Spec No.
RDSO/PE/SPEC/AC/0013-2011 Rev.3
Application
Indian Railways (Rolling Stock) - Coach Power & Battery Charging
Product Specifications & Details
The 4.5 kW Electronic Rectifier Cum Regulating Unit (ERRU) manufactured by General Auto Electric Corporation (GAEC) is an under-slung power management system designed to supply DC power to railway coaches while simultaneously regulating alternator output to charge battery banks. Compliant with RDSO Specification No. RDSO/PE/SPEC/AC/0013-2011 Rev.3, this unit features microprocessor-based IGBT control for smooth operational performance across alternator speeds ranging from 350 to 2500 rpm. Housed in a rust-free SS-304 enclosure, it includes integrated USB data logging along with a keypad and LCD interface for parameter configuration and monitoring.
Key System Features
- Microprocessor & IGBT Control: Delivers precise regulation and reliable operation across a wide speed range (350 to 2500 rpm).
- Data Logging Facility: Built-in data logging with quick USB drive export for diagnostics and performance monitoring.
- Interactive Interface: Integrated Keypad and LCD display for programming parameters and real-time status monitoring.
- Low Cut-In Speed: Fast power generation start with a cut-in speed under 350 rpm.
- Stainless Steel Housing: Housed in a corrosion-resistant SS-304 enclosure rated for rugged under-slung rail environments.
- RDSO Approved: Certified and approved by RDSO Lucknow for Indian Railways rolling stock applications.
Technical Specifications Table
| Parameter | Specification Standard |
|---|---|
| No Load DC Output Voltage | 135 V (Maximum) | Settable between 120V – 130V |
| Voltage Regulation & Ripple | Regulation: ± 2% of Set Value | Ripple: < 2% |
| Full Load Efficiency | > 95% (at 1800 rpm) |
| Load Variation & Speed Variation | Load Range: 1 A to 37.5 A | Speed Range: 350 rpm to 2500 rpm |
| Voltage at Overload of 40A | 115 V (Min) |
| Battery Charging Current Limit | Settable up to 24 A (Max) |
| Insulation Level | > 20MΩ @ 500V DC |
| High Voltage Withstand Capacity | 1.5 kV AC (RMS) for 1 Minute |
| Ingress Protection | IP-67 (Enclosure spec rated IP-65) |
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