Overview
The SR7 is an Automatic Voltage Regulator (AVR) that maintains the generator output voltage within precise limits by controlling the exciter field current. It continuously samples the generator output voltage and adjusts excitation to compensate for load changes, engine speed variations, and temperature drift.
Key Features
- Wide Sensing Range — 220-480VAC single-phase input covers global voltage standards
- 6A Continuous Output — Reliable excitation with 8A surge capacity for load switching
- ±1% Regulation — Maintains stable voltage within 6% engine governing tolerance
- Under-Frequency Protection — Adjustable UF range 42-60Hz protects connected equipment
- 50/60Hz Operation — Compatible with global generator frequency standards
- Solid-State Design — Robust thyristor-based regulation for industrial environments
Technical Specifications
| Parameter | Value |
|---|---|
| Sensing Input | 220-480VAC, Single Phase |
| Frequency | 50/60Hz |
| UF Range | 42-60Hz |
| Output Voltage | Max 90VDC at 220VAC input |
| Output Current | Continuous 6A, Max 8A for 10 seconds |
| Regulation Accuracy | <±1% (with 6% engine governing) |
Compatibility
- Mecc Alte Alternator Series
- Compatible with: Part.: SR7
Why Choose ZenixPower
- Tight Voltage Regulation — <±1% RMS regulation ensures stable generator output under 0-100% load transients
- Fast Response — Sub-0.5 second recovery time prevents voltage dips during motor starting and load switching
- Dual Excitation Compatibility — Self-excited shunt or PMG-powered configurations clearly labeled for correct selection
- Built-in Protections — Under-frequency roll-off, over-excitation limiting, and soft-start ramp as standard
- Drop-In Replacement — Terminal layout and mounting dimensions match STAMFORD, Leroy-Somer, Marathon, and Mecc Alte OEM AVRs
- Pre-Calibrated — Each AVR ships with factory-default potentiometer settings for immediate plug-and-play operation
Specification Comparison
Compatible Generators Mecc Alte ECO/SP series universal replacement, wide voltage input suitable for multi-brand generators.
Competitors UVR6 (compact type), DER1 (digital type).
Same as UVR6 table.
Selection Advice The SR7 is Mecc Alte’s most versatile analog AVR — its wide voltage input allows adaptation to multiple generator brands. If the customer’s specific generator model cannot be confirmed, the SR7 is the safest choice. Best value when digital features are not required.
