Overview
The R220 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
- ±0.5% Regulation — High-precision analog control
- 3A Nominal Output — 63VDC max, 7A maximum for 10 seconds
- Transistor-Controlled — Superior transient response vs thyristor designs
- 85-139VAC Sensing — Ideal for lower-voltage generator configurations
- Quick Response — 500ms to reach 98% rated voltage
- 1.07 U/F Function — Built-in under-frequency protection
Technical Specifications
| Parameter | Value |
|---|---|
| Sensing Input | 85-139VAC (50/60Hz) |
| Output Voltage | Max 63VDC at 120VAC input |
| Output Current | Nominal 3A, Maximum 7A for 10s |
| Regulation Accuracy | <±0.5% |
| Frequency | 10-100 Hz |
| Excitation Type | Self-excited shunt (transistor-controlled) |
| UF Function | 1.07 U/F |
| Response Time | 500 ms to 98% voltage |
Compatibility
- Leroy Somer Alternator Series
- Compatible with: Part.: R220
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 Leroy Somer LSA 43-44 series 30-200kW.
Competitors R220 (3A) / R230 (4A) / R250 (5A).
| Parameter | R220 | R230 | R250 |
| Current | 3A | 4A | 5A |
| Regulation | ±0.5% | ±0.5% | ±0.5% |
| Price (with R731) | $90-140 | $100-160 | $110-190 |
Selection Advice Three models tiered by current. When uncertain about excitation requirements, the R230 is the safe choice. For confirmed large excitation needs, choose the R250.
