Leroy Somer AVR R438 | Original
Fuse: F1on X1,X2.10A;slow-250V
- Voltage sensing : 5 VA isolated via trans- former • 0-110 V terminals = 95 to 140 V • 0-220 V terminals = 170 to 260 V • 0-380 V terminals = 340 to 520 V for other voltages, a transformer should be used.
- Voltage regulation ± 0.5%
- Normal or rapid response time via jumper ST2 (see below)
- Voltage adjustment via potentiometer P2 or apply a DC voltage of ± 1 V on the terminals of the external potentiometer
- Current sensing: (parallel operation): input S1, S2 intended for 1 C.T. Š 2.5 VA cl1, secondary 1A (optional)
- Quadrature droop adjustment via potentio- meter P1
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The R438 is an Automatic Voltage Regulator (AVR) for Leroy Somer brushless generators, compatible with AREP or PMG excitation systems. It accepts a 3-phase power input of 40–50V AC, with voltage sensing available at three selectable ranges: 95–140V (50/60 Hz), 170–260V (50/60 Hz), or 340–520V (50/60 Hz).
The R438 delivers a maximum output of 160V DC at 120V AC input, with a maximum current of 8A. Minimum field resistance is 15 ohms. Voltage regulation accuracy is ±0.5%. Short circuit capability is 3× rated current for 10 seconds (with AREP or PMG excitation). Rated overload current is 8A for 10 seconds.
Response time is 1 second (normal) or 0.3 seconds (rapid) for a ±20% voltage variation. Remote voltage adjustment range is ±5%. Internal fuse protection (F1 on X1, X2) is rated at 8A slow-blow, 250V. Operating temperature range is -40°C to +70°C.
Additional information
| BRANDS | Power Master Inc. |
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