Automatic Voltage Regulator AVR R120 for Leroy Somer Generator
The R120 is used on the following Leroy Somer Alternators:TAL040 B, TAL040 C, TAL040 C1, TAL040 D, TAL040 E, TAL040 FTAL042 A, TAL042 B, TAL042 C, TAL042 D, TAL042 E, TAL042 F, TAL042 G, TAL042 HTAL044 A, TAL044 B, TAL044 C, TAL044 D, TAL044 D1, TAL044 E, TAL044 H, TAL044 J, TAL044 K
SAME EXACT AVR AS:Leroy Somer Voltage Regulator AEM230RE005Leroy Somer Voltage Regulator 4969966
Specification:Sensing input:– Voltage: 277 VAC 10% for 1-phase,415 VAC line-to-line 10% for 3-phase,2-line sensing. The AVR senses the trueaverage of the line-to-line waveform. Usethe resistor (SMD) network for trouble-freesensing and control of sensed voltage/ regulation.Input power:– Voltage: 277 VAC rms 10%– Frequency: 50/60 HzOutput power:– Voltage: 95 VDC for 240 VAC Input– Current:4 A DC6 A for 30 sec. (when allowed by the field resistance)Operating temperature: -20C to +70CStorage temperature: -40C to +80CVoltage setting: min 10% of rated voltage.Stability setting: can be adjusted to obtaina correct transient response in steady state.Under frequency roll-off setting: availablebelow 46 Hz for 50 Hz and below 56 Hz for 60 Hz.Voltage build-up: 2 Volts (L-N)Voltage regulation: 1% at the AVRterminals with a THC <5%.Thermal drift: 1% for 30C change in temperature.Response time: less than 50 ms.Closed loop response: typically 0.5 sec to recover 98% of the defined voltage for a field forcing ratio of 1:2.Sensing loss protection: the voltageshould disappear when the sensing circuit is open.Overexcitation protection: 10 VDC to 85 VDC.Set point: 60 VDCProtection fuse: 4 A, 240 VAC.Potentiometer sealing: except for theV-trim potentiometer, all potentiometers are sealed.Frequency roll-off indicator: LED provided (UF).Sensing loss indicator: LED provided (SL).Overexcitation indicator: LED provided (OE).Protection on the devices: suitable R-Csnubber to be provided for the device usedto protect against voltage surges.Potting/Encapsulation details: thecomponents on the AVR should becompletely encapsulated with suitable PUresin compound to absorb transients/vibrations during operation.Alternator excitation details: (typical)– Full load:Excitation voltage: 40 to 50 VExcitation current: 2.5 to 4.0 A
