Automatic Voltage Regulator AVR R120 for Leroy Somer Generator
R120 is used on the following Leroy Somer generators:
TAL040 B, TAL040 C, TAL040 C1, TAL040 D, TAL040 E, TAL040 F
TAL042 A, TAL042 B, TAL042 C, TAL042 D, TAL042 E, TAL042 F, TAL042 G, TAL042 H
TAL044 A, TAL044 B, TAL044 C, TAL044 D, TAL044 D1, TAL044 E, TAL044 H, TAL044 J, TAL044 K
THE SAME EXACT AVR AS:
Leroy Somer voltage regulator AEM230RE005
Leroy 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. AVR senses the true
the average of the line-to-line waveform. Using
resistor network (SMD) for trouble-free
sensing and control of sensed voltage/regulation.
Input power:
- Voltage: 277 VAC rms ± 10%
- Frequency: 50/60 Hz
Output:
- Voltage: 95 VDC for 240 VAC input
- Current:
4A DC
6 A for 30 sec. (when permitted by the field resistance)
Operating temperature: -20ºC to +70ºC
Storage temperature: -40ºC to +80ºC
Voltage setting: min ± 10% of rated voltage.
Stability setting: can be adjusted to obtain
a correct steady state transient response.
During frequency roll-off setting: available
below 46 Hz for 50 Hz and below 56 Hz for 60 Hz.
Voltage build-up: 2 volts (LN)
Voltage regulation: ± 1% at AVR
terminals with a THC <5%.
Thermal drift: ± 1% for 30ºC temperature change.
Response time: less than 50 ms.
Closed loop response: typically 0.5 seconds to recover 98% of the defined voltage for a field forcing ratio of 1:2.
Loss of sense protection: voltage
should disappear when the sensing circuit is open.
Overexcitation protection: 10 VDC to 85 VDC.
Setpoint: 60 VDC
Fuse rating: 4 A, 240 VAC.
Potentiometer seal: except for
V-trim potentiometer, all potentiometers are sealed.
Frequency settlement indicator: LED included (UF).
Loss of Sense Indicator: LED included (SL).
Overexcitation indicator: LED included (OE).
Protection of the devices: suitable RC
attenuators to be provided for the device used
to protect against power surges.
Potting/Encapsulation details: the
components on the AVR should be
fully encapsulated with suitable PU
resin compound to absorb transients/
vibrations during operation.
Generator excitation details: (typical)
- Full load:
Excitation voltage: 40 to 50 V
Excitation current: 2.5 to 4.0 A
