LEROY SOMER R450 | Automatic Voltage Regulator AVR

The LEROY SOMER R450 Automatic Voltage Regulator (AVR) is an analog excitation control module designed for Leroy Somer alternators using SHUNT, AREP, or PMG excitation systems. It regulates generator excitation current to maintain stable output voltage under changing load conditions.

The R450 AVR provides reliable voltage regulation, under-frequency protection, excitation control, and generator monitoring functions. It is widely used in industrial generators, marine generator sets, standby power systems, and power generation equipment requiring stable voltage control.

The module supports simple adjustment through built-in potentiometers and rotary switches for voltage, stability, excitation type, U/F protection, and LAM settings. It is commonly supplied as a replacement spare part for existing Leroy Somer alternator control systems.

🔹 Product Parameters

Parameter	Value
Brand	LEROY SOMER
Model	R450
Series	Leroy Somer AVR Excitation Control Series
Product Name	Automatic Voltage Regulator
Application	Generator Excitation & Voltage Regulation
Product Status	New Surplus / Used Tested Available
Excitation Type	SHUNT / AREP / PMG
Voltage Regulation Accuracy	±0.5%
Nominal Excitation Current	6A
Maximum Excitation Current	10A for 10 seconds
Dimensions	Approx. 200 × 140 × 58 mm
Weight	Approx. 0.8 kg
Origin / Place of Origin	France
Power Supply	Maximum 150VAC 50/60Hz
Voltage Sensing Range	95–528VAC Depending on Connection
Communication Interface	Analog Control Interface
Mounting Type	Generator Panel Mount Installation
Protection Function	Short Circuit / Overexcitation / Voltage Reference Loss
Discontinued	Legacy Product / Spare Availability Dependent

🔹 Common Questions & Answers (Q&A)

Q: What is the main function of the LEROY SOMER R450 AVR?
A: The R450 controls generator excitation current to keep alternator output voltage stable during different operating conditions.

Q: Which alternators are compatible with the R450?
A: The R450 is designed for Leroy Somer alternators using SHUNT, AREP, or PMG excitation systems.

Q: What voltage regulation accuracy does the R450 provide?
A: The R450 provides voltage regulation accuracy of approximately ±0.5%.

Q: What are common failure symptoms of a faulty R450 AVR?
A: Typical issues include unstable generator voltage, no voltage buildup, overvoltage alarms, under-voltage conditions, excitation current problems, and generator output fluctuations.

Q: Can the R450 replace another AVR model directly?
A: Replacement requires checking alternator model, excitation type, wiring connections, voltage sensing configuration, and AVR settings.

Q: What should be checked before installation?
A: Verify terminal wiring, excitation circuit, voltage sensing connections, generator parameters, frequency settings, and adjustment positions before startup.

Q: Does the R450 support parallel generator operation?
A: Yes. The R450 includes current sensing input functions for generator parallel operation applications.

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