R450M AVR | Leroy Somer Automatic Voltage Regulator

The Leroy Somer R450M AVR is an analog Automatic Voltage Regulator designed for SHUNT, AREP, or PMG excitation alternators. Its primary function is to regulate excitation current, ensuring consistent output voltage levels. Renowned for precise voltage regulation, ease of setup, and reliability, the R450M AVR features a rotating switch for U/f, LAM, excitation type, and voltage sensing. Compliant with the I.E.C. 60034-1 standard and approved by U.L. 508 / C.S.A., this AVR operates in standalone mode.

Key features and characteristics of the Leroy Somer R450M Voltage Regulator include:

• Voltage regulation: ± 0.5%.
• Under-speed protection via R450M AVR functions:
• 1 U/f (LAM: OFF).
• 2 U/f (LAM: MODE1).
• Auto-adapting LAM + 2 U/f (LAM: MODE 2).
• Nominal excitation current: 6A.
• Maximum excitation current: 10A for 10 seconds.
• Supports a range of 150V (50Hz/60Hz).
• Voltage detection: ≤ 530V.
• Protection: 10A fast fuse.
• Safeguards against load, short-circuit, and voltage reference loss.

Operating Conditions:

• Operating temperature range: -40°C to +65°C.
• Storage temperature range: -55°C to +85°C.
• Humidity: 98%.
• Maximum shock: 9g on 3 axes.
• Vibrations: Below 10 Hz - 2 mm peak magnitude; from 10 Hz to 100 Hz - 100 mm/s; below 100 Hz - 8g.

Compatible Optional Modules:

• R731: Three-phase voltage sensing.
• R734: 3-phase current and voltage sensing for parallel operation.
• R726: Regulation system altered to "4-function".

Connecting and Configuring the R450 Leroy Somer AVR:

Configuration is facilitated through the AVR interface.

• Potentiometer P1: Adjusts voltage settings.
• Potentiometer P2: Manages stability settings.
• Potentiometer P3: Controls excitation.
• Rotating switch selection 1: Facilitates frequency adjustment, U/F function, and LAM function.
• Rotating switch selection 2: Allows selection of alternator type and voltage sensing (single-phase or three-phase).
• Rotating switch selection 3: Specifies excitation type (AREP or PMG) and time response.
• Potentiometer P4: Regulates quadrature droop.