Leory Somer R450M Automatic Voltage Regulator is an analog A.V.R.. It is designed for alternators with a SHUNT, AREP or PMG excitation .

R450M Leroy Somer Automatic Voltage Regulator controls the excitation current in order to maintain the output voltage of the alternator. Leroy Somer R450 Voltage Regulatoris performant in terms of voltage regulation, simple to set, to use and is reliable.

Rotating switch for U/f, LAM, excitation type and voltage sensing are available. It is in compliance with I.E.C. 60034-1 standard and U.L. 508 / C.S.A. approved 

Operation mode: Standalone 

Main feature and characteristics of Leroy Somer R450M Voltage Regulator:

- Voltage regulation : ± 0.5 %.

- Under-speed protection by function of R450M AVR :

1 U/f (LAM : OFF).

2 U/f (LAM : MODE1).

Auto-adaptating LAM + 2 U/f (LAM : MODE 2).

- Nominal excitation current : 6A.

- Maximum excitation current : 10A during 10 s.

- Provide range 150V (50Hz/60Hz).

- Voltage détection : ≤ 530 V.

- Protection : fuse fast 10A.

- Protection on load, short-circuit and voltage reference loss.

 Operation conditions: 

- Operating temperature range : - 40° C à + 65° C.

- Storage temperature range : - 55° C à + 85° C.

- Hygrometry : 98%.

- Maximum choc : 9 g on 3 axis..

- Vibrations : less than 10 Hz , 2 mm peak magnitude.

From 10 Hz to 100 Hz : 100 mm/s, below 100 Hz : 8g.

Optional modules compatible

- R 731 : three phase voltage sensing.

- R 734 : 3-phase current and voltage sensing for parallel operation

- R 726 : regulation system changed to “4 - function” 

Connexion and setting of R450 Leroy Somer AVR:

Settings are done through the A.V.R.

- Potentiometer P1 : voltage setting.

- Potentiometer P2 : stability setting.

- Potentiometer P3 : excitation.

- Rotating switch selection 1 : frequency, U/F function, LAM function

- Rotating switch selection 2 : alternator type and voltage sensing (1 ph. ou 3 ph.).

- Rotating switch selection 3 : excitation type (AREP or PMG) and time response.

- Potentiometer P4 : quadrature droop.