R448 datasheet(7/16 Pages) NIDEC

7 / 16 page

Installation and maintenance

R448 & R448 V50

A.V.R.

3972 en - 05.2008 / e

LEROY-SOMER

2.3 - SHUNT or separate excitation

system

In SHUNT excitation, R 448 A.V.R. is

supplied by main windings (140V - 50/60

Hz) to X1, X2.

The new functions are :

- Parallel operation between alternators

with C.T.

- Parallel operation with the mains with C.T.

and R 726 module

- 3-phase sensing (R 731 module)

- LAM function integrated in the R 448 AVR.

In this case of LSA 42.2, A.V.R. and

module(s) must be installed in the

external control panel.

X1 Z2 E+ E- 0V 110 220 380

T10

T11

T12

R 448

ST5

ST11

ST2

STATOR : 12 wires (marked T1 to T12)

SHUNT SYSTEM

Field

Armature

MAIN FIELD

Slow fuse

250V 10 A

with LAM

without LAM

Excitation

ceiling

knee-point: 65 Hz

open

Response

time

normal

fast

Stability

according voltage

ST6

ST1

46.2/47.2

49.1

No ST6 jumper

for R448 V50

4 x holes Ø 5.8

(175 x 115 mm)

140 mm

R731

Option

ST4 Option

T.I.

Option

Ph.1

Voltage

Single-

phase

detection

External potentiometer

for adjusting the voltage

in 3-ph. detection ST1 open

3-ph. detection

ST9

AREP/SHUNT

PMG

ST3

50Hz

60Hz

ST10

13 %

LAM

25 %

Frequency

Quad

droop

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