2018.01 / g
Electric Power Generation
4
Installation and maintenance
R449 revision f
AVRs
3983 en -
1 - INTRODUCTION TO THE R449
1.1 - Application
The R449 voltage regulator is of a shunt
type. It is designed to fit as standard on A50
to A54 alternators. It can be supplied with
power either by a power VT, or by the AREP
field excitation system, or by a single-phase
or 3-phase PMG. Using the R726 external
module, the regulator can control the power
factor (2F) and can match the alternator
voltage to the mains voltage (3F) prior to
synchronisation.
1.2 - Description
The electronic components mounted in a
plastic casing are sealed with opaque
elastomer. Connection is via 2 connectors
(male «Faston» lugs 6.3).
The regulator includes:
- a main terminal strip (10 terminals) ......J1
- a secondary terminal block
(5 terminals) ..........................................J2
- a frequency selection terminal block
(3 terminals) ..........................................J3
- a quadrature droop potentiometer....... P1
- a voltage potentiometer ...................... P2
- a stability potentiometer ..................... P3
- a maximum excitation potentiometer .. P5
- a sensing selection jumper (single/
3-phase with an external module) ...... ST1
- a response time jumper .................... ST2
- a frequency selection jumper ............ ST3
- an external voltage setting jumper .... ST4
- a LAM (load adjustment module)
jumper ............................................... ST5
From R449 Version E number 10,000, this
jumper will be removable.
- a selection jumper 13% 25% LAM... ST10
- bend at 65 Hz (U/F) ......................... ST11
Two fuses (F1 and F2) are connected to this
regulator; they are mounted in the alternator
on terminal block C.
Type: gG 10/38 16A 500V.
- ATQ20 (10x38US) 500 VAC UL/CSA
Simplified diagram of a potentiometer: to
adjust the potentiometer, check the actual
position of the potentiometer stop.
5
0
10
Stop
