Rf. 2749 - 4.33 / a - 9.

98

P5
P4
P3
P2 T5
ST2 S
ST1

P1

J1 (400V - 10A)

X2
Z1 t
X1 - +
/ Storage batterry
Z2 (B Volt)
E+
10 / ~ 10 ohms
E-
/ Exciter field

((

R 449
/
 Regulator
R 449 R 449
1. R 449 1. Automatic Voltage Regulator R 449
: CAUTION : IT IS HAZARDOUS TO PROCEED TO ANY
- HIGH VOLTAGE TEST ON THE ALTERNATOR WI-
THOUT HAVING PREVIOUSLY DISCONNECTED ALL
CONNECTIONS TO VOLTAGE REGULATOR.
. DAMAGES OCCURING TO AVR IN SUCH CONDI-
, TIONS WILL NOT BE CONSIDERED IN A WARRANTY
, CLAIM.
.
1.1 - General
1.1 - The PC board with electronic components is located
inside an insulating plastic box and embeded in elasto-
mere resin.Terminals consist in 1/4" "Faston" lugs and a
. connector 10 terminals (J1).
"Faston" For connections and adjustments are :
6,3 10 ( J1). - main terminal strip J1 (10 marked terminal)
: - terminal strip J2 (5 marked terminal)
- J1 10 ) - terminal strip J3 (3 marked terminal)
- J2 (5 - potentiometer (screw) droop : P1
- potentiometer (screw) voltage : P2
)
- potentiometer (screw) stability : P3
- J3 (3
- potentiometer (screw) frequency : P4
) - potentiometer (screw) excitation ceiling : P5
- 1 - link ST1 : 1 phase / 3 phase sensing (external module)
- 2 - link ST2 : normal / fast recovery selection
- 3 - jumper ST3 : 50 / 60 Hz operation selection
- . 4 - jumper ST4 : to remove to install remote 470 trimmer
- 5 - link ST5 : LAM cutting ST5 removes LAM function
- : ST11 /3 ,

- : ST2
/
- : ST3 50 / 60
- : : ST4
470
- : ST5
LAM (
)

140
5,8
115
175

J3
P5
P4
P3 ST3
J2 P2 T5
ST2 S
ST1
200

60
ST4
P1

J1

2
 Regulator
R 449 R 449
1.2 - 1.2 - Regulators data
- ; 2 (X1X2, - normal power supply : 2 auxiliary windings
Z1Z2). (X1X2,Z1Z2)
- , . 1250 50/60 - shunt supply : 150V - 50/60Hz
- : 15 , 10 - rated overload current : 15A, 10s.
- ( , ,
) : - electronic inbuilt protection (overload short circuit, loss
10 , of sensing): the excitation current rises to ceiling level
1 . during 10 seconds, then drops to about 1A.
( The alternator must be stopped (either cut off the
) . supply) to reset this protection.
- F1, F2 - protection of power inputs by fuses F1,F2 in the gene-
rator.
- : 5
- voltage sensing : 5 VA insulated through transformer
0-200 = 170 - 260 terminals 0-220 V = 170 to 260 V
0-380 = 240 - 520 terminals 0-380 V = 340 to 520 V
2. - voltage adjustment by pot P2
- - - other voltages by using an adapting transformer
- current sensing (parallel operation) C.T. 2,5 VA class 1
- ( secondary current 1A (optional).
) : T.I. 2,5 . 1, . 1 () - adjustment of quadrature droop with pot P1
- 1 - Underspeed protection (U/f) and LAM : threshold fre-
- (U/f) LAM :
4 quency adjustable by P4.
- . - adjustment of excitation ceiling current by P5: 4,5 to 15A
5 : 4,5 - 15 - 50/60 Hz selection by jumper ST3.
- 50/60 ST3

1.3 - LAM 1.3 - Load acceptance module

- LAM ST5 - action of LAM is suppressed by cutting ST5
,

Voltage ST5/ST5 cut

UN
P2 Voltage

U/f
0,85 UN LAM

Under frequency and LAM

P4
Frequency

48 58 50 60
0
fC fN
ST3

- LAM ( )
- LAM (Load Acceptance Module) function.
. When applying a step load, the rotationnal speed (fre-
LAM quency) of the gen-set drops. Below the prest value of
. 15 %, frequency the "LAM" drops the voltage of about 15% and
. 25 by this way reduces the effective step of about 25%,as
% ,
. long as the speed has not recovered the rated value.
LAM The "LAM" so enables, either to reduce the speed drop,
() and the duration of it for the same step load, or to increa-
, se the applicable step load for the same speed variation
(turbo charged engines).
( ). To prevent voltage oscillations, the frequency threshold
must be adjusted about 2 Hz below the lowest frequency
LAM in normal steady state operation.
2
.

3
 Regulator
R 449 R 449
"LAM" TYPICAL EFFECT WITH TURBO CHARGED
LAM ENGINES

Transient voltage dip

Voltage
UN

0,9
(U/f)

0,8
LAM

Speed dip LAM

Frequency
fN

0,9

0,8
,
LAM LAM
"LAM" action
Load on the shaft (kW)
Charge sur l'arbre (kW)

P
Step load

Load

0 1 2 3 Time (s)

LAM /without LAM (U/F/only) LAM / with Lam

4
 Regulator
R 449 R 449
1.4 - 1.4 - Optional items
- - C.T. for parallel operation with other generators
- remote voltage adjusting potentiometer 470 .3.W (*)
- giving an adjustment range of 5% (centering of the
470 (*) 3 : +
5% ( range by using internal P2 potentiometer). Remove ST4
). to connect the potentiometer.
S4. - three phase sensing : additional modul R 730 : 200 to
- : 500 V. Cut ST1 to connect the module. Voltage is adjus-
R 730 : 200 500 . ted by using the voltage adjustment potentiometer on the
ST1. module.
. - power factor regulator (2 nd function) and voltage
- cos ( ) equalisation before paralleling with the mains (3 rd func-
tion)
( ).
... 1 - 5 1 C.T. ....../1A . 5 VA CL 1
R 724 : 2 () Module R 724 : 2 functions - (external).
R 725 : 3 () Module R 725 : 3 functions - (external).
(*) : 1 (*) Note : For a wider voltage range - 1 k /3W may be
. used.

1.5 - 1.5 - Special applications

A) - A) - Field de-energizing

(1 Cutting excitation current is fulfilled by switching off the
). : 15 - 220 . supply to AVR (1 lead on each auxiliary winding)
Contacts caliber : 15A . 250V AC
. Same connection to reset internal protection of AVR.

J1 Aux. windings
R 449 X2
Z1
X1
Z2
E+
E-

B) - B) - Forced build-up

400 - 10 /400V - 10A)

Forced build up J1
R 449 X2
Z1 t
X1 - +
/ Storage batterry
Z2 (B Volt)
t E+
. 10 / ~ 10 ohms
E-
/ Exciter field
Time

B VOLT Temps / Time t Application

Safety flashing
Paralleling when de-excited
12 (1.2 A) 1-2s

24 (2.4 A) 5 - 10 s Paralleling when at standstill

Frequency starting
48 (4.8 A) 5 - 10 s
Build-up in over load

1.6 - Preliminary check

1.6 - Check fuses F1, F2
F1, F2

5
 Regulator
R 449 R 449
1.6.1 - 1.6.1 - Static test AVR
* A proper operation of A.V.R. through static tests
does not mean necessarily it can operate properly in

. ral situation.
* Reversely, if the A.V.R. does not react properly du-
, ring static tests, it is obviously out of duty.
.
- Connect the test setup as shown here after.
- - The supply voltage must be in the range 200 - 240 V
- and the lamp voltage either 220 V.
200 - 240 , - Lamp power : less than 100 Watt
220 . 100 . b) - Adjust the potentiometer P2 to maximum
) 2
, CCW
) : c) - Apply power to the AVR : lamp should flash
momentarily
d) - Slowly rotate the AVR voltage potentiometer
) clockwise:
- the lamp reaches full brillance before to be fully clock-
- wise
- at the regulating point a small change in the potentio-
- meter position turns on or off. If the lamp remains dark or

light the AVR is not operating.
.
,
.

200 -240 / 200 - 240 V

ST3 According frequency (220 ) / (220 V)
R 449

P5 X2
50Hz 60Hz Z1
P4 X1
( 50/60 )
ST5
Mains (Supply 50/60 Hz)
Z2
ST2
E+
Frequency P3 E-
0V
P2 ST1 P1
S1 S2 220V V 300 .
380V 300 V : C.C / D C
Voltage

ST4

, Make an intial test by supplying AVR through terminals

1, 2, X1,X2, then a second test by supplying it through termi-
,
Z1, Z2. nals Z1,Z2.

1.7 - LAM 1.7 - Static test LAM (underspeed protection)

( ) - the voltage adjustment P2 should be preset in position
- 2 where the lamp just begins to glow. Turn P4 slowly CCW
, , the brightness should decrease suddenly : voltage at
4 . AVR's output E+, E- falls about 15%. Then reset P4 to
: initial position : the lamp should glow as before.
. 85 % .
4.
.

6
 Rgulateur
R 449 R 449
1.8 R 449 1.8 AVR adjustment
1.8.1 - , , 1.8.1 - Voltage, frequency, stability adjustment

. Action Factory adjustment (A.F)

(R.U.)
400 - 50 Voltage minimum 400V - 50 Hz
. 0 - 380 P2 fully CCW ( 0 - 380 V)

Stability Not adjusted

P3 ( middle)

ST3 = 50 Frequency ST3 on 50 Hz
R.U. = 47,5 Threshold for under- (A.F..) = 47,5 Hz
P4 speed protection U/f
ST3 = 60 ST3 on 60 Hz
LAM . R.U. = 57 and LAM function (A.F.) = 57 Hz
Quadrature voltage
droop Not adjusted
c . ( ) P1 (Parallel operation with ( fully CCW)
- 0, C.T.)
- No droop fully CCW
Ceiling excitation
current
4 0- 5 Excitation current and 4 at 5 A
P5
. short circuit current or maximum
,
. limitation, minimum
fully CCW

1.8.1.1 - 1.8.1.1 - Selection of operation mode

- () - sensing voltage

Bornes / Terminals
R.U. = 0 - 380 50 / 60 0 - 220 / 0 - 220 V 0 - 380 / 0 - 380 V A.F. = 0 - 380 V
170 - 260 / 170 - 260 V 340 - 520 / 340 - 520 V
- (
+ LAM ), ST3 - frequency (protection + LAM), selector jumper ST3
R.U. = 50 A.F. = 50 Hz

50 Hz J3 60 Hz J3
ST3 ST3

- : ST2
R.U. = . . Rapide - voltage recovery speed : link ST2
ST2 ST2
Standard Fast A.F. = standard

- Interieur Exterieur
R.U. = .
J2 J2 - voltage setting : ST4
A.F. = Internal
Rhe

ST4 ST4

7
 Regulator
R 449 R 449
1.8.1.2 - 1.8.1.2 - Adjustment procedure
) a) Initial setting of potentiometers
- 2 : . - P2 VOLTAGE : lowest fully CCW.
- 3 :
- 4 : - P3 STABILITY : middle position.
- 1 : 0 - - P4 FREQUENCY : fully CW.
- 5 : - P1 QUADRATURE VOLTAGE DROP : fully CCW
, . - P5 EXCITATION CURRENT LIMIT : to be adjusted
- : =
470 ( ST4 ) : . only if necessary maximum fully CW.
- Remote voltage trimmer Rhe - 470 (jumper ST4 re-
) () moved) : middle position.
100 . +, -
, 300 -
500 1000 . b) Connect one analoge (needle) voltmeter cal. 100V
D.C. across E+, E- terminals and another (300V - 500V
) or 1000V A.C. across the alternator output terminals.
(f > 50 60 ).
) 2 c) Drive the generator at its real no-load speed (f > 50
: Hz or 60 Hz)
- UN
(, 400 ) d) Adjust output voltage with P2 to the required value
- + 2 - 4 %
- rated voltage UN if generator operates alone
(, 410 - . ) (for example 400V)
- or UN + 2 to 4% for parallel operation with C.T.
) , (i.e. 410V - see below)
3 ,
, +
- (. 10 .). e) If voltage is unstable, adjust P3 (try in both directions),
, noting voltage across E+, E- (approx.10V D.C.). The fas-
. test recovery time may be achieved when P3 is set close
ST2
(./.). to the limit of unstability. If there is none stable position
try another adjustment after having cut or reconnected
) , link ST2 (normal / fast)
47,5 50 ( 57
60 ), , 5 %
( f) Reduce the gen-set speed to get 47,5 Hz (for 50 ra-
). 4 , ting) or 57 Hz (for 60 rating), more precisely 5 % below
. the normal frequency of genset in overload (Fuel stop
( 15 %), condition). Rotate slowly P4, CCW, observing the output
, .
voltage of generator. When voltage drops (about - 15%),
) turn back scarcely until voltage raises.
.
) g) Readjust the speed of gen-set to its normal no-load
( level.
S1, S2 J2) :
- 1 () h) Presetting for parallel operation (with C.T. connected
to terminals S1,S2 of terminal strip J2)
(cos = 0,8 )
2-3 %. - Potentiometer P1 (Voltage droop) in middle position.
, , Switch on the rated load (P.F. 0,8 inductive). The output
. voltage should drop 2% to 3%. If it raise, change over
the 2 leads coming from C.T. secondary.

) ADJUSTMENTS IN PARALLEL OPERATION

,
. i) No load voltages must be identical on all gen-sets re-
- quired to work together in parallel.
- , - Synchronise and parallel the gen-sets together.
0 - By adjusting speed , try to reduce the power exchange.
- 2 to 0 KW
- By adjusting voltage pot (P2 or Rhe) on one of the ma-
( )
- chines try to cancell (or minimize) the circulating current.
- Do not alter the voltage adjustments.
) (
) j) Switch on the available load (correct adjustment can-
- not be made if there is no reactive load).
( - By adjusting speed , balance the KW (proportionnally
) to the rated powers of gen-sets).
- 1 - By adjusting Voltage droop pot. P1 , balance the output
. currents.

8
 Regulator
R 449 R 449
1.8.2 - . 1.8.2 - Adjustment of maximum excitation current
- , (Excitation ceiling)
5 ( : 15 , - static adjustment of excitation current limitation, poten-
15 10 ). tiomtre P5 (factory adjustment : 15 A, fuse caliber : 15
A - 10 seconds).

ST3 According frequency ( 50/60 )
R 449 Mains (Supply 50/60 Hz)
P5 X2
50 60 / Z1 A
50Hz 60Hz
P4 ST5 X1

Z2
. ST2 10
E+
E- Exciter field
P3 - + ~ 10 ohms
0V
ST1
A
P2 P1
S1 S2 220V 10 . / 10A CC / DC
380V D
Voltage

ST4

The factory adjustment corresponds to the excitation cur-

, , rent for a sustained 3 phase short circuit, of about 3 ti-
mes the rated current ,unless otherwise specified.(*)
. To modify this setting it is possible to proceed to a static
50 , adjustment (generator at standstill) by a method that is
, safe for the machine and the plant.
(*). Disconnect the supply leads (X1,X2,Z1,Z2) and sensing
(, leads (0-220-380) from A.V.R.. Connect the supply as
) , shown (X1,X2,0,220V). Connect an ammeter (20A , dc)
, in series with the exciter field. Turn P5 fully CCW. Switch
, on the supply. If there is no output current from AVR,
. 1, 2 Z1, turn P2 (voltage) clockwise until ammeter indicates a
Z2 (0 - 220 - 380 ) . stabilized current.
(200 - 240 ), Switch the supply off, then on again. Turn P5 clockwise
(1, 2 : 0-220 ). until the required current is obtained in the exciter field.
(limit to 15A)
20 .. Checking internal protection :
, Switch off (D) : the excitation current must rise to the
2 () pre-set high level, and remain at this level for a period of
, more than 10 seconds, than fall to less than 1A.
. , To reset, switch off the supply by opening switch (A).
, 5
. Note : After having adjusted the excitation current limita-
( 15 ). tion as indicated above, proceed to the voltage/frequen-
: cy adjustment .
(D) :
(*) : In many countries the short-circuit current equal to 3
, IN is obligatory.
> 10
1 .

().
:

,
.

(*) :
.

.