Nidec Leroy-Somer R449 Instruction Manual

X2 X1 Z2 E+ E- 0V

110 220 380

R449

R449 revision f

AVRs

Installation and maintenance

2018.01 / g

Electric Power Generation

Installation and maintenance

R449 revision f

AVRs

3983 en -

SAFETY MEASURES

Before using your machine for the rst time,

it is important to read the whole of this

installation and maintenance manual.

All necessary operations and interventions

on this machine must be performed by a

qualied technician.

Our technical support service will be pleased

to provide any additional information you

may require.

The various operations described in this

manual are accompanied by recom-

mendations or symbols to alert the user to

potential risks of accidents. It is vital that

you understand and take notice of the

following warning symbols.

Warning symbol for an operation capable

of damaging or destroying the machine

or surrounding equipment.

Warning symbol for general danger to

personnel.

Warning symbol for electrical danger to

personnel.

All servicing or repair operations

performed on the AVR should be

undertaken by personnel trained in the

commissioning, servicing and main-

tenance of electrical and mechanical

components.

When the generator is driven at a

frequency below 28 Hz for more than 30

seconds with an analogue AVR, its AC

power supply must be disconnected.

WARNING

This AVR can be incorporated in a EC-

marked machine.

This manual is to be given to the end

user.

characteristics of this product at any time in

order to incorporate the latest technological

developments. The information contained in

this document may therefore be changed

without notice.

This document may not be reproduced in

any form without prior authorisation.

All brands and models have been registered

and patents applied for.

WARNING

This manual concerns the alternator AVR which you have just purchased.

We wish to draw your attention to the contents of this maintenance manual.

2018.01 / g

Electric Power Generation

Installation and maintenance

R449 revision f

AVRs

3983 en -

CONTENTS

1 - INTRODUCTION TO THE R449 .........................................................................................4

1.1 - Application....................................................................................................................4

1.2 - Description...................................................................................................................4

1.3 - Electrical characteristics...............................................................................................8

1.4 - Environment............................................................................................................... 11

2 - R726: REGULATION OF POWER FACTOR (2F) AND MAINS SENSING (3F) ...............12

2.1 - Operating diagram .....................................................................................................12

2.2 - Potentiometers........................................................................................................... 13

3 - TYPICAL DIAGRAMS......................................................................................................14

3.1 - AREP 1F LV excitation ...............................................................................................14

3.2 - AREP 1F MV excitation ..............................................................................................15

3.3 - AREP 3F LV excitation ...............................................................................................16

3.4 - AREP 3F MV excitation ..............................................................................................17

3.5 - 1F LV shunt + booster excitation ................................................................................18

3.6 - 1F LV PMG excitation.................................................................................................19

4 - COMMISSIONING............................................................................................................ 20

4.1 - In case of standalone regulation.................................................................................20

4.2 - In case of 1F regulation (parallel operation between alternators) ...............................20

4.3 - In case of 2F (power factor regulation) and 3F (voltage match circuit)........................20

5 - TROUBLESHOOTING .....................................................................................................22

5.1 - Checking the windings and rotating diodes using a separate excitation .....................22

5.2 - Static checking of the regulator ..................................................................................22

5.3 - Troubleshooting table ................................................................................................23

5.4 - Replacing the regulator with a spare voltage regulator ..............................................25

6 - SPARE PARTS.................................................................................................................25

6.1 - Designation................................................................................................................25

6.2 - Technical support service ...........................................................................................25

Disposal and recycling instructions

2018.01 / g

Electric Power Generation

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 t as standard on A50

to A54 alternators. It can be supplied with

power either by a power VT, or by the AREP

eld 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

Simplied diagram of a potentiometer: to

adjust the potentiometer, check the actual

position of the potentiometer stop.

Stop

2018.01 / g

Electric Power Generation

Installation and maintenance

R449 revision f

AVRs

3983 en -

1.2.1 - Power supply connection

1.2.1.1 - AREP system

4 x holes Ø 5.8 x

175 x 115 mm

200 mm

140 mm

X2 X1 Z2 E+ E- 0V

110220 380

AREP SYSTEM

Field

Armature

T1 T2 T3

T4 T5 T6

Varistor

5+ 6-

T7 T8 T9

T10 T11 T12

R449

Aux. windings

10 Yellow

11 Red

9 Green

12 Black

STATOR : 6 or 12-wire (marking T1 to T12)

MAIN FIELD

ST5

with LAM without LAM

P5 Excitation

ceiling

ST11

ST2 ST1

knee-point: 65 Hz

open

Response

time

normal

fast

P3 Stability

Tension

Single-phase

detection

R731 Option

3-ph. detection

External potentiometer

for adjusting the voltage

ST4 Option

T.I.

Option S1 S2

according to tension

Quad

droop

ST3

50Hz 60Hz

ST10

13 %

LAM

25 %

Frequency

2018.01 / g

Electric Power Generation

Installation and maintenance

R449 revision f

AVRs

3983 en -

1.2.1.2 - PMG system

4 x holes Ø 5.8 x

175 x 115 mm

200 mm

140 mm

X2 X1 Z2 E+ E- 0V

110220 380

T1 T2 T3

T4 T5 T6

Varistor

5+ 6-

T7 T8 T9

T10 T11 T12

R449

ST5

ST11

ST2 ST1

Tension R731

ST4 Option

T.I.

Option S1 S2

14 15 16

PMG

PMG SYSTEM

Field

Armature

Aux. windings

STATOR : 6 or 12-wire (marking T1 to T12)

MAIN FIELD

with LAM without LAM

Excitation

ceiling

knee-point: 65 Hz

open

Response

time

normal

fast

Stability

Single-phase

detection

Option

3-ph. detection

External potentiometer

for adjusting the voltage

according to tension

Quad

droop

ST3

50Hz 60Hz

ST10

13 %

LAM

25 %

Frequency

2018.01 / g

Electric Power Generation

Installation and maintenance

R449 revision f

AVRs

3983 en -

1.2.1.3 - SHUNT system

4 x trous Ø 5.8 x

175 x 115 mm

200 mm

140 mm

X2 X1 Z2 E+ E- 0V

110220 380

T1 T2 T3

T4 T5 T6

Varistor

5+ 6-

T7 T8 T9

T10 T11 T12

R449

ST5

ST11

ST2 ST1

Tension R731

ST4 Option

T.I.

Option S1 S2

SHUNT SYSTEM

Field

Armature

STATOR : 6 or 12-wire (marking T1 to T12)

MAIN FIELD

with LAM without LAM

Excitation

ceiling

knee-point: 65 Hz

open

Response

time

normal

fast

Stability

Single-phase

detection

Option

3-ph. detection

External potentiometer

for adjusting the voltage

according to tension

Quad

droop

ST3

50Hz 60Hz

ST10

13 %

LAM

25 %

Frequency

2018.01 / g

Electric Power Generation

Installation and maintenance

R449 revision f

AVRs

3983 en -

1.3 - Electrical characteristics

1.3.1 - Operating diagram

DETECTION

SENSING

TENSION

VOLTAGE

STABILITE

STABILITY

STATISME

VOLTAGE DROOP

TENTIOMETRE TENSIO

EXTERIEUR

EXTERNAL V

OLTAGE

POTENTIOMETRE

BORNIER

CONNECTOR J1

SOUS-VITESSE

UNDERFREQUENCY

LIMITE D'EXCITATION

EXCITATION LIMIT

TEMPS

TIME

RESISTANCE

RESISTOR

EXCITATEUR

EXCITER

TRANSISTOR

DE PUISSANCE

POWER TRANSISTOR

LAM ST5 V/Hz

% LAM ST10

65Hz ST11

BORNIER

CONNECTOR J2

BORNIER

CONNECTOR J3

380V

DC ST1

ST2

PID

220V

110V

TI/CT

ST4

3 Ph

60Hz50Hz

ST3

+15V

2018.01 / g

Electric Power Generation

Installation and maintenance

R449 revision f

AVRs

3983 en -

1.3.2 - Detection

The detection is single-phase and is isolated

using an internal transformer.

Sensing VA: 5VA

J1 connector, input voltages:

- Terminals 0-110V:

voltage range from 85 to 130V

- Terminals 0-220V:

voltage range from 170 to 260V

- Terminals 0-380V:

voltage range from 340 to 520V

1.3.3 - Voltage accuracy

The voltage accuracy is +/- 0.5 %Un, steady

state, linear load.

1.3.4 - Voltage adjustment

The voltage is adjusted either using an

internal potentiometer P2, with a voltage

range of +/- 10%Un, or using an external

potentiometer (as an option).

The voltage is minimum when internal

potentiometer P2 has been rotated fully

anti-clockwise.

Connecting the external potentiometer:

- External potentiometer 470Ω 3W:

voltage range +/- 5%Un

- External potentiometer 1kΩ 3W:

voltage range +/- 10%Un

Remove jumper ST4 and connect the

external potentiometer as shown in the

diagram below. If a regulator is built into the

terminal box, remove jumper ST10 from

terminal block C and connect the external

potentiometer.

ST4 J2

ST4

Rhe

Internal External

Voltage setting : ST4

A.F. = Internal

1.3.5 - Power supply

The power can be supplied:

- using 2 independent auxiliary windings

integrated in the alternator stator (AREP

excitation),

- using a single or 3-phase power VT,

- using a single or 3-phase PMG.

The single or 3-phase voltage must not

exceed 240V AC.

1.3.6 - Output power

The output power is 7A 63V under normal

conditions and 15A for 10s under overload

conditions.

1.3.7 - Quadrature droop (1F)

Quadrature droop is achieved using a

parallel operation CT (In/1A, 10VA Cl1).

The voltage droop can be adjusted using

potentiometer P1. The voltage range is

5%Un for Pn PF 0.8.

The quadrature droop is at 0 when

potentiometer P1 has been rotated fully

anti-clockwise.

1.3.8 - Frequency compared with

voltage (without LAM)

100 %

50 Hz 60 Hz Hz

50 Hz

48 Hz

57.5 Hz

60 Hz

Voltage

Bend

U/UN

Frequency

1.3.9 - LAM (Load Acceptance Module)

characteristics

The LAM system is integrated in the

regulator, as standard it is active (ST5 with

bridge). It can be deactivated by removing

the ST5 bridge. It can be adjusted to 13% or

25% by means of the ST10 jumper (factory

setting 15%).

- Role of the “LAM” (Load Acceptance

Module):

On application of a load, the rotation speed

of the generator set decreases. When it

passes below the preset frequency

threshold, the LAM causes the voltage to

drop by approximately 13% or 25% and

2018.01 / g

Electric Power Generation

Installation and maintenance

R449 revision f

AVRs

3983 en -

consequently the amount of active load

applied is reduced by approximately 25% to

45%, until the speed reaches its rated value

again.

Hence the LAM can be used either to reduce

the speed variation (frequency) and its

duration for a given applied load, or to

increase the applied load possible for one

speed variation (turbo-charged engine).

To avoid voltage oscillations, the trip

threshold for the LAM function should be set

approximately 2 Hz below the lowest

frequency in steady state. It is advisable to

use the LAM at 25% for load impacts ≥ 70%

of the genset rated power.

LAM

48 or 57.5 Hz

0.87 U

Voltage

U/f

50 or 60 Hz

fC fN

Voltage

ST5 disconnected

ST3

Underspeed and LAM

1.3.10 - Typical effects of the LAM with a

diesel engine with or without a LAM (U/F

only)

1.3.10.1 - Voltage

0,9

0,8

(U/f)

with

LAM Time

without LAM

1 s 2 s 3 s

Transient voltage drop

1.3.10.2 - Frequency

0.9

0.8

Max speed drop

with

LAM

Time

without

LAM

1 s 2 s 3 s

1.3.10.3 - Power

01 s 2 s 3 s

Time

LAM

Variation in the load

Load on the

shaft (kW)

Load shedding due to "LAM"

1.3.11 - Gradual voltage return function

During load impacts, the function helps the

genset to return to its rated speed faster

thanks to a gradual increase in voltage

according to the principle:

- if the speed drops between 46 and 50 Hz,

the rated voltage follows a fast gradient as

it is restored.

- if the speed drops below 46 Hz, since the

engine needs more help, the voltage

follows a slow gradient as it returns to the

reference value.

Time

Drop N ≤ 46 Hz

Drop N > 46 Hz

1.3.12 - Stability

The stability and the response time of the

alternator can be adjusted using

potentiometer P3.

Presetting P3 for different types of

alternator:

5 A50

A53

A54 A51/52

The ST2 jumper modies the stability. It is

closed as standard. Removing this jumper

can in some cases improve the response

time of the alternator (contact the factory).

1.3.13 - Limiting the excitation current

iex

- The potentiometer P5 is used to adjust the

limitation of excitation Amp. Limitation of the

excitation current is active for 10s. After this

period of time, the excitation current is

limited to 2A.

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