Nidec LEROY-SOMER R251 Manual de instrucciones

R251

VOLT

FREQ. & L.A.M. CONFIG.

STAB

110

E+ E-

60Hz

65Hz

57Hz

47.5Hz

50Hz

KNEE

SPECIAL

LAM

OFF

13%

25%

LAM

KNEE

LAM OFF

R251

AVR

Installation and maintenance

2024.01 / g

Electric Power Generation

Installation and maintenance

R251

AVR

4092 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

recommendations 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

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

maintenance 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.

Share Capital: 32,239,235 €, RCS Angoulême

338 567 258.

We reserve the right to modify the 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 authorization.

All brands and models have been registered and

patents applied for.

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

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

2024.01 / g

Electric Power Generation

Installation and maintenance

R251

AVR

4092 en -

CONTENTS

1 - POWER SUPPLY ...............................................................................................................4

1.1 - SHUNT excitation system ............................................................................................4

2 - R251 AVR ...........................................................................................................................5

2.1 - Characteristics .............................................................................................................5

2.2 - U/F function and LAM...................................................................................................5

2.3 - AVR options..................................................................................................................6

2.4 - LAM Characteristics ....................................................................................................6

2.5 - Typical e󰀨ects of the LAM.............................................................................................7

3 - INSTALLATION - COMMISIONING ...................................................................................8

3.1 - Electrical checks on the AVR ........................................................................................8

3.2 - Settings........................................................................................................................8

3.3 - Electrical faults.............................................................................................................9

4 - SPARE PARTS .................................................................................................................10

4.1 - Designation................................................................................................................10

4.2 - Technical support service. ..........................................................................................10

Disposal and recycling instructions

The R251 is an IP00 product. It must be installed inside a unit so that this unit’s cover can

provide IP20 minimum total protection (it must only be installed on our alternators in the

appropriate location so that when viewed externally, it has a higher degree of protection than

IP20).

2024.01 / g

Electric Power Generation

Installation and maintenance

R251

AVR

4092 en -

1 - POWER SUPPLY

1.1 - SHUNT excitation system

The SHUNT excitation alternator is auto-

excited with a R251 voltage regulator.

The regulator controls the excitation current

according to the alternator’s output voltage.

With a very simple conception, the SHUNT

excitation alternator does not have a short

circuit capacity.

The R251 is a R250 with a specic excita-

tion ceiling = 4 A during 30 s (set for the

dedicated single phase alternator with type

M or M1).

4 x holes Ø 5.8 x

50 x 115 mm

140 mm

75 mm

SHUNT SYSTEM

Varistor

5+ 6-

STATOR : 4 wires (marking T1 to T4)

MAIN FIELD

Field

Induced

R251

VOLT

FREQ. & L.A.M. CONFIG.

STAB

Slow fuse

250V 8 A

P1 Voltage

P2 Stability

110

E+ E-

60Hz

65Hz

57Hz

47.5Hz

50Hz

KNEE

SPECIAL

LAM

OFF

13%

25%

LAM

KNEE

LAM OFF

External potentiometrer

for voltage adjusting

ST4 Option

Frequency selector 50 Hz

/ 60 Hz for U/F fonction

and LAM adjustement

2024.01 / g

Electric Power Generation

Installation and maintenance

R251

AVR

4092 en -

2 - R251 AVR

2.1 - Characteristics

- Storage: -55°C; +85°C

- Operation: -40°C; +70°C

- Voltage regulation: around ± 0,5 %

- Supply range/voltage detection 85 to 139V

(50/60Hz).

- Rapid response time (500 ms) for a

transient voltage variation amplitude of ±

20 %.

- Voltage setting P1

- Stability setting P2

- Power supply protected by 8 A fuse,

replacement product: Ferraz-Shawmut

T084013T fast-blow fuse, 8 A FA 250 V,

breaking capacity 30 kA.

2.2 - U/F function and LAM

The threshold position (50 Hz - 60 Hz) to

action the U/F function as well as the LAM

setting type is selected using the

potentionmeter.

WARNING: The jumper settings must

correspond to the rated operating

frequency (see the nameplate on the

alternator).

Risk of destruction for the alternator.

The threshhold position and LAM function

settings are done with the jumper.

Operating at 50 Hz: (U/F gradient)

0: threshold at 48 Hz without LAM for

impacts between 30 and 40% of the rated

load.

1: threshold at 48 Hz with LAM 13% for

impacts between 40 and 70% of the rated

load.

2: threshold at 48 Hz with LAM 25% for

impacts > 70% of the rated load.

Operating at 60 Hz: (U/F gradient)

3: threshold at 58 Hz without LAM for

impacts between 30 and 40% of the rated

load.

4: threshold at 58Hz with LAM 13% for

impacts 40 and 70% of the rated load.

5: threshold at 58Hz with LAM 25% for

impacts > 70% of the rated load.

Specic operating

6: threshold at 57Hz without LAM for speed

variations at a steady state > 2 Hz

7: threshold at 65Hz without LAM for

variable speed and tractelec / gearlec (U/F

gradient).

8: special: the factory setting 48Hz 2U/F

gradient ; a special programme is possible

on request. This programme must be

specied before ordering, during the project

study.

9: threshold at 47.5 Hz without LAM for

speed variations at a steady state > 2 Hz.

For hydraulic applications, it is advisable to

select:

- position 0 for 50 Hz

- position 3 for 60 Hz

60Hz60Hz

65Hz65Hz

57Hz57Hz

47.5Hz47.5Hz

50Hz50Hz

KNEEKNEE

SPECIALSPECIAL

LAMLAM

OFFOFF

13%13%

25%25%

LAMLAM

KNEEKNEE

LAM OFFLAM OFF

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Electric Power Generation

Installation and maintenance

R251

AVR

4092 en -

2.3 - AVR options

Potentiometer for remote voltage

adjustment, 1000 Ω / 0.5 W min: adjustment

range ± 5%.

- Remove the ST4 jumper.

For wiring up the external potentiometer;

the “earth” wires must be isolated as

well as the potentiometer terminals

(wires at the same voltage as the power).

2.4 - LAM characteristics (Load

Acceptance Module)

2.4.1 - Voltage drop

The LAM system is integrated in the AVR It

is active as standard. It can be adjusted to

13% or 25%.

- Role of the «LAM» (Load Adjustment

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

consequently the amount of active load

applied is reduced by approximately 25% to

50%, 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 engines).

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 advised to use the “LAM” at 25% for load

impacts > at 70% of the genset rated power.

2.4.2 - 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 following principles:

- if the speed drops between 46Hz and

50Hz, 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.

LAM

48 or 58 Hz

0,85 U

Voltage

U/f

50 or 60 Hz

fC fN

Voltage

ST3

Time

Drop N < 46 Hz

Drop N > 46 Hz

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Electric Power Generation

Installation and maintenance

R251

AVR

4092 en -

2.5 - Typical e󰀨ects of the LAM with a

diesel engine or without a LAM (U/F

only)

2.5.1 - Voltage

2.5.2 - Frequency

2.5.3 - Power

0,9

0,8

(U/f)

with

LAM Time

without LAM

1 s 2 s 3 s

Transient voltage drop

0,9

0,8

Max speed drop

with

LAM

Time

without

LAM

1 s 2 s 3 s

01 s 2 s 3 s

Time

LAM

Load variation

Load on

shaft (kW)

Shedding due to "LAM"

2024.01 / g

Electric Power Generation

Installation and maintenance

R251

AVR

4092 en -

3 - INSTALLATION -

COMMISSIONING

3.1 - Electrical checks on the AVR

- Check that all connections have been

made properly as shown in the attached

wiring diagram.

- Check that the position of the jumper

corresponds to the operating frequency.

- Check whether the ST4 jumper or the

remote adjustment potentiometer have

been connected.

3.2 - Settings

The di󰀨erent settings made during the

trial are to be done by qualied personnel.

Respecting the load speed specied on

the nameplate is vital in order to start a

settings procedure. After operational

testing, replace all access panels or

covers.

The only possible settings on the

machine are to be done with the AVR.

3.2.1 - R251 settings (SHUNT system)

Initial potentiometer positions

- voltage setting potentiometer P1 for the

AVR: full left

- remote voltage setting potentiometer: in

the middle.

Operate the alternator at its rated speed: if

the voltage does not rise it is necessary to

re-magnatise the magnetic circuit.

- slowly adjust the voltage potentiometer of

the AVR P1 until the output voltage reaches

its rated value.

- Stability setting with P2.

3.2.2 - Special type of use

Excitation circuit E+, E- must not be left

open when the machine is running: AVR

damage will occur.

3.2.2.1 - R251 eld weakening (SHUNT)

The exciter is switched o󰀨 by disconnecting

the AVR power supply (1 wire - 0 or 110V).

Contact rating: 16A - 250V AC.

Do not reclose the power supply until the

voltage has reached a value ≤15% of the

rated voltage (approximately 5 seconds

after opening).

3.2.2.2 - R251 eld forcing

Battery must be isolated from the earth.

Exciter eld may be at line potential.

WARNING

E+

E-

110

Battery (B Volt)

(400V - 10A)

Excitation Inducer

Diode

E+

E-

110

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Electric Power Generation

Installation and maintenance

R251

AVR

4092 en -

3.3 - Electrical faults

Fault Action E󰀨ect Check/Cause

No voltage at

no load on

start-up

Connect a new battery

of 4 to 12 volts to

terminals E- and E+,

respecting the polarity,

for 2 to 3 seconds

The alternator builds up and its

voltage is still correct when the

battery is removed

- Lack of residual magnetism

The alternator builds up but its

voltage does not reach the rated

value when the battery is

removed

- Check the connection of the voltage

reference to the AVR

- Faulty diodes

- Armature short-circuit

The alternator builds up but its

voltage disappears when the

battery is removed

- Faulty AVR

- Field windings open circuit (check

winding)

- Revolving eld coil open circuit (check the

resistance)

Voltage too

low Check the drive speed

Correct speed

Check the AVR connections (AVR may be

faulty)

- Field windings short-circuited

- Rotating diodes burnt out

- Revolving eld coil short-circuited (check

the resistance)

Speed too low

Increase the drive speed (do not touch the

AVR voltage setting before running at the

correct speed)

Voltage too

high

Adjust AVR voltage

potentiometer Adjustment ine󰀨ective - Faulty AVR

- 1 faulty diode

Voltage

oscillations

Adjust AVR stability

potentiometer

- Check the speed : possibility of cyclic

irregularity

- Loose connections

- Faulty AVR

- Speed too low when on load (or U/F bend

set too high)

Voltage

correct at no

load and too

low when on

load (*)

Run at no load and

check the voltage

between E+ and E- on

the AVR

- Check the speed (or U/F bend set too

high)

- Faulty rotating diodes

- Short-circuit in the revolving eld coil

(check the resistance)

- Faulty exciter armature (check the

resistance)

(*) Caution : For single-phase operation, check that the sensing wires coming from the AVR are correctly connected to

the operating terminals.

Voltage

disappears

during

operation

Check the AVR, the

surge suppressor, the

rotating diodes and

replace any defective

components

The voltage does not return to the

rated value

- Exciter winding open circuit

- Faulty exciter armature

- Faulty AVR

- Revolving eld coil open circuit or

short-circuited

Warning: after operational testing, replace all access panels or covers.

2024.01 / g

Electric Power Generation

Installation and maintenance

R251

AVR

4092 en -

4 - SPARE PARTS

4.1 - Designation

Description Type Code

AVR R251 AEM 110 RE 021

4.2 - Technical support service

Our technical support service will be

pleased to provide any additional

information you may require.

For all spare parts orders or technical

support requests, send your request to

service.epg@leroy-somer.com or your

nearest contact, whom you will nd at

www.lrsm.co/support indicating the type

and the code number of the AVR.

To ensure that our products operate correctly

and safely, we recommend the use of

original manufacturer spare parts.

In the event of failure to comply with this

advice, the manufacturer cannot be held

responsible for any damage.

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