Leroy-Somer R 251 Mode d’emploi

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4092 en - 11.2006 / a

R251

A.V.R.

Installation and maintenance

R 251

110

E+ E-

60Hz

65Hz

57Hz

47.5Hz

50Hz

KNEE

SPECIAL

LAM

OFF

13%

25%

LAM

KNEE

LAM OFF

ST4 Option

FREQ. & L.A.M. CONFIG.

VOLTSTAB

Slow fuse

250V 8 A

Voltage

Stability

External potentiometrer

for voltage adjusting

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Installation and maintenance

R251

A.V.R.

LEROY-SOMER 4092 en - 11.2006 / a

SAFETY MEASURES

Before using your machine for the first 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

qualified 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.

This A.V.R. is incorporated in a machine

marked CE.

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.

Note : LEROY-SOMER reserves the right

to modify the characteristics of its products

at any time in order to incorporate the latest

technological developments.

The information contained in this document

may therefore be changed without notice.

WARNING

This manual concerns the alternator A.V.R. which you have just purchased.

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

following certain important points during installation, use and servicing of your A.V.R.,

you can look forward to many years of trouble-free operation.

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Installation and maintenance

R251

A.V.R.

4092 en - 11.2006 / a

LEROY-SOMER

SUMMARY

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

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

2 - R251 A.V.R. .......................................................................................................................5

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

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

2.3 - R251 A.V.R. option......................................................................................................5

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

2.5 - Typical effects 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

Any maintenance or breakdown operations on the A.V.R. are to be done by personnel

trained on commisioning, servicing and maintenance for the electrical and mechanical

elements.

This document is the property of:

MOTEURS LEROY SOMER.

It may not be reproduced in any form without prior authorization

All brands and models have been registered and patents applied for.

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Installation and maintenance

R251

A.V.R.

LEROY-SOMER 4092 en - 11.2006 / a

1 - SUPPLY

1.1 - SHUNT excitation system

The SHUNT excitation alternator is auto-

excited with a R 251 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 R 251 is a R 250 with a specific

excitation 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 T3

Varistor

5+ 6-

STATOR : 4 wires (marking T1 to T4)

R 251

110

E+ E-

60Hz

65Hz

57Hz

47.5Hz

50Hz

KNEE

SPECIAL

LAM

OFF

13%

25%

LAM

KNEE

LAM OFF

ST4

Option

FREQ. & L.A.M. CONFIG.

VOLTSTAB

MAIN FIELD

Field

Induced

Frequency selector 50 Hz

/ 60 Hz for U/F fonction

and LAM adjustement

Slow fuse

250V 8 A

Voltage

Stability

External potentiometrer

for voltage adjusting

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Installation and maintenance

R251

A.V.R.

4092 en - 11.2006 / a

LEROY-SOMER

2 - R251 A.V.R.

2.1 - Characteristics

- Voltage regulation: around ± 0,5 %.

- Supply range/voltage detection 85 to 139 V

(50/60Hz).

- Rapid response time (500 ms) for a

transient voltage variation amplitude of

± 20 %.

- Voltage setting P1.

- Stability setting P2.

- Supply protected with an 8 A fuse, slow

action (supports 10 A for 10 s).

2.2 - U/F Fonction and LAM

The threshold position (50 Hz - 60 Hz) to

action the U/F fonction 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 fonction

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.

Specific 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

specified before ordering, during the

project study.

9: threshold at 47.5 Hz without LAM for

speed variations at a steady state > 2 Hz

2.3 - R251 A.V.R. option

Wireless potentiometer for voltage setting,

1000 Ω/ 0,5 W min: setting range ± 5 %.

- Remove the ST4 jumper.

60Hz

65Hz

57Hz

47.5Hz

50Hz

KNEE

SPECIAL

LAM

OFF

13%

25%

LAM

KNEE

LAM OFF

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Installation and maintenance

R251

A.V.R.

LEROY-SOMER 4092 en - 11.2006 / a

2.4 - LAM characteristics (Load

Acceptance Module)

2.4.1 - Voltage drop

The LAM system is integrated in the A.V.R.

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 46 Hz 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.

LAM

48 or 58 Hz

,85 UN

Voltage

U/f

50 or 60 Hz

fC fN

Voltage

ST3

Tim

Drop N < 46 Hz

Drop N > 46 Hz

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Installation and maintenance

R251

A.V.R.

4092 en - 11.2006 / a

LEROY-SOMER

2.5 - Typical effects 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 Tim

without LAM

1 s 2 s 3 s

Transient voltage drop

Max speed drop

with

LAM

Tim

without

LAM

1 s 2 s 3 s

01 s 2 s 3 s

Tim

LAM

Load variation

Load on

shaft (kW)

Shedding due to "LAM"

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Installation and maintenance

R251

A.V.R.

LEROY-SOMER 4092 en - 11.2006 / a

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 different settings made during the

trial are to be done by qualified

personnel. Respecting the load speed

specified 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 A.V.R.

3.2.1 - R251 settings (SHUNT system)

Initial potentiometer positions

- voltage setting potentiometer P1 for the

A.V.R.: 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 A.V.R. 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:

A.V.R. damage will occur.

3.2.2.1 - R251 field weakening (SHUNT)

The exciter is switched off by disconnecting

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

Contact rating: 16A - 250V AC

3.2.2.2 - R251 field forcing

The battery must be isolated from the

mass.

Exciter field may be at line potential.

WARNING

E+

E-

110

Battery (B Volt)

(400V - 10A)

Excitation Inducer

Diode

E+

E-

110

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Installation and maintenance

R251

A.V.R.

4092 en - 11.2006 / a

LEROY-SOMER

3.3 - Electrical faults

Warning: after setting-up or trouble-

shooting, replace all access panels or

covers.

Fault Action Effect 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 starts up and its

voltage is still correct when the

battery is removed.

- Lack of residual magnetism

The alternator starts up but its

voltage does not reach the rated

value when the battery is

removed.

- Check the connection of the voltage

reference to the A.V.R.

- Faulty diodes

- Induced short circuit

The alternator starts up but its

voltage disappears when the

battery is removed

- Faulty A.V.R.

- Exciter field short-circuited

- Short-circuit in the main field. Check the

resistance

Voltage too

low

Check the drive speed

Correct speed

Check the A.V.R. connections (A.V.R. may

be faulty)

- Field windings short-circuited

- Rotating diodes burnt out

- Main field winding short-circuited

- Check the resistance

Speed too low

Increase the drive speed

(Do not touch the A.V.R. pot (P1) before

returning to the correct speed.)

Voltage too

high

Adjust A.V.R.

potentiometer

Adjustment ineffective - Faulty A.V.R.

- 1 faulty diode

Voltage

oscillations

Adjust A.V.R. stability

potentiometer

- Check the speed: possibility of cyclic

irregularity

- Loose terminals

- Faulty A.V.R.

- Speed too low on load

(or U/F gradient 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 A.V.R.

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

high)

- Faulty rotating diodes

- Short-circuit in the main field. Check the

resistance

- Faulty induced excitaion

(*) Warning: For single-phase operation, check that the sensing wires coming from the A.V.R. are correctly connected to

the operating terminals (see the alternator manual).

Voltage

disappears

during

operation

Check the A.V.R., 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 induced excitation

- Faulty A.V.R.

- Main field open circuit or short-circuited

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Installation and maintenance

R251

A.V.R.

LEROY-SOMER 4092 en - 11.2006 / a

4 - SPARE PARTS

4.1 - Designation

4.2 - Technical support service

Our technical support service will be

pleased to help you with any information

needed.

For replacement part orders, it is necessary

to indicate the type and the code number of

the A.V.R.

Please contact your usual correspondant.

An extensive network of service centres is

available to rapidly supply any necessary

parts.

In order to ensure the correct operation and

safety of our machines, we strongly

recommend that original manufacturer’s

spare parts are used.

Failure to do so, will discharge the

manufacturer from liabilty in the case of

damage.

Description Type Code

A.V.R. R 251 AEM 110 RE 021

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