Emerson Leroy Somer R250 Instruction Manual

R250

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

A.V.R.

R250

Installation and maintenance

2016.05 / e

Electric Power Generation Installation and maintenance

R250

A.V.R.

4067 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 recommen-

dations 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 less than 28 Hz for more than

30 seconds with an analogic regulator,

the AC power must be disconnected.

WARNING

This A.V.R. can be incorporated in a

machine marked C.E.

This manual is be given to the end user.

characteristics of its products at any time in

order to incorporate the latest technological

developments. The informa-tion 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.

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.

2016.05 / e

Electric Power Generation Installation and maintenance

R250

A.V.R.

4067 en -

SUMMARY

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

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

2 - R250 A.V.R. ........................................................................................................................5

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

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

2.3 - R250 A.V.R. option .......................................................................................................6

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

Disposal and recycling instructions

The R250 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).

2016.05 / e

Electric Power Generation Installation and maintenance

R250

A.V.R.

4067 en -

1 - SUPPLY

1.1 - SHUNT excitation system

The SHUNT excitation alternator is auto-

excited with a R250 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.

4 x holes Ø 5.8 x

50 x 115 mm

140 mm

75 mm

SHUNT SYSTEM

Field

Induced

T1 T2 T3

T4 T5 T6

Varistor

5+ 6-

T7 T8 T9

T10 T11 T12

STATOR : 12 wires (marking T1 to T12)

MAIN FIELD

R250

VOLT

FREQ. & L.A.M. CONFIG.

STAB

Slow fuse

250V 8 A

Voltage

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

2016.05 / e

Electric Power Generation Installation and maintenance

R250

A.V.R.

4067 en -

2 - R250 A.V.R.

2.1 - Characteristics

- Storage: -55°C; +85°C

- Operation: -40°C; +70°C

- 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.

- 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 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.

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

60Hz

65Hz

57Hz

47.5Hz

50Hz

KNEE

SPECIAL

LAM

OFF

13%

25%

LAM

KNEE

LAM OFF

2016.05 / e

Electric Power Generation Installation and maintenance

R250

A.V.R.

4067 en -

2.3 - R250 A.V.R. option

Potentiometer for voltage setting, 1000 W/

0,5 W min: setting 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 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

0,85 U

Voltage

U/f

50 or 60 Hz

fC fN

Voltage

ST3

Time

Drop N < 46 Hz

Drop N > 46 Hz

2016.05 / e

Electric Power Generation Installation and maintenance

R250

A.V.R.

4067 en -

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 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"

2016.05 / e

Electric Power Generation Installation and maintenance

R250

A.V.R.

4067 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 different 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 A.V.R.

3.2.1 - R250 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 - R250 eld 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

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 - R250 eld forcing

The battery must be isolated from the

mass.

Exciter eld may be at line potential.

WARNING

E+

E-

110

Battery (B Volt)

(400V - 10A)

Excitation Inducer

Diode

E+

E-

110

2016.05 / e

Electric Power Generation Installation and maintenance

R250

A.V.R.

4067 en -

3.3 - Electrical faults

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 eld short-circuited

- Short-circuit in the main eld. 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 eld 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 eld. 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 eld open circuit or short-circuited

Warning: after setting-up or trouble-

shooting, replace all access panels or

covers.

2016.05 / e

Electric Power Generation Installation and maintenance

R250

A.V.R.

4067 en -

4 - SPARE PARTS

4.1 - Designation

Description Type Code

A.V.R. R250 AEM 110 RE 019

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.

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