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2017.09 / f

Electric Power Generation

16

Installation and maintenance

TAL 046

Low Voltage Alternators - 4 pole

5377 en -

4.5 - 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 

F1 and F2, 

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 field 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 field coil short-circuited (check the 

resistance)

Speed too low

Increase the drive speed (do not touch the AVR 

voltage pot. before running at the correct 

speed)

Voltage too 

high

Adjust AVR voltage

potentiometer

Adjustment ineffective

Faulty AVR

Voltage

oscillations

Adjust the

AVR stability

potentiometer

- Check the speed: possibility of cyclic 

irregularity

- Loose connections

- Faulty AVR

- Speed too low when on load

Voltage 

correct at no 

load and too 

low when on

load

Run at no load and 

check the voltage 

between F1 and F2 

on the AVR

Voltage between F1 and F2 

(DC)

SHUNT / AREP / PMG < 10V

- Check the speed

Voltage between F1 and F2

SHUNT / AREP / PMG > 15V

- Faulty rotating diodes

- Short-circuit in the revolving field coil (check 

the resistance)

- Faulty exciter armature (check the resistance)

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 field coil open circuit or short-

circuited

Summary of Contents for Leroy Somer TAL 046

Page 1: ...TAL 046 Low Voltage Alternators 4 pole Installation and maintenance Three phase 6 and 12 wire...

Page 2: ...tention to the following 2 safety measures which must be complied with a During operation do not allow anyone to stand in front of the air outlet guards in case anything is ejected from them b Do not...

Page 3: ...Assembly 9 3 2 Checks prior to first use 9 3 3 Terminal connection diagrams 10 3 4 Commissioning 13 3 5 Setting up 13 4 SERVICING MAINTENANCE 14 4 1 Safety measures 14 4 2 Routine maintenance 14 4 3 B...

Page 4: ...transporter you may be able to claim on their insurance and after a visual check turn the machine by hand to detect any malfunction 1 3 Identification The alternator is identified by means of a namep...

Page 5: ...d ball bearings greased for life Mounting arrangements single bearing withstandardfeetandSAEflanges coupling discs Drip proof machine self cooled Degree of protection IP 23 SHUNT three phase 6 wire 2K...

Page 6: ...W6 T2 V1 T5 V2 T8 V5 T11 V6 3 PH A D F T8 T11 1 PH FF G T1 T4 T8 T11 R250 R791T T1 Y T2 T3 T1 3 PH T2 T3 N L 1 PH L M EXCITER MAIN FIELD Armature Exciter field Varistor Rotating rectifiers STATOR 12 w...

Page 7: ...xciter field Rotating rectifiers Varistor STATOR 12 wire T1 to T12 identification black yellow green red Auxiliary windings OPTIONAL Black Black Black Blue Green Yellow External remote voltage trimmer...

Page 8: ...MAIN FIELD Armature Exciter field Rotating rectifiers Varistor STATOR 12 wire T1 to T12 identification OPTIONAL Black Black Black Blue Green Yellow External remote voltage trimmer remove ST For anti c...

Page 9: ...a lifting system which respects the integrity and the environment of the machine During this operation do not allow anyone to stand under the load Double bearing coupling Semi flexible coupling Carefu...

Page 10: ...defined environmental conditions Mechanical checks Before starting the machine for the first time check that all fixing bolts are tight the length of bolt and the tightening torque are correct the coo...

Page 11: ...s Factory connection AREP or PMG three phase 6 wire 6 S 8 S 60 Hz 50 Hz 220 240 220 240 220 240 6 S 8 S 60 Hz 50 Hz 380 415 380 480 380 416 F 1PH 3PH T1 T4 T3 T6 T5 T2 L1 U L3 W L2 V D 3PH L1 U L3 W L...

Page 12: ...3 T2 T8 T1 T5 T11 T12 T6 T4 W 3 L3 V 2 L2 U 1 L1 T3 T11 T2 T1 T7 T10 T12 T4 T8 T5 T9 T6 L1 U N L3 W T1 T7 T12 T10 T4 T9 T3 T6 T11 T5 T2 T8 L2 V A 3PH 60 Hz 50 Hz 190 208 190 240 190 208 6 8 R250 0V T8...

Page 13: ...ernator earth terminal inside the terminal box is connected to the electrical earth circuit The earth terminal is connected to the frame The connections inside the terminal box must never be subjected...

Page 14: ...electrical connections in the installation Electrical servicing Commercially available volatile degreasing agents can be used Do not use trichlorethylene perchlo rethylene trichloroethaneoranyalkalin...

Page 15: ...ator frame more than 40 C above the ambient temperature Air flow inlet outlet partially clogged or hot air is being recycled from the alternator or engine Alternator operating at too high a voltage 10...

Page 16: ...ings short circuited Rotating diodes burnt out Revolving field coil short circuited check the resistance Speed too low Increase the drive speed do not touch theAVR voltage pot before running at the co...

Page 17: ...tery Rh 50 300W ASSEMBLY A Field Assembly B Connect a Variac variable power supply and a diode bridge on both exciter field wires 5 and 6 Both these systems should have characteristics which are compa...

Page 18: ...diodes change the diode bridges if necessary Access to connections and the regulation system Access directly by removing the top of the cover 48 Replacing the NDE bearing Remove the box lid 48 the ND...

Page 19: ...on of the rotor be careful not to damage the fan 15 or dismantle it Remove the rotor on special V shaped supports When dismantling the rotor involves changing parts or rewinding the rotor must be reba...

Page 20: ...2 wire Resistances at 20 C Type Stator L N Rotor Exciter field Exciter armature A 0 023 0 51 14 42 0 033 B 0 023 0 51 14 42 0 033 C 0 020 0 54 9 55 0 098 D 0 020 0 54 9 55 0 098 E 0 011 0 65 11 10 0 0...

Page 21: ...ower supply is present when the machine has stopped Connection accessories 6 wire machines coupling F 12 wire machines coupling A F F F 5 2 Technical support service Our technical support service will...

Page 22: ...2017 09 f Electric Power Generation 22 Installation and maintenance TAL 046 Low Voltage Alternators 4 pole 5377 en 5 4 Exploded view parts list and tightening torque Single bearing SHUNT or AREP...

Page 23: ...4 1 Panel fixing M6 10 31 6 Fixing bolts 198 1 Voltage regulator AVR 33 1 Protective guard M6 6 199 1 Interference suppression module RFI kit 36 1 Non drive end NDE shield M12 75 279 6 8 Connection ba...

Page 24: ...ng processes Our technical support depar tment can provide detailed directions on products dismounting upon request Waste hazardous materials The following components and materials need a special trea...

Page 25: ...nufactured by Leroy Somer or on Leroy Somer s behalf comply with the following International Standards and Directive EN and IEC 60034 1 60034 5 and 60034 22 ISO 8528 3 Reciprocating internal combustio...

Page 26: ...2017 09 f Electric Power Generation 26 Installation and maintenance TAL 046 Low Voltage Alternators 4 pole 5377 en...

Page 27: ...ntee for fast and efficient repair support and maintenance services Trust your alternator maintenance and support to electric power generation experts Our field personnel are 100 qualified and fully t...

Page 28: ...2017 09 f www leroy somer com epg 5377 en Linkedin com company Leroy Somer Twitter com Leroy_Somer_en Facebook com LeroySomer Nidec en YouTube com LeroySomerOfficiel...

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