DAF LF45, LF55 Series. Manual - part 385

1

1427090/03

EL001557

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1000

1000

1000

1000

1008

4176

3173

1167

1127

1167

BN

BW

BN

BW

1167

1167

1008

1167

1167

1167

4179

1167

4178

4178

4176

9036

4176

4174

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4175

1009

1009

1167

1167

4176

9036

4176

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4177

4176

4179

4179

1123

9303

1123

9303

9001

4179

4179

1357

4179

1357

1357

1357

1357

1357

4178

A500

1/705

2/705

B525

A1/

752

A5/

752

D900

E1/

747

E349

80A

2

1

A3

718

4

822

A1

718

3

822

7

822

3

834

5

822

E330

5A

2

1

E153

10A

2

1

G367

88

88A

85A

85B

86

G368

88

88A

85A

85B

86

C853

5

71

0I

C854

1

2

!

!

!

!

!

!

!

!

!

!

!

A5

A7

C2

C5

C4

A2

C1

A3

A4

A1

D924

G425

30

85

86

87A

87

2

822

1

834

2

834

2

832

1

832

6

822

8

822

1

833

2

833

D826

+

4

2

3

1

831

4

902

2

831

3

A513

3

B6/702

D942

1000

1000

1010

1010

E143

10A

200440



2-29

5

ELECTRICAL SYSTEM

Electrical system

series

45/55

LF

2.

IGNITION/ST

ARTER

SWITCH/CHARGING

C

IRCUIT

CONT

ACT

CIRCUIT

When

ignition/starter

switch

C

841

is

turned

to

the

“accessories”

position

(contact

1

connected

to

contact

6),

the

“accessories”

relay

(G355)

is

energised

via

wire

1130.

If

ignition

switch

C841

is

turned

further

(contact

1

is

connected

to

4),

ignition

relay

G015

will

be

activated

via

wire

4001.

Wire

1010

is

supplied

w

ith

power

.

ST

ARTING

C

IRCUIT

When

the

contact

switch

is

turned

to

the

“start”

position,

contacts1

and

2

in

this

switch

are

connected.

Power

is

supplied

to

relay

G203

via

w

ire

4002.

The

V

IC

(D900)

connects

G203

to

earth

when

the

neutral

position

switch

(E569)

in

the

gearbox

is

closed.

Relay

G203

now

supplies

power

via

w

ire

4009

to

connection

point

50

of

the

starter

motor

(B010).

A

s

a

result,

the

starter

m

otor

is

energised. This

means

that

if

the

gearbox

is

not

in

neutral

the

V

IC

does

not

connect

relay

G203

to

earth

and

the

relay

is

therefore

not

energised.

CHARGING

C

IRCUIT

When

the

ignition

is

switched

on,

power

is

supplied

to

both

the

B+

connection

and

connection

15

(pin

3)

of

the

alternator

.

An

internal

resistor

in

the

alternator

is

energised

by

an

IC

in

the

carbon

brush

holder

.

This

resistor

ensures

that

a

low

level

of

current

passes

through

the

energising

resistor

.T

his

excites

a

magnetic

field

in

the

alternator

.

After

starting,

the

voltage

on

terminals

B

+

and

15

(pin

3)

will

rise

to

about

28.5

V.

O

nce

this

voltage

is

reached,

the

control

IC

in

the

regulator

interrupts

the

pre-exciter

coil

to

enable

the

voltage

to

be

regulated.

The

magnetic

field

w

ill

now

disappear

,s

o

that

the

generator

will

not

be

energised

for

a

short

period

of

time.

As

a

result,

the

voltage

on

outputs

B

+

and

15

will

drop.

The

regulator

reactivates

w

hen

the

voltage

drops

below

27.6

V.

T

his

m

eans

that

the

voltage

supplied

by

the

generator

remains

relatively

constant.

T

he

batteries

are

supplied

through

generator

output

B+1.

The

alternator

charging

current

warning

lamp

is

activated

via

wire

1020,

which

is

connected

to

the

V

IC

(D900).

T

he

VIC

controls

the

D

IP

via

the

CAN

network.

T

he

voltage

on

wire

1020

is

switched

by

the

control

IC.

Errors

are

also

shown

on

the

DIP

display

through

this

connection.

The

alternator

is

also

equipped

with

a

‘sens’

connection

(pin

4).

H

owever

,t

his

connection

is

not

used

and

is

now

connected

directly

to

B+2.

The

function

of

this

connection

is

to

correct

the

voltage

dif

ference

between

B+

and

the

batteries.

200440



2-30

5

ELECTRICAL SYSTEM

Electrical system

series

45/55

LF

2

1427090/03

EL001559

1

2

3

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26

27

28

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31

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34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

51

52

53

1000

4009

4002

1000

4002

1000

4173

1211

4001

1000

1000

1000

1000

1000

1000

1211

1020

4009

1000

4009

1211

1020

4721

1211

1020

1020

4721

4721

1211

G014

1

5

1000

1000

1000

1130

4001

1211

A500

50

30

B010

M

31

1

730

5

768

4

720

B3

714

3

858

8

720

1/705

2/705

1/704

B12/702

B8/703

A5/701

A11/702

A10/702

G525

G525

4

768

2

858

B1

718

C51/

745

D900

D29/

746

C20/

745

D903

B39/

757

E349

80A

2

1

E286

125A

2

1

D942

1000

1010

4173

4001

G203

32

1

4

G015

3

1

24

M

1010

1000

E035

10A

G355

1

18

C841

1/808

2/808

4/808

6/808

E569

2

4

G

3

B+1

L /2

B-

+15 /3

S /4

A513

B+2

G520

200440



2-31

5

ELECTRICAL SYSTEM

Electrical system

series

45/55

LF

3.

TACHOGRAPH

SEE

THE

SYSTEM

MANUAL

FOR

M

ORE

INFORMA

T

ION

Location 19

Electronic

unit,

ECAS-3

(D851):

If

ECAS-2

fitted,

then

electronic

unit

D

802

200440



2-32

5

ELECTRICAL SYSTEM

Electrical system

series

45/55

LF