CEA 4001 - Page 70

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70

When

the

engine

starts

the

starter

motor

pinion

shall

withdraw

from

the

flywheel

gear

ring

automatically

by means

initiated

by

an

electro-mechanical

speed

sensor.

Pressure

switches,

for

example

on

the

engine

lubrication

system

or

water

pump

outlet,

shall

not

be

used

as

a

means

of

de-energising

the

starter

motor.

Centrifugal

speed

switches

or

voltage

generators

used

for

sensing

shall

have

a

direct

coupling

to,

or

be

gear-

driven

by,

the

engine;

flexible

drives

shall

not

be

used.

9.9.8 Engine starter batteries

Engine

starter

batteries

and

chargers

shall

be

as

follows:

Two

separate

battery

power

supplies

shall

be

provided

and

shall

be

used

for

no

other

purpose.

Batteries

shall

be

either

open

nickel-cadmium

prismatic

rechargeable

cells

complying

with

IEC

623

or

lead

acid

positive

batteries

complying

with

the

appropriate

IEC

standards.

The

electrolyte

for

lead

acid

batteries

shall

comply

with

the

appropriate

IEC

standards.

Batteries

shall

be

selected,

used,

charged

and

maintained

in

accordance

with

the

requirements

of

these

specifications

and

with

any

manufacturer's

instructions.

A

hydrometer,

suitable

for

checking

the

density

of

the

electrolyte,

shall

be

provided.

9.9.9 Battery chargers

Each

starter

battery

shall

be

provided

with

an

independent,

continuously

connected,

fully

automatic,

constant

potential

charger.

It

shall

be

possible

to

remove

either

charger

while

leaving

the

other

operational.

Chargers

for

lead

acid

batteries

shall

provide

a

float

voltage

of

2,25V

±

0,05V

per

cell.

The

nominal

charging

voltage

shall

be

suitable

for

local

conditions

(climate,

regular

maintenance,

etc.).

A

boost

charge

facility

shall

be

provided

for

charging

to

a

higher

voltage

not

exceeding

2,7V

per

cell.

The

charger

output

shall

be

between

3,5%

and

7,5%

of

the

10h

capacity

of

the

battery.

Chargers

for

open

nickel-cadmium

prismatic

batteries

shall

provide

a

float

voltage

of

1,445V

±

0,025V

per

cell.

The

nominal

charging

voltage

shall

be

suitable

for

local

conditions

(climate,

regular

maintenance,

etc.).

A

boost

charge

facility

shall

be

provided

for

charging

to

a

higher

voltage

not

exceeding

1,75V

per

cell.

The

charger

output

shall

be

between

25%

and

167%

of

the

5h

capacity

of

the

battery.

9.9.10 Siting of batteries and chargers

Batteries

shall

be

mounted

on

stands

or

stillages.

NOTE:

the

chargers

may

be

mounted

with

the

batteries.

Batteries

and

chargers

should

be

located

in

readily

accessible

positions

where

the

likelihood

of

contamination

by

oil

fuel,

damp,

pump

set

cooling

water,

or

of

damage

by

vibration

is

minimal.

The

battery

should

be

as

close

as

possible

to

the

engine

starter

motor,

subject

to

the

above

constraints,

in

order

to

minimise

voltage

drop

between

the

battery and

starter

motor

terminal.

9.9.11 Starter alarm indication

The

following

conditions

shall

each

be

indicated

both

locally

and

at

a

responsibly

manned

location

by

both

a

red

warning

light

and

an

audible

alarm:

a)

the

use

of

any

switch

which

prevents

the

pump

starting

automatically;

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