Ariens 936022 (Sierra 1340G) Servisní příručka stáhnout pdf (Strana 42)

11 - 42

Voltage Measurement

A voltmeter measures the voltage difference between

the test leads and the voltmeter is always connected

across the circuit under test.

Current Measurement

The rules to remember when measuring current with

an ammeter are; an ammeter measures the current

that flows through the meter, and to measure current

an ammeter must be connected into the circuit.

The latter rule means that the circuit must be opened,

and the ammeter wired into it. Because this procedure

is usually difficult, an ammeter is seldom used for trou-

bleshooting.

Resistance Measurement

An ohmmeter is used to make resistance measure-

ments and to check continuity through wires and elec-

trical components.

The ohmmeter has a self contained battery and

requires no electrical power. Using the ohmmeter on a

circuit that has power applied may result in damage to

the meter.

IMPORTANT:

Disconnect the equipment battery when

making Ohmmeter test or damage to the Ohmmeter

may result.

IMPORTANT:

An ohmmeter reads the resistance of

whatever component is connected between the test

leads. It can be used to check wires, coils, light bulbs,

or any item that conducts current.

11.3 BATTERY

Set-Up:

The battery is dry charged. The dealer or customer

must add electrolyte (sulfuric acid and water).

1. Remove the battery from the unit.

2. Remove all the vent caps from the battery and set

the caps to one side.

3. Take the electrolyte which should be 1.265 specific

gravity at 80

F (27

C), and fill each cell so that the

electrolyte is level with the bottom of the fill ring.

4. The battery should stand for 1/2 hour. Now check

electrolyte level in each cell again. If necessary

add more electrolyte to bring the level up to the

bottom of the ring.

5. Charge until all cells are gassing freely, and the

specific gravity is constant over three successive

readings taken at 30 minute intervals.

6. Immediately after charging, check level of

electrolyte. If the level is low add distilled water to

bring it up to the required level.

7. Replace the vent caps. It is not necessary to

tighten more than finger tight.

8. Wash off the battery to remove electrolyte which

may have spilled.

Maintenance:

Do an occasional visual inspection. See to it that the

battery remains clean, both the case and the terminals.

This visual inspection should be done once a month.

Check the level of the electrolyte. It may be necessary

to add distilled water. This should be checked before

each usage.

Another important check is the specific gravity. The

specific gravity should be checked with the hydrometer.

The reading on the gauge should be above 1.225. If

the reading is allowed to fall below 1.225 specific

gravity you will have an insufficient charge. If this

happens charge the battery until specific gravity of

1.265 is reached over 3 successive readings. This

check should be done monthly.

The state of charge can be determined approximately

by the cell specific gravity or the rested open circuit

voltage at room temperature and the charging time can

be estimated. For example:

If using an automatic tapering 12 volt charger, choosing

a good quality 5 to 10 amps 15VDC minimum output

charger and charge for 3 to 12 hours according to the

battery state of charge (see table above) or until the

specific gravity in each cell reaches 1.255 - 1.265

specific gravity at 80

F (27

C).

If using a constant current charger, charge at 1 to 2

amperes for the time given on the table above or until

full specific gravity is reached.

IMPORTANT:

Charging at higher rates will damage the

battery and cause excessive gassing and acid

spewing.

OCV Specific

Gravity

% of

Charge

Charging

Time

12.60 1.265 100% ---

12.40 1.225 75% 3 hours

12.20 1.180 50% 7 hours

12.00 1.130 25% 10 hours

11.80 1.100 0% 12 hours

WARNING:

When charging battery, remove it

from the unit and make certain that you

connect the positive (+) lead of the charger to

the positive (+) terminal and the negative (-)

lead to the negative (-) terminal. Reverse

connections can cause sparks and potential

unsafe conditions.

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