Generac Power Systems 5411, 5412, 5413, 5415, 5414 Amp Fuse, Start-Stop Switch, 4. - Typical Fuse

Section 5

ENGINE DC CONTROL SYSTEM

cold weather starting, voltage drop between the bat- tery and starter should not exceed 0.12 volt per 100 amperes of cranking current.

Select the battery cables based on total cable length and prevailing ambient temperature. Generally, the longer the cable and the colder the weather, the larger the required cable diameter.

The following chart applies:

CABLE LENGTH (IN FEET)	RECOMMENDED CABLE SIZE
0-10	No. 2
11-15	No. 0
16-20	No. 000

EFFECTS OF TEMPERATURE:

Battery efficiency is greatly reduced by a decreased electrolyte temperature. Such low temperatures have a decided numbing effect on the electrochemical action. Under high discharge rates (such as cranking), battery voltage will drop to much lower values in cold temperatures than in warmer temperatures. The freez- ing point of battery electrolyte fluid is affected by the state of charge of the electrolyte as indicated below:

SPECIFIC GRAVITY	FREEZING POINT
1.220	-35° F. (-37° C.)
1.200	--20° F. (-29° C.)
1.160	0° F. (-18° C.)

ADDING WATER:

Water is lost from a battery as a result of charging and discharging and must be replaced. If the water is not replaced and the plates become exposed, they may become permanently sulfated. In addition, the plates cannot take full part in the battery action unless they are completely immersed in electrolyte. Add only DISTILLED WATER to the battery. DO NOT USE TAP WATER.

NOTE: Water cannot be added to some “mainte- nance-free” batteries.

CHECKING BATTERY STATE OF CHARGE:

Use an automotive type battery hydrometer to test the battery state of charge. Follow the hydrometer manufacturer’s instructions carefully. Generally, a bat- tery may be considered fully charged when the spe- cific gravity of its electrolyte is 1.260. If the hydrometer used does not have a “Percentage of Charge” scale, compare the readings obtained with the following:

SPECIFIC GRAVITY	PERCENTAGE OF CHARGE
1.260	100%
1.230	75%
1.200	50%
1.170	25%

CHARGING A BATTERY:

Use an automotive type battery charger to recharge a battery. Battery fluid is an extremely corrosive, sulfuric

acid solution that can cause severe burns. For that reason, the following precautions must be observed:

❏The area in which the battery is being charged must be well ventilated. When charging a battery, an explosive gas mixture forms in each cell.

❏Do not smoke or break a live circuit near the top of the battery. Sparking could cause an explosion.

❏Avoid spillage of battery fluid. If spillage occurs, flush the affected area with clear water immediately.

❏Wear eye protection when handling a battery.

7.5 Amp Fuse

This panel-mounted Fuse protects the DC control circuit against overload and possible damage. If the Fuse has melted open due to an overload, neither the priming function nor the cranking function will be available.

Figure 5-4. – Typical Fuse

Start-Stop Switch

The Start-Stop Switch allows the operator to control cranking, startup and shutdown. The top half of this momentary switch is pushed and held for one (1) sec- ond and then released. An indicator light on the switch begins to flash. The fuel pump engages automatically for a three (3) to five (5) second delay before the start- er motor cranks the engine for 16 seconds or until the engine starts. If the engine does not start, the starter will cool for seven (7) seconds and crank the engine again for 16 seconds. If the engine does not start, the starter will cool for seven (7) seconds before cranking for seven (7) seconds to a maximum cycle total of 90 seconds. Once started, the light on the switch stays on continuously. If the generator does not start at the end of the start sequence, a fault code will flash on the switch (see Diagnostics).

The switch center position is the RUN position.

A running engine is stopped by momentarily pressing the bottom half of the switch to kill the ignition.

The following wires connect to the Start-Stop Switch:

1.Wire No. 17 from the Printed Circuit Board. This Is the CRANK and START circuit. When the Switch is set to “START”, Wire 17 is connected to frame ground via Wire 0.

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