Generac Power Systems 005012-1 owner manual Unpacking

Section 1 — General Information

40kW Liquid-cooled Generators

‹1.7.3 LOW COOLANT LEVEL SWITCH

Should engine coolant level drop below the level of the high coolant temperature switch, it is possible for the engine to overheat without automatic shutdown. To prevent such overheating without automatic shut down, the engine has a low coolant level sensor. If the engine coolant drops too low, the engine automatical- ly shuts down and turns on the high coolant tempera- ture/low coolant level LED (Figure 1.6 on page 6).

Figure 1.6 - Low Coolant Level Sensor

‹1.7.4 OVERSPEED SHUTDOWN

The engine control board receives AC frequency signals from an engine run winding in the alterna- tor. Should AC frequency exceed about 72 Hertz for three seconds or 75 Hertz instantaneously, the engine shuts down and the overspeed LED turns on. Should AC frequency exceed about 72 Hertz, circuit board action will automatically shutdown the engine (Figure 1.7).

Figure 1.7 - Printed Circuit Board Assembly

	LED1		R44
		C27	Q2
	C9
2

J2

C26

U7

C4

D10

		C21
C30
	C2
	RL1	RL2
	R1
R25	R48
	D17
R49
	U1
		J1
	L3
	.REV 0E4906 PCB#	D19

‹1.7.5 RPM SENSOR LOSS

If the engine control board does not receive a proper rpm signal from the starter during cranking or run- ning, it shuts down the engine on rpm sensor loss and flashes the overspeed LED.

‹1.7.6 OVERCRANK SHUTDOWN

The engine control board uses a cyclic cranking pro- cess when attempting to start the engine. The first crank cycle is a 15-second crank followed by a seven- second rest. This is followed by five more crank cycles each with a seven-second crank followed by a seven-second rest.

If the engine fails to start after all six attempts, the start attempt is stopped and the overcrank LED turned on.

‹1.7.7 LOW BATTERY

The engine control board continually monitors the battery voltage and turns on the low battery LED if the battery voltage falls below 11.0 VDC for one minute. Low battery voltage is a non-latching alarm, which will automatically clear if the battery voltage rises above 11.0 VDC.

The control system will not attempt to start the engine if there is a low battery condition, however, if the engine is already running when the low battery condition occurs, the engine will continue to run as long as possible.

Battery voltage is NOT monitored during the crank cycle.

‹1.7.8 ALARM RESET

If the engine control board shuts down the genera- tor for any of the above reasons, the engine remains stopped until the alarm is cleared by placing the AUTO/OFF/MANUAL switch into the OFF position.

‹1.7.9 DC FUSE

These fuses are located on the front panel of the con- trol system. They protect the panel wiring and com- ponents from damaging overload. Always remove the 15 amp main fuse before working on the generator. The unit will not start or crank if this fuse is blown. Replace the fuse with one of the same size, type, and rating (main AGC-15, battery charger AG4).

1.8UNPACKING

‹1.8.1 UNPACKING PRECAUTIONS

Handle shipping cartons and crates with care. Use care to avoid damage from dropping, bumping, col- lision, etc..

‹1.8.2 INSPECTION

After unpacking, carefully inspect the generator for any damage that may have occurred during ship- ment. If loss or damage is noted at the time of deliv- ery, have the person(s) making delivery note all dam- age on the freight bill or affix their signature under the consignor’s memo of loss or damage.

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