Generac Power Systems 04456-1, 04390-1, 04389-1 Break-Inprocedure, 3.3AUTOMATIC TRANSFER OPERATION

Section 3 — Operation

Guardian Air-cooled 7 kW, 12 kW and 15 kW Generators

3.1 BREAK-IN PROCEDURE ‹ 3.2.3 “MANUAL” POSITION

Once the unit has been installed and all electrical checks have been made, it is strongly recommended that the following “Break-in Procedure” be completed to ensure correct generator operation in the future.

1. Set the generator’s Auto/Off/Manual switch to

AUTO.

Set the switch to Manual to crank and start the engine. Transfer to standby power will not occur unless there is a utility failure.

Figure 3.1 – Generator Control Panel

2.	Turn OFF the utility power supply to the transfer
	switch using the means provided (such as a utili-
	ty main line circuit breaker).
3.	The unit will start, and the transfer switch will
	transfer to standby.
4.	Using the transfer switch’s built-in emergency
	load center, turn on circuits to load the generator
	to approximately 25% rated load and run the unit
	for one hour.
5.	Run the unit for one hour at 50% rated load.
6.	Run the unit for one hour at 75% rated load.
7.	Run the unit for one hour at 100% rated load.

FUSE
5A	OFF MAN.
AUTO
FUSE
15A	SET
	EXERCISE
	TIME

L o c a t e y o u r n e a r e s t d e a le r a t :

POWER SYSTEMS, INC.

SYSTEM SET

LOW OIL

HIGH TEMP.

OVER SPEED

OVER CRANK

F L A S H IN G G R E E N L E D =

N O U T IL IT Y S E N S E 4 F L A S H IN G R E D L E D S =

E X E R C IS E R N O T S E T

8.	Turn ON the utility power supply to the transfer
	switch, which will allow the transfer switch to
	transfer back to utility power. The unit will con-
	tinue to run for one minute and then shut down.
9.	Allow the unit to cool.
10.	Set the generator's Auto/Off/Manual switch to
	OFF. Remove the 5A and 15A fuses from the gen-
	erator control panel. Disconnect the battery
	cables as outlined in “General Hazards” (page 2).
11.	Drain the oil and remove the oil filter. Replace the
	oil filter according to Section 4.4, “Changing the
	Oil Filter”. Replace the oil with synthetic oil as
	recommended in Section 4.3, “Changing the
	Engine Oil”.
12.	Reconnect the battery cables as outlined in
	“General Hazards” (page 2) and insert the 5A and
	15A fuses into the generator control panel. The
	generator is now ready for service.

3.2USING THE AUTO/OFF/MANUAL SWITCH (FIGURE 3.1)

‹3.2.1 “AUTO” POSITION

Selecting this switch position activates fully automat- ic system operation. It also allows personnel to start and exercise the engine every seven days with the set- ting of the exercise timer (see Section 3.6). This posi- tion also is used for remote starting, when it is set up.

‹3.2.2 “OFF” POSITION

This switch position shuts down the engine. This position also prevents automatic operation.

With the switch set to AUTO, the engine may

!crank and start at any time without warning. Such automatic starting normally occurs when utility power source voltage drops below a pre- set level or during the normal exercise cycle. To prevent possible injury that might be caused by such sudden starts, always set the switch to OFF and remove the fuses before working on or around the generator or transfer switch. Then, place a “DO NOT OPERATE” tag on the generator panel and on the transfer switch.

3.3AUTOMATIC TRANSFER

OPERATION

To select automatic operation, do the following:

1.Make sure the transfer switch main contacts are set to their “Utility” position, i.e., loads connected to the utility power source (Figure 3.2).

2.Be sure that normal utility power source voltage is available to transfer switch terminal lugs N1 and N2.

3.Set the generator’s Auto/Off/Manual switch to AUTO.

4.Set the generator’s main circuit breaker to its ON (or closed) position.

With the preceding steps complete, the generator will start automatically when utility source voltage drops below a preset level. After the unit starts, loads are transferred to the standby power source. Refer to Section 3.4, “Sequence of Automatic Operation.”

14 Generac® Power Systems, Inc.