Generac Power Systems 04389-3 - Manual (Page 16)

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Section 3 — Operation
Air-cooled 7 kW, 12 kW and 15 kW Generators
7. Restart the unit.
8. Slowly turn the idle adjust screw to adjust the
no-load idle frequency to 63-63.5 Hz (with door
open).
9. The governor is now set.
2.7.3 ADDITIONAL CORROSION
PROTECTION
Periodically spray all engine linkage parts and brack-
ets with corrosion inhibiting spray such as WD-40 or
a comparable product.
2.8 VOLTAGE REGULATOR
ADJUSTMENT
With the frequency between 62-63 Hertz, slowly turn
the slotted potentiometer (Figure 2.6) until line volt-
age reads 247-252 volts.
Figure 2.6 – Voltage Adjustment Potentiometer
NOTE:
The access panel on top of the control panel must
be removed to adjust the voltage regulator.
NOTE:
The voltage regulator is housed above the gen-
erator's control panel. The regulator maintains a
voltage in direct proportion to frequency at a 2-to-
1 ratio. For example, at 62 Hertz, line-to-neutral
voltage will be 124 volts.
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3.1 BREAK-IN PROCEDURE
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.
2. Turn OFF the utility power supply to the transfer
switch using the means provided (such as a utility
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.
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 main circuit breaker to its
OFF (or OPEN) position.
11. Set the generator's AUTO/OFF/MANUAL switch
to OFF. Remove the 7.5A and 15A fuses from the
generator control panel. Disconnect the battery
cables as outlined in “General Hazards”.
12. 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”.
13. Reconnect the battery cables as outlined in
“General Hazards” (page 2) and insert the 7.5A
and 15A fuses into the generator control panel.
The generator is now ready for service.
3.2 USING THE AUTO/OFF/MANUAL
SWITCH (FIGURE 3.1)
3.2.1 “AUTO” POSITION
Selecting this switch position activates fully auto-
matic system operation. It also allows personnel to
start and exercise the engine every seven days with
the setting of the exercise timer (see Section 3.6).
This position also is used for remote starting, when
it is set up.
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