Generac Power Systems 005240 - Manual (Page 20)

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3.4.2 TRANSFER BACK TO UTILITY POWER
SOURCE
When utility power has been restored, transfer back
to that source and shut down the generator. This can
be accomplished as follows:
1. Set the generator’s main circuit breaker to its
OFF (or OPEN) position.
2. Let the engine run for a minute or two at no-load
to stabilize the internal temperatures.
3. Set the generator’s AUTO/OFF/MANUAL switch to
its OFF (or OPEN) position. The engine should
shut down.
4. Check that utility power supply to the transfer
switch is turned OFF.
DANGER

Do not attempt to activate the transfer switch
manually until all power voltage supplies
to the switch have been positively turned off.
Failure to turn off all power voltage supplies
may result in extremely hazardous and possibly
fatal electrical shock.
5. Use the manual transfer handle inside the trans-
fer switch to move the main contacts back to their
UTILITY position, i.e., loads connected to the util-
ity power source (Figure 3.2).
6. Turn ON the utility power supply to the transfer
switch using the means provided.
7. Set the system to automatic operation as outlined
in Automatic Transfer Operation section.
3.5 SETTING THE EXERCISE TIMER
This generator is equipped with an exercise timer.
Once it is set, the generator will start and exercise
once every seven days, on the day of the week and at
the time of day the following sequence is completed.
During this exercise period, the unit runs for approx-
imately 12 minutes and then shuts down. Transfer of
loads to the generator output does not occur during
the exercise cycle unless utility power is lost.
A switch on the control panel (see Figure 3.1) per-
mits selection of the day and time for the system to
exercise. At the chosen time, perform the following
sequence to select the desired day and time of day
the system will exercise. Remember seasonal time
changes affect the exercise time settings.
1. Verify that the AUTO/OFF/MANUAL switch is set
to AUTO.
2. Press and hold the "Set Exercise Time" switch for
several seconds, then release. All the red LED's
will flash for approximately 10 seconds and then
stop.
‹ 3. Once the red LED's stop flashing, the generator
will start and run for approximately 12 minutes
and then shut down. The exerciser is now set to
run at this time of day each week.
Example: If the "Set Exercise Time" switch is
pressed on Saturday afternoon at 2:00 p.m., the
generator will start and exercise for approximate-
ly 12 minutes every Saturday at 2:00 p.m..
NOTE:
The exerciser will only work in the AUTO mode
and will not work unless this procedure is per-
formed. The exerciser will need to be reset every
time the 12-volt battery is disconnected and then
reconnected, and when the 15A fuse is removed.
The 16kW unit has a low speed exercise option. Dip
switch 1 on the control board is factory set to OFF.
This allows the engine to run at a slower speed dur-
ing weekly exercise periods for quieter operation. If
this Dip switch is set to ON, the generator will exer-
cise at it's normal speed.
This DIP switch position is only read at board power
up. If the DIP switch position is changed, power to
the board must be cycled for the micro controller to
recognize the new DIP switch position.
Low speed exercise will be handled as follows:
1. The standard start sequence will be initiated.
2. The unit will run at 2,400 RPM.
3. If utility is lost during exercise, the controller will
do the following:
• Wait 10 seconds for utility to return.
• If utility returns within 10 seconds, continue to
exercise at 2,400 RPM.
• If utility is still lost after 10 seconds, run the
engine up to 3600 RPM and transfer the load.
At this time the controller will exit the exercise
routine and assume full automatic operation.
3.6 PROTECTION SYSTEMS
3.6.1 LOW OIL PRESSURE SWITCH
This switch (Figure 3.3) has normally closed con-
tacts that are held open by engine oil pressure dur-
ing cranking and operating. Should oil pressure
drop below the 8 psi range, switch contacts close,
and the engine shuts down. The unit should not be
restarted until oil is added. The AUTO/OFF/MANUAL
switch must then be turned to OFF and then back to
AUTO.
‹
Section 3 — Operation
Air-cooled Generators