Generac Power Systems 5255 User Manual
17
Section 3 — Operation
Air-cooled Generators
4. Use the manual transfer handle inside the trans-
fer switch to move the main contacts to their
STANDBY position, i.e., loads connected to the
standby power source (Figure 3.2).
STANDBY position, i.e., loads connected to the
standby power source (Figure 3.2).
5. To crank and start the engine, set the AUTO/OFF/
MANUAL switch to MANUAL.
6. Let the engine stabilize and warm up for a few
minutes.
7. Set the generator’s main circuit breaker to its ON
(or CLOSED) position. The standby power source
now powers the loads.
now powers the loads.
Figure 3.2 – Manual Transfer Switch Operation
3.4.2
TRANSFER BACK TO UTILITY POWER
SOURCE
SOURCE
When utility power has been restored, transfer back
to that source and shut down the generator. This can
be accomplished as follows:
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.
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.
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).
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.
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.
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.
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.
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..
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.
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.
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.
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.