Automatic Transfer Operation; Sequence Of Automatic Operation - Generac 8kW Manual Del Usario

Operation
Display Interface Menus
The LCD display is organized as detailed below:
• The "Home" page, this page is the default page which will be
displayed if no keys are pressed for 30 seconds. This page
normally shows the current Status message and the current
date and time. The highest priority active Alarm and/or Warning
will be automatically posted on this page as well as flashing
the backlight when such an event is detected. In the case of
multiple Alarms or Warnings, only the first message will be
displayed. To clear an Alarm or Warning, see the Protection
Systems section - Clear Alarm.
• The display backlight is normally off. If the user presses any
key, the backlight will come on automatically and remain on for
30 seconds after the last key was pressed.
• The "Main Menu" page will allow the user to navigate to all other
pages or sub-menus by using the Left/Right and Enter keys.
This page can be accessed at any time with several presses of
the dedicated Escape key. Each press of the Escape key takes
you back to the previous menu until the main menu is reached.
This page displays the following options: HISTORY; STATUS;
EDIT; AND DEBUG. (See the Appendix - "Menu System".)
3.2 AUTOMATIC 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 3.1).
2. Be sure that normal UTILITY power source voltage is avail-
able to transfer switch terminal lugs N1 and N2 (Refer to the
Electrical Data section).
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 auto-
matically when utility source voltage drops below a preset level.
After the unit starts, loads are transferred to the standby power
source. Refer to the Sequence of Automatic Operation section.
3.3 SEQUENCE OF AUTOMATIC
OPERATION
3.3.1 UTILITY FAILURE
Initial Conditions: Generator in Auto, ready to run, load being sup-
plied by utility source. When utility fails (below 60% of nominal),
a 10 second (optionally programmable) line interrupt delay time is
started. If the utility is still gone when the timer expires, the engine
will crank and start. Once started, a five (5) second engine warm-
up timer will be initiated. When the warm-up timer expires, the
control will transfer the load to the generator. If the utility power is
restored (above 80% of nominal) at any time from the initiation of
the engine start until the generator is ready to accept load (5 sec-
ond warm-up time has not elapsed), the controller will complete
the start cycle and run the generator through its normal cool down
cycle; however, the load will remain on the utility source.
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3.3.2 CRANKING
The system will control the cyclic cranking as follows: 16 second
crank, seven (7) second rest, 16 second crank, seven (7) second
rest followed by three (3) additional cycles of seven (7) second
cranks followed by seven (7) second rests.
Choke Operation
1. The 990/999cc engines have an electric choke in the air
box that is automatically controlled by the electronic control
board.
2. The 530cc engines have an electric choke on the divider panel
air inlet hose that is automatically controlled by the electronic
control board.
3. The 410cc engines have a choke behind the air box that is
automatically controlled by the electronic control board.
Failure to Start
This is defined as any of the following occurrences during crank-
ing:
1. Not reaching starter dropout within the specified crank cycle.
Starter dropout is defined as four (4) cycles at 1,000 RPM.
2. Reaching starter dropout, but then not reaching 2200 RPM
within 15 seconds. In this case the control board will go into
a rest cycle for seven (7) seconds, then continue the rest of
the crank cycle.
During a rest cycle the start and fuel outputs are de-energized and
the magneto output is shorted to ground.
Cranking Conditions
The following notes apply during cranking cycle.
1. Starter motor will not engage within five (5) seconds of the
engine shutting down.
2. The fuel output will not be energized with the starter.
3. The starter and magneto outputs will be energized together.
4. Once the starter is energized the control board will begin look-
ing for engine rotation. If it does not see an RPM signal within
three (3) seconds it will shut down and latch out on RPM
sensor loss.
5. Once the control board sees an RPM signal it will energize the
fuel solenoid, drive the throttle open and continue the crank
sequence.
6. Starter motor will disengage when speed reaches starter
dropout.
7. If the generator does not reach 2200 RPM within 15 seconds,
re-crank cycle will occur.
8. If engine stops turning between starter dropout and 2200
RPM, the board will go into a rest cycle for seven (7) seconds
then re-crank (if additional crank cycles exist).
9. Once started, the generator will wait for a hold-off period
before starting to monitor oil pressure and oil temperature
(refer to the Alarm Messages section for hold-off times).
10. During Manual start cranking, if the Mode switch is moved
from the Manual position, the cranking stops immediately.
11. During Auto mode cranking, if the Utility returns, the cranking
cycle does NOT abort but continues until complete. Once the
engine starts, it will run for one (1) minute, then shut down.