Load Transfer; Manual Transfer Operation; Transfer To Generator Power Source - Generac GH-410 Manual Del Propietário

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.
3.3.3

LOAD TRANSFER

The transfer of load when the generator is running is dependent
upon the operating mode as follows:
1. Manual
• Will not transfer to generator if utility is present.
• Will transfer to generator if utility fails (below 70% of nominal
for 20 or 50 consecutive seconds.
• Will transfer back when utility returns for 10 consecutive
seconds. The engine will continue to run until removed from
the Manual mode.
Section 3 — Operation
Air-cooled Generators
2. Auto
• Will start and run if Utility fails for 10 consecutive seconds.
• Will start a 20 to 50 second selectable engine warm-up
timer.
• Will not transfer if utility subsequently returns.
• Will transfer to generator if utility is still not present.
• Will transfer back to utility once utility returns (above 80% of
nominal) for 10 seconds.
• Will transfer back to utility (IF available) if the generator is shut
down for any reason (such as the switch is in the OFF posi-
tion) or a shutdown alarm and the utility source is available.
• After transfer, will shut down engine after one (1) minute
cool-down time.
3. Exercise
• Will not exercise if generator is already running in either Auto
or Manual mode.
• During exercise, the controller will only transfer if utility fails
during exercise for 10 seconds, and will switch to Auto
mode.
3.3.4 UTILITY RESTORED
Initial Condition: Generator supplying power to customer load.
When the utility returns (above 80% of nominal), a 10 second
return to utility timer will start. At the completion of this timer, if
the utility supply is still present and acceptable, the control will
transfer the load back to the utility and run the engine through a
one (1) minute cool down period and then shut down. If utility fails
during this cool down period, the control will transfer load back
to the generator and continue to run while monitoring for utility to
return.
3.4

MANUAL TRANSFER OPERATION

3.4.1

TRANSFER TO GENERATOR POWER SOURCE

To start the generator and activate the transfer switch manually,
proceed as follows:
1. Set the generator's AUTO/OFF/MANUAL switch to OFF.
2. Set the generator's main circuit breaker to its OFF (or OPEN)
position.
3. Turn OFF the utility power supply to the transfer switch
using the means provided (such as a utility main line circuit
breaker).
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 electri-
cal shock.
4. Use the manual transfer handle inside the transfer switch to
move the main contacts to their STANDBY position, i.e., loads
connected to the standby power source (Figure 3.3).
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