Generac Power Systems RG10090 Owner's Manual page 25

Transfer Switch Automatic Operation
In AUTO, generator starts automatically when utility
source voltage drops below preset level. Loads are trans-
ferred to standby power source once unit starts.
Proceed as follows to select automatic operation:
1. Verify transfer switch main contacts are set to UTIL-
ITY (loads connected to utility power source).
2. Verify normal utility power source voltage is avail-
able to transfer switch terminal lugs N1, N2, and N3
(if three-phase).
3. Set generator MLCB (generator disconnect) to ON
(CLOSED).
4. Press AUTO on control panel. A green LED illumi-
nates to verify system is in AUTO.
Automatic Sequence of Operation
Utility Failure
If control panel is set to AUTO when utility power fails, a
10 second startup delay timer is started (user
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AUTO
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NOTE: Cool-down cycle is five minutes if turbocharger equipped, one minute if naturally aspirated.
EXERCISE
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MANUAL
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Spark-Ignited Stationary Generators Owner's Manual
Starts and runs if utility power fails (falls below 60% of nominal) for five consecutive seconds
(adjustable).
Starts a five second (adjustable) engine warm-up timer.
Does not execute transfer if utility power returns before expiration of warm-up timer (but finishes
warm-up and cool-down cycles).
Transfers back to utility once utility power returns (above 80% of nominal) for 15 consecutive
seconds.
Only shuts down if OFF is pressed or an alarm shutdown occurs.
Once utility power returns, starts a cool-down cycle before it shuts down.
Only works in AUTO.
Does not exercise if generator is already running in AUTO.
During exercise cycle, transfers only if utility power fails for 10 consecutive seconds.
Engine cranks and runs even if utility power is present, but does not transfer to generator.
Transfers to generator if utility fails (falls below 60% of nominal) for 10 consecutive seconds.
Transfers back to utility when utility returns for 15 consecutive seconds. Engine continues to run until
AUTO or OFF is pressed.
programmable). If utility power is still absent when time
expires, engine cranks and starts.
Once started, a five second engine warm-up delay timer
starts (user programmable). When time has elapsed, load
is transferred to generator. If utility power is restored
(above 90% of nominal, dealer programmable) between
the time engine is first started and expiration of warm-up
time, controller completes the start cycle and then runs
through its normal cool-down cycle (while load remains
on utility source throughout the episode).
Cranking
The cyclic cranking is controlled as follows:
15 seconds crank, seven seconds rest, seven seconds
crank, seven seconds rest; this sequence is repeated for
a total of six crank cycles.
Load Transfer
With generator running, transfer of load is dependent
upon the operating mode as follows:
Operation
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