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Operation
Owner’s Manual for Stationary Emergency Generators 25
4.9.1— Automatic Sequence of Operation
4.9.1.1—Utility Failure
If the control panel is set to AUTO when the utility power fails, a ten second Start-Up Delay timer is started (user pro-
grammable). If utility power is still absent when the time expires, the engine cranks and starts.
Once started, a five second engine Warm-Up Delay timer starts (user programmable). When the time has elapsed, the
load is transferred to the generator. If utility power is restored (above 90% of nominal, dealer programmable) between
the time the engine is first started and expiration of the warm-up time, the controller completes the start cycle and then
runs through its normal cool-down cycle (while the load remains on the utility source throughout the episode).
4.9.1.2—Cranking
The cyclic cranking is controlled as follows:
Fifteen (15) seconds crank, seven (7) seconds rest, seven (7) seconds crank, seven (7) seconds rest; this sequence is
repeated for a total of six (6) crank cycles.
4.9.1.3—Load Transfer
With the generator running, the transfer of load is dependent upon the operating mode as follows:
4.10 — Transfer Switch Manual Operation
DO NOT attempt to activate the transfer switch manually until all power voltage supplies to the switch
have been completely turned off. Failure to turn off all power voltage supplies may result in extremely
hazardous and possibly fatal electrical shock.
Prior to automatic operation, manually exercise the transfer switch to verify that there is no binding or interference with
proper operation of the mechanism. Manual operation of the transfer switch is required if automatic operation fails.
AUTO
• Starts and runs if utility power fails (falls below 60% of nominal) for five consecutive sec-
onds (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 the warm-up and cool-down cycles).
• Transfers back to utility once utility power returns (above 80% of nominal) for fifteen
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.
NOTE: Cool-down cycle is five minutes if turbocharger equipped, one minute if naturally
aspirated.
EXERCISE
• Only works in AUTO mode.
• Does not exercise if generator is already running in AUTO.
• During exercise cycle, transfers only if utility power fails for ten consecutive seconds.
MANUAL
• 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 ten consecutive sec-
onds.
• Transfers back to utility when utility returns for fifteen consecutive seconds. The engine
continues to run until the AUTO or OFF key is pressed.