TEKSAN DIESEL GENERATOR SETS Operation And Maintenance Manual page 35

EVERLASTING COMPANY
AUTO: This mode is used for running the generator automatically and transferring the load between mains &
generator set automatically.
Once this mode is selected on controller; if at least one of the phase voltages at the mains side gets out of
configured limits, then the mains contactor gets opened and the engine starts cranking for pre-configured times
and with pre-configured intervals. The controller stops cranking right after the diesel engine gets running. Then
when all the generator phase voltages rise and get up to a pre-configured level, the generator set contactor gets
closed after "engine heat up" and "contactor" timers and finally the load gets transferred to generator set from
mains and it begins to be supplied from generator set.
After all phase voltages on the mains side, get back into pre-configured tolerance limits again, the controller begins
to count down a "mains waiting timer" just to be sure that the mains voltages are back and proper again. Then
the generator set contactor gets opened, mains contactor gets closed and the load begins to be supplied back
from mains again. After the load is transferred back to mains successfully, the controller stops the engine after a
"cooldown timer". Once the engine is stopped finally, the generator set gets back to its "standby" rest position for
waiting next mains failure.
If the operation of the generator set is being blocked by a weekly schedule, then the AUTO led will flash, and the
operation of the generator set will be as in the STOP mode.
TEST: This mode is used for testing the generator with or without load while the mains is still available. Once this
mode is selected on controller; the operation of the generator is similar to the AUTO mode, but the mains contactor
will not get opened if the mains is available. And if the mains is not available, the mains contactor gets opened and
the generator set contactor gets closed.
When the mains is back on again, the load gets transferred back to mains again, but the engine keeps running
unless another mode is selected. For stopping the engine in such a case, another mode of operation (AUTO or
STOP) should be selected on controller.
RUN: This mode is used for running the generator with or without load while the mains is still available or if there
is no mains at all. Once this mode is selected on controller; the engine will get running. For transferring the load
between mains and generator set in this mode, the contactor buttons on front panel should be used for manual
operation.
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