ARMY TM 9-6115-671-14 AIR FORCE TO 35C2-3-446-32 MARINE CORPS TM 09249A/09246A-14    2-11 TABLE 2-4.  DIAGNOSTIC CONTROLS AND INDICATORS KEY CONTROL OR INDICATOR FUNCTION DCS LOAD SHARING SYNCHRONIZER 1 L1 indicator (green LED) This indicator is lit when the load sharing control is making transition from zero power output up to a power output in a load sharing (paralleling) condition.  Normally, this LED is lit only during the load sharing (paralleling) period. 2 L2 indicator (green LED) This indicator is lit only when zero power from the generator set is reached before the breaker is opened.  It indicates when the I/O interface module is calling for the generator to go to zero power output before the generator breaker is opened automatically by the I/O interface module. 3 REVERSE POWER (red LED) This indicator is lit when a reverse power situation exists.  The I/O interface module has been notified to remove the generator set from service (open the breaker). 4 GEN indicator (green LED) This indicator is normally lit when the generator set is operating (engine is running).  When lit, the LED indicates the module is receiving AC power from the generator. 5 BUS indicator (green LED) This indicator is normally lit only when the generator set is running and the main breaker is closed.  It is also lit when another generator set is connected to the main breaker and its breaker is closed.  When lit, the LED indicates AC power is being received from the bus (the output of the generator set main breaker) into the module.  The indicator is not lit if the bus has failed, and when this module is not being used. 6 SYNCH ENABLED indicator (green LED) This indicator is lit only when the I/O interface module requests synchronizing the output power of the generator set with a second generator set and the paralleling cable has been connected between the two sets.  In addition, the AC CIRCUIT INTERRUPT switch on the primary set has been previously moved to the CLOSED position.  This indicator is lit only during the synchronizing period. 7 PARALLEL ENABLE indicator (green LED) This indicator will be lit when the I/O interface module has closed the main breaker.  That is, the I/O interface module has commanded the DCS load sharing synchronizer to close the connection with the paralleling cable and begin parallel operation of the two generator sets. 8 SYNCHRONIZED indicator (green LED) This indicator will be lit when the generator is in synch with the bus.  When this LED is lit, the DCS load sharing synchronizer has signaled the I/O interface module that paralleling may occur. 9 DC POWER indicator (green LED) This indicator is normally lit only when the generator set is operating (engine is running).  It is off at all other times.  When lit, the LED indicates the internal DC supply of the module is operating (i.e., the module is receiving DC power from the generator set, and the module is properly converting the power into its own operating voltage(s).