TP-6810 11/1318 Section2 GeneratorSetOperation
DATS connection. The controller verifies that the
Model RXT ATSinterface board is connected.
DBattery voltage. Battery voltage is checked before
exercise to verify engine starting capability. Battery
voltageprovides a measurement of battery health. If
thecontroller detects low battery voltage, low battery
orlow charging battery is displayed and the exercise
does not start.
DCoolant level check. Thecoolant level is checked.
DCommunication integrity tests. J1939, RBUS,
Ethernet, and USB are monitored for messages
indicating that the controller and wiring are reliable.
DEngine speed. Engine speed is measured at low
speed and full speed. An overspeed or underspeed
conditionwill result in a fault condition and shutdown.
DGenerator output frequency and voltage.
Operating the generator at full speed allows the
RDC2controller to check the output power for correct
voltage,frequency, and stability. Whenthe engine is
running at full speed, the controller verifies that the
voltageand frequency are within acceptable limits. A
faultmessage is displayed if the voltage or frequency
is out of range.
DOil pressure. Oil pressure is verified to ensure
proper lubrication of critical engine components.
Pressureis monitored at both low and full speeds. If
the oil pressure is low, low oil pressure is displayed
and the generator set shuts down.
2.5.2 Unloaded Full-Speed Exercise
Theunloaded full speed exercise runs the generator set
atfull speed for 20 minutes without transferring the load.
To set an unloaded full speed exercise, follow the
procedure in Figure 2-3 and select Exercise Mode:
Unloaded Full.
2.5.3 Loaded Full-Speed Exercise (withRXT only)
Aloaded exercise starts the generator set, ramps up to
fullspeed, and then transfers the electrical load from the
utility source to the generator set. The load is
transferred back to the utility source before the
generator set shuts down.
Note: With a loaded exercise, power to the building is
lost for up to 10 seconds during load transfer.
Fora loaded exercise controlled by the RDC2 controller,
a Model RXT transfer switch must be connected to the
generator set. To set a loaded exercise, follow the
procedure in Section 2.5.8 and select Exercise Type:
Loaded.
Fora loaded exercise with a transfer switch other than a
KohlerrModel RXT, program the exercise at the
transfer switch controller. Refer to the transfer switch
operation manual for instructions.
2.5.4 Shutdown During Exercise
Thefollowing advanced diagnostic operation applies to
RDC2 controllers with firmware versions 5.04 and
higher.
If the generator set shuts down on a fault during an
exercise,the controller will try to restart the engine. If the
enginestarts, the generator set will run at full speed for
twominutes and then stop. The event history will show
AdvancedDiagnostic Active. The exercise schedule is
maintained.
Ifthe engine does not start, the shutdown message will
be displayed. Correct the fault condition and reset the
fault as described in Section 2.6.
2.5.5 Power Failure During Exercise
If the utility power is lost during an unloaded exercise,
theATStransfers to the emergency source, the exercise
is ended and the control remains in the AUTOmode.
If the utility power is lost during a loaded exercise, the
exerciseis ended. The ATS remains in the emergency
position and the control goes into the AUTOmode.
Thegenerator set continues to run and supply power to
the load for the duration of the utility power outage.
WhenUtility power is restored, the ATSwill re-transfer to
the utility source through normal timing sequences.
2.5.6 Exerciser Reset
Toreset the exerciser to run at a different day and/or
time or to change the exercise mode, follow the
procedure in Section 2.5.7 to change the exerciser
settings.
2.5.7 Setting the Exerciser at Power-up
When power is connected to the controller,you will be
prompted to set the date, time,and exercise schedule.
1. At power--up, the date is displayed with the year
flashing. Use the up or down arrow key to step to
the current year.