Kohler Power Systems 14/20RESA User Manual download pdf (Page 24)

TP-6804 12/1124 Section 2 Generator Set Operation

RDC2/DC2 controller to check the output power for

correct voltage, frequency, and stability. When the

engine is running at full speed, the controller verifies

that the voltage and frequency are within acceptable

limits. A fault message is displayed if the voltage or

frequency is out of range.

D Oil pressure. Oil pressure is verified to ensure

proper lubrication of critical engine components.

Pressure is monitored at both reduced and full

speeds. If the oil pressure is low, the Low Oil Pressure

message is displayed and the generator set shuts

down.

2.4.3 Unloaded Full-Speed Exercise

The unloaded full-speed exercise runs the generator set

at full speed for 20 minutes without transferring the load.

To set an unloaded full-speed exercise, follow the

procedure in Figure 3-8 and select Exercise Mode:

Unloaded Full.

2.4.4 Loaded Full-Speed Exercise (with

RXT only)

A loaded exercise starts the generator set, ramps up to

full speed, and then transfers the electrical load from the

utility source to the generator set. After 20 minutes, the

load is transferred back to the utility source. The engine

runs without load for 5 minutes or until cool, and then

shuts down automatically.

Note: With a loaded exercise, power to the building is

lost for up to 10 seconds during load transfer.

For a loaded exercise controlled by the RDC2 or DC2

controller, a Model RXT transfer switch must be

connected to the generator set. To set a loaded

exercise, follow the procedure in Figure 3-8 and select

Exercise Type: Loaded.

For a loaded exercise with a transfer switch other than a

Kohlerr Model RXT, program the exercise at the

transfer switch controller. Refer to the transfer switch

operation manual for instructions.

2.4.5 Power Failure During Exercise

Cycle

If the utility power is lost during an unloaded exercise,

the ATS transfers to the emergency source, the exercise

is ended and the control remains in the AUTO mode.

If the utility power is lost during a loaded exercise, the

exercise is ended. The ATS remains in the emergency

position and the control goes into the AUTO mode.

The generator set continues to run and supply power to

the load for the duration of the utility power outage.

When Utility power is restored, the ATS will re-transfer to

the utility source through normal timing sequences.

2.5 Faults

The RDC2/DC2 controller displays fault messages for

generator set warnings and shutdowns. Selected fault

messages are shown in Figure 2-3.

2.5.1 Warnings

The controller displays a fault message but the

generator set does not shut down on a warning. The

controller resets automatically after a warning condition

is corrected.

2.5.2 Shutdowns

Under a fault shutdown condition, the generator set

shuts down automatically and the controller displays a

fault message. The OFF LED flashes. In some cases,

the engine cooldown cycle runs before the engine shuts

down. See Figure 2-3.

Shutdown switches (such as the low oil pressure switch

or high engine temperature switch) on the generator set

will automatically reset when the problem is corrected.

However, the fault condition at the controller does not

clear until the controller is reset.

The generator set cannot be restarted until the fault

condition is corrected and the controller is reset. See

Section 2.5.4 for instructions to reset the controller after

a fault shutdown.

2.5.3 ATS Communication Errors

When a Model RXT transfer switch is used, an ATS fault

indicates that the connection to the interface board on

the transfer switch has been lost. Check the connection

to the ATS interface board.

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Kohler Power Systems 14/20RESA User Manual Page 24

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