Kohler Power Systems 14/20RESA User Manual download pdf (Page 23)

TP-6804 12/11 23Section 2 Generator Set Operation

2.4 Exercise

The RDC2 and DC2 controllers can be set to

automatically run the generator set at the same time and

day each week. Exercising the generator set weekly or

every two weeks is required to keep the engine and

alternator in good operating condition.

Three exercise modes are available: unloaded cycle,

unloaded full speed, and loaded full speed. See

Sections 2.4.2 through 2.4.4 for information about the

exercise modes. A loaded exercise can be set at the

RDC2 controller only if a Model RXT transfer switch is

connected.

Note: With the RDT and RSB transfer switches, it is

possible to have two exercise settings (one

unloaded exercise set at the generator set

controller, and another exercise set at the ATS

controller). If the exercise times overlap, the ATS

exercise setting takes priority.

If a Model RDT or RSB transfer switch is used, refer to

the instructions provided with the transfer switch to set a

loaded exercise at the ATS, if desired.

2.4.1 Set ting the Exerciser

When power is applied to the RDC2 controller (that is,

when the battery is connected), you will be prompted to

set the date and time, and then to set the exerciser.

The first setting will flash. Press the Up and Down arrow

buttons to change the setting. Press Select to save the

setting and move on to the next. See Section 3.5 for

more detailed instructions to change settings on the

RDC2. See Section 3.6 for more detailed instructions to

set the exerciser or change the exercise settings.

The DC2 controller does not prompt you to set the

exerciser. See Section 4.5 for instructions to set the

exerciser on the DC2.

2.4.2 Unloaded Cycle Exercise wit h

Complete System Diagnostics

An unloaded exercise runs the generator set without

signalling the transfer switch to transfer the electrical

load from the utility source to the generator set. The

Unloaded Cycle exercise with diagnostics is the

recommended exercise mode and is the default

exercise setting.

The Unloaded Cycle exercise runs the engine for 20

minutes in the cycle shown in Figure 2-1 and described

below.

D Runs at reduced speed for 10 minutes to warm up

and exercise the engine.

D Ramps up and runs at full speed for 3 minutes.

Engine diagnostics are performed during this

full-speed portion of the cycle, which provides the

best test of engine and alternator power backup

capability. Diagnostic tests at full speed can identify

potential problems with the power output and alert the

operator before an emergency event.

D Ramps down and runs at reduced speed for 5

minutes to cool down the engine before shutting down

automatically.

Engine Speed, RPM

Engine

Exercise

Full-Speed

Diagnostics

Cooldown

3min.

1min.

10 min. 5 min.

Figure 2-1 Unloaded Exercise Cycle

System Diagnostics

During the unloaded exercise, the controller monitors

the following data. The controller display indicates that

the generator set is running, unless a fault is detected as

described below.

D ATS connection. The controller verifies that the

Model RXT ATS interface board is connected.

D Battery voltage. Battery voltage is checked before

exercise to verify engine starting capability. Battery

voltage provides a measurement of battery health. If

the controller detects low battery voltage, the

condition is indicated on the display.

D Communication integrity tests. J1939, RBUS,

Ethernet, and USB are monitored for messages

indicating that the controller and wiring are reliable.

D Engine speed. Engine speed is measured at

reduced speed and full speed. An overspeed or

underspeed condition will result in a fault condition

and shutdown.

D Generator output frequency and voltage.

Operating the generator at full speed allows the

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Kohler Power Systems 14/20RESA User Manual Page 23

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