Unloaded Cycle Exercise With Complete System Diagnostics - Kohler 14RCA Instructions Manual

2.4.2

Unloaded Cycle Exercise with Complete System Diagnostics

An unloaded exercise runs the generator set without signaling the transfer switch to transfer the electrical load from the ut ility
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 23 and described below.
•
Runs at reduced speed for 10 minutes to warm up and exercise the engine.
•
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.
•
Ramps down and runs at reduced speed for 5 minutes to cool down the engine before shutting down automatically.
Figure 23 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.
•
ATS connection. The controller verifies that the Model RXT ATS interface board is connected.
•
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.
•
Communication integrity tests. J1939, RBUS, Ethernet, and USB are monitored for messages indicating that the
controller and wiring are reliable.
•
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.
•
Generator output frequency and voltage. Operating the generator at full speed allows the RDC2 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.
•
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.
32
3 min.
1 min.
10 min.
Engine Full-Speed
Exercise Diagnostics
1 min.
5 min.
Cooldown
TP-7092 11/22