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Kohler 14RESA User Manual

Kohler 14RESA
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TP-6805 8/15 103Section 6 Component Testing and Adjustment
6.8 Governor System
The governor system consists of an electromechanical
stepper motor (actuator) and an engine speed
detection/feedback circuit. The RDC2 or DC2 controller
controls the governor system operation. See Section 8,
Wiring Diagrams, for the governor connections.
6.8.1 Operation
The frequency of the alternator output is determined by
the speed of the engine. A two-pole alternator is driven
at 3600 rpm to provide 60 Hertz. (A 50 Hz model is
driven at 3000 rpm.) The engine speed is maintained by
an electronic governor system that consists of an
embedded controller and electric actuator (stepper
motor).
The governor system is controlled by the generator set
controller. The controller provides regulated power to
the bidirectional stepper motor actuator, which is linked
to the carburetor throttle arm.
The engine runs at a reduced speed during the warmup
and cooldown idle period of the cycle exercise. During
this time, the rotor field is not energized and the
generator will not produce voltage. When not producing
voltage, the generator will not be subject to large
changes in engine loading, so the governor response is
dramatically slowed to decrease throttle linkage wear
and fuel consumption. The response is also slowed
during cooldown and fault cooldown for the same
reason.
The engine speed adjustment setting in SiteTech allows
adjustment of the engine speed for testing purposes.
See Section 6.9.2. If the engine is hunting or surging, do
not adjust the engine speed. Test the governor
operation as described in Sections 6.8.3 and 6.8.4.
Then adjust the governor gain to stabilize the engine
operation if necessary before adjusting the speed. See
Section 6.9.1.
6.8.2 Initial Checks
The factory sets the electronic governor. Under normal
circumstances the electronic governor requires no
further adjustment. Verify that the governor stepper
motor moves smoothly and steadily during operation. If
the engine operates erratically, check the following
connections and conditions before adjusting the
governor.
Accidental starting.
Can cause severe injury or death.
Disconnect the battery cables before
working on the generator set.
Remove the negative (--) lead first
when disconnecting the battery.
Reconnect the negative (--) lead last
when reconnecting the battery.
WARNING
Disabling the generator set. Accidental starting can
cause severe injury or death. Before working on the
generator set or equipment connected to the set, disable the
generator set as follows: (1) Press the generator set off/reset
button to shut down the generator set. (2) Disconnect the
power to the battery charger, if equipped. (3) Remove the
battery cables, negative (--) lead first. Reconnect the negative
(--) lead last when reconnecting the battery. Follow these
precautions to prevent the starting of the generator set by the
remote start/stop switch.
D
Verify that the electrical connections are clean and
tight.
D Verify that the battery connections are clean and tight.
D Check for a loose or worn stepper motor/throttle shaft
coupling. Replace the shaft and bushing every 500
hours of engine operation.
D Check the carburetor for dirt, grime, or
misadjustment. Check for a loose mixer assembly.

Table of Contents

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Questions and Answers:

Kohler 14RESA Specifications

General IconGeneral
Voltage120/240V
Frequency60 Hz
Fuel TypeGasoline
EngineKohler
PhaseSingle Phase
Starting SystemElectric
Warranty3 years limited

Summary

Service

Safety Precautions and Instructions

Accidental Starting

Details hazards and procedures to prevent accidental generator starting.

Battery Safety

Covers safety precautions for handling batteries, acid, and gases.

Engine Backfire and Fuel System Safety

Warns about fire hazards from engine backfire and fuel leaks.

Exhaust System and Carbon Monoxide Safety

Addresses carbon monoxide hazards and exhaust system integrity.

Hazardous Voltage, Moving Parts, and Fuel System Safety

Highlights dangers of hazardous voltage, moving parts, and fuel system safety.

Heavy Equipment and Hot Parts Safety

Covers safety for lifting equipment and hot engine/exhaust components.

Service Assistance

Section 1 Specifications

Section 2 Scheduled Maintenance

Accidental Starting and Hazardous Voltage Precautions

Details safety procedures for accidental starting and hazardous voltage.

Service Schedule and Routine Maintenance

Outlines maintenance tasks, frequency, and routine service based on operating conditions.

Service Schedule Table

A table detailing maintenance tasks, frequency, and corresponding sections.

Battery Maintenance and Cleaning

Provides general information, maintenance, and cleaning instructions for the battery.

Section 3 Generator Reconnection

Voltage Reconnection Procedures

Explains procedures for reconnecting generator set stator leads for different voltages.

Section 4 Controller

SiteTech Software for Controller Management

Explains the use of SiteTech software for controller configuration and firmware updates.

Controller Parameters Overview

Introduces adjustable parameters and notes on selected settings like temperature and engine speed.

Controller Replacement Procedure

Provides instructions for replacing the RDC2 or DC2 controller, including important notes.

Controller Setup Procedure

Details the procedure for setting controller parameters after installation.

Voltage Calibration Procedures

Explains how to check and adjust voltage calibration using keypad or SiteTech.

Section 5 Troubleshooting

Fuel System Troubleshooting Guide

Guides on troubleshooting common fuel system problems related to pressure and regulator function.

Troubleshooting Engine Hunting in 20 kW Models

Provides a sequence to diagnose and resolve engine hunting issues.

Fault Messages and Overload Shutdowns

Lists fault messages, their descriptions, and recommended checks, including overload conditions.

Fault Messages: Battery, Timing, and Speed Issues

Lists fault messages related to battery, timing, speed, and thermostat issues.

Troubleshooting Paralleling Faults and Events

Lists warning messages and events related to paralleling systems.

Troubleshooting Chart

A reference table for troubleshooting individual problems, causes, tests, and corrective actions.

Controller Troubleshooting Guide

Provides a table for troubleshooting controller issues like display problems and communication loss.

Load Management Troubleshooting

Guides on troubleshooting issues with load management devices and controller recognition.

Section 6 Component Testing and Adjustment

Alternator Excitation Theory and Procedures

Covers alternator excitation, including no/low voltage, erratic regulation, and separate excitation.

Voltage Adjustments and Regulator Settings

Explains how to adjust voltage and configure voltage regulator settings.

Fault Shutdown Tests

Verifies the operation of overspeed, overcrank, and low oil pressure shutdowns.

Section 7 Disassembly/Reassembly

Safety Precautions for Disassembly

Highlights critical safety warnings for disassembly procedures.

Section 7 Reassembly

Section 8 Wiring Diagrams

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