Kohler M340 Automatic Transfer Switches Service Manual (tp5604)

On a Kohler M340 transfer switch, the whole job is automatically moving a facility from utility power to generator power and back, usually in commercial buildings, data rooms, or critical services. This service manual is what I’d keep on the bench when I’m tracing control issues, checking timing logic, or tearing into the mechanism so I don’t guess. For example, if the switch hesitates going back to utility after the mains return, this book walks you through the checks to verify whether it’s a sensing problem, a control board issue, or a mechanical hang-up before you replace anything.

Applications & Use Cases

• Trace power and control circuits to isolate whether a no-transfer condition is electrical, control, or mechanical.
• Follow step-by-step disassembly/assembly of the switching mechanism so parts go back aligned and torqued correctly.
• Verify and adjust time delays and settings so transfer and retransfer happen in the right sequence.
• Confirm suspected component failures (relays, coils, sensors) with guided tests before ordering replacements.
• Inspect and route wiring correctly after repairs to avoid nuisance trips and intermittent faults.

FAQ

Q: Can I keep this manual on a tablet at the jobsite?

A: Yes, it’s practical to use on a tablet so you can zoom diagrams and search terms while working in the switchgear room.

Q: Is it worth printing sections of this manual?

A: Many techs print the key procedures and schematics they use often, then keep the full manual digital for quick searching.

Safety Note

Always de-energize and lock out all power sources before opening or servicing the transfer switch.

Kohler M340 Automatic Transfer Switches Index:

Safety Precautions and Instructions
Introduction
List of Related Manuals
Service Assistance

Section Specifications
Purpose of Switch
Components of Switch
Ratings
Interpreting a Transfer Switch Part Number
Specifications
Standard Features
Shunt-Jumper-Controlled Accessories
Optional Features

Section Operation
LED Indicators
Control Switches and Indicators
Sequence of Operation
Normal Source Failure
Normal Source Restoration
To Disconnect the P1 Plug
Electrical Operation Test

Section Troubleshooting Guide

Section Controller Troubleshooting
Power to the System
Keypad and Status Panel
Incorrect Normal Source Voltage and Frequency
Incorrect Emergency Source Voltage and Frequency
System Status Not-In-Automatic Error
System Status System-Alert
Contactor Position Fault Error Messages
Transfer Hang Error Message
Power-Down Error Message
RAM or Memory Error Message
Manual Transfer Message
Manual-to-Off Transfer Message
Fault Number One or Fault Number Two Message
Programming Mode Not-In-Off
Engine Operates When It Should Not
Engine Will Not Start
Area Protection
Shunt Jumper Controlled Options
Inphase Monitor
Source Monitors
Plant Exerciser
Time Delays
Manual Override

Section Accessory Troubleshooting
Optional Accessories
Emergency Source Three-Phase
Phase Option
Test and Inhibit Switches
Time Delay Override Option
Preferred Source Switch
Relay Auxiliary Dry Contacts
Main Shaft Auxiliary Dry Contacts
Meters
Battery Charger
Manual Operation Switches
Audible Alarms
Load Shedding Contacts
Enclosure Space Heater
Remote Communication RS232 or RS485

Appendix Glossary of Abbreviations
Appendix General Controller Information
Appendix Commonly Used Accessories

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