Kohler M340 Automatic Transfer Switches Operation and Installation Manual (tp5569)

In the field, these Kohler M340 automatic transfer switches are usually sitting in electrical rooms or outdoor enclosures, quietly handling the changeover between utility and generator power. This manual is what I keep handy when I’m installing a new switch, verifying the control logic, or explaining operation to a facility tech. If, for example, the switch isn’t transferring back to utility after a power return, I’ll use this document to trace the control signals, confirm settings, and verify we’re wired and operated the way Kohler intended.

Applications & Use Cases

• Guide a new installation, from mounting and routing conductors to making sure control wiring is landed correctly.
• Verify operating sequences when testing generator start, transfer, and retransfer under simulated outages.
• Troubleshoot nuisance faults by isolating whether the issue is in sensing, controls, or mechanical movement.
• Confirm user operation steps so on-site staff know how to place the switch in manual or automatic without damaging anything.
• Support parts replacement by matching components and ensuring correct reassembly and adjustment.

FAQ

Q: Can I keep this manual on a tablet in the electrical room?

A: Yes, it’s practical to use digitally; you can zoom diagrams and search text while you’re in front of the switch.

Q: Should I print the whole manual or just a few pages?

A: Most techs print the key procedures and diagrams they use often, then keep the full manual as a digital backup.

Safety Note

Always isolate all power sources and verify absence of voltage before opening or working inside the transfer switch.

Kohler M340 Automatic Transfer Switches Index:

Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . i
Interpreting a Transfer Switch Part Number . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iv
Local Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
LED Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Programming Mode Switch Positions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Control Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
LCD Display Summaries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
LCD Display Menus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Display Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Programming Mode Switch Off/Remote . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Normal-Source Voltage & Frequency— Index 1 . . . . . . . . . . . . . . . . . . . . . . . . . 7
Emergency-Source Voltage & Frequency— Index 2 . . . . . . . . . . . . . . . . . . . . . . 8
Records, Total & Resetable— Index 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Clock & Calendar— Index 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Time Delays— Index 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Normal Source Voltage & Hz Settings & Set Points— Index 6 . . . . . . . . . . . . . 12
Emergency Source Voltage & Hz Settings & Trip Points— Index 7 . . . . . . . . . 14
Plant Exerciser Settings— Index 8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Load Shed Settings— Index 9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Source History— Index 10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Installed Control Options— Index 11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Voltage Sensing Calibration— Index 12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Remote Control & Monitoring Settings– index 13 . . . . . . . . . . . . . . . . . . . . . . . . 27
Programming Mode Switch Local . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Records, Total & Resettable— Index 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Clock & Calendar— Index 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Time Delays— Index 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Normal Source Voltage and Frequency, Set Points— Index 6 . . . . . . . . . . . . . . 32
Emergency Source Voltage and Frequency, Set Points— Index 7 . . . . . . . . . . 35
PlantExerciserSettings— Index 8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Load Shed Settings— Index 9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Load Shed Settings— Index 9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Voltage Sensing Calibration— Index 12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
RemoteControl & Monitoring Settings— Index 13 . . . . . . . . . . . . . . . . . . . . . . . . 49
Microprocessor-Controlled Transfer Logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Appendix I, General Message Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
Appendix II, Source History Message Summary . . . . . . . . . . . . . . . . . . . . . . . . . 69
Appendix III, System Alert Message Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
Appendix IV, Setting Ranges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
Appendix V, Local/Remote/Network Communications Installation . . . . . . . . . 71

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