Kohler MMS, MNS Automatic Transfer Switches Operation and Installation Manual (tp5678)

These Kohler MMS/MNS automatic transfer switches are usually sitting in a plant room, data center, or utility space, quietly shifting load between utility and generator when the power situation changes. This manual is what I’d keep on hand when I’m installing a new switch, verifying wiring and settings after a service, or chasing down why a unit didn’t transfer during an outage. For example, if the switch hesitates or sticks in one position after a storm, I’d use this document to trace control signals, confirm the operating sequence, and verify the installation matches Kohler’s requirements before swapping any parts.

Applications & Use Cases

• Install a new ATS and route conductors, control wiring, and grounding the way Kohler expects.
• Verify field wiring and settings after a generator or panel upgrade so the switch transfers cleanly.
• Trace transfer problems when the load won’t move to generator or back to utility as commanded.
• Confirm normal operation after maintenance by checking indicators, test functions, and timing behavior.
• Support parts identification by matching switch style and features before ordering components.

FAQ

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

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

Q: Should I still print a copy for the jobsite?

A: I recommend printing the key pages you use often, so you’ve got them even if power or network access is down.

Safety Note

Always isolate power sources and verify the switch is de-energized before opening covers or making any connections.

Kohler MMS, MNS Automatic Transfer Switches Index:

Safety Precautions . . . . . . . . . . . . . . . . . . . . . . i
Service Assistance . . . . . . . . . . . . . . . . . . . . . . I
Service Information . . . . . . . . . . . . . . . . . . . . . . . I
Product Information . . . . . . . . . . . . . . . . . . . . . . . I
Section 1. Introduction . . . . . . . . . . . . . . . . . . . 1-1
Scope and Purpose of Manual . . . . . . . . . . . . . . 1-1
Purpose of Manual . . . . . . . . . . . . . . . . . . . . . . . . 1-1
List of Related Manuals . . . . . . . . . . . . . . . . . . . . 1-1
Arrangement of Manual . . . . . . . . . . . . . . . . . . . . 1-1
Automatic Transfer Switch Description . . . . . . . 1-1
Purpose of Switch . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Components of Switch . . . . . . . . . . . . . . . . . . . . . 1-1
Sequence of Operation . . . . . . . . . . . . . . . . . . . . 1-3
Section 2. Specifications . . . . . . . . . . . . . . . . . 2-1
Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Section 3. Installation . . . . . . . . . . . . . . . . . . . . 3-1
Upon Receipt of Unit . . . . . . . . . . . . . . . . . . . . . . 3-1
Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Mechanical Installation . . . . . . . . . . . . . . . . . . . . 3-1
Lifting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Electrical Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Power Connections . . . . . . . . . . . . . . . . . . . . . . . 3-2
Start Generator Connection . . . . . . . . . . . . . . . . 3-2
Other Accessory Connections . . . . . . . . . . . . . . 3-2
Section 4. Operation . . . . . . . . . . . . . . . . . . . . . 4-1
Switches and Indicators . . . . . . . . . . . . . . . . . . . 4-1
Manual Operation . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Automatic Operation . . . . . . . . . . . . . . . . . . . . . . 4-3
Initial Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
Automatic Operation Procedures . . . . . . . . . . . . 4-3
Section 5. Accessories . . . . . . . . . . . . . . . . . . . 5-1
Program Transition . . . . . . . . . . . . . . . . . . . . . . . 5-1
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
Other Accessories . . . . . . . . . . . . . . . . . . . . . . . . 5-1
Section 6. Diagrams and Drawings . . . . . . . . 6-1
Appendix A. Glossary of Abbreviations . . . A

Kohler