Kohler MMS, MNS Automatic Transfer Switches Operation and Installation Manual (tp5658)

These Kohler MMS/MNS automatic transfer switches sit between your utility power and generator, usually in commercial buildings, farms, or critical facilities where uptime matters. This manual is what I’d keep on hand when installing a new switch, verifying wiring, or chasing odd transfer behavior. For example, if the switch hesitates to move back to utility after the grid returns, this document walks you through how the system is supposed to operate so you can trace the issue instead of guessing.

Applications & Use Cases

• Install a new ATS correctly, from mounting and wiring to setting it up so it transfers cleanly between sources.
• Verify field wiring and control connections when a unit won’t transfer, chatters, or seems “dead.”
• Check normal operating sequences to confirm if a delay or transfer timing is actually a fault or just programmed behavior.
• Support generator commissioning, making sure the switch and genset talk to each other the way Kohler intended.
• Assist in parts identification, so you know which switch style and rating you’re working on before ordering components.

FAQ

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

A: Yes, it’s practical to use digitally; you can zoom wiring diagrams and search terms instead of flipping pages.

Q: Is it worth printing sections of this manual for field work?

A: Many techs print the key diagrams and procedures they use often, then keep them in a job folder to avoid damaging a full manual onsite.

Safety Note

Always isolate power sources and verify with a meter before removing covers or working inside an automatic transfer switch.

Kohler MMS, MNS Automatic Transfer Switches Index:

Safety Precautions
Introduction
Automatic Transfer Switch Function
Non-automatic Transfer Switch Function
Ratings

Installation
Unpacking
Mounting
Line Connections
Auxiliary Connections

Functional Test
Manual Contactor Operation
Electrical Operation

General Maintenance
Troubleshooting

Sequence of Operation
Normal Source Failure
Normal Source Restoration

Optional Accessories
Time Delays
Front Panel Indicators and Controls
Operation Mode Selector Switches
Optional Panel Lamp Accessories
Auxiliary Relay Contacts
Contactor Auxiliary Contacts
Generator Set Exercising Timer
Battery Charger
Area Protection with Override
Cranking Limiter
Motor Load Transfer / Inphase Monitor or Synch-check Relay
Load-Shedding Contacts

Disconnecting the Inner Control Panel Assembly
To Disconnect the Plug
To Reconnect the Plug

Manual Load Transfer
Wiring Diagrams
Installation Drawings

Kohler