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Home›Repair guides›Kohler›Modbus/KBUS Converter Installation and Connection Procedure

Kohler — Modbus/KBUS Converter Installation and Connection Procedure

Installation · Modbus/KBUS Converter (GM39556)

From a Kohler service manual — check it applies to your exact model before use.

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Before you start

  • Accidental starting can cause severe injury or death. Disconnect battery cables before working on the generator set. Remove the negative (--) lead first.
  • Hazardous voltage. Will cause severe injury or death. Disconnect all power sources before opening the enclosure.
  • Electrostatic discharge (ESD) damages electronic circuit boards. Wear an approved grounding wrist strap.

Procedure

  1. Disable generator sets and disconnect all power sources. Place all generator set master switches in the OFF position.
  2. Disconnect power to all battery chargers, if equipped.
  3. Disconnect all generator set engine starting batteries, negative (--) leads first.
  4. Disconnect all power sources to transfer switches or power monitors.
  5. Turn off and disconnect the power to all devices in the system.
  6. Locate ports and prepare to install converter modules in each device; remove protective covers if required.
  7. Remove the communication module and ribbon cable at the converter location, if present.
  8. ATS only: connect ribbon cable 294638 to P13 on the converter module. 340 genset/power monitor only: connect ribbon cable 352291 to P10.
  9. Install the converter module using the correct spacers (X-712-14 genset, X-712-13 power monitor, X-712-8 ATS).
  10. Install a lock washer X-22-7 and nut X-72-4 on each stud and carefully tighten. Do not overtighten.
  11. ATS only: connect loose end of ribbon cable 294638 to P12 on controller main logic board.
  12. 340 genset controller and power monitor: connect loose end of ribbon cable 352291 to P9 on the device main logic board.
  13. Connect the RS-232 or RS-485 cable to each device.
  14. Replace the covers, close and lock enclosure doors, then make final connections to the PC.
  15. Enable generator sets and restore power. Reconnect batteries, negative (--) leads last. Proceed to Section 9 to configure communications.

Specs & values

  • Torque nuts carefully; overtightening can damage the module

Source: Kohler service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.

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