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Home›Repair guides›Kohler›Three-Source System Connection

Kohler — Three-Source System Connection

Installation · ATS1, ATS2, EBSM, and generators G1/G2

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

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Before you start

  • If the battery connections are reversed, red LED1 or LED2 will light. Incorrect battery connections can damage the battery module.
  • ATS2 requires an external battery module (EBSM) to maintain power to the controller.
  • The closed-in-emergency auxiliary contact used in the engine start circuit of the ATS must be removed from the circuit when used with this three-source control scheme.

Procedure

  1. Connect the utility power source to the normal side of ATS1.
  2. Connect the load to the load side of ATS1.
  3. Connect the emergency side of ATS1 to the load side of ATS2.
  4. Connect generator set 1 to the normal side of ATS2.
  5. Connect generator set 2 to the emergency side of ATS2.
  6. Connect the ATS2 engine start contacts to the engine start circuit on generator set 2 (G2).
  7. Connect one ATS1 programmable output to one ATS2 main logic board programmable input; set to Three-Source System Disable.
  8. Connect one ATS2 programmable output to the engine start connection on generator set 1 (G1).
  9. Connect the generator set starting battery to BATT1 terminals on terminal block TB13 of the EBSM using #14-28 AWG wire.
  10. Set voltage selector switch SW11-1 on the battery module (EBSM) to 12 or 24 VDC.
  11. Assign the ATS1 programmable output to Three-Source System Disable.
  12. Assign ATS2 controller programmable input 1 to Three-Source System Disable.
  13. Assign the ATS2 controller programmable output to Source N Start Signal.

Specs & values

  • Use wire sizes from #14 AWG to #20 AWG for EBSM and I/O module connections.
  • Use #14-28 AWG wire to connect the battery(ies) to the BATT1 terminals on TB13.
  • ATS1 Source type = Util-Gen; ATS2 Source type = Util-Gen-Gen.
  • ATS2 3 Src Engine Start Mode = Mode 1 or Mode 2.

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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