Kohler — Verify Generator Operation
Testing & diagnosis · Paralleling system
From a Kohler service manual covering: 125REZGT, 145REOZT4, 175REOZT4, 30REZG, 35 REOZT4, 45 REOZT4, 50REZG, 55REOZT4, 70REZGT, GM88594-KP1-QS, REOZT4. Check it applies to your exact model before use.
Applies to: Kohler 125REZGT, Kohler 145REOZT4, Kohler 175REOZT4, Kohler 30REZG, Kohler 35 REOZT4, Kohler 45 REOZT4, Kohler 50REZG, Kohler 55REOZT4, Kohler 70REZGT
Before you start
- Generators must all operate at the same frequency, voltage, and phase connection in order to parallel.
Procedure
- Ensure the load is not connected or is drawing less power than a single generator can provide.
- Navigate to CONTROLLER CONFIG -> COMMUNICATION SETUP and verify PGEN Nodes Online indicates the correct number of nodes.
- Verify alternator connection (voltage selector switch position), system voltage, and voltage regulator target on each generator.
- Start a single generator by pressing the Run button; the paralleling box contactor should close and the Generator Connected to Bus indicator should light.
- Verify bus and generator voltages match and generator to bus phase angle is between -10 and 10 degrees.
- Verify the load bus is energized and available at the load.
- Stop the generator by pressing the OFF button; the contactor should open.
- Repeat for each generator in the paralleling system.
Tools required
- SiteTech software Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Generator to bus phase angle should be between -10 and 10 degrees
Full service-parts list: Kohler 125REZGT →, Kohler 145REOZT4 →, Kohler 175REOZT4 →, Kohler 30REZG →, Kohler 35 REOZT4 →, Kohler 45 REOZT4 →, Kohler 50REZG →, Kohler 55REOZT4 →, Kohler 70REZGT →
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.