Kohler — Initial Normal Source Sensing Test
Testing & diagnosis
From a Kohler service manual — check it applies to your exact model before use.
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Before you start
- Hazardous voltage. Only authorized personnel should open the enclosure.
Procedure
- Connect the normal source and verify that the Normal Source Available LED lights; if not, proceed.
- Check for nominal voltage at the ATS contactor lugs (single-phase across NL1-NL2; three-phase across NL1-NL2, NL2-NL3, NL3-NL1).
- If voltage is present at the lugs, check the interface board LEDs and check for voltage at the interface board connectors (single-phase P13-1 and P13-5; three-phase P1-12 to P1-11, P1-11 to P1-4, P1-4
- If no voltage at the interface board connectors, check the wiring from the contactor to the interface board and repair or replace as needed.
- If the voltage exceeds the pickup voltage, the Utility Available LED on the RDC2 controller should light; if not, check communications wiring.
- For the optional ATS status indicator, verify the Utility Available LED and check the status indicator connection to P12.
- Disconnect the normal source and verify the Utility Available LED turns off within a few seconds.
Tools required
- Voltmeter with minimum accuracy of +/-1% Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Undervoltage pickup 90% of nominal
- Undervoltage dropout 90% of pickup
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.