Generac — Verifying Load Shedding Operation - PowerManager Load Shed Transfer Switch

Testing & diagnosis

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

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Procedure

1. Switch the main breaker OFF; make sure any sub-panel primary breaker is in the ON position.
2. Move the non-essential load shed contactor UP to the open (SHED) position.
3. With all branch circuit breakers OFF, switch the main breaker ON; the load shed contactor should automatically move DOWN.
4. If it does not, switch OFF the main breaker, correct the contactor positions and repeat the test.
5. With the generator's main breaker OFF, place the mode switch in MANUAL to start the engine.
6. Check that line-to-line voltage is approximately 240 volts and line-to-neutral is 120 volts.
7. Place the generator in AUTO; the generator will shut down if utility power is present.
8. Switch the generator's main breaker ON; the generator is ready for automatic operation.
9. Shut OFF utility power; the generator should start and the transfer contactor should move to the generator position.
10. Close each breaker in the priority load center one at a time until the generator accepts the entire priority load.
11. Close each breaker in the non-priority sub-panel one at a time; the Load Shed contactor moves UP if the generator becomes overloaded.
12. With the generator carrying the load, recheck gas pressure to verify it is at the same level as before starting.

Source: Generac 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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