Cummins/Onan C250 / C300N6 — Trip Unit Operation Verification
Testing & diagnosis · Micrologic 5.0 Trip Unit
For the Cummins/Onan C250 / C300N6, from the Cummins/Onan manual.
Applies to: Cummins/Onan C250, Cummins/Onan C300N6, Cummins/Onan GTA855E engine
Procedure
- Set pickup levels.
- Set time delay.
- Use a test kit connected to the trip unit test plug receptacle (A) to verify trip unit is functioning as desired.
Tools required
- test kit Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Ii = 3 x In = 6000 A
- In = 2000 A
- Ir = 0.7 x In = 1400 A
- Isd = 2 x Ir = 2800 A
- tr = 1 s (at 6 x Ir)
- tsd = 0.2 s I2t on
Full service-parts list: Cummins/Onan C250 →, Cummins/Onan C300N6 →
Source: Cummins/Onan 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.