Cummins/Onan OT UCD 280 — Undervoltage Sensor Settings
Adjustments · AC voltage sensor modules
For the Cummins/Onan OT UCD 280, from the Cummins/Onan service manual.
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Before you start
- Use settings which give load protection and yet will avoid nuisance load transfers.
Procedure
- Open the cabinet door.
- Move the operation selector switch to STOP.
- Turn the PICK-UP VOLTAGE knob to the desired pick-up voltage at which load is transferred from the generator set to the normal power source.
- Turn the % DROP-OUT DIFFERENTIAL knob to the desired percent deviation below the pick-up voltage.
- Move the operation selector switch on the engine control to REMOTE for two-wire starting or to NORMAL for three-wire starting.
- Close the cabinet door.
Specs & values
- Example: 108 volts pick-up = 90 percent of nominal voltage for a 120-volt system
- Example: 15 percent drop-out differential from 108 volts = 16-volt differential; drop-out voltage 108 - 16 = 92 volts
- Pick-up voltage scale graduated 90 to 140 volts based on nominal 120 volt system
Source: Cummins/Onan 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.