81O

Possible Causes

• •Generator set output frequency drops 2-10 Hz below nominal governor set point for a 5-20 second time delay
• •Generator set output frequency rises 2-10 Hz above nominal governor set point for a 1-20 second time delay
• •Loss of voltage sensing inputs to the control
• •Field overload condition occurs (detected via field voltage)
• •Generator set output frequency falls 2-10 Hz below nominal governor set point for a 5-20 second time delay
• •Generator set operating frequency rises 2-10 Hz above nominal governor set point for a 1-20 second time delay
• •Field overload condition
• •Generator set frequency rises 2-10 Hz above nominal governor set point for a 1-20 second time delay
• •Generator set output frequency drops below adjustable threshold (2-10 Hz below nominal governor set point for 5-20 seconds)
• •Generator set frequency exceeds adjustable threshold (2-10 Hz above nominal governor set point for 1-20 seconds)
• •Generator set output frequency falls 2 - 10 Hz below nominal governor set point for a 5 - 20 second time delay
• •Generator set operates 2 - 10 Hz above nominal governor set point for a 1 - 20 second time delay
• •Under frequency
• •Over frequency
• •Generator set output frequency cannot be maintained
• •Generator set is operating at a potentially damaging frequency level
• •Generator set output frequency drops 2-10 Hz below nominal governor set point for 5-20 seconds
• •Generator set frequency rises 2-10 Hz above nominal governor set point for 1-20 seconds
• •Field overload condition occurs
• •Generator set output frequency drops 2 to 10 Hz below nominal governor set point for a 5 to 20 second time delay

Suggested Actions

1. 1Adjust under frequency settings (adjustable from 2-10 Hz below nominal governor set point, for a 5-20 second time delay)
2. 2Adjust over frequency settings (adjustable from 2-10 Hz above nominal governor set point for a 1-20 second time delay)
3. 3Adjust under frequency settings (2-10 Hz below nominal governor set point, 5-20 second time delay)
4. 4Adjust over frequency settings (2-10 Hz above nominal governor set point, 1-20 second time delay)
5. 5Adjust under frequency settings (2 - 10 Hz below nominal governor set point, for a 5 - 20 second time delay)
6. 6Adjust over frequency settings (2 - 10 Hz above nominal governor set point, for a 1 - 20 second time delay)
7. 7Adjust under frequency settings (adjustable from 2-10 Hz below nominal governor set point, 5-20 second time delay)
8. 8Adjust over frequency settings (adjustable from 2-10 Hz above nominal governor set point, 1-20 second time delay)
9. 9Adjust settings from 2-10 Hz below nominal governor set point, for a 5-20 second time delay
10. 10Adjust settings from 2-10 Hz above nominal governor set point for a 1-20 second time delay
11. 11Under frequency shutdown occurs (adjustable from 2-10 Hz below nominal governor set point, for a 5-20 second time delay)
12. 12Over frequency shutdown or warning occurs (adjustable from 2-10 Hz above nominal governor set point for a 1-20 second time delay)
13. 13Control triggers automatic shutdown of generator set
14. 14Control uses field voltage to trigger a shutdown of the generator set
15. 15Adjust under frequency settings (2-10 Hz below nominal governor set point for a 5-20 second time delay)
16. 16Adjust over frequency settings (2-10 Hz above nominal governor set point for a 1-20 second time delay)
17. 17Adjust under frequency settings (adjustable from 2-10 Hz below nominal governor set point, with a 5-20 second time delay)
18. 18Adjust over frequency settings (adjustable from 2-10 Hz above nominal governor set point, with a 1-20 second time delay)
19. 19Adjust settings from 2-10 Hz below nominal governor set point for a 5-20 second time delay
20. 20Adjust under frequency settings (adjustable from 2-10 Hz below nominal governor set point for a 5-20 second time delay)

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