Lakeshore 3f Delta, Operation & Maintenance Manual

Page: 45 / 82

O & M Manual – Insulated Case ATS Rev: October 2020
Publication Number:
MN0100700E Version: V10.01.20
Page 45
4.2.10. Undervoltage Trip Settings for S1 and S2 Sources
Factory Default Settings (Default: Active Protection)

S1 Pick-Up Setting: 90% of the nominal voltage.

S1 Drop-Out Setting: 80% of the nominal voltage.

S2 Pick-Up Setting: 90% of the nominal voltage.

S2 Drop-Out Setting: 80% of the nominal voltage.
NOTE: If these values need to be adjusted, please contact the factory for assistance.
4.2.11. Overvoltage Trip Settings for S1 and S2 Sources
Factory Default Settings (If Applicable)

S1 Pick-Up Setting: 115% of the nominal voltage.

S1 Drop-Out Setting: 120% of the nominal voltage.

S2 Pick-Up Setting: 115% of the nominal voltage.

S2 Drop-Out Setting: 120% of the nominal voltage.
NOTE: If these values need to be adjusted, please contact the factory for assistance.
4.2.12. Under-Frequency Trip Settings for S1 and S2 Sources
Factory Default Settings (If Applicable)

S1 Pick-Up Setting: 58 Hz

S1 Drop-Out Setting: 30 Hz

S2 Pick-Up Setting: 58 Hz

S2 Drop-Out Setting: 30 Hz

The Drop-Out Setting is set to half the frequency to prevent nuisance tripping during gen
loading.
NOTE: If these values need to be adjusted, please contact the factory for assistance.
4.2.13. Over-Frequency Trip Settings for S1 and S2 Sources
Factory Default Settings (If Applicable)

S1 Pick-Up Setting: 58 Hz

S1 Drop-Out Setting: 62 Hz

S2 Pick-Up Setting: 58 Hz

S2 Drop-Out Setting: 62 Hz

The Drop-Out Setting is set to half the frequency to prevent nuisance tripping during gen
loading.
NOTE: If these values need to be adjusted, please contact the factory for assistance.