Eaton Cutler-Hammer ATVSKDA30300XSU, Instructions Manual

Page: 31 / 40

I.B. ATS-V003
Page 25
Effective 6/98
Normal Source Restoration
• A return to the normal power source begins when the
voltage in all phases of a three phase sensing unit or
line-to-line in a single phase sensing unit is restored to
its operating range.
• At preset levels, the logic starts the return to the nor-
mal power source and normal transfer switch opera-
tion.
• During this sequence, the Emergency Power Source
Switching Device is opened and the Normal Power
Source Switching Device is closed.
• Simultaneously, the logic initiates the shut down of the
engine driven generator.
• Transfer of the load back to the normal power source
is now completed.