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I.B. ATS-AG03
Page 19
Effective 7/00
5.4.2 NORMAL POWER SOURCE RESTORATION
• A return to the normal power source begins when the
voltage in all phases of a three-phase sensing unit or
phase-to-phase in a single sensing unit is restored to
a preset value.
• At the preset voltage, the microprocessor will cause
the normal relay to pickup.
• The normal relay closes certain contacts while open-
ing others. This starts the return to the normal power
source and normal transfer switch operation.
• During this sequence, the emergency power source
switch is opened and the normal power source switch
is closed.
• Simultaneously, the engine cool-down relay initiates
the shut down of the engine driven generator.
• Transfer of the load back to the normal power source
is now complete.
Figure 5-5 Switch Being Manually Operated (30-200A
Model)