Relay 1
Relay 2
Energize
De-Energize
Energize
De-Energize
Backup
Primary
Stop
Relay 1
Relay 2
Energize
De-Energize
Energize
De-Energize
Backup
Primary
Stop
Duplexing
Control
Operation
Alternating
Control
Operation
OPERATION
Step Sixteen
Relay X
Energize
De-Energize
Start
Stop
Automatic
Empty
Operation
Automatic
Fill
Operation
Out of
Bounds
Operation
Relay X
Energize
De-Energize
Stop
Start
Relay X
Energize
De-Energize
High
Low
Functional Chart for Relay On/Off Operations
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