Part

Function

Function statuses (definition)

P1

TF1 to give head

1―Active (pump drains current)

0―Inactive (no current)

P2

TF2 to give backup head

1―Active (pump drains current)

0―Inactive (no current)

V1

TF3 to isolate inlet

1―Active (valve closed switch pressed)

0―Inactive (valve open switch pressed)

V2

TF4 to isolate outlet

1―Active (valve closed switch pressed)

0―Inactive (valve open switch pressed)

C1

TF5 to cut P1 supply

1―Active (circuit breaker is open)

0―Inactive (circuit breaker closed)

C2

TF6 to cut P2 supply

1―Active (circuit breaker is open)

0―Inactive (circuit breaker closed)