States of Cooling System

-: FALSE/CLOSED/OFF, x: TRUE/OPEN/ON, 0: INDIFFERENT/NO-ACTION
    States start:

all conditions

on:

all conditions

off->start:

all conditions

warning:

any x

error->off:

any -/x

check water flow - x 0 0 -
T-clixon x x 0 0 -
<> warning limit T1 - - 0 x 0
> error limit T1 - - 0 - x
<> warning limit P1 or P2 - - 0 x 0
<> error limit P1 or P2 - - 0 - x
> warning limit H2-H1 - - 0 x 0
> error limit H2-H1 - - 0 - x
> warning limit H3-H1 - - 0 x 0
> error limit H3-H1 - - 0 - x
< warning limit airflow - - 0 x 0
< error limit airflow - - 0 - x
action switch CV1/CV2 0 x - 0 0
switch pump 0 x - 0 0
interlock output - x - x x

The corresponding State Transition Diagram of the cooling system is as follows:

STD Cooling System

In the starting_position checking of the status already takes place. Pump and valves are steered, their status can only be checked indirectly.

Last changed on: Wed Jul 28 1999

Please mail suggestions/corrections/updates to Leo Wiggers (wiggers.nikhef.nl)