Watlow 12LS Controller Manuel d'utilisateur télécharger pdf (Page 108)

G-3

Scaling

Enter two values of unscaled process readings RDG

and their corresponding scaled process values PV.

Try to have as near as possible to zero and full

scale. Once entered the 8LS calculates linear

scaling from these values and scales all

subsequent measured data. This should be entered

prior to any other loop data.

Setpoint

The desired control setting. This will be in

engineering units after scaling.

Spread

For heat/cool dual output loops, this entry offsets

the heat and cool control points from the entered

setpoint. The heat will start to control when the

process is one half the spread below the setpoint.

The cool will start to control when the process is

one half the spread above the setpoint. When the

process is between the spread values there is no

control output.

Integral or Reset of the PID. The time constant is

in seconds.

Derivative or Rate of the PID. The time constant

is in seconds.

Units

Three characters that will appear in the display

next to the process variable.

1 2 ... 103 104 105 106 107 108 109 110 111

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Watlow 12LS Controller Manuel d'utilisateur Page 108