Micromod MOD: Modcell 2050R Users Guide Manual de usuario descargar pdf (Pagina 175)

IB-23C650

RAMP/SOAK OPERATION

DESCRIPTION OF RAMP/SOAK PROFILE

The Ramp/Soak Profile option complements any type of control

implementation by adding a ramp/soak set-point profile with up to 10 ramp or

soak segments. The ramp function changes the local set-point up or down at

a specified rate. The soak function maintains the set-point at a fixed value for

a specified period of time. Figure 19 shows a typical profile and some of its

features. The profile is run in either hours or minutes and each segment can

contain up to 30,000 units of time. Ramp/Soak features include: repeating a

profile, resetting a profile, skipping segments, guaranteed ramps and soaks,

and three segment event states using output relays A, B and C. When all

three event states are enabled, high or low alarm outputs are not available.

The process variable may be either a temperature or electrical input. When

ramp/soak is running with the controller in automatic, the control algorithm

receives an active local set-point which changes as a function of the

ramp/soak profile. The control algorithm performs its normal function of

calculating an output which will bring the process variable to the set-point

based on the configuration of the P, I, D, or on/off responses.

When the controller is in automatic, ramp/soak can be set for either run or hold

using the scroll and up/down keys. When ramp/soak is on hold, the set-point

can be adjusted using the up/down keys. When ramp/soak is switched back

to run, the profile is started at the point where it was held. When the switch is

made, any difference between the adjusted set-point value and the profile

value causes a step change in the active set-point.

When control is switched to manual, the ramp/soak profile pauses and the

output value can be changed via the up/down keys. Output adjustment while

in manual is from 0 to 100% of span. The switch from manual back to

automatic is not bumpless. If the process value is at 70% in manual and the

ramp or soak profile segment calls for 80%, the switch to automatic

immediately causes the process to begin changing to the 80% value.

When ramp/soak is running, the remote set-point cannot be made active and

autotune cannot be entered. If the remote set-point is active, ramp/soak

cannot be started in the DISPLAYS MENU.

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Micromod MOD: Modcell 2050R Users Guide Manual de usuario Pagina 175