Ramp - Brainchild C21 User Manual

Auto-tune fuzzy / pid process / temperature controller

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Example for C91:

Set OUT2=PVLO, LOCK=NONE, SEL1=INPT, SEL2=UNIT, SEL3=DP ,

SEL4~SEL8=NONE, then the display scrolling for C91 becomes

3 - 6 Ramp

The ramping function is performed during power up as well as any

time the set point is changed. Choose MINR or HRR for RAMP , the

unit will perform the ramping function. The ramp rate is programmed

by adjusting RR. The ramping function is disabled as soon as the

failure mode, the manual control mode, the auto-tuning mode or the

calibration mode occurs.

Example without Dwell Timer

Select MINR for RAMP , selects C for UNIT, selects 1-DP for DP , Set

RR= 10.0. SV is set to 200 C initially, and changed to 100 C after 30

minutes since power up. The starting temperature is 30 C. After

power up the process is running like the curve shown below:

200

100

Note: When the ramp function is used, the display will show the

current ramping value. However it will revert to show the set point

value as soon as the up or down key is touched for adjustment. The

ramping value is initiated to process value either as power up or RR

and /or set point are changed. Setting RR to zero means no ramp

function at all.

SP1

SP2

UM0C911B

MAN

Figure 3.5 RAMP Function

Time

(minutes)

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C91