Code Alarm CA-535 Manuel d'utilisateur télécharger pdf (Page 97)

90 Chapter 7 535 User's Manual

Applications

5. Set the value for OUT STEP. This parameter defines the size of bump to be

used. The resulting disturbance must change the process variable by an

amount that significantly exceeds the peak-to-peak process noise, but does

not travel beyond the “normal” process variable range.

6. The next two parameters, LOW LIMIT and HI LIMIT, set the process variable

boundaries. If these boundaries are exceeded during the Pretune, the

pretune cycle will abort and return to manual control at the output level prior

to the initiation of pretune.

Figure 7.12

Pretune TYPE 1, 2 and

3 with Adaptive Tune

➔

NOISE BUMP

➔

ADAPTIVE

• A to B is a 5 second noise band measurement.

• B to C is an open loop bump test to determine initial PID values

and response time.

• C is Pretune completed, so Adaptive PID control begins if ENABLED.

➔

TIME

30%

50%

70%

100%

300

500

700

900

➔

CONTROL

OUTPUT

• A to B is ON/OFF control to determine initial PID values.

• B is Pretune completed, so Adaptive PID control beings if ENABLED.

Note: Noise Band and Resp. Time must be entered before

enabling Adaptive TUne)

TYPE 1 Pretune/Adaptive Control

Out Step

➔

NOISE BUMP

➔

ADAPTIVE

• A to B is a 5 second noise band measurement.

• B to C is an impulse to determine initial PID values and response

time.

• C is Pretune completed, so Adaptive PID control begins if ENABLED.

➔

High Out Limit

Low Out Limit

PRETUNE

ADAPTIVE

Pretune

TIME

Pretune

30%

50%

70%

100%

300

500

700

900

CONTROL

OUTPUT

TYPE 2 Pretune/Adaptive Control

30%

50%

70%

100%

300

500

700

900

CONTROL

OUTPUT

TYPE 3 Pretune/Adaptive Control

1 2 ... 92 93 94 95 96 97 98 99 100 101 102 ... 143 144

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