Auber Instruments SYL-5352P-S Manual de instruções - Página 5

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AUBER INSTRUMENTS

103

SV+Hy

100

SV-Hy

Relay On

Figure 5. On/off control mode.

3) Auto-tune

In most cases the fuzzy logic enhanced PID control is very adaptive and may

work well without changing the initial PID parameters. If not, users may need to

use auto-tune function to let the controller determine the parameters

automatically. If the auto tuning results are not satisfactory, you can manually

fine-tune the PID constants for improved performance. Or you can try to modify

the initial PID values and perform auto tune again. Sometimes the controller will

get the better parameters.

Before auto-tune, please make sure this controller is wired correctly.

Temperature sensor, relay, heater are connected to the controller correctly. Also

confirm your hysteresis band Hy is set to a small number such as 0.5 (default

value). The auto-tune can be started by setting parameter At = 1, then auto-tune

will start automatically. In this ramp/soak controller, user can start the auto-tune

any time when a program is running, on hold, or stopped. When auto-tune is

running, the lower window will flash between "At" and the current set temperature.

During auto tuning, the instrument executes on/off control at the current set

temperature. After 2-3 times on/off action, the microprocessor in the instrument

will analyze the period, amplitude, waveform of the oscillation generated by the

on/off control, and calculate the optimal value for the P, I, and D.

When auto-tune is finished, the lower window will stop flashing "At"; only the set

temperature will be shown in the lower window. Controller will resume running

the program. Generally, you will only need to perform auto tuning once. After the

auto tuning is finished, controller will set parameter "At" to 0 automatically.

To manually stop auto-tuning, please set AT to 0.

For this controller, the auto-tune should not be activated when the controller is

ramping because the result obtained at one temperature is optimized for that

temperature only. The auto-tune should be activated at the most critical

temperature where you need to hold the temperature in tight precision. User

should program a long soak step for the critical temperature and only activate

the auto-tune after the process temperature has reached the set temperature.

For example, if 500˚F is the most import temperature you need to hold in tight,

set r01 = 2000, t01 = 30, C01 = 500, r02 = 0, t02 = 0, C02 = 0. When temperature

reaches 500˚F, set AT = 1 to activate the auto-tune. When auto-tuning is finished,

set the steps back to the original program. The PID parameters obtained at 500˚F

may works fine at temperatures higher than 500˚F (but it may be a little slow).

But these parameters may not work well at lower temperature range.

5.3.4. Cycle time "t"

It is the time period (in seconds) that the controller uses to calculate its output.

The default cycle time is 10 seconds. This controller has output for solid state

relay/resistive load, so user reduces cycle time as low as 2s for higher precision

control.

For example, when t = 2, if the controller decides output should be 10%, the

heater will be on 0.2 second and off 1.8 seconds for every 2 seconds.

5.3.5. Input digital filter "FILt"

If measurement input fluctuates due to noise, then a digital filter can be used to

smooth the input. "FILt" may be configured in the range of 0 to 50. Stronger

2020.06

When heating,

If PV (SV-Hy), relay on

If PV (SV+Hy), relay off

(SV=100, Hy=3)

filtering increases the stability of the readout display, but causes more delay in

the response to change in temperature. FILt = 0 disables the filter. Default FILT

is set to 20.

5.3.6. Hysteresis band "Hy"

The Hysteresis Band parameter Hy is also referred as Dead Band or Differential.

It permits protection of the on/off control from high switching frequency caused

by process input fluctuation. Hysteresis Band parameter is used for on/off control

and auto-tune.

Please note that the cycle time can also affect the action. If the temperature

passes the Hy set point right after the start of a cycle, the controller will not

respond to the Hy set point until the next cycle. If cycle time is set to 20 seconds,

the action can be delay as long as 20 seconds. Users can reduce the cycle time

to avoid the delay.

5.3.7. Decimal point setting "dP"

dP is used to define temperature display resolution.

When dP = 0, temperature display resolution is 1° (C or F).

When dP = 1, temperature display resolution is 0.1° (C or F). The temperature

will be displayed at the resolution of 0.1° for input below 1000° (C or F), and 1°

for input over 1000° (C or F).

5.3.8. Output range limits "OUTL" and "OUTH"

OUTL and OUTH allow you set the output range low and high limit.

OUTL is a useful feature for a system that needs to have a minimum amount of

power as long as the controller is powered. For example, if OUTL = 20, the

controller will maintain a minimum of 20% power output even when input sensor

failed.

OUTH can be used when you have an overpowered heater to control a small

subject. For example, if you set the OUTH = 50, the 5000 Watts heater will be

used as 2500W heater (50%) even when the PID wants to send 100% output.

5.3.9. Configuration Privilege "Lock"

To prevent the parameters and the program being changed accidently, you can

completely or partially lock the parameters and the program after the initial setup.

The configuration privilege is determined by "lock". It can be set to any value

between 0 and 50.

The factory default setting for lock is 0, which means all parameters are unlocked.

It allows all parameters and program steps being viewed and edited during

operation.

When Lock is set to any other value from 1 to 50, all the parameters are locked

and cannot be edited.

Note: In any situation that parameters that are locked, you can always view and

change the "lock" value after you view all field parameters. Change the value will

immediately change the privilege level.

5.3.10. Input selection code for "Sn"

Please see Table 4 for the acceptable sensor type and its range.

Table 4. Code for Sn and its range.

Input device

code

Value

K (thermocouple)

E (thermocouple)

J (thermocouple)

T (thermocouple)

S (thermocouple)

R (thermocouple)

CU50

Cu50 (RTD)

Pt100 (RTD)

PT1

Pt100 (RTD)

PT2

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Display range

(° C)

(° F)

-30 ~ +1300

-22 ~ +2372

-30 ~ +700

-22 ~ +1292

-30 ~ +900

-22 ~ +1652

-199.9 ~ +400

-328 ~ +752

-30 ~ +1600

-22 ~ +2912

-30 ~ +1700

-22 ~ +3092

-50 ~ +150

-58 ~ +302

-199.9 ~ +200.0

-328 ~ +392

-199.9 ~ +600.0

-328 ~ +1112

P5/10