Auber Instruments SWA-2451B Gebrauchsanweisung - Seite 4

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AUBER INSTRUMENTS

Table 2. System parameters.

Mode 2: Press ▲ key for 3 seconds then release

Code

Sign

Description

Set Value

Mode 5: Press SET key for 3 seconds then release

AL1

Alarm 1 setting

AL1

AL2

Alarm 2 setting

AL2

Input offset

Proportional Constant

Integral time

Derivative time / delay

time

Auto-tune

Cycle time

Hysteresis band

Alarm 1 hysteresis

Hy1

band

Alarm 2 hysteresis

Hy2

band

Decimal point position

ALP1

Alarm 1 definition

ALP2

Alarm 2 definition

CooL COOL

Cooling control

outh

outH

Output high limit

Lock

Configuration privilege

Input type

OPA

Output Mode

OPA

DIL

Input low limit

dIL

DIH

Input high limit

dIH

Display unit

Mode 3: Press ▼ key for 3 seconds and release

TE1

Timer 1

tE1

Te2

TE2

Timer 2

Timer unit and timer

UPT

mode

INT

Timer control mode

INT

4.3 Control action explanations

4.3.1 PID

The values of the P, I, and D parameters are critical for good response time,

accuracy and stability of the system. Using the Auto-Tune function to

automatically determine these parameters is recommended for the first time

user. If the auto tuning result is not satisfactory, you can manually fine-tune the

PID constants for improved performance.

Proportional Constant (P): P is also called the proportional band. Its unit is

the degree of temperature. For example, P = 50 means the proportional band

is 50 degrees. Assuming the set temperature SV = 200. When integral, I, and

derivative, d, actions are removed - the controller output power will change

from 100% to 0% when temperature increases from 150 to 200 ° C. The

smaller the P value is, the stronger action will be for the same temperature

difference between SV and PV. Please note: for on/off control mode, P is

set to 0.

Integral time (I): Brings the system up to the set value by adding to the output

that is proportional to how far the process value (PV) is from the set value (SV)

2021.01

Initial

Setting Range

Remark

Setting

Decided by DIL, DIH

100

-1999 ~ +9999 ˚C or ˚F

999.9

-1999 ~ +9999 ˚C or ˚F

0.0

-20 ~ 20

0.0

0.1 ~ 200.0

15.0

0 ~ 2000

240

0 ~ 200

On/off

Off

2 ~ 120

2 or 120

0.1 ~100.0

1.0

0.1 ~100.0

1.0

0.1 ~100.0

1.0

0 or 1

0 ~ 4

On/Off

Off

0 ~ 100%

100

0 ~ 50

See Table 3

-1999 ~ DIH

0.0

dIL ~ 9999

999.9

C, F

0 ~ 9999

0 ~ 3

0 ~ 8

and how long it has been there. When I decreases, the response speed is

faster but the system is less stable. When I increases, the response speed is

slower, but the system is more stable. When I = 0, the integration is turned off.

It becomes to a PD controller that is useful for very slow system.

Derivative time (d): Responds to the rate of PV change, so that the controller

can compensate in advance before |SV-PV| gets too big. A larger number

increases its action. Setting d-value too small or too large would decrease

system stability, causing oscillation or even non-convergence. Normally, d is

4.2.1

set to ¼ of the I value. However, when the controller is in on/off mode (P = 0)

and cooling control is turned on, d means Delay Timer of the Anti-Short Cycle

4.10

Delay (Asd) function. The delay time ranges from 1-200 minutes. (See 4.3.3

for details).

4.3.1

4.3.2 On/off control mode

It is necessary for inductive loads such as motors, compressors, or solenoid

valves that do not like to take pulsed power. It works like a mechanical

4.2.3

thermostat. When the temperature passes the SV+Hy, the heater will turn off.

4.4

When the temperature drops back to SV-Hy, the heater will turn on again. (In

cooling mode, the cooler turns on when temperature passes SV+Hy, and turns

4.2.2

off when temperature drops back to SV-Hy). To use the on/off mode, set P =

0 and Hy to the desired band. Then I and D parameters are not used when

4.2.1

controller is in heating mode. It can be left at any value. In the cooling mode,

the D value is used for Anti-Short Delay time. Its value is in minutes (See 4.3.3

for details).

4.6

4.3.3 Cooling control

4.2.1

When controller is used for cooling control and load is a compressor, it should

not turn on the compressor when its refrigerant is at high pressure (just after

4.10

turned off). Otherwise, the compressor can be damaged in short time. Two

methods are commonly used to prevent the rapid cycling of the compressor.

4.12

One is to use on/off control mode (instead of the PID control mode) with wide

4.13

enough hysteresis band, and long cycle rate. The other is to use the Anti-Short

Cycle Delay (ASd) function. ASd establishes the minimum time that the N.O.

4.5

contacts remain open (after reaching cutout) before closing again. The delay

4.9

overrides any Load Demand and does not allow the N.O. contacts to close until

the set time-delay value has elapsed. ASd gives time to release the refrigerant

4.7

pressure through evaporator. This controller allows the user to use both

methods to protect the compressor. You should set the P = 0 for on/off mode.

4.11

Hy should not be less than 2 degrees unless you really need a tight control. The

cycle rate should be set for 20 second or longer. The D is typically set to 4- 6

(minutes).

4.14

4.3.4 Manual mode

Manual mode allows the user to control the output as a percentage of the total

4.15

heater power. It is like a dial on a stove. The output is independent of the

temperature sensor reading. One application example is controlling the strength

4.16

of boiling during beer brewing. You can use the manual mode to control the

boiling so that it will not boil over to make a mess. The manual mode can be

switched from PID mode but not from on/off mode. This controller offers a

"bumpless" switch from the PID to manual mode. If the controller outputs 75%

of power at PID mode, the controller will stay at 75% when it is switched to the

manual mode, until it is adjusted manually. See Figure 3 for how to switch the

display mode. To activate the manual control, pressing the ◄ key for 3

seconds or until the bottom display shows H at the most left digit. The H

indicating the controller is in manual mode. The number at the right is the

percentage of output. Press the ▼or ▲key to adjust the power. To switch back

to PID mode, pressing the ◄ key for 3 seconds or until the H disappeared.

4.4 Cycle time "t"

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

e.g. 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. Smaller t values

result in more precision control. For SSR output, t is recommended for 2 (2

seconds).

4.5 Input sensor type for "Sn"

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