Auber SWA-2451A Instruction Manual - Page 3

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AUBER INSTRUMENTS

will take effect without the need for pressing the SET key. Figure 5 shows the

flow chart of the parameters.

Note: If the controller is locked (see 4.13), only limited parameters (or no

parameters) can be changed.

4.2 Parameter Name, Range and Initial Setting

4.2.1 Alarm parameters

This controller has two alarm outputs: Alarm 1 (AL1, NO relay) and Alarm 2

(AL2, NO relay). Two red alarm indicators are located on the front panel: AL1

and AL2. Alarm 1 and AL1 indicator are synchronized. Alarm 2 and AL2

indicator are synchronized. When the AL1 (AL2) indicator is ON, alarm 1 (alarm

2) relay pulls in. When the AL1 (AL2) indicator is OFF, alarm 1 (alarm 2) relay

drops off.

Each alarm is set by three parameters: ALP, AL and Hy. ALP1, AL1 and Hy1

are for Alarm 1. ALP2, AL2 and Hy2 are for Alarm 2. Alarm 1 can be set as

either temperature alarm (ALP1 = 1 ~ 4) or timer alarm/output (ALP1 = 0).

Alarm 2 can only be used for temperature alarm (ALP2 = 1 ~ 4). See ALP

definition below.

"ALP" defines the type of alarm.

ALP = 0, timer alarm/output (alarm 1 only)

ALP = 1, high limit temperature alarm.

ALP = 2; low limit temperature alarm.

ALP = 3; deviation high temperature alarm.

ALP = 4, deviation low temperature alarm.

Note: When ALP1 is set to 0 (for timer output), parameter AL1 and Hy1 are not

in use. Only ALP1 can be set to 0. ALP2 = 0 is not functional for SWA-2451A.

"AL" is for the alarm temperature setting. When alarm is set for high/low limit

alarm, its value is the temperature that alarm will turn on. When alarm is set for

high/low deviation alarm, its value indicates that the alarm will turn on when

temperature is deviated AL degree from the set temperature (SV). Note: when

alarm is set to deviation alarm (ALP1 / ALP2 is set to either 3 or 4), AL1 / AL2

can only be set to 100 as maximum.

"Hy" is the hysteresis band of temperature alarm. This parameter also uses for

ON/OFF control mode (see 4.2.2 below). In heating mode, for high limit or

deviation high alarm mode, the alarm will turn off when the temperature is Hy

degree below alarm on setting; for low limit and deviation low alarm mode, the

alarm will turn off when temperature is Hy degree above the alarm on setting.

Example 1: ALP1 = 1 (high limit alarm), AL1 = 250, and Hy1 = 5. In this case,

alarm 1 will turn on when temperature goes above 250 degrees (AL1) and turn

off when temperature drop to 245 degrees (AL1-Hy1).

Example 2: SV = 200, ALP1 = 4 (deviation low alarm), AL1 = 10, and Hy1 = 5.

In this case, alarm 1 will turn on when temperature drop to 190(SV-AL1) and

turn off when temperature goes up to 195 (SV-AL1+Hy1).

4.2.2 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, as well as auto-tune process. For example: When

controller is set for on/off heating control mode, the output will turn off when

temperature goes above SV+ Hy and on again when it drops to below SV-Hy.

4.2.3 At (Auto-tuning)

The auto-tuning function (also called self-tuning) can automatically optimize the

PID parameters for the system. The auto-tuning function will use the on/off

mode to heat up the system until it passes the set point. Then let it cool down. It

will repeat this about three times. Based on the response time of the system,

the built-in artificial intelligence program will calculate and set the PID

parameters for the controller. If your system has a very slow response, the auto

tuning could take a long time.

2019.01

To activate auto-tuning, enter the parameter setting mode, set At = ON. The

"AT" LED on the left lower corner of the controller will light up. Auto-tune will

finish when the AT LED turns off. The newly calculated PID parameters are set

and used for the system. Please note that auto-tuning is only for PID control

mode. There is no need for auto-tune when using ON/OFF mode (when P = 0).

To stop the auto-tuning, enter the parameter setting mode, set At = OFF. Then,

the previous PID parameters values are resumed.

85.5

Time

SET 3S

AL1

999.9

Alarm1 Setting

SET

AL2

Alarm2 Setting

SET

0.0

Input Offset

SET

15.0

Proportional Constant

SET

240

Integral Time

SET

Derivative Time

SET

OFF

Auto Tune

SET

Cycle Time

SET

1.0

Hysteresi s Band

SET

Hy1

Hy 1

1.0

Alarm 1 Hysteresi s Band

SET

Hy2

Hy 2

1.0

Alarm 2 Hysteresi s Band

SET

Deci m al Point Position

SET

Figure 5. System setup flow chart.

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Display Unit

SET

dih

DIH

999.9

Input High Limit

SET

Dil

DIL

Input Low Limit

SET

OPA

Output Mode

SET

Input Type

SET

LOCK

Lock

Configuration Privi l ege

SET

OPPO

Output Power

SET

COOL

Cool

OFF

Cooling Control

SET

ALP2

ALP 2

Alarm 2 Definition

SET

ALP1

ALP 1

Alarm 1 Definition

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