Auber Instruments SKX-400 Instruction Manual - Page 2

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AUBER INSTRUMENTS

4. Parameter Setting

Table 1. Parameter list

Code

Name

Description

System parameters (first layer of menu)

Parameter

LOCK=18, Set data unlock

LocK

lock

LOCK≠18, Set data lock.

Thermocouple: K; E; J; T; S

Input type

RTD: Cu50; Pt2 (pt100)

This parameter is disabled in this

ALP

Alarm type

model.

Cycle time

Output cycle time

Decimal point

Set the position of the decimal point

position

for the measured value.

Display high

P-SH

limit

Input display range.

Display low

P-SL

limit

C: Celsius F: Fahrenheit

If the parameter is changed, the

Display unit

controller needs to run Auto-tuning

again.

Parameters for each channel (second layer of menu)

"n" is the channel number. For example, SP1 is the set value for channel 1

Set Value for

Set the temperature set value (SV)

SP(n)

channel 1 ~ 4

for each channel

Pb is used to set an input offset to

PB(n)

Input offset

compensate the error produced by

the sensor or input signal itself.

Set when PI or PID control is

performance.

Proportional

When P = 0, the controller is

kP(n)

Constant

under ON/OFF mode.

This parameter will in use when it

is not zero.

Eliminates offset occurring in

kI(n)

Integral time

proportional control.

Prevents overshoot and/or

kD(n)

Derivative time

undershoot caused by integral

action effect.

The Hysteresis Band parameter Hy

is also referred as Dead Band, or

Hysteresis

Differential. This permits protection

band (for

of the on/off control from high

Hy(n)

ON/OFF

switching frequency caused by

mode)

process input fluctuation. Hysteresis

Band parameter is used for on/off

control.

1: Auto-tune is ON

AT(n)

Auto tuning

0: Auto-tune is OFF

0: Heating mode

COL(n)

Control mode

1: Cooling mode

2021.11

Setting

Initial

range

Setting

0 ~ 50

0-1

1300

C, F

4.1 Change system parameters (first layer of menu)

Hold SET key for about 3 seconds and you will enter the first level menu.

Channel 1 display will show the parameter name and channel 2 display will

P-SL ~

100

show the parameter value. Press ◄(shift key), ▲ and ▼ keys to change the

P-SH

parameter value. Press SET key to save the change and change to the next

parameter.

± 20.0

0.0

4.2 Change parameters for each channel (second layer of menu)

Hold CH1/CH2/CH3/CH4 key for about 3s to enter the parameters for that

1 ~

100

channel. Similarly, press ◄(shift key), ▲ and ▼ keys to change the

100

parameter value. Press SET key to save the change and change to the next

parameter.

0 ~

500

3000

5. Alarm & output modes

This thermometer has four separate dry relay outputs. They can be used as

0 ~

100S

fully functional PID outputs (relay outputs), or they can be used as absolute

2000S

high/low alarm or ON/OFF control mode.

For absolute high temperature alarm, please set kP(n) to 0 and COL(n) as 1.

So when PV(n) is over SP(n) + Hy(n), output will be enabled. When PV(n) is

0.1 ~

1.0

below SP(n) – Hy(n), output will be disabled.

50.0

For absolute low temperature alarm, please set kP(n) to 0 and COL(n) as 0. So

when PV(n) is below SP(n) - Hy(n), output will be enabled. When PV(n) is over

SP(n) + Hy(n), output will be disabled.

0 ~ 1

ON/OFF mode will be very similar to the alarm above. Please set kP(n) to 0

and set COL(n) to 0 as heating mode and 1 as cooling mode. Then, set the Hy

to the desired range based on control precision requirements. Smaller Hy

values result in tighter temperature control, but also cause the on/off action to

occur more frequently.

Figure 5. Output example. kP(n) = 0, COL(n) = 0. Low temperature alarm or

heating mode. Relay off when PV ≥ SP + SV; relay on when PV ≤ SP – SV.

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Figure 4. Operation flow chart

103

SP+Hy

100

SP-Hy

Relay On

P2/3