Wavelength Electronics LFI-3751 Manuel utilisateur

LFI-3751 with Autotune PID

Thermoelectric Temperature Controller

Key Features . . .

•< 0.002°C temperature stability even at ambient

•Controls temperature with thermistors, RTDs, LM335, or AD590

The LFI-3751 with Autotune PID is a high performance

temperature controller speciﬁcally designed for sensitive

applications. Now with Autotune PID capability, the

LFI-3751 automatically optimizes virtually any thermal

load; reduce overshoot or improve temperature stability

with the push of a button.

. . . The Wavelength Advantage

Autotune PID

PID Constants adjustable via front panel

Auto-ranging thermistor & RTD bias current

Bipolar or Unipolar output current operation

High and Low Temperature Limits

Auxiliary temperature sensor input

Analog input allows for external temperature control

(Analog model only)

Addressable RS-232 interface

LFI3751-00400-C Rev D

The Front Panel at a Glance

mV / K

SENSOR

avelength Electronics

5 Amp - 40 Watt

Temperature Controller

POWER

LM335

AD590

Thermistor T , R

3, 3

2, 2

1, 1

RTD

11T , R

A / K

T , R

HOLD FOR LOCAL

RS-232

T , R

mV offset

A offset

T , R

AMPS

RS-232 ADDRESS

VOLTS

PACT T

LIM I

AUX T

TE V

SET T

TE I

ERROR

°C

HOLD SHIFT FOR

OUTPUT

SHIFT

MODEL LFI-3751

STATUS

TEMP LIMIT

REMOTE

T LIMIT LIMIT I

SENSOR

Off

Status Section

4 Digit Display

Display

Select

Switch

Sensor

Reference

Section

AC Power Switch

Digi-Pot

Adjust Knob

Display

Section

Units of

Measure

Shift Button

Output Section

}

Temp Limit

Button

Output Button

While displayed, Parameter

can be changed by rotating

Digi-Pot Adjust Knob

is disabled. Monitor

parameter only.

LED is OFF

LED is lit SOLID

LED FLASHES

Front Panel Operations at a Glance

Operation Legend

Adjusting Limit Current

Rotate the Display Select Switch to LIM I.

Positive Limit Current (0 to +5 Amps) will

alternate with the Negative Limit Current

(-5 to 0 Amps).

LIMIT I LIMIT I LED ﬂashes:

TE Current is limited by

LIM I settings.

WAIT - Most thermal loads require maximum

current while initially controlling to temperature.

To control properly, the output current must be

less than the LIM I current setting.

CAUTION: Improperly set LIM I

can damage your thermoelectric

Limit Current LED

ERROR

SENSOR

OUTPUT

IS SENSOR

ERROR CONDITION

CORRECTED?

BEEP

OUTPUT

BEEPS

LONG

BEEP

IS SENSOR

ERROR

CONDITION

CORRECTED?

YES

PRESS

OUTPUT

BUTTON

SENSOR ERROR LED

ﬂashes: Sensor is either

OPEN or SHORTED. Output

forced OFF.

Press Output Button to

re-enable output current.

Press Output Button

to clear error.

Sensor Error LED & Correcting the Sensor Error

T LIMIT

OUTPUT

OVER / UNDER

TEMPERATURE

CONDITION

CORRECTED?

OUTPUT

BEEP

BEEPS

LONG

BEEP

OVER / UNDER

TEMPERATURE

CONDITION

CORRECTED?

YES

PRESS

OUTPUT

BUTTON

T LIMIT LED ﬂashes:

Sensor temperature is

outside temperature

limits. Output is disabled.

Press Output Button to

re-enable output current.

Press Output Button to

clear error.

Temperature Limit LED & Correcting the Temperature Limit Error

Press &

Release

TEMP LIMIT

TEMP LIMIT 1

°C°C

TEMP LIMIT 2

(Cycles three times, then reverts to prior display)

T LIMIT

Adjusting Temperature Limits : -199.9 to +199.9°C

PACT T

LIM I

AUX T

TE V

SET T

TE I

AMPS

PACT T

LIM I

AUX T

TE V

SET T

TE I

AMPS

Negative LIM I

Positive LIM I

Note: Temperature Limit does not

operate in Resistance Mode for

thermistors or RTDs.

ONON PRESS &

RELEASE

PRESS &

RELEASE

Output Current

Disabled

Output Current

Enabled

Output Curren

Disabled

Enable / Disable Output Current

Press & Hold

for more than

3 seconds

TEMP LIMIT

BUTTON

RS-232

REMOTE

RS-232

REMOTE

OPERATE VIA

RS-232

REVERT TO

LOCAL OPERATION

Revert to Local Mode Operation

RS-232

REMOTE

BEEP

REMOTE RS-232 LED ﬂashes,

unit BEEPS:

RS-232 communication is

initiated and the port is active.

A ﬂashing RS-232 LED indicates active communication

between computer and instrument

Remote RS-232 LED

A solid RS-232 LED indicates the instrument is under

remote RS-232 control, but communication between

computer and instrument is not active.

RS-232

REMOTE

SHIFT

BEEP BEEP

Continuously

Hold the Shift

Button

After 3 seconds, REMOTE RS-232

LED lights solid red, unit beeps.

RS-232 Address

Displayed while Shift

Button is held. When

Button released, new

address (if changed) is

saved and unit beeps.

Adjusting RS-232 Address

TEMP LIMIT

BUTTON

Remote RS-232

Operation

Output shuts off,

Unit remains in

RS-232 operation

Press and Hold

TEMP LIMIT and Press

OUTPUT BUTTON to

shut output off

OUTPUT

RS-232

REMOTE

RS-232

REMOTE

Enable / Disable Output Current During Continuous RS-232 Operation

The Front Panel at a Glance

Quick Autotune PID Operation

Step 1. Adjust the Limit Current below the rated

maximum current for your thermoelectric or

resistive heater.

Step 2. Adjust the Temperature Setpoint to your desired

operating temperature.

PACT T

LIM I

AUX T

TE V

SET T

TE I

AMPS

PACT T

LIM I

AUX T

TE V

SET T

TE I

AMPS

Negative LIM I

Positive LIM I

(-5.00 to 0.00 Amps)

decrease

increase

(0.00 to 5.00 Amps)

Ω

PACT T

LIM I

AUX T

TE V

SET T

TE I

°C

temperature (°C)

or resistance (kΩ)

displayed

-199.9˚C to +199.9˚C

0 to 500 kΩ

decrease

increase

Continued next page...

Step 3. Adjust the P term to display AutS or Autd.

AutS: Setpoint Response Optimization

Autd: Disturbance Rejection Optimization

(Wait about two seconds before enabling the

output current.)

Step 4. Begin Autotune Optimization: Enable Output

Current.

The time to complete an Autotune optimization

sequence varies from load to load. While tuning,

the ON LED will ﬂash. When complete, the

LFI-3751 beeps once and the ON LED lights solid.

Three audible beeps indicate if the Autotune

sequence is aborted. The ON LED is not lit. If the

actual sensor temperature exceeds the high or low

temperature limits the optimization will abort.

See Page 23 for more detail on the LFI-3751

Autotune feature.

The Front Panel at a Glance

Quick Autotune PID Operation

Quick Autotune PID Operation, continued

PACT T

LIM I

AUX T

TE V

SET T

TE I

decrease

increase

AutS or Autd (below 0)

ON PRESS &

RELEASE

Output Current

Disabled

Autotune

Optimization

in Progress,

ON LED flashes

Autotune

Complete

BEEP

Phase 1: The LFI-3751 ramps the thermoelectric

current to drive the load toward the setpoint

temperature.

Phase 2: The LFI-3751 performs three characterization

passes.

Phase 3: The LFI-3751 reverts to normal operation,

saving the optimized P, I, and D settings in

non-volatile memory and settling in at the

setpoint temperature.

Ambient

Phase 1

First

Pass

Setpoint

Phase 2 Phase 3

Second

Pass

Third

Pass

Autotune Process

Thermistors or

RTDs (T, R) data

[C1]

[C2]

Thermistors or

RTDs (T, R) data AD590, LM335,

Slope

[B1] only

[B1]

[B2]

[A1]

[A2]

OFF (0)

1 to 100 secs.

OFF (0)

0.4 to 10.0 secs.

AutS or Autd

(Autotune PID)

1 to 100 Amps / Volt

°C

k Ω

°C

k Ω

°C

AD590, LM335,

Offset

[C1] only

k Ω

SHIFT

OFF

-8.00°C to +150.00°C

(typical)

AMPS

POSITIVE

NEGATIVE

AMPS

-12.0 to +12.0 Volts VOLTS

-199.9°C to +199.9°C

0 to 500 k Ω

- 5.00 to +5.00 Amps AMPS

-199.9°C to +199.9°C

0 to 500 k Ω

°C

k Ω

°C

k Ω

°C

PACT T

SET T

TE I

LIM I

AUX T

0.00 to +5.00 Amps

-5.00 to 0.00 Amps

TE V A

SHIFT

Thermistor

RTD

AD590

LM335

10°C

25°C

0°C

1 µA / K

10 mV / K

19.9 kΩ

10 kΩ

0.100 kΩ

40°C

100°C

0 µA

0 mV

5.326 kΩ

0.139 kΩ

Default Sensor Conﬁguration

The Front Panel at a Glance

Displaying and Adjusting Values on the Front Panel

Display Section

A B C

Sensor Type [A1] [A2] [B1] [B2] [C1] [C2]

Rear Panel at a Glance

115/230 VAC, 50/60 Hz, 160 VA

CAUTION

Do Not Open

Risk of Electrical Shock

Ne Pas Ouvrir

Risque d’ Electrocution

ATTENTION

VORSICHT

Hochspannung

Nicht ffnen

MADE IN USA

SELECT:

(5x20mm SLO BLO)

FUSE (250V):

2000 maT @ 115V

1000 maT @ 230V

Wavelength Electronics

Bozeman, Montana USA

OUTPUT

8F0-2995S/N

LINE:

ANALOG

INPUT

RS-232 OUTPUT

RS-232 INPUT

115V

Analog Input

BNC Connector

Output

Connector

(9 pin male

D-sub plug)

RS-232 Input

Connector

(25 pin female

D-sub receptacle)

RS-232 Output

Connector

(25 pin male

D-sub plug)

AC Voltage

Select Switch

Do not change this

setting while power is

supplied to the unit.

AC Fuse

For 115 VAC operation, install a 2000 maT 5 x 20 mm SLO BLO fuse

For 230 VAC operation, install a 1000 maT 5 x 20 mm SLO BLO fuse

AC Power

Entry Module

Use only the power cable

provided. Ensure that the

power source you plug

the LFI-3751 into is

properly grounded.

Serial

Number

Fan Vent Holes

Do Not Block or place

any objects within 6" of

the rear panel of

this instrument.

25 25

13 13

14 14

Earth Ground

If your AC power system

does not bring earth

ground through the

AC Power Entry Module,

connect earth ground

via a 16 AWG wire to

this screw terminal.

TEC +

TEC -

Aux Sensor +

*Sensor -

Main Sensor +

AD590 Voltage

*Fan -

*Fan+ (+12 V)

*-12 V

5, 6, 8, & 20 shorted

All other pins are ﬂoating

Instrument Receive (In)

Instrument Transmit (Out)

Signal Ground

All other pins are ﬂoating

Peripheral Transmit (Out)

Peripheral Receive (In)

Signal Ground

Output

9 pin male D-sub plug

RS-232 Input

25 pin female D-sub receptacle

RS-232 Output

25 pin male D-sub plug

*Thermally Fused to 100 mA

In This Book

Quick Start. Chapter 1 prepares the temperature controller for

use and familiarizes you with a few of its features.

Front Panel Operation. Chapter 2 details the features and

functions of the front panel. You will ﬁnd this chapter useful

whether you are operating from the front panel or from the

RS-232 interface.

Rear Panel Operation. Chapter 3 details the rear panel

features and connector pin outs.

Remote Interface Reference. Chapter 4 details the RS-232

commands and responses. Remote interface programs are

provided to help you develop programs for your temperature

control application.

Specifications. Chapter 5 lists the temperature controller

speciﬁcations.

If your LFI-3751 fails within one year of purchase, Wavelength

Electronics will repair it free of charge. If you have questions

relating to the operation of the LFI-3751, you can contact

Technical Support:

Call (406) 587-4910 in the U.S.

Fax (406) 587-4911

email sales@teamwavelength.com

If you have purchased the controller from an international

distributor, please contact them for technical support or

repairs.

This page intentionally left blank.

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