LD250MTC5 LAB datasheet(19/31 Pages) WAVELENGTH

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ADJUST THE SETPOINT

1. Press to access the TC Control Screen.

2. Press the

Setpoint temperature value and

turn the adjustment knob until the desired

temperature is displayed.

The actual temperature of the sensor is displayed in green

and is not editable.

Figure 32. TC Control Screen

The TC Control screen is also the location of the PID control

parameters, and IntelliTune. To change any of the PID values,

press the number and turn the adjustment knob until the

desired value is displayed. To change the IntelliTune mode,

press the mode to cycle through the options.

ENABLE TC CURRENT

Press the

TC ENABLE button. There is no delay before the

button illuminates blue and the current flows. Once the current

is enabled, the actual temperature should move toward the

setpoint temperature.

When the actual temperature is near the setpoint, a green

target symbol is displayed to indicate that the actual

temperature is within the specified tolerance window around

the setpoint. Tolerance is set on the TC Settings screen, see

page 14.

INTELLITUNE:

INTELLIGENT AUTOTUNE

IntelliTune adjusts the PID coefficients, as well as the voltage

limit.

1. Disable all output current.

2. On the TC Control Screen, ensure either

Setpoint Response or Disturbance Rejection is

chosen for

Tune mode:

•

Setpoint Response: This setting has a fast time to

temperature and will overshoot.

•

Disturbance Rejection: This setting has a quick return

to setpoint after stability is reached. It is best for pulsing

lasers or active loads, or if ambient temperature fluctuates.

•

Manual Tuning: Turns IntelliTune off.

3. On the TC Limits screen, set Max/Min Temperature

Limits.

4. Adjust the setpoint off ambient temperature by about 5ºC.

5. Make sure the setpoint will not cause a

sensor bias current change by choosing a

setpoint between 0.075 to 10 V. The scan

is completed at a single bias current level.

For 10 kΩ thermistors the troublesome

temperatures are around -21ºC and 32ºC. For

50 kΩ thermistors, the troublesome temperatures are

around 11ºC and 71ºC.

7. Press to start a characterization scan.

NOTES:

• The process takes three sweeps and can take several minutes.

The “note” icon fills with red to indicate a scan is in progress. If

any portion of the icon is red and you want to stop the process,

press the “note” icon to abort the session. If the session is

aborted, the PID coefficients revert to the previously used

coefficients.

• When the characterization process is complete, the new PID

coefficients display and the icon reverts to green.

• Tune only in temperature mode. Sensor Raw mode is not

supported.

• When IntelliTune is running, the following controls are disabled:

Bias Current Selection, Sensor Selection, Heating Current Limit,

Cooling Current Limit, TEC Limit Voltage, Temperature Setpoint,

Proportional Gain, Integrator Time Constant, Differentiator Time

Constant, IntelliTune Mode.

LD250MTC5 LAB Datasheet(PDF) 19 Page - Wavelength Electronics, Inc.

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