TEC Controller Setup Guide - Meerstetter Engineering, GmbH

TEC Controller Setup Guide - Meerstetter Engineering, GmbH
TEC Controller Setup Guide
This step by step guide will help you setting up a Meerstetter Engineering TEC controller for
the first time.
Goal:
•
Avoid difficulties and save time at first use
•
Get familiar with the TEC Service Software
As an example application we set up a system to keep an object at a constant temperature.
This means that the TEC controller will supply a Peltier element, to heat and cool depending
on the measured temperature at the object.
Important: We assume that you set up a new TEC controller with default settings. If not
please load the default settings in the service software from the CD or from the software
package available on our website.
(CD: TEC_G01\Software\5134P TEC Default Config.ini)
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http://www.meerstetter.ch
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TEC Controller Setup Guide
During the setup we will perform the following steps:
1. Software Installation
2. Prepare the mechanical setup
3. Adjust settings for the TEC controller in the Meerstetter Engineering’s service software
4. Test the cooling functionality of our setup
5. Adjust settings for temperature controlling
6. Auto tuning
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Material
TEC Controller Setup Guide
Materials used for this example:
•
TEC-1089-SV-NTC39K controller
•
Peltier Element (CUI Inc. CP40236)
•
Heat Sink
•
PC with Microsoft Windows 8
•
CD with Meerstetter Engineering’s Service Software
•
Cable with mini USB-B connector
•
Temperature Sensor (NTC 10K, B value = 3988K)
•
Power Supply (24 V, 6 A output)
This is a general TEC setup guide. So you can follow the steps even if you don’t use exactly
the same material and controller for the setup.
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How to use this guide
Red boxes are actions to be performed by
yourself
TEC Controller Setup Guide
Screenshots and photos will help you to
better understand the actions you have
to perform.
Yellow boxes show reactions from the softor hardware
Blue boxes provide additional information
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Mechanical Setup
TEC Controller Setup Guide
The TEC controller is configured by the
service software on the PC.
The temperature sensor and the Peltier
Element are connected to the TEC
controller. The Peltier element has to be
placed on the heat sink with the cold side
(marked side) upward.
The connections are described later, step by
step.
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1. Connect TEC with PC
TEC Controller Setup Guide
We will prepare the computer to be able to configure the TEC using the service software.
•
Connect TEC on X4 to your PC using a mini USB-B cable
•
Windows will prompt you to install a USB (serial interface) driver
•
Follow the steps for the installation as shown by Windows
If Windows can not recognize a new device you can install the driver from our software CD
(CD: Installation\FTDI Driver\CDM v2.10.00 WHQL Certified.exe)
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2. Install Service Software
TEC Controller Setup Guide
We need to install the service software from the software CD.
There are requirements for the service software:
•
Microsoft .net Framework 4.0 (CD: Installation\dotNetFx40_Full_x86_x64.exe)
•
Microsoft Visual C++ 2010 Redistributable Package (x86)
(CD: Installation\vcredist_x86.exe)
•
Copy TEC service software to a folder on your PC. (CD: TEC_G01\Software\TEC Service
v2.XX.exe)
•
Execute TEC service software
•
Get familiar with the 8 tabs of the TEC service software and their names on top
•
TEC service software displays: «No compatible
device free» because the TEC controller is not
yet powered
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3. Power TEC Controller
•
Set the power supply to 24 V
•
Connect TEC to the power supply at X1
(Vin) and X2 (GND)
•
Switch on the power supply
•
Green LED starts flashing continuously on
the TEC Controller
•
Service Software displays «Connected» and
connect status indicator is green
•
«Device Status» is amber and ready
TEC Controller Setup Guide
Information about your TEC Controller is
displayed on the top right corner of the first
tab.
If an error occurs, the description is displayed
in the monitoring tab.
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4. Temperature Measurement
TEC Controller Setup Guide
Tab 5 Object Temperature
In general you can set values by typing them to
the corresponding field and click on «Write
Config» to save them to the controller.
•
Set «Lower Error Threshold» to 10 °C
•
Connect your temperature sensor to the
connector X7 on the TEC Controller
•
Make sure temperature probes on cable
and plug are assembled according to the
following schematic showing X7. (Marked
red)
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5. Temperature Measurement
TEC Controller Setup Guide
Tab 5 Object Temperature
We use a 10K NTC sensor with a B value of
3988K. The values for the sensor already
correspond to the default settings. If you use
another NTC sensor, you will have to set the
values given by the datasheet of the sensor.
For Pt100/1000 sensors the TEC will use
internally stored settings.
•
Set «CH1 Object NTC Sensor
Characteristics» if needed
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6. Check Functionality
TEC Controller Setup Guide
Now the TEC controller is able to measure the
temperature of the object.
Tab 1 Monitor
•
Check if «Object Temperature» shows
realistic values
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7. Peltier Element
TEC Controller Setup Guide
First we have to tell the TEC controller the
characteristics of the Peltier element we are
using.
Tab 4 Temperature Control
•
Search the four parameters in the
datasheet of your Peltier element: Imax,
Umax, Qmax, dTmax
•
«CH1 Peltier Characteristics»: Put the four
parameters into the corresponding fields
•
Choose the option «Cooling» in «Positive
Current is»
Important: «CH1 Peltier Characteristics» are
values given by the datasheet of the Peltier
element. These values can not be used to limit
the output. Limits are set in Tab 3 Operation.
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8. Static Current Operation
TEC Controller Setup Guide
First we will operate the TEC controller in a
static current mode to check the functionality
in combination with the Peltier element. So the
Peltier element is supplied by a constant
current, temperature independent.
Tab 3 Operation
•
«General Operating Mode» is by default set
to «Single (Independent)»
•
«CH1 Output Stage Control Input
Selection» is by default set to «Static
Current/Voltage»
•
Set «CH1 Output Stage Control Values» for
static operation:
Set «Current [A]» to approx. 10% of Imax of
the Peltier element. In our case we will
use 1 A.
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9. Connecting the Peltier Element
TEC Controller Setup Guide
Connect the Peltier element to X5 (OUT+) and X6 (OUT-). Connect the red cable to OUT+ and
the black cable to OUT-. The cold side of the Peltier element will be the one with the
identification marking.
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9. Connecting the Peltier Element
TEC Controller Setup Guide
Since we have everything connected and
prepared, our setup now looks like this.
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10. Check Functionality
•
Tab 3 Operation: Set «CH1 Output Stage
Enable» to «Static ON»
•
«Device Status»: Run
•
Tab 1 Monitoring: «Actual Output Current»
shows 1 A
•
Tab 2 Chart: Object temperature should
sink. If not, the polarity of the Peltier
element is wrong. Check your wiring.
•
Switch off output by setting «CH1 Output
Stage Enable» to «Static OFF»
Meerstetter Engineering GmbH, Schulhausgasse 12,
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http://www.meerstetter.ch
TEC Controller Setup Guide
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11. Temperature Controller
TEC Controller Setup Guide
The TEC controller is working correctly. Now
our goal is to keep an object at a constant
temperature. First we set the control
parameters. Then we have to limit the output
of the TEC controller.
Tab 4 Temperature Control
•
Set «Target Object Temperature» at «CH1
Nominal Temperature» to 15
In «CH1 Modelization for Thermal Power
Regulation» the option «Peltier, Full Control» is
chosen. This means that the controller can
heat and cool the object using the Peltier
element.
Meerstetter Engineering GmbH, Schulhausgasse 12,
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12. Operation Limits
TEC Controller Setup Guide
Now we need to set the output limits for the
operation of the Peltier element.
Tab 3 Operation
Limits are set depending on the application.
However, usually the voltage limitation should
be set approx. 1 V over Umax of the Peltier
element.
•
Set CH1 Limits & Error Thresholds:
«Current Limitation [A]»: 4
«Voltage Limitation [V]»: 9.6
«Current Error Threshold [A]»: 4.8
«Voltage Error Threshold [V]»: 12
Error Thresholds should be set approx. 20%
over the corresponding limits.
•
Set «CH1 Output Stage Control Input
Selection» to «Temperature Controller»
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13. TEC Controlling Temperature
TEC Controller Setup Guide
Now we can check if the TEC controller reaches
the desired temperature and monitor the
stability of the set temperature.
Tab 3 Operation
•
Set «CH1 Output Stage Enable» to «Static
ON»
Tab 2 Chart
•
The temperature will converge to 15°C
•
In the status bar at the bottom the «Object
Temperature» is amber if it has not yet
reached the target temperature
•
If the «Object Temperature» equals the
target temperature the indicator is green
•
There can be a small difference between
the desired target temperature and the
measured object temperature
•
Set «CH1 Output Stage Enable» to «Live
OFF/ON» in Tab 3 Operation
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14. Auto Tuning
TEC Controller Setup Guide
To be able to precisely control the object
temperature we have to optimize the control
system of the TEC controller. This can be done
using the integrated PID Auto Tuning function.
Tab 7 Auto Tuning
•
Click on the «Start» button
•
The system tries to optimize the system and
seeks optimum PID values
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14. Auto Tuning
TEC Controller Setup Guide
Tab 2 Chart
•
In the chart you can see how
the system is ramping to the
target temperature
Tab 7 Auto Tuning
•
If the tuning is successful, the
found values can be saved by
clicking on «Write Auto Tuning
Results to TEC»
•
If it was not successful, try the
option «Slow Model» in
«Thermal Model Speed»
The system will use the found PID
parameters from now on to control
the system if the tuning was
successful.
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16. Check the tuned System
TEC Controller Setup Guide
Now we can check if the object temperature is
closer to the desired temperature.
Tab 3 Operation
•
Switch the output on by setting «CH1
Output Stage Enable» to «Static ON»
Tab 2 Chart
•
After some time the controller holds the
temperature at the target temperature with
a high stability
Tab 3 Operation
•
Switch off the output by setting «CH1
Output Stage Enable» to «Static OFF»
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17. Next Steps
TEC Controller Setup Guide
Congratulations! Your TEC controller is working and you should be able to set up a simple
application with your TEC controller.
•
If you need more information about how to design a thermoelectric application including
calculations and choosing Peltier elements, please refer to our «TEC / Peltier Element
Design Guide» on our website:
http://meerstetter.ch/compendium/tec-peltier-element-design-guide
•
If you need further or more detailed information about operating our TEC controllers,
please refer to the TEC Family User Manual:
http://meerstetter.ch/de/category/33-latest-user-manuals?download=4
•
For a general overview of our TEC controllers please visit our products page:
http://meerstetter.ch/products/tec-controllers
Meerstetter Engineering GmbH, Schulhausgasse 12,
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http://www.meerstetter.ch
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