Peltier-Controller TC2812 Operation Manual Version 1.15, 30.01.
Contents 1. Overview 1 1.1 1.2 1.3 Application Zur Dokumentation Supply content 1 1 1 2. Connections and Key functions 1 2.1 2.2 2.3 2.3.1 2.3.2 2.3.3 2.3.4 Overview Display and Keys In- and Outputs Overview Sensor Input Auxiliary Output Auxiliary Input 1 1 2 2 2 4 5 2.3.5 2.3.6 2.3.7 Power Output Power Supply Serial Interface according to RS232C 6 6 6 3. Operation description 7 3.1 3.2 3.3 3.4 3.5 3.6 3.6.
1. Overview 1.1 Application The Peltier-Controller TC2812 is a temperature indicator with controlling function and PWM output for driving Peltiers. It has a housing for panel mount to DIN 43700 and is especially built for low voltage operation. The Peltier-Controller TC2812 combines temperature indicator and -controller with a PWM output for directly driving Peltiers. All integrated in a compact housing for panel mount according to DIN 43700.
Function of the 3 LEDs: LED “Heating” LED “Cooling” LED “Mode-Display” Controller heats Controller cools Programming mode and other special displays The 4 Keys have the following functions: Key Key Key Key “Mode-Switch” “increase value” “Digit selection” “Enter” changes the operation mode increases the value of the selected digit changes the activated digit stores the value or the item changed The function details are described under the chapter „Firmware“. 2.3 In- and Outputs 2.3.
Sensors Pt100 Resistance measuring pt1000 Resistance measuring Special Resistance range approx. 70 .. 167 Ohms (according to - 75.0 ... 175.0 °C), current approx.. 2.0 mA range ca. 700 .. 1670 Ohms (according to - 75.0 ... 175.0 °C), current approx. 0.2 mA range and measuring current according to customized configuration Wiring of a 3-wire sensor The measuring principle is standard 3-wire technique, that is the wire resistance and its changes within reasonable limits does not affect the measuring.
2.3.3 Auxiliary Output The instrument has a digital output which serves the signalization of the process status. According to the configuration the output becomes active at: - “OK”-function, the target temperature is balanced, that is within the selceted temperature tolerance range - “Alarm“-function, the temperature strongly deviates, that is outside of the selected temperature Alarm range Applicable voltage Output current Overload protection Type Minimum Voltage max. 30V max.
The input works independently of the polarity. An operation with alternating current is not possible, since the power output would be modulated. Following diagram shows the driving by a NPN-output of a SPS. When the NPN output is on (= LOW) the auxiliary input will be activated. Wiring of a SPS to the auxiliary Input 2.3.4 Auxiliary Input The instrument has a digital input, which According to the configuration is: - the power output can be optionally switched on or switched off.
2.3.5 Power Output The power output provides a PWM signal to feed the Peltier modules. The polarity will be automatically switched, it is possible to heat and to cool. Output voltage Output current PWM frequency Overload protection Connecting cable depending on the supply voltage, typically value of supply voltage minus 0.5 … 1.0 V 12 A max. around 2 kHz Over current limitation recommended cross section 0.75 …2.
3. Operation description 3.1 Overview The equipment has two basic modes, the operation- and the configuration mode. After the controller is switched on it is in the operation mode. Short pressing the „Mode Switch“ button indicates the actual set value. Long pressing the „Mode Switch“ button switches the controller into the configuration mode 3.2 Power on When the controller is switched-on the display indicates the test display (all segments and decimal points are illuminated).
Step 2 – Selection of the alterable value There are the following options: Press button „Input“ to change the signalized value of the flashing digit Press button “increase value” to select a different value Press button “Mode Switch” to exit immediately the configuration mode - (The button „digit selection“ is ineffective in this state) Step 3 – adjust value You have selected the value with the button „increase value” and the button “ Input/Enter” The display jumps to the state of the presently programmed
3.6 Display of configuration values detailed 3.6.1 Set Value The adjustable range is -99.0 … 199.9, whereas the nominal range is -50.0 … 150.0. Hence the highest digit changes only 0 .. 1. 3.6.2 3.6.3 3.6.4 Tolerance and Alarme Range - the range is 0.0 .. 9.
3.6.
After pressing the button “input” the actual programmed value of the temperature ramp is displayed. In the example it is 6.0° per minute. This means, that the internal set point value will be achieved by a ramp of 6.0°C per minute A selected value of 0.0 put the ramp function out of duty, that is the nominal set point temperature will be achieved without delay. The „nominal set point value“ is the value, which appears after short pressing the mode button.
Error Number Meaning Error cause – and removal E003 over-current error of the output Short circuit at the output, Peltier module defect > check wiring / correction > check Peltier module / replace > eventually contact factory E004 Controller overheated Inside temperature of the controller too high Ambient temperature too high, Instrument exposed directly to the sun, output overloaded > avoid excessive external warming > eliminate overloading > reduce eventually PWM-Limit E005 Watchdog has responded
3.10.3 Character Set * A..Z a..z _ § . ? # 3.10.4 Interruption from Master (for Synchronisation) Address commands (underline) is separation sign between values End of the message acknowledge “OK” acknowledge “unknown / incomplete command sequence” Internal fault Data Flow Each communication is started by the Master (PC), by sending a „*“ as Synchronisation. Hence the Slave (TC2812) changes to the basic communication state. Now the Master sends address and command (in our example „A_r_0_0“).
A Command Set Read/Write CommandParameter r_ .. _ / w_ ..
Read/Write CommandParameter r_ .. _ / w_ ..
Meaning of the structure column cfgTable internal data strucure, any change will be valid until power off only EEData same values as cfgTable, but will be saved to nonvolatile memory, therefore unchanged after power off / on cycle Attention: Excessive usage of EEDATA commands can lead to wear out of the memory cells used. This can cause the loss of information.
