Signal Consulting, LLC 

Model Si15NePITC2-HC12B-30V-20A 

  Networkable, Proportional and Integral (PI), Temperature Controller using 2 Loads (Load1 for Heating and Load2 for Cooling), with 12-Bit Digital Temperature Sensor, Two RS232 Ports, Integrated Heat-Sink





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 Si15NePITC2-HC12B-30V-20A Features:

Networkable 9600-Baud RS232 Input/Output Control Port: For Set-Temperature and control parameter Input; and for Measured Temperature and Control parameter Output . All control parameters are stored in nonvolatile memory. Up to 61 Networkable Boards can be interconnected to form a 3-wire Local Area Network, LAN.

PI Temperature Control: 12-Bit Proportional and Integral (PI) Temperature Controller in the -500C to +1200C Range with 0.0650C  steps using 2 Loads. Heat on Load 1 and Cool on Load 2. The Set-Temperature is selected with a network command.

One Digital Temperature Sensor: A Digital Temperature Sensor with 0.06250C Resolution and 1/20C Accuracy  in the -100C to +800C  Range, and approx.  10C Accuracy in the -550C to +1250C  Range.

Temperature Sampling Rate:  The temperature is sampled at approximately 1Hz rate and the control-loop/display is updated with this same rate.

An Optional LCD Port: For Set and Measured Temperature Display.

Alarm Kill Switch: A normally open switch (or an Open Collector npn Transistor) can be connected to jumper J1 (as shown below), J1 Open=Normal operation, J1 Short=Load (TE Cell) is open.

PWM Load Control: Two 60A MOSFETs are used to PI control the power to two loads (Load1 for Heating and Load2 for Cooling, to two Valves , TE cells, etc) using 750 Hz Pulse-Width Modulation.

High Power-Efficiency: 98.5% typical, at 30V and 20A

Voltage Requirement: A single DC Source Voltage (unregulated ) with any voltage value from 9V to 30V DC (for Vp) at 20A max.

Max Operating Temperature: +450C With the Integrated Finned Heat Sink, as shown.
Load Power: 600W at 30V, 20A.
Overall Dimensions: L=2.4", W=2.3",H=2.1" (61 x 58 x 52mm).
Components Type: 100% Solid State, NO Relays

On Board: Filter Capacitors, Voltage Transient Suppression (VTS) diodes, One Load-Current  Indicator LED (Red=Hot/Cold).

    Download the  Si15NePITC2-HC12B-30V-2x16A-2B2  Manual


The Si15NePITC2-HC12B-30V-2x16A is a 30V, 2x16A, Networkable, Proportional and Integral (PI) Temperature Controller using 2 Loads (Heat and Cool at the same time). The fundamental components of this controller are: a 12-Bit digital temperature sensor; two high-power transistors (FETs); and a networkable microprocessor that stores the selected  control parameters in a nonvolatile memory  and controls the power flow to two loads (Valves, Thermo-Electric (TE) cells, etc) using 750Hz Pulse-Width Modulation (PWM). The temperature is measured with a 12-bit digital sensor and the process is PI controlled with 0.06250C steps in the -500C to +1200C range. By PI control, we mean that the amount of correction used in the control-loop is proportional to the difference and the Integral of the difference between the set and measured temperature values. A single DC power supply (in the 9V to 30V and 0A to 20A range) is required to operate this controller. Two proportional-band parameters are used “c”= 001,...199 for Cold band, and “h”= 001,...199 for Heat band. One step change in the band parameter represents a 1 degree C change. Two control bands are used because the TE cells are more efficient in heating mode than in the cooling mode. These proportional control bands are centered at the set-temperature value; and a smaller band value represent more aggressive proportional control. Full heating or cooling TE-cell power (100% PWM) is used when the measured temperature is outside of this selected band; and reduced TE-cell power (100% to 0% PWM as specified by the PI control) is used inside this band. The integral gain “i”= 001,...199 controls the contribution of the integrator to the total PI control sum. Larger integral gain values represent higher integral contribution (“i”=199 represents 100% contribution). The integrator is reset to zero each time a new set temperature is selected and its growth is limited to prevent excessive integral contribution ( “integral windup”). A wide range of thermal loads can be efficiently controlled with proper control parameter selection. The temperature overshoots and oscillations (“hunting”) are limited to approximately + or - 0. 50C. Control parameter selection and PI tuning are defined in the network section of the Manual. The temperature is sampled at approximately 1Hz rate and the control-loop/display is updated with the same rate.

A Typical Application of the Si15NePITC2-HC12B-30V-2x16A

In this 12-bit, closed-loop, PI temperature control application, the Set-Temperature is adjusted  by command strings derived from a Personal Computer (PC) using the Microsoft “Hyper Terminal” program (or any-other ASCII controller operating at 9600 Baud, 1 start-bit, 8 data-bits, 1 stop-bit, No parity-bit). In this application, one Peltier type Thermo-Electric (TE) cell is used (for heating-only in the heat mode and for cooling-only in the cooling mode, as selected by the ‘m’ command). The TE cells can be purchased from: The temperature of the enclosed and insolated Hot/Cold Environment is measured with the Dallas Semi. DS18B20 (in TO-92 casing) Digital Thermometer, Si24DTsens-Spec1-DS18B20.This sensor can be purchased from Signal Consulting, LLC as Si24DTsens-12B (DS18B20 with 12” leads and 3-pin connector). The optional LCD module can be ordered from Signal using the part number of Si14LCD2L16CH-4PC  (2x16 serial LCD with back-light, 12” cable and with 4-pin connectors).  Warning:  The connecting wires to the Load and the Power Supply must be heavy gauge copper wire (#12 AWG or heavier) to handle the rated current level. In addition, these heavy gauge wires act as a heat sink, preventing overheating.

Command Format and Local Area Network (LAN) for the Si15NePITC2-HC12B-30V-2x16A

Each board has a unique, 8-bit, ASCII, none-volatile, Node-Address ranging from 1….9, A..Z, a,…z; (or a total of 61 Units can be networked). The address can be changed by a LAN command (the factory default address is 1). The board uses a modified version of the RS232 serial-data communication standard, where the output-voltage (on pin I2, CN5) ranges from 0 to +5V (rather than the usual -12V to +12V). In addition, this output pin is normally an open circuit; and it will only output a serial TTL binary bit-stream when properly referenced by its Node-Address. The serial data input-voltage (on pin I1, CN5) has the standard range of -12V to +12V. The serial data-format is: 9600 Baud Rate, 1 Start-Bit, 8 Data-Bits, 1 Stop-Bit, and no Parity-Bit. These features allow the creation of a Local Area Network (LAN) with up to 61 nodes (boards). A typical 3-wire LAN with “Star Topology” is shown below. Note that the control lines (G, I1, I2) with the same name are connected together (or the boards are connected in parallel) and driven by an ASCII controller (or PC), equipped with an RS232 serial port, operating at 9600 Baud rate.

Network Configuration: The on-board microprocessor provides the bus arbitration, required to avoid data collisions on the 3-wire LAN bus. The  Si..Ne.. boards can be arranged in many Local Area Network (LAN)  topologies: Star, Daisy-Chain, etc. You may create your own network or you may order one or more of the Network Cable Assemblies  listed below. Before you build your network, click on this blue link and read this Application NoteSig-Note on Configuring a LAN-2 .

Click  on the "Buy this Product" Button  or the Blue Links Below to Buy the Optional Accessories

Si15NePITC2-HC12B-30V-2x16A,  Dual 12-Bit Networkable,  Proportional and Integral, Temperature Controller, 2 Loads, 30V, 20A.
Price $159.00

Note: If Buying the Si15NePITC2-HC12B-30V-2x16A, it is recommended to buy one Si24DTsens-12B Digital Thermometer and one or more Network Accessories .

Si24DTsens-12B , 12-bit Digital Thermometer ( -550C to +1250C Range, in 0.0650C Steps) with 12" leads and 3pin Molex Connector. 
Price $39.00
Optional Si14LCD2L16CH-4PC  2 Line by 16 Character LCD with 12" long cable and 4-pin connectors.  
Price $59.00
Si25-DB9cable1 , 1m long Network Cable Assembly with 9-pin female DB9  connector.
Price $19.00
Si25-PJtoHcable-1m , 1m long cable assembly with Phone Jack and Header connector.
Price $19.00
Si25-LANhub5  , 1m long Network Cable Assembly 9-pin female DB9  connector and a “Junction-Box” with 5 Phone Jacks.
Price $39.00
Si25-LANext5  , 1m long Network Cable Assembly with 6P4c Phone Plug  connector and a “Junction-Box” with 5 Phone Jacks.
Price $29.00

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