Signal Consulting, LLC  Model Si15NeUdPC1-30V-20A

Networkable, Unidirectional, 30V 20A, Power Controller with User Selectable Control Inputs, 4-Digit Display Port, and with 5kHz or 20kHz PWM, B-Chip

Si15NeUdPC1-30V-20A Features: Power Semiconductors: Two 60A MOSFET Max. Continuous Current: 20A with Heat Sink (as Shown) Max.  Current for 5 sec: 40A with Heat Sink (as Shown) Overall Dimensions: 61mm x 57mm x 44mm Integrated Finned Heat Sink with 4-40 Standoffs and Screws    Component Type: 100% Solid State,   RoHS Compliant User Selectable Control Inputs:  9600bps Networkable RS232 Control, Analog (0 to+5V or Potentiometer) Control, or Up/Down Keys Control.     RS232 Port for 4-Digit %PWM Display Max. Continuous Current: 20A with Heat Sink (as Shown)   Adjustable Load Voltage: The average Load-Voltage is adjustable from 0V to 30V in 0.83% steps ( or max. value of Vp) with a Pulse-Width Modulation (PWM) control signal or with an internal/external potentiometer.   High Power-Efficiency: 97.5% typical, at 50V and 20A On Board: Filter Capacitors VTS diodes Snubber Circuit Ready Load-Voltage Indicator, LED (red) Voltage Requirement: A single DC Source Voltage (unregulated and Unfiltered) with any voltage value from 9V to 30V (for Vp)    Si15NeUdPC1-30V-20A-1B2   Spec Sheet  (PDF)

The Si15NeUdPC1-30V-20A is a 30V 20A, networkable, microprocessor based, high-power, Unidirectional, Power Controller that uses a single (9V to 30V at 0 to 20A) DC power supply to control the average current  to load (or DC motor) in one direction. An onboard microprocessor generates a 5kHz or 20kHz PWM carrier signal, controls the load-power (or motor speed), controls the load-current rate (or motor acceleration and deceleration), updates the 4-Digit Display, monitors the user inputs and controls the RS232 Network Port. The PWM carrier frequency is user selectable by the jumper J2, 5kHz when J2 is short and 20kHz when open. The jumper J2 is examined only at power turn-on. This high frequency PWM rate insures a quiet motor environment. The user can choose between slow or fast motor acceleration/deceleration modes by short-circuiting or open-circuiting the pins labeled J3.  The slow mode, with rise-time/fall-time of 0.5s, is selected by short-circuit (J3 jumper installed); while the fast buildup mode, with rise-time/fall-time of 0.05s, is selected by opening these pins. All control lines are sampled approximately at 20Hz rate in the fast mode (J3 jumper open), and at 8Hz rate in the slow mode (J3 jumper Short). The Jumper J4 is used to select the I/O Mode. In the Analog Mode (with J4 jumper Short), the %PWM (PWM pulse-duration) of the motor current is variable from 0 to +100% in 0.83% steps by a( 0 to +5V) analog voltage applied to the I1 input pin (relative to pin G on the CN5 Network Port, as show on the diagram below). In the Digital Mode (as the name Ne, Networkable implies), the %PWM (PWM pulse-duration) of the motor current is variable from 0 to +100% in 0.83% steps by using ASCII command strings on the RS232 Network Port; or it can changed by using external UP/DOWN keys connected to N3 and N2. The RS232 data format and the Local Area Network (LAN) commands are described on the next page. A “Kill-Switch” (connected to J1) is used for emergency motor-stop (switch open=Motor Runs, Switch closed=Motor Stop with zero current, as shown on the application drawing below). All control inputs are zener-diode protected. A red LED is used to monitor the motor (or load) voltage. A 9600 Baud serial port (CN4) with 5V RS232 Interface standard is provided for optional display of the %PWM data in a 4-Digit format. A 0.0 display represents 0.0 %PWM and 100.0 display represents 100.0 %PWM. For more information on the 4-Digit LED Display, please click on these links ( Si4Display ,  Si4Display-Spec1 ). A small (2.4”x2.3”x0.5”), integrated Aluminum heat-sink is used to operate at 20A current levels. Higher current-levels (25A or 1200W) can be achieved with more efficient heat-sinks. Please click on this link and read the Board Mounting Instructions and Heat Sink Selection Guide. This board operates in a wide voltage-range (9V to 30V) at max. continuous load-current of 20A.Typical applications are: Unidirectional DC Motor-Speed Controller, Flicker-free LED light intensity control, Proportional Valve-Coil Controller, etc.

This board can be configured and programmed to perform efficiently in many customized applications.

Jumper Selection Table

    A Typical Si15NeUdPC1-30V-20A Application

In Digital Mode (J4 Open), the PWM or motor speed  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 addition, the PWM can be adjusted with Up/Down Keys ( Si15PB2-MC4 ). In the Analog Mode (J4 short) the PWM or motor speed is adjusted by a 0 to +5V analog voltage (V_I1,G) applied to I1 and G on CN5.  Or it can be adjusted by a 5k Ohm Linear taper potentiometer connected to terminals +5, I1, and G on CN5 (Si5Pot1-1k ). An optional serial 4-Digit LED module is used to display the Measured PWM value. The display remains active in both modes. This display can be ordered from Signal as part number of Si4Display  (4-Digit 7-Segment LED with 12” cable and 3-pin connector).

 The DC Motor can be purchased from:  www.bodine-electric.com , or  www.e-motorsonline.com/emotors/dcmproduct_list.php.  

Command Format and Local Area Network (LAN) for the Si15NeUdMC1-30V-20A

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.

  Command Rules:

1.  All Commands are ASCII character strings (Chars.).  An ASCII string is denoted here with Bold Red Letters (Characters).

2.  Each string is terminated by a Carriage Return Character, (CR). The only exception is the # command.

3.  Upper-Case Letters are used for Output Commands; and Lower-Case Letters are used for Input Commands.

4. The 1^st Char. in a string is either ASCII # or a Node Address (1..,9, A,..Z, a,…,z). If the 1^st Char. is an #, it denotes a query to all boards on the LAN to output their Node Address and Program Name.

5. If the 1^st Char.  is a ASCII (1..,9, A,..Z, a,…,z), it directs the rest of the command string to the board that has this address.

6. The 2^nd Char. in the string is the Command Character that operates on the addressed board.

7. The 3^rd, 4^th, 5^th Chars. represents the value of the input data.

8. The last Char. in the sequence is always the string terminator, (CR).

Command Examples:

Ex#1.  Com. String:  #   Action: All boards on the LAN will output their Address and Program Name.

Ex#2.  Com. String:  1u5(CR)      Action: Change Board 1 Address in EPROM from 1 to 5.

Ex#3.  Com. String:  1P(CR)       Action:  Board 1 outputs its Set and Measured Values (0,..120).  

Ex#4. Com. String:   1p120(CR)    Action: Change Board 1 Load Value to 120 = 100% PWM.

Ex#5.  Com. String:  2p60(CR)     Action: Change Board 2 Motor Value to 60 = 50% PWM.

Note1: The p command inputs decimal integer Motor Values, ranging from 0,….+120. The positive values are used for forward speed control. The PWM duty-cycle varies linearly with the input values; 0 value is equal to 0% PWM, while 120 value is equal to 100% PWM.

Note2: The p command is NOT subject to round-off” errors!!!

Note3: The last set value entered with the m command or with the Up/Down keys is saved when the power is turned off, and this value is restored when the power is turned back on.

4-Digit LED Display Format:

 LED display reads    50.0          or         50.0% PWM.

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 Note: Sig-Note on Configuring a LAN-2 .

Availability: We usually ship in 2-3 business days.

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