Signal Consulting, LLC 

Model Si24BaBdMC1-30V-20A-AP1

Open-Loop, 30V 20A, Biased Analog Input, Bidirectional Motor Controller with Soft-Start/Stop, AP1 Aluminum Plate Heat Sink, LCD Port and with 5kHz or 20kHz PWM, Y-Chip





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Si24BaBdMC1-30V-20A-AP1 Features:

Efficient H-Bridge for Bidirectional Current Control
Control Input: Active Low, with Soft-Start and Soft-Stop Motor Control
Max. Current for 5 sec : 40A with AP1 as Heat-Sink
Max. Continuous Current: 20A with AP1 as Heat-Sink

Typical Operating Temperature at 20A: 550C with the Metal Heat-Rings Bolted to the AP1  Heat-Sink, while it is exposed to air at 250C (as shown on photograph).

Two User Selectable PWM Frequency: 5KHz or 20kHz

Two User Selectable Motor Acceleration/Deceleration Modes:  Using Jumper J3.

LCD Port:  5V RS232 Serial Interface Standard, 9600 Baud, 1 Start, 8 Data, No Parity, 1 Stop.

Adjustable Load Voltage (RPM): The average Load-Voltage (or motor RPM) is adjustable from 0V to 30V  (or max. value of Vp) in 0.83% steps.

High Power-Efficiency: 98.5% typical, at 30V and 20A
Optically Isolated Directional Control Signals 

With AP1 Aluminum Plate as  Heat Sink
Power Semiconductors: Four 90A Hex-MOSFETs
Overall Dimensions: 4.0" x 3.3" x 1.4" (102 x 84 x 34mm).
Components Type: 100% Solid State, NO Relays

On Board:
Filter Capacitors
VTS diodes
Snubber Circuit Ready
  Bicolor LED Indicator,  (red=forward,  green= reverse)

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

 For Details, Download the  Si24BaBdMC1-30V-20A-AP1-SD4-5Y1    Manual


The Si24BaBdMC1-30V-20A-AP1 is a 30V 20A, microprocessor based, high-power, Biased Analog Input, Bidirectional, Motor Controller with user selectable Soft-Start and Soft-Start features. This controller uses a single (9V to 30V at 0 to 20A) DC power supply to control the speed of a DC motor in forward or reverse 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 Liquid Crystal Display (LCD) and monitors the user inputs. Three active low, user selectable Jumper pins (J1, J2, J3) are provided; controlling the motor action. 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 1.25Sec, is selected by shorting pins J3  (jumper installed); while the fast buildup mode, with rise-time/fall-time of 0.05s, is selected by leaving these pins open. The PWM carrier frequency is user selectable by the jumper J2, 20kHz when J2 is open and 5kHz when short. This high frequency PWM rate insures a quiet motor environment. An active low “Kill-Switch” input (J1) is used to stop the motor rotation under emergency conditions: J1 open=Run, J1 short=Stop. As the name Biased Analog Input (Ba) implies the required motor speed (or PWM pulse-duration) and rotational direction is determined by an analog Input voltage (on pin I1) raging from +2.656V to +5V for forward direction and +2.344 to 0V for reverse direction and  a small “dead-band” at 2.5V (as shown below). All inputs are optically isolated or zener-diode protected. A bicolor LED is used to monitor the motor (or load) voltage (Red = Forward, Green = Reverse). An LCD port (with 5V RS232 Serial Interface Standard and with back-light) is provided for optional display of motor PWM data with a 2 line by 16 character format. A small (4.0”x3.3”x0.062”) AP1 Aluminum Plate heat-sink is used to operate at 20A current levels. Higher current-levels (25A or 750W) 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: Bi-directional DC Motor-Speed Controller, Peltier Effect TE Coolers, Heat Pumps, DPDT Solid State Relay, etc. This board can be configured and programmed to perform efficiently in many customized applications.


 All control lines (analog and digital) are sampled approximately at 80Hz rate in the fast mode (J3 jumper open), and at 8Hz rate in the slow mode (J3 jumper short).

A Typical Application of the Si24BaBdMC1-30V-20A-AP1

 In this open-loop application, the PWM or motor speed and direction (in forward or reverse direction) is adjusted by an external linear 1-turn 5kW potentiometer (connected to port CN6, Signal Part number Si5Pot1-5k) The LCD module can be ordered from Signal with the part number of Si14LCD2L16CH-4PC  (2-Line by 16-Charecter Serial LCD with 12” cable and 4-pin connector, and with back-light). 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, protecting the board from overheating.

 Si24BaBdMC1-30V-20A-AP1  Biased Analog Input,  Bidirectional Motor Controller Board with AP1 Aluminum Plate
Price $219.00

Note: If Buying the Si24BaBdMC1-30V-20A-AP1, it is recommended to buy one  Si14LCD2L14CH-4PC Display, and one Si5Pot1-5k  potentiometer

Si14LCD2L16CH-4PC  2 Line by 16 Character LCD with 12" long cable and 4-pin connector.  
Price $59.00
Si5Pot1-5k  potentiometer with 12" leads.  
Price $15.00

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



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