Signal Consulting, LLC 

Model Si30BaBdMC1-50V-30A 

 50V, 30A, Open-Loop, Biased Analog Input, Bidirectional  DC Motor Controller, with Soft-Start/Stop, Integrated Finned Heat-Sink, RS232 LCD Port, 5kHz or 20kHZ PWM, Y-Chip





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Si30BaBdMC1-50V-30A Features:
Power Semiconductors: Eight 90A MOSFETs
Continuous Current: 30A with Heat-Sink (as shown).
Max. Current for 5 sec: 50A with Heat-Sink ( as shown ).
Load Isolation: The Load must be Isolated from the  Power Source.

Two Motor Acceleration/Deceleration Modes: Using Jumper J1
Four User Slectable PWM Carrier Frequencies
: 2.5kHz, 5kHz, 10kHz, 20kHz; Using Jumpers J2 and J3 as shown below.
Motor "Kill-Switch" Control: Active Low (4.7kOhm Pull Up to 5V).
Motor Speed Control : 5k Ohm Analog Pot, 0 to +5V

Load-Voltage Indicator: Bicolor LED.
Worst-Case Control Latency
: 7 micro seconds.
Power-Conversion Efficiency: Approx. 98.5% (at 50V, 30A).
Overall Dimensions : 4.6”x2.43”x2.35”, (117 x 62 x 60 mm).

Onboard 30A Fast Mini-Blade Auto Fuse: Replace, from  DigiKey, Part Number: F6079-ND

Components Type: 100% Solid State, NO Relays

On Board: 
Filter Capacitors
VTS diodes
Snubber Circuit included
Voltage Requirements: A single DC Source (unregulated), any voltage from 12V to 50 Volts

   For Details, Download the  Si30BaBdMC1-50V-30A-2Y2    Manual


 The Si30BaBdMC1-50V-30A is a 50V 30A, microprocessor based, high-power, Biased Analog Input, Bidirectional, Motor Controller with user selectable Soft-Start and Soft-Start features. This controller uses a single (12V to 50V at 0 to 30A) 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. An active low “Kill-Switch” input (on CN4) is used to stop the motor rotation under emergency conditions: CN4 open=Run, CN4 short=Stop. The PWM carrier frequency is user selectable by the jumpers J2 and J3 (as shown on the Table below). 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 J1. The slow mode, with rise-time/fall-time of 1.25Sec, is selected by short-circuit (J1 jumper installed); while the fast buildup mode, with rise-time/fall-time of 0.05s, is selected by leaving these pins open (no Jumper installed). 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 9600 Baud RS232 Standard) is provided for optional display of motor RPM data in a 2 line by 16 character format (on CN3). A small (4.6”x2.5”x1.0”) integrated finned hear-sink is used to operate at 30A current levels. Higher current-levels (40A) 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 (12V to 50V) at maximum continuous load current of 30A. 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 (J1 jumper open), and at 8Hz rate in the slow mode (J1 jumper short).

A Typical Application of the Si30BaBdMC1-50V-30A

 In this open-loop application, the PWM or motor speed (in forward or reverse direction) is adjusted by an external linear 1-turn 5kW potentiometer (Signal Part number Si5Pot1-5k ); while a normally open “kill-switch” connected to port CN4 is used to stop the motor rotation under emergency conditions. The LCD module can be ordered from Signal with the part number of Si14LCD2L16CH  (2 line by 16 character display with 12” cable and 3-pin connector). 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. Note that each connecting point on CN1 is available at 2 places, thus two smaller wires can be used in place of a larger one.

Si30BaBdMC1-50V-30A  , 50V at 30A, Biased analog, Bidirectional DC Motor Controller with Finned Heat-Sink 
Price $279.00

Note: If Buying the Si30BaBdMC1-50V-30A,  it is recommended to buy one Si14LCD2L14CH-3PC Display, and one Si5Pot1-5k Pot

Si14LCD2L14CH-3PC  2 Line by 14 Character LCD, 9600 Baud RS232 Port, 12" long  cable and 3-pin connectors. 
Price $59.00
Si5Pot1-5k   One 1-Turn, 5kW Potentiometer with 12" leads .  
Price $10.00

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



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