Signal Consulting, LLC  Model Si24DiBdMC1-50V-20A-AP1

50V 20A, Open-Loop, Digital Bidirectional Motor Controller with Active-Low Soft-Start and Soft-Stop Control, AP1 Aluminum Plate as Heat Sink, LCD Port and with 5kHz or 20kHz PWM, Y-Chip

Si24DiBdMC1-50V-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 a Jumper on Port J1. LCD Port: For Set and Measured RPM Display Adjustable Load Voltage (RPM): The average Load-Voltage (or motor RPM) is adjustable from 0V to 50V  (or max. value of Vp) in 0.83% steps with external Up/Down RPM Push-Buttons. High Power-Efficiency: 98.5% typical, at 50V and 20A Optically Isolated Directional Control Signals   With AP1 Aluminum Plate as  Heat Sink Power Semiconductors: Four 90A Hex-MOSFETs Overall Size: 4.0" x 3.3" x 2.1" (102 x 84 x 39mm). 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 50V (for Vp) Si24DiBdMC1-50V-20A-AP1-5Y  Spec Sheet  (PDF)

 The Si24DiBdMC1-50V-20A-AP1 is a 50V 20A, microprocessor based, high-power, Digital, Bidirectional, Motor Controller that uses a single DC power supply to control the speed of a DC motor in forward or reverse direction at a voltage-range of 9V to 50V and with a current-range of 0 to 20A. 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. 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. 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 0.5s, 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 digital (Di) implies, the required motor speed (or PWM pulse-duration) is adjusted in 0.83% steps with Up/Down RPM push-buttons (connected to port CN6) while the motor direction is selected using two active low digital (0 to 5V) control signals (V_F,G  and V_R,G) or switches.  A bicolor LED is used to monitor the motor (or load) voltage (Red = Forward, Green = Reverse). An LCD port (with HITACHI HD44780 Interface Standard and with back-light) is provided for optional display of motor RPM data in a 2 line by 20 character format. A small (3.3”x4.0”x0.065”) AP1 Aluminum plate,  is required 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 50V) with max. continuous current of 20A. Typical applications are: Bi-directional DC Motor-Speed Controller, Peltier Effect TE Coolers, Heat Pumps, DPDT Solid State Relay, etc.

Motor Control-Action Truth Table, (Pins on Connector CN4)

 The motor action or load-current direction is controlled by the voltage (0 to +5V) applied to Pin F (Forward) and/or pin R (Reverse) relative to Pin G (Ground) on the CN4 connector; as shown in the Truth-Table given above. Similarly, the Up and Down RPM inputs on CN6 connector use active low control, requiring a momentary low to increment or decrement the Set-RPM  values. The time duration for a one-step momentary low is 7ms + or – 2ms when J1 is open (fast mode), and 70ms + or -20ms when J1 is short circuited (slow mode). The Set-RPM register is cleared at power turn on, always starts with zero % PWM value and can be incremented to 100% with 0.83% steps. All control lines are sampled approximately at 80Hz rate in the fast mode, and at 8Hz rate in the slow mode.    

A Typical Application of the Si24DiBdMC1-50V-20A-AP1

 In this open-loop application, the PWM or motor speed (in forward or reverse direction) is adjusted in 0.83% steps using two external Up/Down RPM push-buttons (Signal Part number Si24PB2-MC3  connected to port CN6) and the motor direction is controlled by 4 external switches connected to port CN4 (as shown below). The normally-open switches select the motor direction, while the optional normally-closed limit-switches are included to prevent over-rotation in window-lifting applications. The LCD module can be ordered from Signal with the part number of Si24LCD2L20CH  (2x20 display with 8” ribbon cable and 14-pin connector, and with back-light). Warning:  The connecting wires to the Load and the Power Supply must be heavy gage copper wire (#12 AWG or heavier) to handle the rated current level. In addition, these heavy gage wires act as a heat sink, protecting the board from overheating.

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