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GS-D500A 데이터시트(PDF) 7 Page - STMicroelectronics |
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GS-D500A 데이터시트(HTML) 7 Page - STMicroelectronics |
7 / 10 page 7/10 A1 - SUPPLY VOLTAGE THE POWER SUPPLY MUST BE TURNED OFF WHEN PLUGGING OR UNPLUGGING THE BOARD The supply pins are: J2-1 for Motor Supply Voltage J2-3 for Auxiliary Voltage J2-2,4 for Ground rail The other supply voltages needed by the boards are internally generated. If an undervoltage condition is detected (Vs < 10V) the GS-D500A is automatically disabled and a led is activated. The Motor Supply voltage is in the range from 12 to 100V, the Auxiliary voltage from 11 to 13V. At power-on the Auxiliary Supply voltage must be applied before the Motor Supply voltage, while at power-off the Motor Supply voltage must be removed before the Auxiliary voltage. A2 - FULL-STEP/HALF-STEP/MICROSTEP PRO- GRAMMING BY HARDWARE The number of microsteps per step is field program- mable. The digitized sine and cosine functions, required by a microstepping control, are stored in a Lock-Up-Table inside the GS-D500A. Two options are provided for the proper mi- crosteps/step rate selection. Three switches (SW1, SW2, SW3) are available on the front edge of the board. The full-step/half-step/microstep mode is defined by the following table. SW1 SW2 SW3 MODE OFF ON OFF Half step ON ON OFF 125 microsteps/step ON OFF ON 25 microsteps/step OFF ON ON 5 microsteps/step ON ON ON Full step The switches are in OFF condition when the knob is pulled versus the board edge. Invalid combina- tions disable the board. A2.1 - MICROSTEP PROGRAMMING BY HOST COMPUTER The microsteps/step rate can also be remotely changed by using the three logic inputs available on the J3 connecto r (pins 4,12 and 15) that cor- responds, respectively, to SW1, SW2, SW3. The interactionbetween logic signals and hardware switches is shown in fig. 4. Figure 7. Remote microstepping programming To operate the logic pins of the J3 connector, the three internal switches must be in the OFF state. A3 - CURRENT REDUCTION AT REST Phase current can be reduced when the motor is stopped if SW6 is open. Current reduction is operative about 1 second after the last clock pulse. GS-D500A |
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