Оценок - 4, средний балл: 4.3
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Фрагмент инструкции
Each time the step motor driver receives a pulse, the step motor moves one step. If the driver receives 200 pulses, the motor moves 200 steps. The motor steps at the same frequency as the clock pulses. FIGURE 1: Step Motor Driver General Description The BLD72 is a step motor driver that can drive motors rated from 1 to 7 amps/phase (unipolar rating). It can handle 6 lead and 8 lead motors. This driver features a unipolar bilevel (or dual voltage) drive technique with short and open circuit protection (with a Fault LED). A transformer is required to power up the driver. Bilevel Drive The basic function of a motor driver is to provide the rated motor phase current to the motor windings in the shortest possible time. The bilevel driver uses a high voltage to get a rapid rate of current rise in the motor windings in the least amount of time. When reaching the preset trip current, the driver turns off the high voltage and sustains the current from the low voltage supply. Half-Step/Full-Step Users have a choice of full-step operation or half-step operation. Full-step operation occurs by energizing two phases at a time, rotating a typical motor 1.8 degrees per step. Half-step operation occurs by alternately energizing one, and then two, phases at a time, rotating the motor 0.9 degrees per step. Full-step operation is suggested for applications that specifically require that mode, such as when retrofitting existing full-step systems. 2 Clock Modes The BLD72 has two clock options: Clock and Direction, or Dual Clock operation. Jumper JP2 is used to select the clock option. Basically JP2 selects Terminal 5 as either the Direction input or the CCW input. With the Clock and Direction option (most common option), clock pulses applied to the Clock input (Terminal 6) cause the motor to step. The direction of the motor is determined by the logic level of the Direction input (Terminal 5). Jumper JP2 must be in the “2-3” position for this mode (see Figure 4 and Table 1). Physical direction also depends on the motor wiring. With the Dual Clock option, clock pulses applied to the Clock input (Terminal 6) cause the motor to step in the clockwise direction. Clock pulses applied to the CCW input (Terminal 5) cause the motor to step in the counterclockwise direction. Jumper JP2 must be in the “1-2” position for this mode. Either positive or negative going pulses may be used by setting jumpers in the appropriate position (see Table 1). To determine which setting to use, first consider the type of clock pulse output on the pulse generator or indexer (controller). If the clock output on the controller is open-collector type (sinking), then use the negative going jumper setting. If the clock output on the controller is a pnp or p-channel (sourcing) type, then use the positive going jumper setting. If the clock output on the controller is a TTL/CMOS type (totem pole), then either setting will work; but the jumper setting should be chosen based on the level of the clock output when the controller is not pulsing. If the clock is low when not pulsing, then use positive going jumper settings. If the clock is high when not pulsing, then use the negative going jumper setting. The clock inputs (Clock and CCW) are pulled up to +5Vdc through a 10K ohm resistor for negative going clock inputs; or pulled down to 0VDC through a 10K ohm resistor for positive going clock inputs. The pullups/pulldowns are followed by an RC filter. See Figure 2 and Figure 3. Figure 2: Sourcing Clock Input Figure 3: Sinking Clock Input Motor On/Off Input The motor on/off input allows de-energizing a motor without disturbing the positioning logic. After reenergizing the motor, a routine can continue. This reduces motor heating and conserves power, especially in applications where motors are stopped for long periods and no holding torque is required. If holding torque is required (such as when lifting a load vertically), then the motor must stay energized. 3 Jumper Functions/Locations noitcnuF1PJ2PJ3PJskcolCgnioGevitageN2-1X X skcolCgnioGevitisoP3-2X X WCC=5lanimreTX 2-1X noitceriD=5lanimreTX 3-2X delbanEnoitceteDtluaFdnuorGX X 3-2delbasiDnoitceteDtluaFdnuorGX X 2-1tcudorPdradnatS2-13-23-2 Table1: Jumper Settings Figure 4: Layout Drawing Adjusting Kick Current By following the instructions on the cover, use a small screwdriver to adjust the potentiometer. Line up the potentiometer’s arrow to the number corresponding to the motors rated current (amps/phase). 44 3 5 2 53 6 62 1 7 1 7 Example 1: 23D104 Motor, Set to 2.0A. Example 2: 34D314 Motor, Set to 7.0A. Fault Protection There are 3 types of fault detection. When a fault is detected, the driver turns off the motor current and the red Fault LED indicates which type of fault occurred. See the Troubleshooting section for more information. 1 LED -Slow Blink Shorted wire in the motor or cable. 2 LED -Fast Blink Open wire in the motor or cable. 3 LED -ON Steady Ground fault (voltage shorted to 0V). Table 2: LED Blink Definiti...
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