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Selecting CW/CCW or PUL/DIR Mode There is a jumper J1 (including pin 1 to pin 9) inside the 3P24M specifically for selecting pulse signal mode. Settings for the one-pulse mode (PUL/DIR) and for the double-pulse mode (CW/CCW) are shown in the following figure. Default mode out of factory is PUL/DIR mode and effective at rising edge.
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The 3P24M can accept differential and single-ended control signals (including open-collector, namely common-anode and PNP output, namely common-cathode). The 3P24M has 3 optically isolated logic inputs which are located on connector P1 to accept line driver control signals. These inputs are isolated to minimize or eliminate electrical noises coupled onto the control signals. It’s recommended to use line driver control signals to increase noise immunity of the driver under an interference environment.
8. Power Supply Selection The 3P24M can match medium and small size stepping motors (from NEMA size 17 to 34) made by I.CH Motion or other motor manufactures around the world. To achieve good driving performances, it is important to select supply voltage and output current properly. Generally speaking, supply voltage determines the high speed performance of the motor, while output current determines the output torque of the driven motor (particularly at lower speed).
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Selecting Supply Voltage: The power MOSFETS inside the 3P24M can actually operate within +24 ~ +80VDC, including power input fluctuation and back EMF voltage generated by motor coils during motor shaft deceleration. Higher supply voltage can increase motor torque at higher speeds, thus helpful for avoiding losing steps.
14. Frequently Asked Questions In the event that your 3P24M doesn’t operate properly, the first step is to identify whether the problem is electrical or mechanical in nature. The next step is to isolate the system component that is causing the problem. As part of this process you may have to disconnect the individual components that make up your system and verify that they operate independently.
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