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I recently purchased a nema 34 stepper motor and a DQ860MA stepper driver to use in a CNC router. I'm looking at purchasing a power supply, but I'm a little confused about the driver specs. The driver says it accepts an input current of less than 6 amps. I was under the impression that you're able to run an amperage higher or equal to as long as the voltage is within the rated range? The power supply I'm considering is 350W 60V 5.8A since this would fit within the driver specs.

My question is, why is the input amperage limited and would the power supply i'm considering work ok with the driver? Thank you very much.

Motor Specs Voltage: 3.6V, Current: 5.6A/phase, Resistance: 0.6 Ohm/phase, Inductance: 6.5 mH/phase

Driver Specs Input Voltage: 24-80VDC, Input current: < 6A, Output current: 2.8A~7.8A

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  • \$\begingroup\$ run an amperage higher or equal to ... higher or equal to what? ..... also, the correct term is current, not amperage \$\endgroup\$ – jsotola Feb 21 at 3:11
  • \$\begingroup\$ Thanks for the correction. What I meant to say was that I thought you could have a higher power supply current relative to the driver input current. However, the driver I have has a current rating of less than 6A, which is what I don't understand. Why can't it accept a current higher than 6A? \$\endgroup\$ – user810279 Feb 21 at 22:51
  • \$\begingroup\$ Why can't it accept a current higher than 6A? .... because it is designed that way .... higher current will cause it to fail \$\endgroup\$ – jsotola Feb 23 at 3:01
  • \$\begingroup\$ Fair enough. Thanks for taking the time to respond. \$\endgroup\$ – user810279 Feb 23 at 19:19

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