While it "shouldn't" be an issue, it could still possibly be an issue.
Are you able to monitor the power supply output voltage and waveform under load, preferably with an oscilloscope, or with a multimeter (voltage only) if a scope is not available?
Also, just curious, are you using current-setting resistors (what values?), and are they physically installed at the G540 axis connectors or at the motors?


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