This machine is an Arrow2 750 (Acramatic 2100) with Siemens drives.

We are having an issue related to the x-axis drive

With the machine cutting or even sitting idle after alignment - we get an intermittent alarm "NCA - Axis pulse enable alarm" then subsequent "NCA - X-axis drive alarm". Alarm code on the Simodrive readout is A608

The machine may sometimes run all day or alarms out a few minutes after powering on and aligning the axis.

Both the Simodrive for x/z axis and x-axis motor have been sent out for repair/diagnostics, yet the problem still exists.

We've replaced the DP profi card due to an unrelated (or so I think) issue which caused the machine to fail boot diagnostics. The machine now boots and is operable until the alarm.

We've checked continuity and resistance through the com cable between the drive and the motor as well as the power lead with no obvious issues.

If the machine is idle and the rest of the shop is quiet you can here a harmonic hum noise coming from the end of the ball screw opposite the x-axis motor. When you go to manually move the axis it alarms out as described.