Feel free to give us a call - we'll gladly help you troubleshoot in detail at any time.
Note that no service request, email, or call has been made to us with machine and detail specifics regarding this issue, as of this posting.
Based on the description only, this documents a trip and reset of protection on the spindle drive, which displays the spindle halt alarm on the machine status display, and triggers the warning indicator.
Note that the spindle drive protection alarm is a signal generated by the spindle drive, not the main board. Hence disconnection of the drive to board signal cable causing it to cease. If there had been (or was) an issue with the main board, removing this cable would have had no affect on releasing the alarm.
If there was an active protection signal from the drive, removing this cable would have the effect described.
To clear a protection event on a drive, power needs to be totally removed from the machine for a short period to allow the drive's protection to reset during a re-boot of the drive's logic.
For general reference (not pertaining to this event as described), If there are secondary power or signal sources, or the machine is not off for a short period, this re-boot of the drive logic may not occur.
Additionally, depending on the nature of the fault that caused the alarm this reset can be instant or persistent during the drive's reboot to provide proper protection to the drive, and is something we would assist with when troubleshooting a customer's drive that had an active protection indicator.
The beep you describe just after the drive cable removal was the spindle drive re-booting, clearing the protection causing the alarm (the V2.0 drive itself makes a very short beep when it's booted).
It's likely this was a power on reboot of the drive's logic due to the drive's power supply being shorted out and going under voltage. If this was the case, In short, you got lucky that you didn't "let the magic smoke out of" the drive's on-board logic power supply, and/or the main board itself.
Both are systems in V2 are pretty robust as this attests to, but can be damaged depending on what a short is to, and for how long.
Also note for general reference (again, not specific to this description of events) that the same alarm noise is triggered by your spindle protection, E-stop and limits, which can cause confusion if you don't read the machine status display, and something we have on a long term development list as a desired refinement.
Lastly, this should be common sense ..... Do not attempt to service a machine with power on. There are hazards to those performing the task, and there's a huge chance you could damage something. Inadvertent shorts, such as this one documented, to internal signal control lines can cause damage to components.
Powering down, removing the cable & securing the end, then powering up, powering down, re-connecting, and then re-powering up would have had the same troubleshooting value at much less overall risk.
Mikini Mechatronics, LLC