Spindle and spindle system with logic supply bus fault diagnostics

A spindle system comprising:

• a bus control device configured to control a power bus and a logic supply bus;
• and
• a plurality of spindle assemblies, each spindle assembly being powered via an operable coupling to the power bus and the logic supply bus, each spindle assembly being controlled via communications with the bus control device, the plurality of spindle assemblies comprising a first spindle assembly;
• wherein the first spindle assembly comprises:
• a power source interface configured to be operably coupled to the power bus and power the first spindle assembly via the power bus;
• a spindle controller comprising processing circuitry;
• a diagnostic switch assembly operably coupled to the spindle controller and operably coupled to a logic supply bus;
• and
• a working apparatus comprising a motor and a spindle operably coupled to the spindle controller, the working apparatus being controllable by the spindle controller to act upon a work piece to perform a work task;
• wherein the diagnostic switch assembly comprises a first switch, a second switch, and a shunt resistor connected to the logic supply bus;
• the first switch being controllable to open circuit the logic supply bus and the second switch being controllable to connect a resistance in series with the logic supply bus when the first switch is open;
• wherein the processing circuitry of the spindle controller is powered by the logic supply bus and is configured to:
• receive a fault localization instruction from the bus control device;
• and
• control the diagnostic switch assembly to determine a presence and a location of a fault on the logic supply bus by being configured to:
• control the first switch and the second switch to generate a reduced bus voltage on the logic supply bus, the reduced bus voltage being less than a nominal logic supply bus operating voltage;
• measure a current through the shunt resistor at the reduced bus voltage;
• and
• transmit a responsive communication to the bus control device indicative of the current measured through the shunt resistor for use in determining the presence and the location of the fault on the logic supply bus.

A spindle assembly comprising:

• a power source interface configured to be operably coupled to a power bus and power the spindle assembly via the power bus;
• a spindle controller comprising processing circuitry, the spindle controller being power by a logic supply bus;
• a diagnostic switch assembly operably coupled to the spindle controller and operably coupled to the logic supply bus;
• and
• a working apparatus comprising a motor and a spindle operably coupled to the spindle controller, the working apparatus being controllable by the spindle controller to act upon a work piece to perform a work task;
• wherein the processing circuitry of the spindle controller is configured to:
• receive a fault localization instruction from a bus control device operably coupled to the logic supply bus;
• and
• control the diagnostic switch assembly to determine a presence and a location of a fault on the logic supply bus;
• and
• transmit a responsive communication to the bus control device indicative of the presence and the location of the fault.