Intermittent Bus Power Fault on C-10 Robot with NexBot Vision 512-011 Cable

Description

We are experiencing random shutdowns on one of our C-10 series robots on the main assembly line. The controller is logging a generic bus power undervoltage error, E-3114, which forces the arm into a protective stop. The issue occurs intermittently, sometimes hours apart, causing significant production delays. We have isolated the problem by swapping the controller and the power supply with a known-good unit, but the fault persists on this specific robot cell. Our maintenance technician noticed that the fault can sometimes be triggered by manually wiggling the main bus power cable, specifically the NexBot Vision 512-011 Bus Power Cable (SKU: NXB-CBL-512-011), near the connector at the robot base. We suspect an internal break or a compromised connection in the cable, possibly due to repeated flexing during operation. The cable was installed 18 months ago and is routed through a standard flexible conduit.

Symptoms

• Robot enters a fault state and stops unexpectedly.
• Controller logs a bus power undervoltage error.
• The power indicator LED at the robot base flickers just before a fault.
• Physical manipulation of the bus power cable can trigger the fault.

Resolution

An on-site inspection confirmed the customer's diagnosis. The NexBot Vision 512-011 Bus Power Cable had developed an intermittent internal break approximately 5cm from the robot-side connector. This was caused by excessive torsional stress over time due to the lack of proper strain relief. The cable was replaced with a new unit (SKU: NXB-CBL-512-011) and a strain relief bracket was added to the robot base to properly secure the cable and prevent a recurrence. The system was tested under load for two hours with no further faults. The customer was advised to inspect other similar installations for inadequate strain relief.

Resolution Steps

1. Perform Lockout/Tagout (LOTO) procedure on the affected robot cell.
2. Disconnect the faulty NXB-CBL-512-011 cable from both the controller cabinet and the robot base.
3. Visually inspect the old cable's connectors for any pin damage or corrosion; none was found.
4. Install the new NXB-CBL-512-011 Bus Power Cable, ensuring both M12 connectors are fully seated and tightened to specification to maintain the IP67 seal.
5. Install a recommended cable strain relief bracket at the robot base connection point.
6. Remove LOTO and power on the robot system.
7. Clear the E-3114 fault from the controller's error log.
8. Run the robot through a rigorous test cycle, ensuring it moves through its entire range of motion, for a minimum of 60 minutes to confirm the issue is resolved.