Organization –

HSBC

Location –

Gandhinagar, Gujarat

Domain –

Banking Corporation

Solution Offered –

Root Cause Analysis and Solution Implementation

Overview – 

The UPS is a critical component for ensuring reliable power supply. Any faults can lead to interruptions in operations, necessitating prompt identification and resolution of the issues.
This Root Cause Analysis (RCA) Report addresses an incident that occurred on 22nd August 2024, where the UPS at the site indicated an inverter fault and DC Bus unbalance during normal operation. Upon inspection, it was observed that the UPS’s internal DC bus was not generating properly, with the rectifier section failing to switch correctly.

Challenges –

• Inverter Faults: The UPS indicated an inverter fault and DC bus unbalance, which could lead to power supply failures.
• Equipment Isolation: The need to isolate the faulty UPS from the load and ensure a seamless transition to standby equipment.
• Diagnosis Complexity: Identifying the root cause of the faults required a detailed analysis of the UPS’s internal components.

Solutions –

1. Isolation: The faulty UPS was isolated from the load to prevent further issues.
2. Disconnection: The UPS input, output, and battery connections were disconnected.
3. Standby Equipment: Standby UPS was connected to maintain the power supply as per the schedule.
4. Repair and Testing: The faulty UPS was sent to the Technical Repair Center (TRC) for thorough testing and repairs.

Benefits –

• Minimized Downtime: The swift action to isolate the faulty UPS and connect standby equipment ensured minimal disruption to operations.
• Enhanced Reliability: Repairing and testing the UPS ensures future reliability, reducing the likelihood of similar faults.
• Improved Monitoring: The analysis identified key areas of improvement in monitoring UPS’s health, leading to proactive maintenance strategies.

Conclusion –

The analysis confirmed that an open feedback track in the rectifier DC bus was the cause of the voltage unbalance. Following repairs, the new driver PCB will be installed, which should rectify the identified issues and enhance the overall functionality of the UPS.

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