Commercial Lighting Case Study: Troubleshooting Complex Relay Failures
When a commercial electrical issue arises, the symptoms don’t always point directly to the cause. What starts as a minor request—like a single non-functioning exit sign—can often reveal a deeper system failure.
In this case study, we break down a recent commercial electrical repair where a routine service call turned into a complex diagnostic mission involving WattStopper relay panels and circuit mapping.
The Problem: A Dark Exit Sign and 30 Dead Lights
The initial service call reported a non-functioning exit sign in a retail environment. However, upon arrival, our team identified a broader issue. While the exit sign had no power, tracing the circuit revealed that 30 overhead lights across the store were also inoperative.
Step 1: Initial Circuit Diagnostics
We began by tracing the circuit back to the main electrical panel. While we identified two unrelated tripped breakers and reset them, power remained cut off from the lighting group. This indicated that the “break” in the circuit wasn’t at the breaker, but further down the line.
Step 2: Navigating the WattStopper Relay Panel
Modern commercial buildings often use automated lighting controls for energy efficiency. We located the WattStopper relay control panel and began a systematic diagnostic:
- Schematic Review: We mapped the circuits between the breakers, the relays, and the light fixtures.
- Power Testing: We tested each relay for “power in” versus “power out.”
- Identifying the Failure: We found a specific failed relay that was receiving voltage but failing to output it to the floor.
Step 3: The “Normal Closed” Diagnostic Hurdle
One factor that extended the diagnostic time was that the relay panels were not powered and were functioning as normally closed bypasses. This configuration can be deceptive during testing, but by installing a temporary jumper, we confirmed our diagnosis and instantly restored lighting to the affected areas.
The Solution: Permanent Repair and Component Replacement
To ensure a reliable, long-term fix, we:
- Replaced the Failed Relay: We swapped the defective unit with a functional relay from an unused circuit.
- Verified Operation: We tested the entire lighting grid to ensure consistent power delivery.
- Installed a New Exit Sign: Once power was restored to the circuit, we determined the original exit sign unit was defective. We replaced it with a new, high-efficiency LED model.
Key Takeaways for Commercial Facility Managers
- Symptoms can be deceptive: A single dead sign may indicate a larger relay failure in your WattStopper system.
- Expertise Matters: Navigating relay logic and system schematics requires a specialized commercial electrician.
- Preventative Maintenance: Regular testing of control panels can prevent large-scale lighting outages that disrupt business operations.
Are you experiencing intermittent lighting issues or control panel failures? Give us a call today and let us do an inspection. Residential or commercial.
CHS Home Solutions
314-304-5942
Office@chshomesolutions.com