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Why Generator & Damper Interlock Matters in Critical Facilities

September 1, 2025

When a generator starts, it produces massive exhaust gases that must be safely discharged. If exhaust dampers fail to open, backpressure can damage the engine, overheat the system, and even create hazardous conditions.

That’s why we use a hardwired interlock between the generator and the exhaust damper:
✅ Damper Open Command – Before the generator cranks, the actuator is driven to the open position.
✅ Proof of Open End Switch – A dry contact closes only when the damper is fully open.
✅ Start Permissive Relay – The generator start circuit is wired in series through this proof signal. If the damper is not open, the generator won’t start.
✅ Run Status Feedback – The generator controller provides a run status back to the BMS for monitoring.

👉 For projects with multiple dampers, their proof contacts are wired in series—ensuring that all dampers must be open before the generator can start.

👉Benefits of Proper Interlock Design
🔹Enhanced safety and compliance
🔹Protects generator from backpressure damage
🔹Ensures reliable startup during emergencies
🔹Provides clear status signals to operators and BMS

In critical applications like hospitals, data centers, and airports, this interlock isn’t just best practice—it’s essential.

🔧 Always remember: Safety interlocks must be hardwired. BMS should monitor, not control, these protective loops.

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