September 11, 2025
Here’s the truth 👇🔹 Belt Broken (Fan Blower)(**) Possible with adjustable CSRMeasure normal fan motor running current (e.g., 3.2 A).Set CSR threshold slightly lower (say 2.0–2.5 A).If belt snaps, motor runs unloaded (~1.0 A) → CSR drops out → BMS raises “Fan Fail” alarm.🔹 Shaft Jam / Stuck(**) Not suitable for CSR.Jam causes current to rise (locked rotor condition).CSR only checks ON/OFF against a setpoint, not “too high current.”Correct detection = Thermal overload relay or VFD fault feedback.🔹 Models Commonly Used in BASVeris H908 / H909 (adjustable, split-core)Functional Devices (RIBXGTF)💡 Rule of Thumb:CSR → Motor proof + belt detection (adjustable type only).Overload relay / VFD → Shaft jam, overload, protection.(*) In BMS, using the right feedback device ensures reliable alarms, reduced downtime, and smarter controls.
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