VFD Control through BMS | Energy Saving Logic
🧠 In modern buildings, energy saving doesn’t come from switching systems ON/OFF — it comes from smart speed control.
That’s where VFD (Variable Frequency Drive) plays a critical role in BMS.
🔹 How VFD Works with BMS
BMS sends a speed reference signal (0–10V / 4–20mA / BACnet) to the VFD instead of a simple start–stop command.
VFD Control through BMS | Energy Saving Logic
🧠 In modern buildings, energy saving doesn’t come from switching systems ON/OFF — it comes from smart speed control.
That’s where VFD (Variable Frequency Drive) plays a critical role in BMS.
🔹 How VFD Works with BMS
BMS sends a speed reference signal (0–10V / 4–20mA / BACnet) to the VFD instead of a simple start–stop command.
The VFD then: ✔️ Adjusts motor speed
✔️ Matches system demand
✔️ Reduces unnecessary power consumption
🔹 Where VFD is used in BMS
• AHU supply & return fans
• Chilled water pumps
• Condenser water pumps
• Cooling tower fans
• Pressurization & exhaust fans
🔹 Smart Control Logic (Real Example)
🔸 Low cooling demand → Fan runs at low speed
🔸 High demand → Speed increases automatically
🔸 Static pressure stable → No energy wastage
📉 Even 20% speed reduction can save nearly 50% energy on motors.
🔹 Why VFD + BMS is powerful
✔️ Smooth system operation
✔️ Longer motor life
✔️ Reduced electrical load
✔️ Precise pressure & flow control
✔️ Major energy cost reduction
🧠 Engineer’s Insight
A properly tuned VFD logic with BMS feedback can reduce HVAC energy consumption by 30–45% without changing any mechanical equipment.
👉 Follow Faraz Hussain for daily BMS, HVAC & automation field-level learning.
Source/Credit: LinkedIn Page of Faraz Hussain
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