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DC Bus Voltage in VFD | Function, Formula & Testing | Complete Guide in English / Urdu

In this video, we will explain everything about DC Bus Voltage in a Variable Frequency Drive (VFD) —
how it is created, what its function is, and how to measure and test it using a multimeter safely.

You will also learn where the 1.35 or 1.41 multiplier comes from,
what ripple voltage means, and how to identify weak DC Bus capacitors or faults in the system.


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⚙️ Topics Covered:

What is DC Bus in a VFD

Function of DC Bus

DC Bus Voltage Formula (VDC = VL-L × 1.35)

Ripple Voltage Explained

How to Measure DC Bus Voltage using Multimeter

Normal Voltage Range (for 220V & 400V Systems)

Common DC Bus Faults (Overvoltage / Undervoltage / Capacitor Weak)

Safety Precautions during Measurement

🔢 Formulas Explained:

For 400V AC → 400 × 1.35 = ≈540V DC

For 230V AC → 230 × 1.35 = ≈310V DC


💡 Best For:

✅ Electricians
✅ Industrial Technicians
✅ Maintenance Engineers
✅ Electrical & Automation Students


📌 Watch till the end to understand how to check, test, and troubleshoot DC Bus Voltage like a professional and ensure your VFD system runs smoothly and safely.
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