Problem Found: 1. VFD (-) Hz showing 2. Non-return Valve damaged. 3. Reverse water flow. 4. The pump acts as a generator due to self-excitation
Checking Procedure :
- Pump coil resistance check- Normal
- Pump current Check – Normal
- VFD input voltage check – Normal
- VFD output voltage check – Normal
- Terminal Block tightness check – OK
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