You may always want to look at the power quality during start-up. This was an issue one of VFDs experts always checked when large VFDs needed to be run by a back-up generator. If your VFD is large enough compared to your generator then there can be issues with the semi-conductors on the VFD firing correctly. Line reactors are the best way to compensate that but mostly users don't use the reactors for small rating VFDs. If your small rating variable frequency drive (VFD) getting damage then there may be a voltage spikes issue because according to the thumb rule if the transformer KVA rating is 10 times of KVA rating of VFD, say a 100 kVA transformer for 10 hp VFD, then it is subjected to voltage spikes that can damage it. Tips: Small rating VFD will damage if connect it to high rating transformer –20℃~ +60℃ no dust, no corrosive gas, no direct sunlight ≤1000m VFD will be derated if above 1000m –10℃~ +40℃ VFD will be derated if ambient temperature exceed 40℃ each rise 1℃, the derate will be 5%

Limit running current automatically to avoid frequent over-current which will cause trip Optimize V/F curve automatically based on the load to realize power save runningĬan keep constant output voltage when power source voltage varies. 10 hp variable frequency drive, three phase 220V /440V /480V ☑5%.ģ phase 220V /440V /480V AC ☑5% (Optional)ġ50% of rated current for 1 minute, 180% of rated current for 3 secondsĪutomatic torque boost, manual torque boost 0.1%~30.0%

Variable frequency drive 10 hp