What factors affect the current of a centrifugal fan?

First, check the motor nameplate.
For example, a 55 kW variable frequency motor has a rated current of 101.6 amps at 380 volts.
If the voltage is increased to 660 volts, the current drops to about 58.5 amps.

So from the nameplate, we can see:
higher voltage means lower current. That’s the first factor.

The second factor is the fan’s working condition.
If the airflow is large, the current will be higher.
If the airflow is small, the current will be lower.

For example, if you use a valve to completely block the fan inlet,
the resistance increases, the airflow decreases,
and the current will also drop.

So, what’s your fan current right now?
Leave it in the comments, and I’ll help you check if it’s within a safe range!