The Plc Kid
Member
Guy's
I have a lot of oversized drives in the plant on purpose. In a lot of places we have a 20 HP drive connected to a 10 or 15 HP Motor to reduce spares.
This works well for us but i found a issue today that makes me ask the inverse of this setup. We have some equipment taht is just a little over a year old and has AB Powerflex 4 drives for conveyors and augers. There is 15 drives total.
All the motors are 460 volt 3 hp 1705 rpm 4.5 FLA and the drives are frame size A @ 2HP. Techs say they have replaced a lot of drives down there enough to bring it to my attention.
Can having a drive that is smaller than the driven motor cause problems? If so what? If the material jams the overcurrent protection in the drive kicks in but i am not sure if the larger motor can cause other problems.
I would think so because the motor is still trying to magnetize to capacity and the volts per hz has to be off a little also. This drive is running in scalar mode / open loop.
I have a lot of oversized drives in the plant on purpose. In a lot of places we have a 20 HP drive connected to a 10 or 15 HP Motor to reduce spares.
This works well for us but i found a issue today that makes me ask the inverse of this setup. We have some equipment taht is just a little over a year old and has AB Powerflex 4 drives for conveyors and augers. There is 15 drives total.
All the motors are 460 volt 3 hp 1705 rpm 4.5 FLA and the drives are frame size A @ 2HP. Techs say they have replaced a lot of drives down there enough to bring it to my attention.
Can having a drive that is smaller than the driven motor cause problems? If so what? If the material jams the overcurrent protection in the drive kicks in but i am not sure if the larger motor can cause other problems.
I would think so because the motor is still trying to magnetize to capacity and the volts per hz has to be off a little also. This drive is running in scalar mode / open loop.