1. I

    Should I use a Regenerative Drive?

    A belt conveyor transports material 900 Tons/hr from a higher level to lower (130 meters). It is equipped with 2 motors of 132 kW 400V each. In the beginning motors drive the load and when material starts going down hill, the load is driving motors and the Motors RPM measured are 1509 against...
  2. I

    VFD Control of Hoist Motor and Break

    This 40 Tons overhead crane has a standard general purpose VFD with break chopper and also controls the mechanical break. The problem is it does not use DC breaking to hold the weight before applying or releasing the mechanical break. This results in very high wear of break leathers. A few times...