Industry : -
Application : -
Motor rating : -
AC Induction Motor, 3-Phase
kW : 90
Volt : 415
RPM : 1480
Hz : 50
Amp : 146
Motor was running on DOL
Previous system :
Problem observed :
1) High maintenance cost
2) Energy losses due to flow control by valve.
Amtech 90 kW, Axpert-Eazy VFD used in place of DOL starter.
kW (Consumption) Valve Position
Previous system (Without drive):
40 kW 65 % Open
Previous system (With drive):
27 kW 100 % Open
Merits of new system :
1. Easy & smooth operation.
2. Energy saving due to flow control by VFD.
Energy consumption without VFD - P1 = 40 kW
Energy consumption with VFD - P2 = 27 kW
Energy saving per day ((P1 - P2) * 24) = 312 Units.
Saving per day @ Rs. 6/- Unit = Rs.1872 /-
Saving per year (Approx. 300 Days) = Rs.5,61,600 /-
Observation & Conclusion : -
The phase to phase insulation of cable near to motor terminal, was degrading due to heating, with passage of time and due to multiple removals/bendings of power cable connected to motor. When current flowing from cable generated, the heat caused expansion of aluminum resulting in phase to phase short leading to tripping of VFD . This was classic example of failure, not due to product VFD or Motor but due to problem beyond the product.