Cast Iron Series
Inverter Rated Motors
Frequency Inverter Or VFD Duty
(A) Where speed of the motor is to be reduced approximately up to 50% of the rated speed. An integral (directly driven) fan mounted on the motor shaft provides sufficient cooling (IC41 Cooling). Hence only insulation system becomes important which provides protection against voltage spikes and surges.
(B) Where the speed of the motor to be reduced further the integral fan mounted on the motor shaft becomes inactive OR when the speed of the motor is to be increased with a frequency above 60 Hz, the integral fan overloads the motor. In such a situation, it becomes very important to provide cooling by a separately powered fan servo ventilation (IC 46 cooling) Servo ventilation (IC 46 cooling) is available from frame size 71 t0 225M.
Servo Ventilated motors, encoder fitted motors with or without servo ventilation are longer then the standard motor. Conform the length at the time of selection.