Omron RX Series - Page 217

5 - 21
5 Basic Settings
High-function General-purpose Inverter 3G3RX-V1 User’s Manual (I578-E1)
5-3 Motor Parameter Settings
5
5-3-2 Electronic Thermal Function
 Reduced Torque Characteristics
Use the reduced torque characteristics setting for general-purpose (standard) motors.
In an air-cooled motor that uses the rear fan coupled directly to the motor shaft, the cooling effect
degrades as the motor rotation speed decreases.
This characteristics setting enables overload detection that takes into account such degradation of
the cooling effect at low speeds.
Reduction Factor Characteristics
 Constant Torque Characteristics
Use the reduced torque characteristics setting for dedicated inverter motors.
Dedicated inverter motors are designed to prevent degradation of the cooling effect that arises as
the motor speed changes, except at 5 Hz or less.
For constant torque characteristics, the reduction factor is defined only for frequencies of 5 Hz or
less.
Reduction Factor Characteristics
Reduction
factor
x1.0
x0.8
x0.6
0
0
5
6
16
20
50
60
Inverter output
frequency [Hz]
Base frequency
x1.0
x0.8
x0.6
02.5
560
Reduction
factor
Inverter output
frequency [Hz]