Omron RX Series - Motor Parameter Settings; Motor Capacity;Pole Number Selection; Electronic Thermal Function

5 Basic Settings
5 - 18
High-function General-purpose Inverter 3G3RX-V1 User’s Manual (I578-E1)
5-3 Motor Parameter Settings
Set the following parameters according to your motor.
The electronic thermal function prevents the motor from overloading and burning.
Set the rated current value of your motor in the Electronic Thermal Level parameters.
In the Electronic Thermal Characteristics Selection parameters, set the motor torque characteristics as
follows, according to the motor specifications.
Precautions for Correct UsePrecautions for Correct Use
• You cannot disable the electronic thermal function because it also provides overload protection
for the inverter.
• To connect several motors to a single inverter, set the Electronic Thermal Level to the rated
output current of the inverter and install a thermal relay etc. for each motor.
• Before setting the electronic thermal function, set the 1st/2nd Motor Capacity (H003/H203)
and the 1st/2nd Motor Pole Number (H004/H204) correctly according to your motor.
5-3-1 Motor Capacity/Pole Number Selection
Parameter
No.
Function name Data Default data Unit
H003 1st Motor Capacity
0.1/0.2/0.4/0.55/0.75/1.1/1.5/2.2/3.0/3.7/
4.0/5.5/7.5/11.0/15.0/18.5/22/30/37/45/55/
75/90/110/132
Maximum
applicable
motor capacity
kW
H203 2nd Motor Capacity
0.1/0.2/0.4/0.55/0.75/1.1/1.5/2.2/3.0/3.7/
4.0/5.5/7.5/11.0/15.0/18.5/22/30/37/45/55/
75/90/110/132
Maximum
applicable
motor capacity
kW
H004 1st Motor Pole Number 2/4/6/8/10 4 pole
H204 2nd Motor Pole Number 2/4/6/8/10 4 pole
5-3-2 Electronic Thermal Function
Characteristics Description
Reduced torque
characteristics
Use this setting for general-purpose 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.
Constant torque
characteristics
Use this setting for dedicated inverter motors.
Dedicated inverter motors are designed to prevent degradation of the cooling effect
that arises as the motor speed changes. This characteristics setting provides
overload detection independent of the motor rotation speed.