7 Detailed Functions
7 - 66
High-function General-purpose Inverter 3G3RX-V1 User’s Manual (I578-E1)
• The electronic thermal function prevents the motor from overloading and burning.
• Before setting the electronic thermal function, set the 1st/2nd Motor Capacity (H003/H203) and the
1st/2nd Motor Pole Number (H004/H204) according to your motor. This switches the parameters that
can be set.
• Set the rated current of your motor in the 1st/2nd/3rd Electronic Thermal Level (b012/b212/b312)
and, in the 1st/2nd/3rd Electronic Thermal Characteristics Selection (b013/b213/b313), set the motor
torque characteristics as follows, according to the motor specifications.
• The electronic thermal function can be to output an electronic thermal warning before the inverter
detects an overload.
• To check the status of the electronic thermal function, use the Electronic Thermal Load Rate Monitor
(d104).
An Overload trip (E05) error will occur if the value reaches approximately 100%.
• 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.
• When the 1st/2nd/3rd Electronic Thermal Characteristics Selection (b013/b213/b313) is set to
02 (Free setting), you need to set a frequency value in the Free-electronic Thermal Frequency
1 to 3. Otherwise, a warning will occur.
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 increases. This characteristics setting provides overload
detection independent of the motor rotation speed.
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
*1
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
*1
2/4/6/8/10 4 pole
b012
1st Electronic Thermal
Level
0.20 x Rated current to 1.00 x Rated
current (Set to match the rated
current of your motor.)
*2
Rated current
of Inverter
A
b212
2nd Electronic Thermal
Level
*1
b312
3rd Electronic Thermal
Level
*1
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