4-37
(a) Reduced torque charcteristic
To add to the time limit characteristic set with the reduced time rate b012/b212 by each frequency.
(b) Constant torque characteristic
Set this in to use constant torque motor case.
(3) Free/thermal characteristic
It is possible to set the electronic thermal characteristic freely according to the load in order to protect the
motor and the Inverter.
Setting range is shown as follows;
Set item
Function code
Set range
Description
Free electronic thermal frequency
1/2/3
b015/b017/b019
0 to 400
Units : Hz
Free electronic thermal current 1/2/3 b016/b018/b020
0.0
0.1 to 999.9
disable
Units : A
Reduced rated ratio
Inverter output
Frequency (Hz)
X1.0
0
60
X0.9
X0.8
5
2.5
Reduced time ratio
Inverter output
Frequency (Hz)
X1.0
5
20
60
X0.8
X0.6
0
Motor current (A)
(Ratio for inverter rated current)
(Example)b012 = 44(A), when output frequency = 20Hz
Trip time
(S)
60
0.5
40.8
(92.8%)
42.2
(96%)
52.8
(120%)
0
(Example)b012 = 44(A), when output frequency=2.5Hz.
Trip time (S)
Motor current (A)
(Ratio for inverter rated current)
60
0.5
45.9
(104%)
47.52
(108%)
54.9
(125%)
0
(Example) b012=44(A), output frequency=b017
Trip time (S)
Motor current (A)
(ratio for inverter rated current)
60
0.5
(x) (y)
(z)
0
(x):b018x116%
(y):b018x120%
(z):b018x150%
Inverter output
Frequency (Hz)
Reduced time ratio
X1.
5
400
X0.8
0
A004/A204
Max. frequency(Hz)
b020
b018
b016
b015 b017 b019
0
Output current value (A)
Set range
Chapter 4 Explanation of function
