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Chapter 4
(b) Constant-torque characteristic
Make this setting when driving a constant-torque motor with the inverter.
Reduction
scale
X1.0
X0.9
X0.8
0
2.5
5
(c) Free setting of electronic thermal characteristic
To protect the motor against overheating, you can set the electronic thermal characteristic freely according to the load
on the motor.
The range of setting is shown in the figures below.
Item
Free setting, electronic
thermal frequency (1) (2) (3)
Free setting, electronic
thermal current (1) (2) (3)
X1.0
Range of
X0.8
setting
0
5
(Example) When the output frequency is equal to
the setting of "b017"
Trip time (s)
60
3.0
0
(x) (y)
(3) Thermal warning
You can configure this function so that the inverter outputs a warning signal before the electronic thermal protection
operates against motor overheat. You can also set the threshold level to output a warning signal with the electronic
thermal warning level setting (C061).
To output the warning signal, assign function "13" (THM) to one of the intelligent output terminals [11] to [15] (C021
to C025) and the alarm relay terminal (C026).
Item
Electronic thermal
warning level setting
*1 Set the ratio (%) of the warning level to the integrated value of the electronic thermal characteristic. A setting of
100% corresponds to the inverter trip due to overload (error code "E05").
(Example) Setting on the SJ700D-150LFF3 (CT mode rated current: 64 A)
When "b012" is 64 A, and output frequency is 2.5 Hz:
Inverter output
frequency (Hz)
60
Function code
Range of data
b015/b017/
0. to 400. (Hz)
b019
b016/b018/
0.1 to rated
b020
current. (A)
Inverter output
frequency (Hz)
40
(x): ("setting of b018"/"rated current") x 109%
(y): ("setting of b018"/"rated current") x 150%
(z): ("setting of b018"/"rated current") x 200%
(z)
Function code
C061
1. to 100. (%) (*1)
Explanation of Functions
Trip time (s)
60
3.0
0
62.8
(98.1%)
(135%)
Setting of frequency at each breakpoint
0.0 (A)
Disabling the electronic thermal protection
Setting of the current at each breakpoint
Output
current (A)
b020
b018
b016
b01
0
Data
0.
Disabling the warning output
Setting of the threshold level to output the thermal
warning signal
4-38
Motor current (A)
86.4
115.2
(Ratio to the rated
(180%)
current of inverter)
Description
b017
b019
A004/A204/A304
5
Maximum frequency (Hz)
Description
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