Hitachi NES1-004SB Quick Reference Manual page 137

Chapter 7 Explanation of Functions
(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 1.5 3
(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 3
(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 terminal [11]
(C021) and the alarm relay terminal (C026).
And electronic thermal overload monitor is displayed on "d104".
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) 015L**, Base frequency60Hz,（rated current7.1A = b012）
60Hz （Reduction scale：x1.0）
Trip time (s)
Inverter output
frequency (Hz)
60
Function code
b015/b017/
b019
b016/b018/
current" to "1.0 x
b020
Inverter output
frequency (Hz)
40
Function code
C061
1. to 100. (%) (*1)
60
3.0
0
7.7 10.7 14.2[A]
(109%) (150% (200%)
)
Motor current (A)
(Ratio to the rated current of inverter)
Range of data
0. to 400. (Hz) Setting of frequency at each breakpoint
"0.2 x rated
Setting of the current at each breakpoint
rated current"
Output current (A)
b020
b018
b016
0
b015 b017 b019
Data
0. Disabling the warning output
Setting of the threshold level to output the
thermal warning signal
7 - 62
1.5Hz （Reduction scale：x0.9）
Trip time (s)
60
3.0
0
7.0 9.6
(98.1%) (135%
)
Motor current (A)
(Ratio to the rated current of inverter)
Description
A004/A204
Maximum
frequency (Hz)
Description
12.8[A]
(180%)