Hitachi SJ700-2 - Manual (Page 105)

Chapter 4 Explanation of Functions
4.2.33 Start frequency setting
b082: Start frequency adjustment
Related code
The start frequency setting function allows you to specify the inverter
output frequency that the inverter initially outputs when an operation
command is input.
Use this function mainly to adjust the start torque.
If the start frequency (b082) is set too high, the inverter will start the motor with a full voltage, which will
increase the start current. Such status may trigger the overload restriction operation or make the inverter
prone to easily tripping because of the overcurrent protection.
Specifying "04" (0SLV: 0Hz-range sensorless vector control) or "05" (V2: vector control with sensor) for the
V/F characteristic curve selection (A044) disables the start frequency setting function.
Item Function code Range of data Description
Start frequency
adjustment
b082 0.10 to 9.99 (Hz) Setting of the start frequency
FW
requency
age
b082
Output f
Output volt
4.2.34 Reduced voltage start function
b036: Reduced voltage start selection
b082: Start frequency adjustment
Related code
The reduced voltage start function enables you to make the inverter
increase the output voltage gradually when starting the motor.
Set a small value for the reduced voltage start selection (b036) if you
intend to increase the start torque. On the other hand, setting a small
value will cause the inverter to perform full-voltage starting and to easily
trip because of overcurrent.
Item Function code Range of data Description
00 Disabling the reduced voltage starting
Reduced voltage start
selection
b036
01 to 255
01: Short (about 6 ms)
255: Long (about 1.53 s)
00 01 06 ･･･ Reduced Voltage Start
b036
Start frequency
b082
FW
Output frequency
Output voltage
4 - 4
2