SJ700-2 Instruction Manual NT204DX - Hitachi America, Ltd.
SJ700-2 Instruction Manual NT204DX - Hitachi America, Ltd.
SJ700-2 Instruction Manual NT204DX - Hitachi America, Ltd.
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Chapter 4 Explanation of Functions<br />
(Example 1) (Example 2)<br />
RS<br />
Alarm<br />
RS<br />
Alarm<br />
(Example 3)If you select "01" (starting with matching frequency) as the restart mode after reset (C103),<br />
you can also make the inverter start the motor with matching frequency after the power reset. When "00"<br />
(starting with 0 Hz) is selected as the restart mode after reset (C103), the setting of the retry wait time<br />
before motor restart (b003) is ignored. Note that, even when restarting with matching frequency has been<br />
selected, the inverter may start the motor with 0 Hz if:<br />
1) the output frequency is no more than half the base frequency or<br />
2) the voltage induced on the motor is attenuated quickly.<br />
3) the restart frequency threshold (b007) is set and the detected frequency is lower than that.<br />
FW<br />
Free running<br />
Starting with matching<br />
frequency<br />
Motor speed<br />
Note: The reset operation clears the inverter's internal counters that are used for protective functions.<br />
Therefore, if you intend to use an intelligent input terminal to shut off the inverter output, use the<br />
free-run stop (FRS) terminal.<br />
(Example 4) Restarting with active matching frequency<br />
FW<br />
RS<br />
Output current<br />
Inverter output<br />
frequency<br />
Motor speed<br />
Occurrence of trip<br />
b003<br />
b028<br />
Deceleration according to<br />
the setting of "b029"<br />
Frequency selected as the<br />
setting of "b030"<br />
After the retry wait time (b003), the<br />
inverter restarts the motor with the<br />
frequency set as "b030". The inverter<br />
subsequently decelerates the motor<br />
according to the setting of "b029"<br />
while maintaining the output current<br />
at the level specified for "b029".<br />
When the output voltage matches<br />
the frequency, the inverter<br />
re-accelerates the motor up to the<br />
frequency that was set when the<br />
inverter shut off the output to the<br />
motor before the restart.<br />
If the inverter trips because of<br />
overcurrent when it restarts the<br />
motor with input frequency, reduce<br />
the setting of "b028".<br />
(note) Inverter starts from 0Hz when reset signal is given during retry waiting because the frequency<br />
stored in inverter is cleared.<br />
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