SJ700-2 Instruction Manual NT204DX - Hitachi America, Ltd.
SJ700-2 Instruction Manual NT204DX - Hitachi America, Ltd.
SJ700-2 Instruction Manual NT204DX - Hitachi America, Ltd.
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
Chapter 4 Explanation of Functions<br />
4.2.91 Deceleration and stopping at power failure (nonstop deceleration at instantaneous<br />
power failure)<br />
Related code<br />
The nonstop deceleration at instantaneous power failure is b050: Controller deceleration and stop on power loss<br />
the function making the inverter decelerate and stop the<br />
b051: DC bus voltage trigger level during power loss<br />
b052: Over-voltage threshold during power loss<br />
motor while maintaining the voltage below the overvoltage<br />
b053: Deceleration time setting during power loss<br />
level when an instantaneous power failure occurs during b054: Initial output frequency decrease during power<br />
the inverter operation.<br />
loss Integral time setting for nonstop operation at<br />
You can select three modes with controller deceleration momentary power failure<br />
and stop on power loss (b050).<br />
b055: Proportional gain setting for nonstop operation<br />
at momentary power failure<br />
b056: Integral time setting for nonstop operation at<br />
momentary power failure<br />
Item Function code Data or range of data Description<br />
00<br />
Disabling the nonstop<br />
deceleration function<br />
Controller deceleration and stop on power loss<br />
b050<br />
01<br />
Enabling the nonstop<br />
deceleration function<br />
02<br />
03<br />
DC bus voltage trigger level during power loss b051 0.0 to 1000. (V)<br />
Over-voltage threshold during power loss (*1) b052 0.0 to 1000. (V)<br />
Deceleration time setting during power loss b053 0.01 to 3600. (s)<br />
Initial output frequency decrease during power loss b054 0.00 to 10.00 (Hz)<br />
Proportional gain setting for nonstop operation at<br />
momentary power failure<br />
Integral time setting for nonstop operation at<br />
momentary power failure<br />
b055 0.00 to 2.55<br />
b056<br />
4 - 84<br />
0.0 to 9.999 /<br />
10.00 to 65.53<br />
Proportional gain at DC voltage<br />
constant control(Only when<br />
"02" or "03" is specified for<br />
b050)<br />
Integral time at DC voltage<br />
constant control(Only when<br />
"02" or "03" is specified for<br />
b050)<br />
nonstop deceleration at instantaneous power failure (b050=01)<br />
- The nonstop deceleration at instantaneous power failure is the function making the inverter decelerate<br />
and stop the motor while maintaining the voltage below the overvoltage level (over-voltage threshold<br />
during power loss [b052]) when an instantaneous power failure occurs during the inverter operation.<br />
- To use this function, remove the J51 connector cables from terminals R0 and T0, connect the main circuit<br />
terminals P and R0 to each other, and connect the main circuit terminals N and T0 to each other. Use<br />
0.75 mm2 or heavier wires for the connections.<br />
- If an instantaneous power failure has occurred while the inverter is operating the motor and the output<br />
voltage falls to the DC bus voltage trigger level during power loss (b051) or less, the inverter reduces the<br />
output frequency by the initial output frequency decrease during power loss (b054) once, and then<br />
decelerates the motor for the deceleration time setting during power loss (b053).<br />
- If the voltage increases to an overvoltage level (exceeding the over-voltage threshold during power loss<br />
[b052]) because of regeneration, the inverter enters the LAD stop state until the voltage falls below the<br />
overvoltage level.<br />
Note1:If the over-voltage threshold during power loss (b052) is less than the DC bus voltage trigger level<br />
during power loss (b051), the over-voltage threshold during power loss will be increased to the DC<br />
bus voltage trigger level during power loss when the stop level is applied. (However, the stored<br />
setting will not be changed.)<br />
And, in case b052 is less than the supply voltage (equivalent to rectified DC voltage which is square<br />
root 2 times supply AC voltage), when power recovers while this function is activated, inverter will be<br />
in the LAD stop status and cannot decelerate. (Stop command and frequency change command are<br />
not accepted until deceleration is completed). Be sure to set b052 more than the standard supply<br />
voltage.<br />
Note2:This nonstop deceleration function cannot be canceled until the nonstop deceleration operation is<br />
completed. To restart the inverter operation after power recovery, wait until the inverter stops, enter<br />
a stop command, and then enter an operation command.<br />
Note3:Setting higher initial out put frequency decrease during powerloss (b054) results in over current trip<br />
due to sudden deceleration.<br />
Setting lower b054, orlonger deceleration time during powerloss (b053) results in undervoltage trip<br />
due to less regeneration power.
Change language