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Chapter 4
4.2.91 Deceleration and stopping at power failure (nonstop deceleration at instantaneous power failure)
The nonstop deceleration at instantaneous
power failure is the function making the
inverter decelerate and stop the motor
while maintaining the voltage below the
overvoltage level when an instantaneous
power failure occurs during the inverter
operation.
You can select three modes with controller
deceleration and stop on power loss (b050).
Item
Controller deceleration and stop on power loss
DC bus voltage trigger level during power loss
Over-voltage threshold during power loss (*1)
Deceleration time setting during power loss
Initial output frequency decrease during power loss
Proportional gain setting for nonstop operation at
momentary power failure
Integral time setting for nonstop operation at
momentary power failure
<1> nonstop deceleration at instantaneous power failure (b050=01)
- The nonstop deceleration at instantaneous power failure is the function making the inverter decelerate and stop the
motor while maintaining the voltage below the overvoltage level (over-voltage threshold during power loss [b052])
when an instantaneous power failure occurs during the inverter operation.
- To use this function, remove the J51 connector cables from terminals R0 and T0, connect the main circuit terminals P
and R0 to each other, and connect the main circuit terminals N and T0 to each other. Use 0.75 mm2 or heavier wires
for the connections.
- If an instantaneous power failure has occurred while the inverter is operating the motor and the output voltage falls
to the DC bus voltage trigger level during power loss (b051) or less, the inverter reduces the output frequency by the
initial output frequency decrease during power loss (b054) once, and then decelerates the motor for the
deceleration time setting during power loss (b053).
- If the voltage increases to an overvoltage level (exceeding the over-voltage threshold during power loss [b052])
because of regeneration, the inverter enters the LAD stop state until the voltage falls below the overvoltage level.
Note1:If the over-voltage threshold during power loss (b052) is less than the DC bus voltage trigger level during power
loss (b051), the over-voltage threshold during power loss will be increased to the DC bus voltage trigger level
during power loss when the stop level is applied. (However, the stored setting will not be changed.)
And, in case b052 is less than the supply voltage (equivalent to rectified DC voltage which is square root 2 times
supply AC voltage), when power recovers while this function is activated, inverter will be in the LAD stop status
and cannot decelerate. (Stop command and frequency change command are not accepted until deceleration is
completed). Be sure to set b052 more than the standard supply voltage.
Note2:This nonstop deceleration function cannot be canceled until the nonstop deceleration operation is completed.
To restart the inverter operation after power recovery, wait until the inverter stops, enter a stop command, and
then enter an operation command.
Voltage across main circuit
terminals P and N
VPN(V)
b052
b051
Undervoltage level
Output frequency
(Hz)
b054
b053
Related code
b050: Controller deceleration and stop on power loss
b051: DC bus voltage trigger level during power loss
b052: Over-voltage threshold during power loss
b053: Deceleration time setting during power loss
b054: Initial output frequency decrease during power loss Integral time setting
for nonstop operation at momentary power failure
b055: Proportional gain setting for nonstop operation at momentary power failure
b056: Integral time setting for nonstop operation at momentary power failure
Function code
Data or range of data
b050
b051
0.0 to 1000. (V)
b052
0.0 to 1000. (V)
b053
0.01 to 3600. (s)
b054
0.00 to 10.00 (Hz)
b055
0.00 to 2.55
0.0 to 9.999 /
b056
10.00 to 65.53
Note3:Setting higher initial out put frequency
Time
(sec)
Time
(sec)
4-83
Explanation of Functions
Description
Disabling the nonstop
00
deceleration function
Enabling the nonstop
01
deceleration function
02
03
Proportional gain at DC voltage
constant control(Only when "02"
or "03" is specified for b050)
Integral time at DC voltage
constant control(Only when "02"
or "03" is specified for b050)
decrease during powerloss (b054) results in
over current trip due to sudden
deceleration.
Setting lower b054, orlonger deceleration
time during powerloss (b053) results in
undervoltage trip due to less regeneration
power.
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