SJ700
2
Inverter
Configur
ing Dr
iv
e
P
a
ra
met
e
rs
3–43
• 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 (deceler-
ate to stop) until the voltage falls below the overvoltage level.
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 lower than the supply voltage
(equivalent to rectified DC voltage which is square root of 2 times the 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 complete). Be sure to set b052 higher than the normal supply voltage.
Func.
Code
Name/
Description
Keypad
Range and Settings
Defaults
Run
Mode
Edit
Lo Hi
SRW
OPE
FEF2
FE2
(EU)
FUF2
FU2
(USA)
FF2
F2
(Jpn)
B050
Controlled deceleration
and stop on power loss
OFF
00
Disable
00
00
00
✘ ✘
Allows inverter control
using regenerative energy
to decelerate after loss of
input power (requires
jumper change)
DEC
0 1
Constant decel to stop
✘ ✘
NS1
02
Constant DC voltage control
with resume
✘ ✘
NS2
03
Constant DC voltage control
✘ ✘
B051
DC bus voltage trigger level during power
loss
0.0 to 999.9, 1000. (V)
220.0/
440.0
220.0/
440.0
220.0/
440.0
✘ ✘
Sets trigger for controlled deceleration and
stop on power loss function
B052
Over-voltage threshold during power loss
0.0 to 999.9, 1000. (V)
360.0/
720.0
360.0/
720.0
360.0/
720.0
✘ ✘
Sets over-voltage threshold for controlled
deceleration function
B053
Deceleration time setting during power loss
0.01 to 99.99, 100.0 to 999.9,
1000 to 3600 (seconds)
1.00
1.00
1.00
✘ ✘
B054
Initial output frequency decrease during
power loss
0.00 to 10.00 (Hz)
0.00
0.00
0.00
✘ ✘
Sets the initial decrease in output frequency
upon power loss
B055
Proportional gain setting for non-stop
operation at power loss
0.00 to 2.55
0.20
0.20
0.20
✘ ✘
B056
Integral time setting for non-stop operation
at power loss
0.0 to 9.999, 10.00 to 65.55
0.10
0.10
0.10
✘ ✘