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Operation selection at power failure and instantaneous power failure
(4) Operation continuation at instantaneous power failure function (Pr. 261 = "2")
When power is restored during deceleration after a power failure, acceleration is made again up to the set frequency.
When this function is used in combination with the automatic restart after instantaneous power failure function (Pr.57
"9999"), deceleration can be made at a power failure and acceleration can be made again after power restoration.
Pr. 261 = 2
When power is restored during deceleration
at occurrence of power failure
Power
Output
frequency
During deceleration at
occurrence of power failure
Y46
* Acceleration time depends on Pr. 7 (Pr. 44).
NOTE
When operation continuation at instantaneous power failure function is used, keep the starting signal (STF/STR) ON
even during instantaneous power failure. If the starting signal turns OFF during instantaneous power failure, the
motor decelerates according to the deceleration time setting, causing the motor to coast if enough regenerative
energy is not obtained.
(5) Power failure deceleration signal (Y46 signal)
The Y46 signal is ON during deceleration at an instantaneous power failure or during a stop after deceleration at an
instantaneous power failure.
After a power failure stop, the inverter cannot start even if power is restored and the start command is given. In this case,
check the power failure deceleration signal (Y46 signal). (at occurrence of input phase loss (E.ILF), etc.)
For the Y46 signal, set "46 (positive logic)" or "146 (negative logic)" to Pr. 190, Pr. 192 or Pr. 197 (output terminal function
selection) to assign the function.
REMARKS
During a stop or trip, the power failure stop selection is not performed.
NOTE
Changing the terminal assignment using Pr. 190, Pr. 192, and Pr. 197 (output terminal function selection) may affect the
other functions. Set parameters after confirming the function of each terminal.
Even if the power failure stop function is valid, some loads may cause the inverter to trip and the motor to
coast.
The motor will coast if enough regenerative energy is not given from the motor to the inverter.
Parameters referred to
Pr. 57 Restart coasting time
Pr. 190, Pr. 192, Pr. 197 (output terminal function selection)
146
IPF
Reacceleration
Time
ON
CAUTION
Refer to page 139.
Pr. 261 = 2, Pr. 57
When used with automatic restart
after instantaneous power failure
During power failure
Power
Output
frequency
During deceleration at
occurrence of power failure
Y46
Refer to page 122.
9999
Automatic restart
after instantaneous
power failure
Time
Reset time + Pr. 57
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