Mitsubishi Electric 800 Series Instruction Manual page 375

 Continuous operation function at instantaneous power failure (Pr.261 =
"2")
• The motor re-accelerates to the set frequency when the power restores during the deceleration triggered by a power
failure.
If the power is restored after stoppage by a power failure, a restart operation is performed when automatic restart after
instantaneous power failure (Pr.57 ≠ "9999") is selected.
Pr.261 = 2
Power
supply
Output
frequency
During deceleration
at occurrence of
power failure
Y46
*1 Acceleration time depends on Pr.7 (Pr.44)
 During deceleration at occurrence of power failure (Y46) signal
• After deceleration by a power failure, the inverter is not restarted even though the start command is input. Check the During
deceleration at occurrence of power failure (Y46) signal at a power failure. (For example, when input phase loss protection
(E.ILF) occurs.)
• The Y46 signal is turned ON during deceleration at occurrence of power failure and in a stop status after deceleration at
occurrence of power failure.
• For the Y46 signal, set "46" (positive logic) or "146" (negative logic) in any parameter from Pr.190 to Pr.196 (Output
terminal function selection) to assign the function.
NOTE
• The power failure time deceleration stop function is disabled during a stop or when the breaker is tripped.
• Changing the terminal assignment using Pr.190 to Pr.196 (Output terminal function selection) may affect the other
functions. Set parameters after confirming the function of each terminal.
CAUTION
• Even if the power failure time deceleration-to-stop function is set, some loads might cause the inverter to trip and the
motor to coast.
The motor coasts if sufficient regenerative power is not obtained from the motor.
Parameters referred to
Pr.57 Restart coasting timepage
Pr.190 to Pr.196 (Output terminal function
374
14.(A) Application Parameters
14.10 Power failure time deceleration-to-stop function
When power is restored during
deceleration at occurrence of
power failure
IPF
Reacceleration*1
Time
362, page 367
selection)page 258
Pr.261 = 2, Pr.57 ≠ 9999
During power failure
Power
supply
Output
frequency
During deceleration
at occurrence of
power failure
Y46
When used with automatic restart
after instantaneous power failure
Automatic restart
after instantaneous
power failure
Time
Reset time + Pr.57