Mitsubishi Electric FR-A720-0.4K Instruction Manual page 269

(6) Power failure deceleration signal (Y46 signal)
⋅ After deceleration at an instantaneous power failure, inverter can not start even if the start command is given. In
this case, check the power failure deceleration signal (Y46 signal). (at occurrence of input phase failure protection
(E.ILF), etc.)
⋅ The Y46 signal is on during deceleration at an instantaneous power failure or during a stop after deceleration at an
instantaneous power failure.
⋅ For the Y46 signal, set "46 (positive logic)" or "146 (negative logic)" in any of Pr. 190 to Pr. 196 (output terminal
function selection) to assign the function.
REMARKS
When Pr. 872 = "1" (input phase failure protection provided) and Pr. 261
protection (E.ILF) is not provided but power-failure deceleration is made.
CAUTION
⋅ When Pr. 30 Regenerative function selection = "2" (FR-HC, MT-HC, FR-CV is used), the power failure deceleration function is
invalid.
⋅ When the (output frequency - Pr. 262) at undervoltage or power failure occurrence is negative, the calculation result is regarded
as 0Hz. (DC injection brake operation is performed without deceleration).
⋅ During a stop or error, the power failure stop selection is not performed.
⋅ Changing the terminal assignment using Pr. 190 to Pr. 196 (output terminal function selection) may affect the other functions. Please
make setting after confirming the function of each terminal.
If power-failure deceleration operation is set, some loads may cause the inverter to trip and the motor to coast.
The motor will coast if enough regenerative energy is given from the motor.
♦ Parameters referred to ♦
Pr. 12 DC injection brake operation voltage
Pr. 20 Acceleration/deceleration reference frequency, Pr. 21 Acceleration/deceleration time increments
Pr. 30 Regenerative function selection
Pr. 57 Restart coasting time
Pr. 190 to Pr. 196 (output terminal function selection)
Pr. 872 Input phase failure protection selection
CAUTION
Refer to page 194
Refer to page 197
Refer to page 253
Refer to page 228
Refer to page 263
Operation selection at power failure
and instantaneous power failure
≠
"0" (power failure stop function valid), input phase failure
Refer to page 168
4
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