Mitsubishi Electric F700 Instruction Manual page 139

(4) Original operation continuation at instantaneous power failure function (Pr. 261 = "2")
⋅ When power is restored during deceleration after an instantaneous 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 operation,
deceleration can be made at a power failure and acceleration can be made again after power restoration. When
power is restored after a stop by deceleration at an instantaneous power failure, automatic restart operation is
performed if automatic restart after instantaneous power failure has been selected (Pr. 57 ≠ "9999")
When power is restored during
Pr.261 = 2
deceleration at occurrence of
power failure
IPF
Power
supply
Output
frequency
During deceleration
at occurrence of
power failure
Y46
*Acceleration time is as set in Pr.7 (Pr.44).
(5) 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 (forward action)" or "146 (reverse action)" 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 terminals. 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
Power
supply
Output
frequency
Reacceleration*
Time
CAUTION
Refer to page 98
Refer to page 99
Refer to page 126
Refer to page 107
Refer to page 135
Operation selection at power failure
and instantaneous power failure
When used with automatic restart
Pr.261 = 2, Pr.57
9999
after instantaneous power failure
During power failure
During deceleration
at occurrence of
power failure
Y46
≠
"0" (power failure stop function valid), input phase failure
Automatic restart
after instantaneous
power failure
Time
Reset time + Pr.57
Refer to page 91
4
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