Mitsubishi Electric FR-A720-0.4K Instruction Manual page 282

Pr.261 = 1
Power
supply
During deceleration at
occurrence of power failure
During stop at
occurrence of
power failure
STF
Y46
Turn OFF STF once to make acceleration again
(4) Original operation continuation at instantaneous power failure function (Pr. 261 = "2, 12")
⋅ 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")
(5) Undervoltage avoidance function (Pr. 261 = "11, 12", Pr. 294 )
⋅ When Pr. 261 = "11, 12", the deceleration time is automatically adjusted (shortened) to prevent undervoltage from
occurring during deceleration at an instantaneous power failure.
⋅ Adjust the slope of frequency decrease and response level with Pr. 294. A larger setting will improve
responsiveness to the bus voltage.
REMARKS
Undervoltage avoidance function is invalid during torque control by Real sensorless vector control. When Pr. 261 = "11 (12)", the
inverter operates in the same manner as when "1 (2)" is set in Pr. 261.
(3) Power failure stop function (Pr. 261 = "1, 11")
⋅ If power is restored during power failure deceleration, deceleration to
a stop is continued and the inverter remains stopped. To restart, turn
OFF the start signal once, then turn it ON again.
REMARKS
Power supply
Time
STF
Y46
⋅
When automatic restart after instantaneous power failure is selected (Pr.
≠
"9999"), deceleration to stop function is invalid and the restart after
57
instantaneous power failure operation is performed.
⋅
When the power failure stop function is active (Pr.261 = "1, 11"), the inverter will
not start even if the power is turned ON with the start signal (STF/STR) ON. After
switching ON the power supply, turn OFF the start signal once and then ON again
to make a start.
Pr. 261 = 2
Power
supply
Output
frequency
Y46
* Acceleration time depends on Pr. 7 (Pr. 44 ).
Pr.261 = 2, Pr.57
Power
supply
Output
frequency
During deceleration
at occurrence of
power failure
Y46
Operation selection at power failure
and instantaneous power failure
ON
Not started as inverter Output
is stopped due to power frequency
failure
OFF
ON
ON
When power is restored during
deceleration at occurrence of
power failure
IPF
During deceleration
at occurrence of
Reacceleration*
power failure
When used with automatic restart
9999
after instantaneous power failure
During power failure
Reset time + Pr.57
Time
Time
Automatic restart
after instantaneous
power failure
Time
4
271