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Operation selection at power failure
and instantaneous power failure
4
PARAMETERS
(4) Original operation continuation at instantaneous power failure function (Pr. 261 = "2, 12")
(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.
(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.
⋅ 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")
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.
During deceleration at
occurrence of power failure
During stop at
occurrence of
power failure
STF
Y46
Time
Turn OFF STF once to make acceleration again
Power
supply
Output frequency
Pr.261 = 1
REMARKS
⋅ When automatic restart after instantaneous power failure is selected (Pr.
57
≠ "9999"), deceleration to stop function is invalid and the restart after
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.
STF
Power supply
Y46
Not started as inverter
is stopped due to power
failure
ON
OFF
ON
Output
frequency
Time
ON
IPF
Power
supply
Time
Output
frequency
Y46
During deceleration
at occurrence of
power failure
Reacceleration*
When power is restored during
deceleration at occurrence of
power failure
* Acceleration time depends on Pr. 7 (Pr. 44 ).
Pr. 261 = 2
During power failure
Power
supply
Output
frequency
Y46
During deceleration
at occurrence of
power failure
Automatic restart
after instantaneous
power failure
Reset time + Pr.57
Pr.261 = 2, Pr.57 9999
When used with automatic restart
after instantaneous power failure
Time