Mitsubishi Electric FR-A800, Instruction Manual

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(A) Application parameters Parameters
5 - 584
Continuous operation function at instantaneous power failure (Pr. 261 = "2, 12, 22")
●
The motor re-accelerates to the set frequency if the power restores during the deceleration to stop.
●
Combining with the automatic restart after instantaneous power failure function enables a power
failure time deceleration stop and re-acceleration at a power restoration.
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.
Undervoltage avoidance function (Pr. 261 = "11, 12", Pr. 294)
●
If "11, 12" is set to Pr. 261, the deceleration time is adjusted (shortened) to prevent an undervoltage
from occurring during deceleration at occurrence of power failure.
●
Adjust the downward frequency slope and the response level using Pr. 294 "UV avoidance voltage
gain". Setting a large value improves the response to the bus voltage.
I002720E
Fig. 5-293: Operation continuation at instantaneous power failure
NOTE The undervoltage avoidance function is invalid under torque control by Real sensorless vector
control. When "11 (12)" is set to Pr. 261, operation is the same as when "1 (2) is set to Pr. 261.
IPF
Y46
Y46
When power is restored during
deceleration at occurrence of power failure
Pr. 261 = 2
Power
supply
Output
frequency
During deceleration
at occurrence of
power failure
Reacceleration *
Time
* Acceleration time depends on Pr. 7 (Pr. 44 ).
Power
supply
During deceleration
at occurrence of
power failure
Output
frequency
During power failure
Pr. 261 = 2, Pr. 57
≠
9999
When used with automatic restart
after instantaneous power failure
Automatic restart
after instantaneous
power failure
Time