Mitsubishi Electric FR-A700 Technical Manual page 341

(4) Operation continuation
instantaneous power failure [Pr. 261 = 2,
12 * ]
(*not available for
When power is restored during deceleration after a
power failure, acceleration is made again up to the
set frequency.
When power is restored during
[Pr. 261 = 2]
deceleration at occurrence of
power failure
Power
supply
Output
frequency
During deceleration
at occurrence of
power failure
Y46
* Acceleration time follows the [Pr. 7] ([Pr. 44]) setting.
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"]
Keep start signal
instantaneous power failure when using operation
continuation function at instantaneous power failure.
When start signal turns OFF during instantaneous
power failure, the inverter decelerates by the
deceleration time setting. If regeneration energy is
insufficient, the motor coasts.
[Pr.261 = 2], [Pr.57 9999]
During power failure
Power
supply
Output
frequency
During deceleration
at occurrence of
power failure
Y46
(5) Undervoltage avoidance function [Pr. 261
= 11, 12, Pr. 294]
A700
When [Pr. 261 = 11, 12], the deceleration time is
automatically adjusted
undervoltage from occurring during deceleration at
an instantaneous power failure.
Adjust the slope of frequency decrease and response
level with [Pr. 294].
responsiveness to the bus voltage. Since the
function at
)
F700 E700 D700
IPF
Re-acceleration*
Time
(STF/STR) ON during
When used with automatic restart
after instantaneous power failure
Automatic restart
after instantaneous
power failure
Time
Reset time + [Pr.57]
(shortened) to prevent
A larger setting will improve
regeneration amount is large when the inertia is
large, decrease the setting value.
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 [Pr. 261 = 1 (2)].
(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).
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.
375
PARAMETER
2