Mitsubishi Electric FR-A700 EC, Instruction Manual

Page: 522 / 826

Operation selection at power failure Parameter
6 - 342
●
Without frequency search
When Pr. 162 = "1" or "11", automatic restart operation is performed in a reduced voltage
system, where the voltage is gradually risen with the output frequency unchanged from prior
to an instantaneous power failure independently of the coasting speed of the motor.
For real sensorless vector control, output frequency and voltage before instantaneous power
prior to an instantaneous power failure independently of the coasting speed of the motor.
Automatic restart without frequency search (Pr. 162 = 1/11)
The output shut off timing differs according to the load condition.
The output shut off timing differs according to the load condition.
Fig. 6-159:
Under V/f control or advanced magnetic flux
vector control
I000647C
Abb. 6-160:
Under real sensorless vector control
I001604E
NOTE This system stores the output frequency prior to an instantaneous power failure and incre-
ases the voltage. Therefore, if the instantaneous power failure time exceeds 0.2s, the inver-
ter starts at Pr. 13 "Starting frequency" (initial value = 0.5Hz) since the stored output
frequency cannot be retained.
Power
supply
(L1, L2, L3)
Motor
speed
[r/min]
Output
frequency
[Hz]
Output
voltage
[V]
Power failure
Coasting time
Pr. 57 Restart
cushion time
Pr. 58
Power
supply
(L1, L2, L3)
Motor
speed
[r/min]
Output
frequency [Hz]/
Output
voltage [V]
Power failure
Coasting time
Pr. 57