Mitsubishi Electric FR-D720S SC EC Instruction Manual page 276

Operation selection at power failure
● With frequency search
When "0 (initial value) or 10" is set in Pr. 162, the inverter smoothly starts after detecting
the motor speed upon power restoration. (The motor capacity should be equal to or one
rank lower than the inverter capacity.)
When using the frequency search, perform offline autotuning. (Refer to page 6-74 for
general-purpose magnetic flux vector control and page 6-129 for V/f control.)
During reverse rotation, the inverter can be restarted smoothly as the direction of rotation
is detected. You can select whether to make rotation direction detection or not with Pr. 299
"Rotation direction detection selection at restarting". When capacities of the motor and
inverter differ, set "0" (without rotation direction detection) in Pr. 299.
Pr. 299 Setting
9999
(Initial value)
Tab. 6-23: Rotation direction direction
Power
supply
(L1, L2, L3)
Motor
speed
[r/min]
Output
frequency
Output
voltage
speed detection time
The output shut off timing differs according to the load condition.
6 - 126
0
With rotation
direction detection
0 Without rotation
direction detection
With rotation
1
direction detection
Power failure
[Hz]
[V]
Restart cushion
Coasting time + time Pr. 58
Pr. 57
Acceleration time Pr. 611
Pr. 78 Setting
1
Without rotation
direction detection
Without rotation
direction detection
With rotation
direction detection
Fig. 6-69:
Automatic restart with frequency search
(Pr. 162 = 0/10)
Parameter
2
Without rotation
direction detection
Without rotation
direction detection
With rotation
direction detection
I000722C