Mitsubishi Electric FR-D720S SC EC, Instruction Manual

Page: 276 / 512

Operation selection at power failure Parameter
6 - 126
●
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.
The output shut off timing differs according to the load condition.
Pr. 299 Setting
Pr. 78 Setting
0 1 2
9999
With rotation
direction detection
Without rotation
direction detection
Without rotation
direction detection
0
(Initial value)
Without rotation
direction detection
Without rotation
direction detection
Without rotation
direction detection
1
With rotation
direction detection
With rotation
direction detection
With rotation
direction detection
Tab. 6-23: Rotation direction direction
Fig. 6-69:
Automatic restart with frequency search
(Pr. 162 = 0/10)
I000722C
Power
supply
(L1, L2, L3)
Motor
speed
[r/min]
Output
frequency
[Hz]
Output
voltage
[V]
Power failure
Coasting time +
speed detection time
Pr. 57
Restart cushion
time Pr. 58
Acceleration time Pr. 611