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Operation selection at power failure and instantaneous power failure
4.12 Operation selection at power failure and instantaneous power
failure
4.12.1 Automatic restart after instantaneous power failure/flying start
(Pr. 30, Pr. 57, Pr. 58, Pr. 96, Pr. 162, Pr. 165, Pr. 298, Pr. 299, Pr. 611)
Purpose Parameter that should be Set Refer to Page
At instantaneous power failure
occurrence, restart inverter without
stopping motor
Automatic restart operation
after instantaneous power
failure/flying start
Pr. 30, Pr. 57, Pr. 58, Pr. 96,
Pr. 162, Pr. 165, Pr. 298, Pr. 299,
Pr. 611
136
When undervoltage or a power
failure occurs, the inverter can be
decelerated to a stop.
Power failure-time
deceleration-to-stop
function
Pr. 261
142
You can restart the inverter without stopping the motor in the following cases:
When power comes back on after an instantaneous power failure
When motor is coasting at start
Parameter
Number
Name Initial Value
Setting Range
Description
30
Regenerative function
selection
0
0, 1
The motor starts at the starting frequency when MRS (X10)
turns on then off
2
Restart operation is performed when MRS (X10) turns on
then off
57
Restart coasting time
9999
0
FR-D720-070 or less, FR-D740-036 or less,
FR-D720S-070 or less.....................................................1s
FR-D720-100 or more, FR-D740-050 or more,
FR-D720S-100 ................................................................2s
The above times are coasting time.
0.1 to 5s
Waiting time for inverter-triggered restart after an
instantaneous power failure.
9999 No restart
58 Restart cushion time
1s 0 to 60s Voltage starting time at restart.
96 Auto tuning setting/status
0
0 Offline auto tuning is not performed
11
For General-purpose magnetic flux vector control
Offline auto tuning is performed without motor running (motor
constants (R1) only) (Refer to page 75)
21
Offline auto tuning (tuning performed without motor running)
for V/F control and automatic restart after instantaneous
power failure (with frequency search)
162
Automatic restart after
instantaneous power
failure selection
1
0 With frequency search
1 Without frequency search (reduced voltage system)
10 Frequency search at every start
11 Reduced voltage at every start
165
Stall prevention operation
level for restart
150% 0 to 200%
Considers the rated inverter current as 100% and sets the
stall prevention operation level during restart operation.
298 Frequency search gain
9999
0 to 32767
When offline auto tuning is performed under V/F control,
frequency search gain necessary for frequency search for
automatic restart after instantaneous power failure is set as
well as the motor constants (R1).
9999
Uses the Mitsubishi motor (SF-JR, SF-HR, SF-JRCA, SF-
HRCA) constants
299
Rotation direction
detection selection at
restarting
0
0 Without rotation direction detection
1 With rotation direction detection
9999
When Pr. 78 = 0,
With rotation direction detection
When Pr. 78 = 1, 2
Without rotation direction detection
611
Acceleration time at a
restart
9999
0 to 3600s
Acceleration time to reach Pr.20 Acceleration/deceleration
reference frequency at a restart.
9999
Acceleration time for restart is the normal acceleration time
(e.g. Pr. 7)
The above parameters can be set when Pr. 160 Extended function display selection = "0". (Refer to page 162)