Operation Selection At Power Failure And Instantaneous Power Failure; Automatic Restart After Instantaneous Power Failure/Flying Start (Pr. 57, Pr. 58, Pr. 162 To Pr. 165, Pr. 299, Pr. 611); Automatic Restart After Instantaneous Power Failure/Flying Start; (Pr. 57, Pr. 58, Pr. 162 To Pr. 165, Pr. 299, Pr. 611) - Mitsubishi Electric FR-A720-0.4K Instruction Manual

4.17 Operation selection at power failure and instantaneous
power failure
Purpose
At instantaneous power failure
occurrence, restart inverter without
stopping motor
When undervoltage or a power
failure occurs, the inverter can be
decelerated to a stop.

4.17.1 Automatic restart after instantaneous power failure/flying start

(Pr. 57, Pr. 58, Pr. 162 to Pr. 165, Pr. 299, Pr. 611)

You can restart the inverter without stopping the motor in the following cases.
⋅ when commercial power supply operation is switched to inverter operation
⋅ when power comes back on after an instantaneous power failure
⋅ when motor is coasting at start
Parameter
Name
Number
Restart coasting
57
time
Restart cushion
58
time
Automatic restart
after
162 instantaneous
power failure
selection
First cushion time
163
for restart
First cushion
164
voltage for restart
Stall prevention
165 operation level for
restart
Rotation direction
detection
299
selection at
restarting
Acceleration time
611
at a restart
Parameter that must be Set
Automatic restart operation
after instantaneous power
failure/flying start
Power failure-time
deceleration-to-stop
function
Initial Value Setting Range
0
9999
0.1 to
55K or
less
0.1 to
75K or
more
9999
1s 0 to 60s
0
1
2
0
10
11
12
0s 0 to 20s
0% 0 to 100%
150% 0 to 220%
0
1
0
9999
55K
5s
or less
0 to 3600s, 9999
75K
15s
or more
Operation selection at power failure
and instantaneous power failure
Pr. 57, Pr. 58, Pr. 162 to Pr. 165,
Pr. 299, Pr. 611
Pr. 261 to Pr. 266, Pr. 294
Description
⋅ 1.5K or less....................................................... 0.5s,
⋅ 2.2K to 7.5K .................................................
⋅ 11K to 55K ...................................................
⋅ 75K or more...................................................... 5.0s,
The above times are coasting time.
5s
Set the waiting time for inverter-triggered restart after
an instantaneous power failure.
30s
No restart
Set a voltage starting time at restart.
With frequency search
Without frequency search (reduced voltage system)
Encoder detection frequency search
Frequency search at every start
Reduced voltage system at every start
Encoder detection frequency search at every start
Set a voltage starting time at restart.
Consider using these parameters according to the load
(moment of inertia, torque) magnitude.
Consider the rated inverter current as 100% and set the
stall prevention operation level during restart operation.
Without rotation direction detection
With rotation direction detection
When Pr. 78 = "0", the rotation direction is detected.
When Pr. 78 = "1","2", the rotation direction is not detected.
Set the acceleration time to reach the set frequency at
a restart.
Acceleration time for restart is the normal acceleration
time (e.g. Pr. 7 ) when "9999" is set.
Refer to Page
255
259
1s,
3.0s,
4
255