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Operation selection at power failure
and instantaneous power failure
4.17 Operation selection at power failure and instantaneous
power failure
4.17.1 Automatic restart after instantaneous power failure/flying start
(Pr. 57, Pr. 58, Pr. 162 to Pr. 165, Pr. 299, Pr. 611)
Purpose Parameter that must 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. 57, Pr. 58, Pr. 162 to Pr. 165,
Pr. 299, Pr. 611
266
When undervoltage or a power
failure occurs, the inverter can be
decelerated to a stop.
Power failure-time
deceleration-to-stop
function
Pr. 261 to Pr. 266, Pr. 294 270
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
Number
Name Initial Value Setting Range Description
57
Restart coasting
time
9999
0
⋅ 1.5K or lower .................................................... 0.5s,
⋅ 2.2K to 7.5K
.................................................1s,
⋅ 11K to 55K
...................................................3.0s,
⋅ 75K or higher.................................................... 5.0s,
The above times are coasting time.
55K or
lower
0.1 to
5s
Set the waiting time for inverter-triggered restart after
an instantaneous power failure.
75K or
higher
0.1 to
30s
9999 No restart
58
Restart cushion
time
1s 0 to 60s Set a voltage starting time at restart.
162
Automatic restart
after
instantaneous
power failure
selection
0
0 With frequency search
1 Without frequency search (reduced voltage system)
2 Encoder detection frequency search
10 Frequency search at every start
11 Reduced voltage system at every start
12 Encoder detection frequency search at every start
163
First cushion time
for restart
0s 0 to 20s
Set a voltage starting time at restart.
Consider using these parameters according to the load
(moment of inertia, torque) magnitude.
164
First cushion
voltage for restart
0% 0 to 100%
165
Stall prevention
operation level for
restart
150% 0 to 220%
Consider the rated inverter current as 100% and set the
stall prevention operation level during restart operation.
299
Rotation direction
detection
selection at
restarting
0
0
Without rotation direction detection
1
With rotation direction detection
9999
When Pr. 78 = "0", the rotation direction is detected.
When Pr. 78 = "1","2", the rotation direction is not detected.
611
Acceleration time
at a restart
55K
or lower
5s
0 to 3600s, 9999
Set the acceleration time that takes to reach Pr. 20
Acceleration/deceleration reference frequency setting at a
restart.
Acceleration time for restart is the normal acceleration
time (e.g. Pr. 7 ) when "9999" is set.
75K
or higher
15s