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Operation selection at power failure and instantaneous power failure
5.15 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.
5.15.1 Automatic restart after instantaneous power failure/flying start
(Pr. 57, Pr. 58, Pr. 96, Pr. 162, Pr. 165, Pr. 298, Pr. 299, Pr. 611)
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
Name
Number
Restart coasting time
57
58
Restart cushion time
96
Auto tuning setting/status
Automatic restart after
162
instantaneous power
failure selection
Stall prevention
165
operation level for restart
298
Frequency search gain
Rotation direction
299
detection selection at
restarting
Acceleration time at a
611
restart
The above parameters can be set when Pr. 160 User group read selection = "0". (Refer to page 197)
180
Parameter that should be Set
Automatic restart operation
after instantaneous power
failure/flying start
Power failure-time
deceleration-to-stop
function
Setting
Initial Value
Range
1.5K or lower ... 1s
2.2K to 7.5K .... 2s
0
11K or higher... 3s
9999
The above times are coasting time.
Waiting time for inverter-triggered restart after an instantaneous
0.1 to 5s
power failure.
9999
No restart
1s
0 to 60s
Voltage starting time at restart.
0
Offline auto tuning is not performed
Advanced magnetic flux vector control
1
Offline auto tuning is performed without motor running (all motor
constants) (Refer to page 114)
For General-purpose magnetic flux vector control
0
11
Offline auto tuning is performed without motor running (motor
constants (R1) only) (Refer to page 117)
Offline auto tuning (tuning performed without motor running) for
21
V/F control and automatic restart after instantaneous power
failure (with frequency search)
0
With frequency search
1
Without frequency search (reduced voltage system)
1
10
Frequency search at every start
11
Reduced voltage at every start
Considers the rated inverter current as 100% and sets the stall
150%
0 to 200%
prevention operation level during restart operation.
When offline auto tuning is performed under V/F control,
frequency search gain necessary for frequency search for
0 to 32767
automatic restart after instantaneous power failure is set as well
9999
as the motor constants (R1).
Uses the Mitsubishi motor (SF-JR, SF-HR, SF-JRCA, SF-HRCA)
9999
constants
0
Without rotation direction detection
1
With rotation direction detection
When Pr. 78 = 0,
0
With rotation direction detection
9999
When Pr. 78 = 1, 2
Without rotation direction detection
Acceleration time to reach Pr. 20 Acceleration/deceleration reference
0 to 3600s
frequency at a restart.
9999
Acceleration time for restart is the normal acceleration time (e.g.
9999
Pr. 7)
Pr. 57, Pr. 58, Pr. 96,
Pr. 162, Pr. 165, Pr. 298, Pr. 299,
Pr. 611
Pr. 261
Description
Refer to Page
180
186
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