Flying Start With An Induction Motor - Mitsubishi Electric FR-A820-00046 Instruction Manual

(A) Application parameters
5.14.13 Automatic restart after instantaneous power failure/flying start with an
induction motor
The inverter can be restarted without stopping the motor in the following conditions:
– when switching from commercial power supply operation over to inverter running,
– when an instantaneous power failure occurs during inverter running,
– when the motor is coasting at start.
Pr.
162
A700
299
A701
57
A702
58
A703
163
A704
164
A705
165
A710
611
F003
The coasting time when Pr. 57 = "0" is as shown below. (When Pr. 162, Pr. 570 are set to the initial
value.)
FR-A820-00105(1.5K) or lower and FR-A840-00052(1.5K) or lower: . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5 s
FR-A820-00167(2.2K) to FR-A820-00490(7.5K) and
FR-A840-00083(2.2K) to FR-A840-00250(7.5K): . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 s
FR-A820-00630(11K) to FR-A820-03160(55K), FR-A840-00310(11K) to FR-A840-01800(55K): . 3.0 s
FR-A820-03800(75K) or higher and FR-A840-02160(75K) or higher: . . . . . . . . . . . . . . . . . . . . . . . . . 5.0 s
5 - 562
V/F V/F V/F Magnetic flux Magnetic flux Magnetic flux Sensorless
Name
Automatic restart after
instantaneous power
failure selection
Rotation direction
detection selection at
restarting
Restart coasting time
Restart cushion time
First cushion time for
restart
First cushion voltage for
restart
Stall prevention operation
level for restart
Acceleration time at a
restart
Sensorless Vector Sensorless Vector Vector
Initial Setting
Description
value range
0 Frequency search only performed at the first start
Reduced voltage start only at the first start
1
(no frequency search)
2 Encoder detection frequency search
Frequency search only performed at the first start
3
(reduced impact restart)
0
10 Frequency search at every start
Reduced voltage start at every start (no frequency
11
search)
12 Encoder detection frequency search at every start
Frequency search at every start (reduced impact
13
restart)
0 Without rotation direction
1 With rotation direction
0
When Pr. 78 ="0", with rotation direction
9999
When Pr. 78 ="1, 2" without rotation direction
Coasting time differs according to the inverter
0
capacity.
Set the waiting time for the inverter to perform a
9999
0.1 to 30 s restart at power restoration after an instantaneous
power failure.
9999 No restart
1 s 0 to 60 s Set the voltage cushion time for restart.
0 s 0 to 20 s
Set the voltage cushion time for restart.
Consider this matched to the size of the load (moment
of inertia/torque)
0% 0 to 100%
Set the stall prevention operation level at a restart
150% 0 to 400% operation on the assumption that the inverter rated
current is 100%.
Set the acceleration time that takes to reach Pr. 20
0 to 3600 s "Acceleration/deceleration reference frequency"
setting at a restart.
9999
Standard acceleration time (for example, Pr. 7) is
9999
applied as the acceleration time at restart.
Parameters