Mitsubishi Electric FR-A800, Instruction Manual

Page: 742 / 1042

(A) Application parameters Parameters
5 - 562
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.
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
Pr. Name
Initial
value
Setting
range
Description
162
A700
Automatic restart after
instantaneous power
failure selection
0
0 Frequency search only performed at the first start
1
Reduced voltage start only at the first start
(no frequency search)
2 Encoder detection frequency search
3
Frequency search only performed at the first start
(reduced impact restart)
10 Frequency search at every start
11
Reduced voltage start at every start (no frequency
search)
12 Encoder detection frequency search at every start
13
Frequency search at every start (reduced impact
restart)
299
A701
Rotation direction
detection selection at
restarting
0
0 Without rotation direction
1 With rotation direction
9999
When Pr. 78 ="0", with rotation direction
When Pr. 78 ="1, 2" without rotation direction
57
A702
Restart coasting time 9999
0
Coasting time differs according to the inverter
capacity.
0.1 to 30 s
Set the waiting time for the inverter to perform a
restart at power restoration after an instantaneous
power failure.
9999 No restart
58
A703
Restart cushion time 1 s 0 to 60 s Set the voltage cushion time for restart.
163
A704
First 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)
164
A705
First cushion voltage for
restart
0% 0 to 100%
165
A710
Stall prevention operation
level for restart
150% 0 to 400%
Set the stall prevention operation level at a restart
operation on the assumption that the inverter rated
current is 100%.
611
F003
Acceleration time at a
restart
9999
0 to 3600 s
Set the acceleration time that takes to reach Pr. 20
"Acceleration/deceleration reference frequency"
setting at a restart.
9999
Standard acceleration time (for example, Pr. 7) is
applied as the acceleration time at restart.
V/F V/F V/F Magnetic flux Magnetic flux Magnetic flux Sensorless Sensorless Sensorless Vector Vector Vector