Automatic Restart After Instantaneous Power Failure/Flying Start With An Induction Motor - Mitsubishi Electric 800 Series Instruction Manual

5.14.14
Automatic restart after instantaneous power
failure/flying start with an induction motor
V/F V/F V/F
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. Name
Automatic restart after
162
instantaneous power
A700
failure selection
Rotation direction
299
detection selection at
A701
restarting
57
Restart coasting time
A702
58
Restart cushion time
A703
163 First cushion time for
A704 restart
164 First cushion voltage for
A705 restart
165 Stall prevention
A710 operation level for restart
611 Acceleration time at a
F003 restart

The coasting time when Pr.57 = "0" is as shown below. (When Pr.162, Pr.570 are set to the initial value.)
FR-A860-00027: 0.5 s
FR-A860-00061 to FR-A860-00170: 1 s
FR-A860-00320 to FR-A860-01080: 3.0 s
FR-A860-01440 or higher: 5.0 s
POINT POINT
• To operate the inverter with the automatic restart after instantaneous power failure function enabled, check the following
points.
• Set Pr.57 Restart coasting time = "0".
• Turn the terminal CS (Selection of automatic restart after instantaneous power failure, flying start) ON.
• When the Selection of automatic restart after instantaneous power failure / flying start (CS) signal is assigned to the input
terminal, restart operation is enabled at turn-ON of the CS signal.
Magnetic flux Magnetic flux Sensorless Magnetic flux Sensorless Vector Sensorless Vector Vector
Initial
value
0, 1000
1, 1001
2, 1002
3, 1003
0
10, 1010
11, 1011
12, 1012
13, 1013
0
1
0
9999
0
9999 0.1 to 30 s
9999
1 s 0 to 60 s
0 s 0 to 20 s
0% 0 to 100%
150% 0 to 400%
0 to 3600 s
9999
9999
Setting
range
Frequency search only performed at the first start
Reduced voltage start only at the first start
(no frequency search)
Encoder detection frequency search
Frequency search only performed at the first start (reduced
impact restart)
Frequency search at every start
Reduced voltage start at every start (no frequency search)
Encoder detection frequency search at every start
Frequency search at every start (reduced impact restart)
Without rotation direction
With rotation direction
When Pr.78 ="0", with rotation direction
When Pr.78 ="1, 2" without rotation direction
Coasting time differs according to the inverter capacity.
Set the time delay for the inverter to perform a restart after
restoring power due to an instantaneous power failure.
No restart
Set the voltage cushion time for restart.
Set the voltage cushion time for restart.
Consider this matched to the size of the load (moment of
inertia/torque)
Set the stall prevention operation level at a restart operation
on the assumption that the inverter rated current is 100%.
Set the acceleration time that takes to reach Pr.20
Acceleration/deceleration reference frequency setting at a
restart.
Standard acceleration time (for example, Pr.7) is applied as
the acceleration time at restart.
(A) Application parameters
Description

PARAMETERS
5
GROUP
A
515