Mitsubishi Electric 800 Series Instruction Manual page 449

5.11.12 Automatic restart after instantaneous power failure/flying
start with an induction motor
V/F V/F V/F Magnetic flux Magnetic flux Magnetic flux
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 Automatic restart after
A700 instantaneous power failure
selection
299 Rotation direction detection
A701 selection at restarting
57 Restart coasting time
A702
58 Restart cushion time
A703
163 First cushion time for restart 0 s
A704
164 First cushion voltage for
A705 restart
165 Stall prevention operation
A710 level for restart
611 Acceleration time at a restart 9999
F003
*1 The coasting time when Pr.57 = "0" is as shown below. (When Pr.162, Pr.570 are set to the initial value.)
FR-F860-00027: 0.5 s
FR-F860-00061 and FR-F860-00090: 1.0 s
FR-F860-00170 to 00680: 3.0 s
FR-F860-01080 or higher: 5.0 s
*2 The same operation is performed for the both settings.
448
5. PARAMETERS
5.11 (A) Application parameters
Name Initial value
0
9999
9999
1 s
0%
110%
Setting
range
Frequency search only performed at the first start
*2
0 (2) , 1000
*2
(1002)
1, 1001 Reduced voltage start only at the first start
(no frequency search)
3, 1003 Frequency search only performed at the first start (reduced
impact restart)
Frequency search at every start
*2
10 (12) ,
*2
1010 (1012)
11, 1011 Reduced voltage start at every start (no frequency search)
13, 1013 Frequency search at every start (reduced impact restart)
0 Without rotation direction
1 With rotation direction
9999 When Pr.78 = "0", with rotation direction
When Pr.78 = "1, 2" without rotation direction
0
Coasting time differs according to the inverter capacity.
0.1 to 30 s Set the time delay for the inverter to perform a restart after
restoring power due to an instantaneous power failure.
9999 No restart
0 to 60 s Set the voltage cushion time for restart.
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 to 100%
0 to 400% Set the stall prevention operation level at a restart operation on
the assumption that the inverter rated current is 100%.
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.
Description
*1