448
5. PARAMETERS
5.11 (A) Application parameters
5.11.12 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
*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.
Pr. Name Initial value Setting
range
Description
162
A700
Automatic restart after
instantaneous power failure
selection
0
0 (2)
*2
, 1000
(1002)
*2
Frequency search only performed at the first start
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)
10 (12)
*2
,
1010 (1012)
*2
Frequency search at every start
11, 1011 Reduced voltage start at every start (no frequency search)
13, 1013 Frequency search at every start (reduced impact restart)
299
A701
Rotation direction detection
selection at restarting
9999 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.
*1
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
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
110% 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.
Magnetic fluxMagnetic fluxMagnetic flux
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