(A) Application parameters
528
PARAMETERS
5.14.13 Automatic restart after instantaneous power
failure/flying start with an induction motor
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
POINTPOINT
• 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.
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
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
Magnetic flux
Magnetic flux
Sensorless
Sensorless
Vector
Vector
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