PARAMETERS
92
"
"
Automatic restart after instantaneous power failure (Pr. 57, Pr. 58)
4.2.22 Automatic restart after instantaneous power failure
(Pr. 57, Pr. 58)
Pr. 57 "restart coasting time"
Pr. 58 "restart cushion time"
!
You can restart the inverter without stopping the motor (with the motor coasting)
when power is restored after an instantaneous power failure.
Parameter Number
Factory Setting
Setting Range
Remarks
57
9999
0 to 5 s, 9999
9999: No restart
58
1.0 s
0 to 60 s
<Setting>
Refer to the following table and set the parameters:
Parameter
Number
Setting
Description
0.4K to 1.5K
0.5 s coasting time
0
2.2K to 7.5K
1.0 s coasting time
Generally use this setting.
0.1 to 5 s
Waiting time for inverter-triggered restart after power is restored
from an instantaneous power failure. (Set this time between 0.1 s
and 5 s according to the inertia moment (J) and torque of the
load.)
57
9999
No restart
58
0 to 60 s
Normally the inverter may be run with the factory settings. These
values are adjustable to the load (inertia moment, torque).
Instantaneous power
failure (power failure) time
Power supply
(L
1
, L
2
, L
3
)
STF(STR)
Motor speed
(r/min)
Inverter output
frequency
(Hz)
Inverter output
voltage
(V)
Coasting time
Pr. 57 setting
Restart
voltage
rise time
Pr. 58 setting
Note: 1. Automatic restart after instantaneous power failure uses a reduced-voltage
starting system in which the output voltage is raised gradually with the preset
frequency unchanged, independently of the coasting speed of the motor.
As in the FR-A024S/A044, a motor coasting speed detection system (speed
search system) is not used but the output frequency before an instantaneous
power failure is output. Therefore, if the instantaneous power failure time is
longer than 0.2 s, the frequency before the instantaneous power failure
cannot be stored and the inverter will start at 0Hz.
2. The SU and FU signals are not output during restart but are output after the
restart cushion time has elapsed.