4.2.22 Automatic restart after instantaneous power failure
(Pr. 57, Pr. 58)
Pr. 57 "coasting tim e for autom atic restart after instantaneous pow er failure"
Pr. 58 "cushion tim e for autom atic restart after instantaneous pow er failure"
y You can restart the inverter without stopping the motor (with the motor coasting)
when power is restored after an instantaneous power failure.
Refer to the following table and set the parameters:
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-A024/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 seconds, 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.
When automatic restart after instantaneous power failure has been
selected, the motor and machine will start suddenly (after the reset time
has elapsed) after occurrence of an instantaneous power failure.
Stay away from the motor and machine.
When you have selected automatic restart after instantaneous power
failure, apply the supplied CAUTION seals in easily visible places.
When the start signal is turned off or the
cushion time for automatic restart after instantaneous power failure,
deceleration starts after the automatic restart cushion time set in Pr. 58
"cushion time for automatic restart after instantaneous power failure"
0.1K to 1.5K
0.5 s coasting time
2.2K to 7.5K
1.0 s coasting time
Waiting time for inverter-triggered restart after power is restored
from an instantaneous power failure. (Set this time between 0.1
0.1 to 5 s
second and 5 seconds according to the inertia moment (GD
and torque of the load.)
Normally the inverter may be run with the factory settings. These
0 to 60 s
values are adjustable to the load (inertia moment, torque).
0 to 5 s, 9999
0 to 60 s
Generally use this setting.
key is pressed during the
9999: No restart