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Operation selection at power failure and
instantaneous power failure
4.13.2 Automatic restart after instantaneous power failure/flying start under IPM
motor control (Pr. 57, Pr. 162, Pr. 611)
<IPM >
(2) Connection (CS signal)
When the automatic restart after instantaneous power failure selection signal (CS) is turned on, automatic restart
operation is enabled.
When Pr. 57 is set to other than "9999" (automatic restart operation enabled), the inverter will not operate if used with
the CS signal off.
You can restart the inverter without stopping the motor in the following cases:
When power comes back ON after an instantaneous power failure
When motor is coasting at start
Parameter
Number
Name Initial Value Setting Range Description
57
Restart coasting time 9999
0 No waiting time
55K or lower 0.1 to 5s
Set the waiting time for inverter-
triggered restart after an
instantaneous power failure.
75K or higher 0.1 to 30s
9999 No restart
162
Automatic restart after
instantaneous power failure
selection
0
0, 1 Frequency search at an initial start
10, 11 Frequency search at every start
611
Acceleration time at a restart
55K or
lower
5s
0 to 3600s, 9999
Set the acceleration time that takes
to reach Pr.20 Acceleration/
deceleration reference frequency setting
at a restart.
When "9999" is set, standard
acceleration time (like Pr.7) is applied
at restart.
75K or
higher
15s
The above parameters can be set when Pr. 160 User group read selection = "0". (Refer to page 201)
(1) Automatic restart after instantaneous power failure
operation
When instantaneous power failure protection (E.IPF) is activated, the
inverter output is shut off. (Refer to page 316 for E.IPF)
When automatic restart after instantaneous power failure operation is set,
the motor can be restarted if power is restored after an instantaneous power
failure. (E.IPF is not activated.)
When E.IPF is activated, instantaneous power failure signal (IPF) is output.
The IPF signal is assigned to the terminal IPF in the initial setting. The IPF
signal can also be assigned to the other terminal by setting "2 (positive logic)
or 102 (negative logic)" to any of Pr. 190 to Pr. 196 (output terminal function
selection).
CAUTION
The CS signal can be assigned to the input terminal using any of Pr. 178 to Pr. 189 (Input terminal function selection). Changing
the terminal assignment may affect the other functions. Set parameters after confirming the function of each terminal.
When automatic restart operation is selected, instantaneous power failure occurrence (E.IPF) among the alarm output
signals will not be provided at occurrence of an instantaneous power failure.
The SU and FU signals are not output during a restart. They are output after the restart cushion time has elapsed.
Automatic restart operation will also be performed after a reset or when a retry is made by the retry function.
IPM
IPM
IPM
ON
Power
supply
OFF
15ms to 100ms
ONIPF
OFF