Automatic restart after instantaneous power failure/flying start with an IPM
When using the IPM motor MM-CF, the inverter operation can be restarted without stopping the mo-
When the automatic restart after instantaneous power failure function is selected, the motor driving
is resumed in the following situations:
– When power comes back ON during inverter driving after an instantaneous power failure
– When the motor is coasting at start
Automatic restart after instantaneous power failure function
● The inverter output is shut off at the activation of the instantaneous power failure protection
(E.IPF) or undervoltage protection (E.UVT). (Refer to page page 6-9 for E.IPF or E.UVT.)
● When E.IPF or E.UVT is activated, the instantaneous power failure/undervoltage (IPF) signal is
● The IPF signal is assigned to terminal IPF in the initial status. By setting "2 (positive logic) or 102
(negative logic)" in any of Pr. 190 to Pr. 196 (output terminal function selection), the IPF signal can
be assigned to another terminal.
● When the automatic restart after instantaneous power failure function is selected, motor driving
is resumed at the power restoration after an instantaneous power failure or undervoltage. (E.IPF
and E.UVT are not activated.)
* 10 to 100 ms for IP55 compatible models
Connection (CS signal)
● Restart is enabled at turn-ON of the automatic restart after instantaneous power failure/flying
start (CS) signal.
● The inverter operation is disabled at turn-OFF of the CS signal while Pr. 57 "Restart coasting time"
≠"9999" (with restart).
Restart coasting time
Automatic restart after
Acceleration time at a
15 ms to 100 ms*
No coasting time
Set the waiting time for the inverter to perform a
0.1 to 30 s
restart after restoring power due to an instantaneous
0, 1, 2, 3
Frequency search only performed at the first start
10, 11, 12,
Frequency search at every start
Set the acceleration time to reach Pr. 20 "Acceleration/
0 to 3600 s
deceleration reference frequency" at restart.
Standard acceleration time (for example, Pr. 7) is
applied as the acceleration time at restart.
(A) Application parameters
5 - 571