(A) Application parameters
534
PARAMETERS
5.14.14 Automatic restart after instantaneous power
failure/flying start with an IPM motor
Automatic restart after instantaneous power failure function
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).
NOTE
• The CS signal is assigned to the CS terminal in the initial status.By setting "6" in any of Pr.178 to Pr.189 (input terminal
function selection), the signal can be assigned to another terminal. Changing the terminal assignment may affect other
functions. Set parameters after confirming the function of each terminal.
• If the CS signal is not assigned to any input terminal, solely setting Pr.57 will enable the restart operation at all times.
• If the restart operation is selected, instantaneous power failure protection (E.IPF) is disabled while the fault output signal is
output at an instantaneous power failure.
• The SU and FU signals are not output during the restart. These signals are output after the restart cushion time passes.
• Restart operation is also performed after the inverter reset is released or after the retry by the retry function occurs.
• The automatic restart after instantaneous power failure function is invalid when the load torque high-speed frequency control
(Pr.270 = "2, 3, 13") is set.
When using the IPM motor MM-CF, the inverter operation can be restarted without stopping the motor operation.
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
Pr. Name
Initial
value
Setting
range
Description
57
A702
Restart coasting time
9999
0 No coasting time
0.1 to 30 s
Set the waiting time for the inverter to perform a restart after
restoring power due to an instantaneous power failure.
9999 No restart
162
A700
Automatic restart after
instantaneous power
failure selection
0
0, 1, 2, 3 Frequency search only performed at the first start
10, 11, 12,
13
Frequency search at every start
611
F003
Acceleration time at a
restart
9999
0 to 3600 s
Set the acceleration time to reach Pr.20 Acceleration/
deceleration reference frequency at restart.
9999
Standard acceleration time (for example, Pr.7) is applied as
the acceleration time at restart.
• 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 645 for E.IPF or E.UVT.)
• When E.IPF or E.UVT is activated, the instantaneous power failure/
undervoltage (IPF) signal is output.
• 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.)
PM
PM
ON
Power
supply
OFF
15 to 100ms
ONIPF
OFF
∗1
∗1 10 to 100 ms for IP55 compatible models
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