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153
Operation selection at power failure
and instantaneous power failure
4
PARAMETERS
(1) Automatic restart after instantaneous power failure operation
⋅ When Instantaneous power failure protection (E.IPF) and undervoltage
protection (E.UVT) are activated, the inverter output is shut off. (Refer to
page 340 for E.IPF and E.UVT.)
When automatic restart after instantaneous power failure operation is set,
the motor can be restarted if power is restored after an instantaneous
power failure and under voltage. (E.IPF and E.UVT are not activated.)
⋅ When E.IPF and E.UVT are activated, instantaneous power failure/under
voltage 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)" in any of Pr. 190 to Pr. 196 (output terminal
function selection).
(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 remained OFF.
(3) Automatic restart operation selection
(Pr. 162, Pr. 299)
With frequency search
When "0 (initial value), 10" is set in Pr. 162, the inverter
smoothly starts after detecting the motor speed upon power
restoration.
⋅ During reverse rotation, the inverter can be restarted smoothly
as the direction of rotation is detected.
⋅ You can select whether to make rotation direction detection or
not with Pr. 299 "Rotation direction detection selection at restarting".
When capacities of the motor and inverter differ, set "0" (without
rotation direction detection) in Pr. 299.
ON
Power
supply
OFF
15ms to 100ms
ONIPF
OFF
STF
IM
MCCB
CS
CS
S1/L21
R1/L11
T/L3
S/L2
R/L1
MC1
MC2
MC3
W
V
U
MC
switchover
sequence
SD
SD
For use for only
automatic restart
after instantaneous
power failure or flying start,
short CS and SD in advance.
REMARKS
⋅ The CS signal is assigned to the terminal CS in the initial setting. By
setting "6" in any of Pr. 178 to Pr. 189 (input terminal function selection),
you can assign the CS signal to the other terminal.
Instantaneous (power failure) time
Power supply
(R/L1,S/L2,T/L3)
Motor
speed N (r/min)
Inverter
output frequency
f (Hz)
Inverter
output voltage
E (V)
Coasting
time (Pr.57)
Speed
detection time
+
Acceleration time
at a restart
(Pr. 611 setting)
Restart cushion
time (Pr. 58 setting)
* The output shut off timing differs according
to the load condition.
*
When Pr. 162 = 0, 10 (with frequency search)
: with rotation direction detection
× : with rotation direction detection
Pr.299 Setting
Pr.78 Setting
0 1 2
9999 (initial value) ××
0 ×××
1
REMARKS
⋅ Speed detection time (frequency search) changes according to
the motor speed. (maximum 500ms)
⋅ When the inverter capacity is two rank or more larger than the
motor capacity, the inverter may not start due to overcurrent
trip (E.OC).
⋅ If two or more motors are connected to one inverter, the
inverter functions abnormally. (Inverter does not start properly.)
⋅ Since the DC injection brake is operated instantaneously when
the speed is detected at a restart, the speed may reduce if the
moment of inertia of the load is small.
⋅ When reverse rotation is detected when Pr. 78=
"1" (reverse
rotation disabled), the rotation direction is changed to forward
rotation after decelerates in reverse rotation when the start
command is forward rotation. The inverter will not start when
the start command is reverse rotation.