Mitsubishi Electric FR-A740-00023 Instruction Manual page 265

15ms to 100ms
Power
ON
OFF
supply
IPF
OFF
MCCB MC1
R/L1 U
S/L2 V
T/L3 W
R1/L11
S1/L21
STF
CS
PC
CS
PC
When Pr. 162 = 0, 10 (with frequency search)
V/F control, advanced magnetic flux vector control
Instaneous (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)
Speed
Coasting detection
+
time (Pr.57) time
* The output shut off timing differs
according to the load condition.
Real sensorless vector control
Instaneous (power failure) time
Power supply
(R/L1, S/L2,
T/L3)
Motor speed N
(r/min)
Inverter output
frequency f(Hz)
*
output voltage
E(V)
Speed
Coasting
detection
+
time (Pr.57)
time
* The output shut off timing differs
according to the load condition.
(1) Automatic restart after instantaneous power failure operation
⋅ When instantaneous power failure protection (E.IPF) and undervotage
protection (E.UVT) are activated, the inverter output is shut off. (Refer to
page 400 for E.IPF and E.UVT.)
When automatic restart after instantaneous power failure operation is set,
ON
the motor can be restarted if power is restored after an instantaneous
power failure or undervoltage is corrected. (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)" to any of Pr. 190 to Pr. 196 (output terminal
function selection).
(2) Connection (CS signal)
MC2
⋅ When the automatic restart after instantaneous power failure
MC3
⋅ When Pr. 57 is set to other than "9999" (automatic restart
IM
MC
switchover
sequence
For use for only
automatic restart
after instantaneous
power failure or flying start,
short CS-PC in advance.
(3) Automatic restart operation selection (Pr. 162, Pr.
⋅ During reverse rotation, the inverter can be restarted smoothly
⋅ You can select whether to make rotation direction detection or
Restart cushion
time (Pr.58 setting)
Acceleration time
at a restart
(Pr.611 setting)
Acceleration time
at a restart
(Pr.611 setting)
Operation selection at power failure
and instantaneous power failure
selection signal (CS) is turned on, automatic restart operation
is enabled.
operation enabled), the inverter will not operate if used with the
CS signal remained off.
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.
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.
as the direction of rotation is detected.
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.
Pr. 299 Setting
9999
0 (initial value)
1
:with rotation direction detection
×
: without rotation direction detection
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
(OCT) alarm.
⋅ If two or more motors are connected to one inverter, the inverter
functions abnormally. (The inverter does not start smoothly.)
⋅ Since the DC injection brake is operated instantaneously when
the speed is detected at a restart, the speed may reduce if the
inertia moment (J) 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.
Pr. 78 Setting
0 1 2
× ×
× × ×
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