Mitsubishi Electric FR-A720-0.4K Specifications Page 46

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49
When setting parameters, refer to the instruction manual (applied) and understand instructions.
You can restart the inverter without stopping the motor in the
following cases:
when commercial power supply operation is switched to inverter
operation
when power comes back on after an instantaneous power failure
when motor is coasting at start
* The setting range depends on the inverter capacity. (55K or less/75K or
more)
When
"
0 (initial value) or 10
"
is set in Pr.162, the inverter smoothly
starts after detecting the motor speed upon power restoration.
The motor starts at the motor speed and in the rotation direction
detected from the encoder at power restoration when "2 or 12" is set
in Pr.162 under encoder feedback control or vector control. (Valid
when the FR-A7AP is fitted)
Even when the motor is rotating in the opposite direction, 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 Pr.162="1" or "11", automatic restart operation is performed in a
reduced voltage system, where the voltage is gradually risen with the
output frequency unchanged from prior to an instantaneous power
failure independently of the coasting speed of the motor.
For real sensorless vector control, output frequency and voltage
before instantaneous power failure are output. (Pr. 58 is made invalid)
Automatic restart operation after instantaneous
power failure/flying start
Pr.57 Restart coasting time
Pr.58 Restart cushion time
Pr.162
Automatic restart after instantaneous power failure selection
Pr.163 First cushion time for restart Pr.164 First cushion voltage for restart
Pr.165 Stall prevention operation level for restart
Pr.299 Rotation direction detection selection at restarting
Pr.611 Acceleration time at a restart
Pr.
Number
Setting Range Description
57
0
1.5K or less..........0.5s,
2.2K to 7.5K.........1s,
11K to 55K ...........3s
75K or more.........5s
The above times are coasting time.
0.1 to 5s/
0.1 to 30s
*
Set the waiting time for inverter-triggered
restart after an instantaneous power
failure.
9999
(initial value)
No restart
58 0 to 60s
Set a voltage starting time at restart.
162
0 (initial value)
With frequency search
1
Without frequency search (reduced
voltage system)
2
Encoder detection frequency
10
Frequency search at every start
11
Reduced voltage system at every start
12
Encoder detection frequency at every start
163 0 to 20s
Set a voltage starting time at restart.
Consider using these parameters
according to the load (moment of inertia/
torque) magnitude.
164 0 to 100%
165 0 to 220%
Consider the rated inverter current as
100% and set the stall prevention
operation level during restart operation.
299
0
Without rotation direction detection
1
With rotation direction detection
9999
When Pr.78=0, the rotation direction is
detected.
When Pr.78=1,2, the rotation direction is
not detected.
611
0 to 3600s
Set the acceleration time to reach the set
frequency at a restart.
9999
Acceleration time for restart is the normal
acceleration time (e.g. Pr.7).
<Connection diagram>
Pr.
57, 58, 162 to 165, 299, 611
P
r.
STF
IM
MCCB
CS
CS
S1/L21
R1/L11
T/L3
S/L2
R/L1
MC1
MC2
MC3
W
V
U
For use for only
automatic restart
after instantaneous
power failure or flying start,
short CS-SD in advance.
MC
switchover
sequence
SD
SD
V/F control, advanced magnetic flux vector control
Realsensorless vector control, vector control
V/F control, advanced magnetic flux vector control
Realsensorless vector control
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.
*
*
Power supply
(R/L1, S/L2,
T/L3)
Motor speed N
(r/min)
Inverter output
frequency f(Hz)
output voltage
E(V)
Instaneous (power failure) time
Coasting
time (Pr.57)
Speed
detection
time
+
Acceleration time
at a restart
(Pr.611 setting)
* The output shut off timing differs
according to the load condition.
Instantaneous (power failure) time
Coasting time
Pr. 57 setting
Restart cushion
time
Pr. 58 setting
Power supply
(R/L1,S/L2,T/L3)
Motor speed N
(r/min)
Inverter
output frequency
f (Hz)
Inverter
output voltage
E (V)
* The output shut off timing differs according
to the load condition.
*
Coasting time
Pr.57 setting
*
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)
* The output shut off timing differs
according to the load condition.
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