Operation Selection At Power Failure And Instantaneous Power Failure; Automatic Restart After Instantaneous Power Failure/Flying Start Under General-Purpose Motor; Control (Pr. 57, Pr. 58, Pr. 162 To Pr. 165, Pr. 299, Pr. 611) <V/F><S Mfvc; Automatic Restart After Instantaneous Power Failure/Flying Start Under General-Purpose Motor Control (Pr. 57, Pr. 58, Pr. 162 To Pr. 165, Pr. 299, Pr. 611) <V/F><S Mfvc - Mitsubishi Electric FR-F720P-0.75K to 110K Instruction Manual

Operation selection at power failure and
instantaneous power failure
4.13 Operation selection at power failure and instantaneous
power failure
Purpose
At instantaneous power failure
occurrence, restart inverter without
stopping motor (general-purpose
motor control)
At instantaneous power failure
occurrence, restart inverter without
stopping motor (IPM motor control)
When undervoltage or a power
failure occurs, the inverter can be
decelerated to a stop.
4.13.1 Automatic restart after instantaneous power failure/flying start under general-
purpose motor control (Pr. 57, Pr. 58, Pr. 162 to Pr. 165, Pr. 299, Pr. 611)
S S S
V/F V/F V/F
MFVC MFVC MFVC
You can restart the inverter without stopping the motor in the following cases.
⋅ when bypass operation is switched to inverter operation
⋅ when power comes back ON after an instantaneous power failure
⋅ when motor is coasting at start
Parameter
Name
Number
Restart coasting
57
time
Restart cushion
58
time
Automatic
restart after
162 instantaneous
power failure
selection
First cushion
163
time for restart
First cushion
164 voltage for
restart
Stall prevention
165 operation level
for restart
Rotation
direction
299 detection
selection at
restarting
Acceleration
611
time at a restart
The above parameters can be set when Pr. 160 User group read selection = "0". (Refer to page 201)
162
Automatic restart operation
after instantaneous power
failure / flying start
Automatic restart operation
after instantaneous power
failure / flying start
Power failure-time
deceleration-to-stop
function
< V / F > < S M F V C >
Initial Value Setting Range
9999
55K or lower
75K or
higher
1s
0
0s
0%
120%
9999
55K or lower 5s
0 to 3600s, 9999
75K or
15s
higher
Parameter that must be Set
Pr. 57, Pr. 58, Pr. 162 to Pr. 165,
Pr. 299, Pr. 611
Pr. 57, Pr. 162, Pr. 611
Pr. 261 to Pr. 266
lower
1.5K or
2.2K to 7.5K............................................ 1s
0
11K to 55K ............................................. 3.0s
75K or higher .......................................... 5.0s
The above times are coasting time.
0.1 to
5s
Set the waiting time for inverter-triggered restart
after an instantaneous power failure.
0.1 to
30s
9999 No restart
0 to 60s Set a voltage starting time at restart.
0 With frequency search
Without frequency search (Reduced voltage
1
system)
10 Frequency search at every start
11 Reduced voltage system at every start
0 to 20s
Set a voltage starting time at restart.
Consider using these parameters according to the
load (moment of inertia, torque) magnitude.
0 to 100%
Considers the rated inverter current as 100% and
0 to 150% set the stall prevention operation level during
restart operation.
0 Without rotation direction detection
1 With rotation direction detection
When Pr. 78 = "0", the rotation direction is detected.
9999 When Pr. 78 = "1","2", the rotation direction is not
detected.
Set the acceleration time to reach
Acceleration/deceleration reference frequency at a
restart.
Acceleration time for restart is the normal acceleration
time (e.g. Pr. 7) when "9999" is set.
Refer to Page
162
166
169
Description
......................................... 0.5s
Pr. 20