Automatic Restart After Instantaneous Power Failure / Flying Start With An Induction Motor - Mitsubishi Electric 800 Series Instruction Manual

14.7
Automatic restart after instantaneous power failure
/ flying start with an induction motor
V/F V/F V/F Magnetic flux Magnetic flux Magnetic flux Sensorless Sensorless Sensorless
The inverter can be restarted without stopping the motor operation in the following situations:
• When an instantaneous power failure occurs during inverter running
• When the motor is coasting at start
Pr. Name
Automatic restart after
162
instantaneous power
A700
failure selection
Rotation direction
299
detection selection at
A701
restarting
57
Restart coasting time
A702
58
Restart cushion time
A703
165 Stall prevention operation
A710 level for restart
611 Acceleration time at a
F003 restart
*1 The coasting time when Pr.57 = "0" is as shown below. (When Pr.162 and Pr.570 are set to the initial value.)
0.5 s for the FR-E860-0027(1.5K) or lower.
1 s for the FR-E820-0080(1.5K) or lower, FR-E840-0040(1.5K) or lower, and FR-E860-0040(2.2K) to FR-E860-0120(7.5K)
2 s for the FR-E820-0110(2.2K) to FR-E820-0330(7.5K) and FR-E840-0060(2.2K) to FR-E840-0170(7.5K)
• To operate the inverter with the automatic restart after instantaneous power failure function enabled, check the following
points.
• Set Pr.57 Restart coasting time = "0".
 Setting for the automatic restart after instantaneous power failure
operation (Pr.162)
• The Pr.162 settings and the instantaneous power failure automatic restart operation under each operation mode are as
shown in the following table.
Pr.162 setting Restart operation
0 (initial value) At first start
1 At first start
10 At every start
11 At every start
 Restart operation with frequency search (Pr.162 ="0 or 10", Pr.299)
• When Pr.162 = "0 (initial value) or 10", the motor speed is detected at a power restoration so that the motor can re-start
smoothly.
Initial Setting
value range
0 Frequency search only performed at the first start
1 Reduced voltage start only at the first start (no frequency search)
0
10 Frequency search at every start
11 Reduced voltage start at every start (no frequency search)
0 Rotation direction detection disabled
1 Rotation direction detection enabled
When Pr.78 Reverse rotation prevention selection = "0", with rotation
0
direction detection
9999
When Pr.78 Reverse rotation prevention selection = "1 or 2", without
rotation direction detection
0
Coasting time differs according to the inverter capacity.
Set the time delay for the inverter to perform a restart after restoring power
9999
0.1 to 30 s
due to an instantaneous power failure.
9999 No restart
1 s 0 to 60 s Set the voltage cushion time for restart.
Set the stall prevention level at restart operation on the assumption that the
150% 0% to 400%
inverter rated current is 100%.
Set the acceleration time to reach Pr.20 Acceleration/deceleration
0 to 3600 s
reference frequency at restart.
9999
Standard acceleration time (for example, Pr.7) is applied as the acceleration
9999
time at restart.
V/F control,
Advanced magnetic flux vector control
Frequency search Frequency search
Reduced voltage start Reduced voltage start
Frequency search Frequency search
Reduced voltage start Reduced voltage start

14.7 Automatic restart after instantaneous power failure / flying start with an induction motor

Description
*1
Real sensorless vector control
Frequency search
14. (A) Application Parameters
11
12
13
14
15
16
17
18
19
20
351