Mitsubishi Electric FR-E800, Instruction Manual

Page: 404 / 484

11
12
13
14
15
16
17
18
19
20
403
15. (A) Application Parameters
15.7 Automatic restart after instantaneous power failure / flying start with an induction motor
15.7
Automatic restart after instantaneous power failure
/ flying start with an induction motor
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
*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, FR-E860-0040(2.2K) or higher, and FR-E820S-0080(1.5K) or lower.
2 s for the FR-E820-0110(2.2K) or higher, FR-E840-0060(2.2K) or higher, and FR-E820S-0110(2.2K).
• 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. Name
Initial
value Setting
range
Description
162
A700
Automatic restart after
instantaneous power
failure selection
0
0 Frequency search only performed at the first start
1
Reduced voltage start only at the first start (no frequency search) or encoder
detection frequency search
10 Frequency search at every start
11
Reduced voltage start at every start (no frequency search) or encoder
detection frequency search
299
A701
Rotation direction
detection selection at
restarting
0
0 Rotation direction detection disabled
1 Rotation direction detection enabled
9999
When Pr.78 Reverse rotation prevention selection = "0", with rotation
direction detection
When
Pr.78 Reverse rotation prevention selection = "1 or 2", without
rotation direction detection
57
A702
Restart coasting time 9999
0
Coasting time differs according to the inverter capacity.
*1
0.1 to 30 s
Set the time delay for the inverter to perform a restart after restoring power
due to an instantaneous power failure.
9999 No restart
58
A703
Restart cushion time 1 s 0 to 60 s Set the voltage cushion time for restart.
165
A710 Stall prevention operation
level for restart
150% 0% to 400%
Set the stall prevention level at restart operation on the assumption that the
inverter rated current is 100%.
611
F003 Acceleration time at a
restart
9999
0 to 3600 s
Set the acceleration time to reach Pr.20 Acceleration/deceleration
reference frequency at restart.
9999
Standard acceleration time (for example, Pr.7 ) is applied as the acceleration
time at restart.
Pr.162 setting
Restart
operation
V/F control,
Advanced magnetic flux vector control
Real sensorless
vector control
Vector control
Without encoder With encoder
0 (initial value) At first start Frequency search Frequency search
Frequency search
Encoder detection
frequency search
1 At first start Reduced voltage start
Encoder detection
frequency search
10 At every start Frequency search Frequency search
11 At every start Reduced voltage start
Encoder detection
frequency search
V/F V/F V/F Magnetic flux Magnetic flux Magnetic flux Sensorless Sensorless Sensorless Vector Vector Vector